MS036: Cold air drainage transect studies at the Andrews Experimental Forest, 2002 to Present

Citation

Daly, C. 2023. Cold air drainage transect studies at the Andrews Experimental Forest, 2002 to Present Long-Term Ecological Research Andrews Forest LTER Site. [Database]. Available: https://andrewsforest-stage.forestry.oregonstate.edu/data/fsdb-data-catalog/MS036 Accessed 2026-05-10.

Abstract

Temperature data are being collected to investigate the effects of elevation and local topographic position on the patterns of cold air drainage and pooling in the HJ Andrews Forest, and how they vary with synoptic weather patterns. The main focus of the study is cold air drainage in the Lookout Creek area, but others sites have been added to sample temperature signatures at other locations of the forest with topographic positions that need to be better understood. Here, quality controlled 15-minute raw data and aggregated daily minimum and maximum temperatures are available from several stations along 4 separate transects or clusters with some additional single sensors also included. Several of the quality flags indicate that the data failed the test and should not be used in analysis.

Coverage

Temporal coverage: 2001-01-12 to 2022-10-11

Geographic coverage: HJ Andrews Experimental Forest

Spatial coverage:

Loading map…

Bounds: W -122.22055560, E -122.12083330, N 44.28138889, S 44.20344500

Purpose

These data are being used to inform methods for downscaling regional climate maps using PRISM (http://prism.oregonstate.edu/). Specifically, data from these transects reveal patterns of cold air drainage and pooling in mountain valleys, and their relationships with regional weather conditions, topographic position, and the spatial scale of the valleys.

Project

Title: Long-Term Ecological Research

Personnel

Posy Elizabeth Busby - Principal Investigator
Assistant Professor OSU Botany & Plant Pathology

Email: busbyp@science.oregonstate.edu, posybusby@gmail.com

URL: http://bpp.oregonstate.edu/content/posy-busby

ORCID: http://orcid.org/0000-0002-2837-9820
Matthew G Betts - Principal Investigator
Department of Forest Ecosystems and Society; 201E Richardson Hall; College of Forestry; Oregon State University, Corvallis, OR, 97331

Phone: (541) 737-3841

Email: matt.betts@oregonstate.edu

URL: http://www.fsl.orst.edu/flel/index.htm

ORCID: http://orcid.org/0000-0002-7100-2551
Brooke E. Penaluna - Principal Investigator
Email: brooke.penaluna@usda.gov, Brooke.Penaluna@oregonstate.edu

URL: https://www.fs.fed.us/pnw/lwm/aem/people/penaluna.html

ORCID: http://orcid.org/0000-0001-7215-770X
Catalina Segura - Principal Investigator
Assistant Professor; Department of Forest Engineering, Resources, and Management; Oregon State University, Corvallis, OR, 97331

Phone: 541-737-6568

Email: catalina.segura@oregonstate.edu

URL: http://ferm.forestry.oregonstate.edu/facstaff/segura-catalina

ORCID: http://orcid.org/0000-0002-0924-1172
David Bell - Principal Investigator
Email: david.bell@usda.gov, david.bell@oregonstate.edu

URL: https://lemma.forestry.oregonstate.edu/about/david-bell

ORCID: http://orcid.org/0000-0002-2673-5836

Abstract

The H.J. Andrews Experimental Forest is a living laboratory that provides unparalleled opportunities for the study of forest and stream ecosystems in the central Cascade Range of Oregon. Since 1980, as a part of the National Science Foundation Long Term Ecological Research (NSF-LTER) program, the Andrews Experimental Forest has become a leader in the analysis of forest and stream ecosystem dynamics.
Long-term field experiments and measurement programs have focused on climate dynamics, streamflow, water quality, and vegetation succession. Currently researchers are working to develop concepts and tools needed to predict effects of natural disturbance, land use, and climate change on ecosystem structure, function, and species composition.
The Andrews Experimental Forest is administered cooperatively by the USDA Forest Service Pacific Northwest Research Station, Oregon State University and the Willamette National Forest. Funding for the research program comes from the National Science Foundation (NSF), US Forest Service Pacific Northwest Research Station, Oregon State University, and other sources.

Funding

Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University. National Science Foundation: DEB2025755

Awards

LTER: Long-Term Ecological Research at the H.J. Andrews Experimental Forest (LTER8)
Award Number: DEB2025755

Funder: National Science Foundation

Funder Identifier: https://ror.org/021nxhr62

URL: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2025755

Study Area Description

Long-Term Ecological Research
The Andrews Forest is situated in the western Cascade Range of Oregon, and covers the entire 15,800-acre (6400-ha) drainage basin of Lookout Creek. Elevation ranges from 1350 to 5340 feet (410 to 1630 m). Broadly representative of the rugged mountainous landscape of the Pacific Northwest, the Andrews Forest contains excellent examples of the region's conifer forests and associated wildlife and stream ecosystems. These forests are among the tallest and most productive in the world, with tree heights of often greater than 250 ft (75 m). Streams are steep, cold and clean, providing habitat for numerous aquatic organisms.

Associated Party

Christopher Daly
Role: Principal Investigator

PRISM Group;Northwest Alliance for Computational Science and Engineering, 2000 Kelley Engineering Center;Oregon State University, Corvallis, OR, 97331, USA

Phone: (541) 737-2531

Email: daly@nacse.org

URL: http://prism.oregonstate.edu
Christopher Daly
Role: Creator

PRISM Group;Northwest Alliance for Computational Science and Engineering, 2000 Kelley Engineering Center;Oregon State University, Corvallis, OR, 97331, USA

Phone: (541) 737-2531

Email: daly@nacse.org

URL: http://prism.oregonstate.edu
John Moreau
Role: Former Investigator

Blue River, OR, 97413, USA

Email: john.moreau@oregonstate.edu
Adam M Kennedy
Role: Other Researcher

1055 Clinton Drive, Eugene, OR, 97401, US

Phone: 541-822-6302

Email: adam.kennedy@oregonstate.edu, kennaster@gmail.com

URL: https://directory.forestry.oregonstate.edu/people/kennedy-adam
Joseph I. Smith
Role: Other Researcher
Joseph I. Smith
Role: Method Contact
Greg M Cohn
Role: Other Researcher

USFS Rd 15-130-132, Blue River, OR, 97413

Phone: 541-822-6305

Email: cohng@oregonstate.edu
David Rupp
Role: Other Researcher

Earth, Ocean & Atmo Sci

Email: drupp@coas.oregonstate.edu

Contact

Information Manager
Andrews Forest LTER Program, US Forest Service Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR, 97331

Email: hjaweb@lists.oregonstate.edu

URL: http://andrewsforest.oregonstate.edu/

Publisher

Andrews Forest LTER Site
Role: Publisher

Forest Ecosystems and Society Department in Forestry, Oregon State University, 201K Richardson Hall, Corvallis, OR, 97331-5752

Phone: (541) 737-8480

Email: lterweb@lists.oregonstate.edu

URL: http://andrewsforest.oregonstate.edu/

Study Description

Temperature data are being collected to investigate the effects of elevation and local topographic position on the patterns of cold air drainage and pooling in the HJ Andrews Forest, and how they vary with synoptic weather patterns. The main focus of the study is cold air drainage in the Lookout Creek area, but others sites have been added to sample temperature signatures at other locations of the forest with topographic positions that need to be better understood. Here, quality controlled 15-minute raw data and aggregated daily minimum and maximum temperatures are available from several stations along 4 separate transects or clusters with some additional single sensors also included. Several of the quality flags indicate that the data failed the test and should not be used in analysis. These data are being used to inform methods for downscaling regional climate maps using PRISM (http://prism.oregonstate.edu/). Specifically, data from these transects reveal patterns of cold air drainage and pooling in mountain valleys, and their relationships with regional weather conditions, topographic position, and the spatial scale of the valleys. Field Methods - MS036

Purpose: These data are being used to inform methods for downscaling regional climate maps using PRISM (http://prism.oregonstate.edu/). Specifically, data from these transects reveal patterns of cold air drainage and pooling in mountain valleys, and their relationships with regional weather conditions, topographic position, and the spatial scale of the valleys.

Methods

Method Steps

Field Methods - MS036

Data are sampled every 15 minutes with Hobo portable sensors mounted on rebar approximately 1.5 m above ground. Radiation shields are the “HJA short” type, which is made from PVC tubing, cut lengthwise and mounted above the sensor; sensors are open to the ground. Most sensors are located under dense forest canopy, with little solar radiation exposure. Many sensors also record illumination, which is useful in quantifying light exposure. Data are downloaded from the Hobo two times per year.

Processing Procedures - MS036

Daily maximum and minimum temperature values for entity 1 are generated from the raw 15-min HOBO data files. The data are subjected to a series of QC checks including range, rate of change, sufficient number of observations, standard deviation, and multi-day persistence checks. For range checks, the values are compared to the state monthly record. If a value falls outside of 2.8 degree C buffer, the value is removed from further consideration. For the rate of change check, if the current temperature is not missing and within one hour of the previous valid temperature, the difference between the temperatures is calculated. If the temperature difference exceeds 10 degrees C, the current temperature is removed from further consideration. At this point, the maximum and minimum of all non-missing temperatures for the day become the daily maximum and minimum temperatures. To check if there were a sufficient number of observations for the day, if there were valid observations in less than 18 of the 24 hours in the day, the daily maximum and minimum temperatures are flagged as an insufficient number of hourly observations to generate a valid daily observation. The standard deviation of all observations for the day is calculated and if the standard deviation is less than 0.1 degrees C, the daily observations are flagged as having too little variation over the day to be considered valid. Finally, the daily observations are checked for multi-day persistence. The difference between successive daily observations is calculated and if the difference is 0.4 degrees C or less for more than 10 successive observations, all observations in the sequence (not already flagged by previous checks) are flagged as being too many days with the same value. There can be no more than two missing days between successive observations before the sequence is reset. The 0.4 degree C threshold was chosen to identify occurrences of drift in automated sensors. Maximum and minimum temperatures are tested for multi-day persistence independently to account for issues that affect only one end of the temperature range, or where maximum and minimum temperatures are measured independently.
The 15-minute QC'd data in entity 2 was a one-time process to create this dataset for publication and is separate from the processing of data in entity 1. The raw 15-minute data are first run through an R program that concatenates the separate files from the HOBO datalogger into a single, uniformly formatted, time series with time gaps filled with blank records. The concatenated data are then run through a Python program (hja_hobo_clean) created for the purpose of data quality assurance and quality control of HOBO temperature sensor data collected at the Andrews Forest. The program flags data based on user-specified parameters. The program can also remove flagged data (clean) and fill in missing data with regressed data from other sites, but these procedures where not used for these data. Visual inspection was also done of the data from some sites - those on the Lower Lookout (LL) and Upper Lookout (UL) transects only. Visual inspection consisted of comparing all sensors within a transect to identify suspect data (e.g., a sensor whose reading were clearly inconsistent with others and with its own previous patterns). For all sites, field notes were also used to identify data when a sensor may have been on ground and/or its radiation shield was broken. Lastly, data are run through a second R program that flags data based on results from the visual inspection and field notes.

Quality Assurance - MS036

The flags set for daily minimum and maximum data are single-station QC (SSQC) flags. Spatial consistency QC (SPQC) tests have not been applied to these data. If a daily value fails an SSQC test, the value is retained, but it is not passed to PRISM for use in modeling, as it has been determined that the value does not meet minimum requirements for inclusion. Users of these data should be aware of these short-comings with the flagged data.

Sampling

Study Extent

Sites are selected along transects to represent elevational change moving in lateral directions away from a stream, or are clustered above or below a spring or depression. Two single points are selected at high elevations to represent one low and one high topographic position.
Sampling frequency: 15-minute

Sampling Description

Observed temperatures on “cold air” transects at 34 locations within the HJ Andrews Forest. The lower Lookout Creek transect (10 stations) is located just to the west of the concrete bridge, and intersects RS10. The upper Lookout Creek transect (11 stations) extends north from the north slope of Lookout Mountain, across Lookout Creek, and ends below the CENMET benchmark station. East of the upper transect, there is a short, 4-station transect across Cold Creek, a tributary of Lookout Creek. North of the upper transect, a 5-station cluster samples locations near a stream channel, above and below a spring. Single sensors are located downslope from the Roads End rain gauge near the southern border of the forest (high elevation, but locally low topographic position), and near the summit of Carpenter Mountain, on the northern border of the forest (high elevation, high topographic position, exposed to the free atmosphere). Two sensors will located temporarily in and above a sink northeast of the CENMET benchmark station. The upper and lower Lookout Creek transects were established in 2002, with others placed at later dates.

Spatial Sampling Units

Software

No software entries listed in this EML file.

Keywords

LTER controlled vocabulary: meteorology (theme), climatology (theme), climate change (theme), air temperature (theme), topography (theme), forest ecosystems (theme)
Andrews Experimental Forest site thesaurus: Long-Term Ecological Research (LTER) (theme)

Taxonomic Hierarchy

No taxonomic hierarchy listed in this EML file.

Data Entities

#	Entity	Metadata	Data
1	MS03601 Air Temperature (Daily minimum and maximum) Computed from fine temporal resolutions sensors.	METADATA	DATA
2	MS03602 Fine temporal resolution (15-minute) air temperature and light intensity data Raw data that has been flagged with the hja_hobo_clean Python program and, for a subset of sites, by visual inspection	METADATA	DATA

Metadata

MS03601 - Air Temperature (Daily minimum and maximum)

Object name: MS03601_v4.csv

Records: 195350

Attributes: 9

Temporal coverage: 2001-01-12 to 2022-10-11

File size: 8624537 byte

Checksum (MD5): 749e7b37880492ded197f331d73f6950

Format: headers=1, recordDelimiter=\r\n, fieldDelimiter=,, quoteCharacter=", orientation=column

Constraints (2)

primaryKey: PRIMARY
MS03601.SITECODE, MS03601.DATE
notNullConstraint: NOTNULL
MS03601.DBCODE, MS03601.ENTITY, MS03601.SITECODE, MS03601.DATE, MS03601.AIRTEMP_MAX_QC, MS03601.AIRTEMP_MIN_QC, MS03601.TRANSECT

Attributes (9)

DBCODE - char(5) (nominal)

ID: MS03601.DBCODE

FSDB Database Code

Type system: Microsoft SQL Server 2019

Code definitions (1)

MS036
FSDB Database Code MS036

ENTITY - numeric(2,0) (ratio)

ID: MS03601.ENTITY

Entity Number

Type system: Microsoft SQL Server 2019

Unit: number

Precision: 1.000000

Numeric domain: type=natural, min=1.0000 (exclusive=false), max=1.0000 (exclusive=false)

TRANSECT - char(2) (nominal)

ID: MS03601.TRANSECT

Transect or cluster for the given site

Type system: Microsoft SQL Server 2019

Code definitions (7)

CC
Cold Creek
DS
DS
LL
Lower Lookout Creek
MD
MD
RE
Road's End, at the end of NF-1507
UL
Upper Lookout Creek
CM
Carpenter Mountain

SITECODE - char(6) (nominal)

ID: MS03601.SITECODE

Site code for the measurement station

Type system: Microsoft SQL Server 2019

Code definitions (34)

CA501
HJA Cold Air Station #501, Lower Lookout transect, elevation 669m, north
CA502
HJA Cold Air Station #502, Lower Lookout transect, elevation 646m, north
CA503
HJA Cold Air Station #503, Lower Lookout transect, elevation,557m, north
CA504
HJA Cold Air Station #504, Lower Lookout transect, elevation, 527m, north
CA505
HJA Cold Air Station #505, Lower Lookout transect, elevation, 528m, south
CA506
HJA Cold Air Station #506, Lower Lookout transect, elevation, 577m, south
CA507
HJA Cold Air Station #507, Lower Lookout transect, elevation, 596m, south
CA508
HJA Cold Air Station #508, Lower Lookout transect, elevation, 624m, south
CA509
HJA Cold Air Station #509, Daly Spring cluster, elevation 986, above spring
CA510
HJA Cold Air Station #510, Upper Lookout transect, elevation, 903m, north
CA511
HJA Cold Air Station #511, Upper Lookout transect, elevation, 912m, north
CA512
HJA Cold Air Station #512, Upper Lookout transect, elevation, 841m, north
CA513
HJA Cold Air Station #513, Upper Lookout transect, elevation, 806m, south
CA514
HJA Cold Air Station #514, Upper Lookout transect, elevation, 813m, south
CA515
HJA Cold Air Station #515, Upper Lookout transect, elevation, 813m, south
CA516
HJA Cold Air Station #516, Upper Lookout transect, elevation, 845m, south
CA517
HJA Cold Air Station #517, Upper Lookout transect, elevation, 876m, south
CA518
HJA Cold Air Station #518, Upper Lookout transect, elevation, 900m, south
CA519A
HJA Cold Air Station #519A, Lower Lookout transect, elevation, 613m, north
CA519B
HJA Cold Air Station #519B, Upper Lookout transect, elevation, 925m, south
CA520
HJA Cold Air Station #520, Upper Lookout transect, elevation, 957m, south
CA521
HJA Cold Air Station #521, Daly Spring cluster, elevation 987, above spring
CA522
HJA Cold Air Station #522, Daly Spring cluster, elevation 980, below spring
CA523
HJA Cold Air Station #523, Daly Spring cluster, elevation 974, below spring
CA524
HJA Cold Air Station #524, Daly Spring cluster, elevation 962, below spring
CA525
HJA Cold Air Station #525, Cold Creek transect, elevation 1058, south
CA526
HJA Cold Air Station #526, Cold Creek transect, elevation 1063, south
CA527
HJA Cold Air Station #527, Cold Creek transect, elevation 1051, north
CA528
HJA Cold Air Station #528, Cold Creek transect, elevation 1064, north
CA529
HJA Cold Air Station #529, Lower Lookout transect, elevation, 756m, north
CACARP
HJA Cold Air Station on Carpenter Mountain, elevation 1616m, high topographic position
CAMDPI
HJA Cold Air Station Moreau Depression Pit, elevation 1134, in sink
CAMDRI
HJA Cold Air Station Moreau Depression Ridge, elevation 1138, above sink
CAROAD
HJA Cold Air Station at Road's End, elevation 1320m, low topographic position

DATE - datetime (dateTime)

ID: MS03601.DATE

Date of Measurement

Type system: Microsoft SQL Server 2019

Date format: YYYY-MM-DD

AIRTEMP_MAX_DAY - numeric(5,1) (interval)

ID: MS03601.AIRTEMP_MAX_DAY

Maximum air temperature for the day

Type system: Microsoft SQL Server 2019

Unit: degrees Celsius

Precision: 0.200000

Numeric domain: type=real, min=-15.6000 (exclusive=false), max=51.0000 (exclusive=false)

AIRTEMP_MAX_QC - char(1) (nominal)

ID: MS03601.AIRTEMP_MAX_QC

Maximum air temperature quality control codes

Type system: Microsoft SQL Server 2019

Code definitions (5)

code
Value passed QC test
1
No data collected - instrument failure
3
Insufficient number of hourly observations to generate a valid daily observation
8
Too little variation in hourly observations to generate a valid daily observation
9
Too many consecutive days with the same daily value

AIRTEMP_MIN_DAY - numeric(5,1) (interval)

ID: MS03601.AIRTEMP_MIN_DAY

Minimum air temperature for the day

Type system: Microsoft SQL Server 2019

Unit: degrees Celsius

Precision: 0.200000

Numeric domain: type=real, min=-25.1000 (exclusive=false), max=47.6000 (exclusive=false)

AIRTEMP_MIN_QC - char(1) (nominal)

ID: MS03601.AIRTEMP_MIN_QC

Minimum air temperature quality control codes

Type system: Microsoft SQL Server 2019

Code definitions (5)

code
Value passed quality control test
1
No data collected - instrument failure
3
Insufficient number of hourly observations to generate a valid daily observation
8
Too little variation in hourly observations to generate a valid daily observation
9
Too many consecutive days with the same daily value

MS03602 - Fine temporal resolution (15-minute) air temperature and light intensity data

Object name: MS03602_v1.txt

Records: 17464555

Attributes: 21

Temporal coverage: 2002-07-26 to 2019-07-26

File size: 1388186281 byte

Checksum (MD5): b5b9b16b8603e4080522ed5038ee45a7

Format: headers=1, recordDelimiter=\r\n, fieldDelimiter=,, quoteCharacter=", orientation=column

Constraints (2)

primaryKey: PRIMARY
MS03602.SITECODE, MS03602.DATE_TIME
notNullConstraint: NOTNULL
MS03602.SITECODE, MS03602.DATE_TIME, MS03602.QC_LEVEL, MS03602.TRANSECT, MS03602.DAYLIGHT, MS03602.TIME_GAP, MS03602.EXTREME_TEMP, MS03602.JUMP, MS03602.EXTREME_INTENSITY, MS03602.HIGH_INTENSITY, MS03602.RADIATION_BIAS_INTENSITY, MS03602.LOW_DAYLIGHT_INTENSITY, MS03602.NIGHTTIME_INTENSITY, MS03602.SNOW, MS03602.TEMP_SPIKE, MS03602.FIELD_NOTES, MS03602.VISUAL_1

Attributes (21)

DBCODE - char(5) (nominal)

ID: MS03602.DBCODE

FSDB Database Code

Type system: Microsoft SQL Server 2019

Code definitions (1)

MS036
FSDB Database Code MS036

ENTITY - numeric(2,0) (ratio)

ID: MS03602.ENTITY

Entity Number

Type system: Microsoft SQL Server 2019

Unit: number

Precision: 1.000000

Numeric domain: type=natural, min=2.0000 (exclusive=false), max=2.0000 (exclusive=false)

TRANSECT - char(2) (nominal)

ID: MS03602.TRANSECT

Transect or cluster for the given site

Type system: Microsoft SQL Server 2019

Code definitions (7)

CC
Cold Creek
DS
DS
LL
Lower Lookout Creek
MD
MD
RE
Road's End, at the end of NF-1507
UL
Upper Lookout Creek
CM
Carpenter Mountain

SITECODE - char(6) (nominal)

ID: MS03602.SITECODE

Site code for the measurement station

Type system: Microsoft SQL Server 2019

Code definitions (34)

CA501
HJA Cold Air Station #501, Lower Lookout transect, elevation 669m, north
CA502
HJA Cold Air Station #502, Lower Lookout transect, elevation 646m, north
CA503
HJA Cold Air Station #503, Lower Lookout transect, elevation,557m, north
CA504
HJA Cold Air Station #504, Lower Lookout transect, elevation, 527m, north
CA505
HJA Cold Air Station #505, Lower Lookout transect, elevation, 528m, south
CA506
HJA Cold Air Station #506, Lower Lookout transect, elevation, 577m, south
CA507
HJA Cold Air Station #507, Lower Lookout transect, elevation, 596m, south
CA508
HJA Cold Air Station #508, Lower Lookout transect, elevation, 624m, south
CA509
HJA Cold Air Station #509, Daly Spring cluster, elevation 986, above spring
CA510
HJA Cold Air Station #510, Upper Lookout transect, elevation, 903m, north
CA511
HJA Cold Air Station #511, Upper Lookout transect, elevation, 912m, north
CA512
HJA Cold Air Station #512, Upper Lookout transect, elevation, 841m, north
CA513
HJA Cold Air Station #513, Upper Lookout transect, elevation, 806m, south
CA514
HJA Cold Air Station #514, Upper Lookout transect, elevation, 813m, south
CA515
HJA Cold Air Station #515, Upper Lookout transect, elevation, 813m, south
CA516
HJA Cold Air Station #516, Upper Lookout transect, elevation, 845m, south
CA517
HJA Cold Air Station #517, Upper Lookout transect, elevation, 876m, south
CA518
HJA Cold Air Station #518, Upper Lookout transect, elevation, 900m, south
CA519A
HJA Cold Air Station #519A, Lower Lookout transect, elevation, 613m, north
CA519B
HJA Cold Air Station #519B, Upper Lookout transect, elevation, 925m, south
CA520
HJA Cold Air Station #520, Upper Lookout transect, elevation, 957m, south
CA521
HJA Cold Air Station #521, Daly Spring cluster, elevation 987, above spring
CA522
HJA Cold Air Station #522, Daly Spring cluster, elevation 980, below spring
CA523
HJA Cold Air Station #523, Daly Spring cluster, elevation 974, below spring
CA524
HJA Cold Air Station #524, Daly Spring cluster, elevation 962, below spring
CA525
HJA Cold Air Station #525, Cold Creek transect, elevation 1058, south
CA526
HJA Cold Air Station #526, Cold Creek transect, elevation 1063, south
CA527
HJA Cold Air Station #527, Cold Creek transect, elevation 1051, north
CA528
HJA Cold Air Station #528, Cold Creek transect, elevation 1064, north
CA529
HJA Cold Air Station #529, Lower Lookout transect, elevation, 756m, north
CACARP
HJA Cold Air Station on Carpenter Mountain, elevation 1616m, high topographic position
CAMDPI
HJA Cold Air Station Moreau Depression Pit, elevation 1134, in sink
CAMDRI
HJA Cold Air Station Moreau Depression Ridge, elevation 1138, above sink
CAROAD
HJA Cold Air Station at Road's End, elevation 1320m, low topographic position

QC_LEVEL - char(2) (nominal)

ID: MS03602.QC_LEVEL

Quality control flag indicates level of quality checking performed

Type system: Microsoft SQL Server 2019

Code definitions (4)

1A
Data is published and unlikely to change - automated range checking and manual review has been conducted.
1D
Data is published and unlikely to change - data is derived or aggregated from published data of level 1A
2A
Data is published and unlikely to change - Level 1A data has been modified such that data gaps may be filled or problem data may be removed
2D
Data is published and unlikely to change - data is derived or aggregated from published data of level 2A

DATE_TIME - datetime (dateTime)

ID: MS03602.DATE_TIME

Date and time in Pacific Standard Time (PST) of measurement

Type system: Microsoft SQL Server 2019

Date format: YYYY-MM-DD hh:mm:ss

AIRTEMP_INST - numeric(8,3) (ratio)

ID: MS03602.AIRTEMP_INST

Instantaneous air temperature recorded on a specified interval (e.g., every 15 or 20 minutes)

Type system: Microsoft SQL Server 2019

Unit: degrees Celsius

Precision: 1

Numeric domain: type=real, min=-59.0400 (exclusive=false), max=398.6700 (exclusive=false)

INTENSITY - numeric(7,0) (ratio)

ID: MS03602.INTENSITY

Light intensity measured under the PVC shield on a specified interval (e.g., every 15 or 20 minutes)

Type system: Microsoft SQL Server 2019

Unit: lux

Precision: 1

Numeric domain: type=integer, min=0.0000 (exclusive=false), max=341690.0000 (exclusive=false)

DAYLIGHT - char(1) (nominal)

ID: MS03602.DAYLIGHT

An indication of day vs night, daylight hour based on sunrise/sunset table

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
Night
1
Day

TIME_GAP - char(1) (nominal)

ID: MS03602.TIME_GAP

Time gap flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
No time gap in data
1
Time interval between measurements is greater than the threshold (15 or 20 minutes)

EXTREME_TEMP - char(1) (nominal)

ID: MS03602.EXTREME_TEMP

Extreme temperature flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
Temperature change relative to prior reading is within prescribed range
1
Temperature change relative to prior reading is outside the possible range (greater tha 42 or less than or equal to -20 degrees C)

JUMP - char(1) (nominal)

ID: MS03602.JUMP

Temperature jump flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
Temperature change relative to prior reading is within prescribed range
1
Temperature change greater than 5 degrees C relative to prior reading

EXTREME_INTENSITY - char(1) (nominal)

ID: MS03602.EXTREME_INTENSITY

Extreme intensity flag

Type system: Microsoft SQL Server 2019

Code definitions (3)

code
Light intensity value is within the prescribed range
1
Light intensity reading is an impossible value (greater than 40,000 lux)
9
Light intensity is not measured (no sensor present)

HIGH_INTENSITY - char(1) (nominal)

ID: MS03602.HIGH_INTENSITY

High intensity flag

Type system: Microsoft SQL Server 2019

Code definitions (3)

code
Light intensity value is within the prescribed range
1
Light intensity value likely associated with greater than or equal to 3 degree C bias relative to aspirated sensor (greater than 18,000 lux)
9
Light intensity is not measured (no sensor present)

RADIATION_BIAS_INTENSITY - char(1) (nominal)

ID: MS03602.RADIATION_BIAS_INTENSITY

Radiation bias flag

Type system: Microsoft SQL Server 2019

Code definitions (3)

code
Light intensity value is within the prescribed range
1
Light intensity value likely associated with greater than or equal to 1.5 degree C bias relative to aspirated sensor (greater than 7000 lux)
9
Light intensity is not measured (no sensor present)

LOW_DAYLIGHT_INTENSITY - char(1) (nominal)

ID: MS03602.LOW_DAYLIGHT_INTENSITY

Low daylight flag

Type system: Microsoft SQL Server 2019

Code definitions (3)

code
Light intensity value is within the prescribed range
1
Light intensity reading less than or equal to 0 during daylight hours
9
Light intensity is not measured (no sensor present)

NIGHTTIME_INTENSITY - char(1) (nominal)

ID: MS03602.NIGHTTIME_INTENSITY

Nightime intensity reading flag

Type system: Microsoft SQL Server 2019

Code definitions (3)

code
Light intensity value is within the prescribed range
1
Light intensity reading greater than or equal to 0.1 lux during nighttime hours (defined as outside of daylight)
9
Light intensity is not measured (no sensor present)

SNOW - char(1) (ordinal)

ID: MS03602.SNOW

Snow flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
Snow is not affecting the temperature sensor reading
1
Temperature within plus or minus 0.7 degrees C for 2 days indicating that the sensor might be buried under snow

TEMP_SPIKE - char(1) (nominal)

ID: MS03602.TEMP_SPIKE

Temperature spike flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
Temperature change from a 7-record (centered) median is within prescribed range
1
Temperature deviates more than 7 degrees C from a 7-record (centered) median

FIELD_NOTES - char(1) (nominal)

ID: MS03602.FIELD_NOTES

Site inspection flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
No fallen or broken sensor or shield reported during site inspection
1
Sensor was on ground and/or radiation shield was broken at site inspection; all readings from day of inspection back to day of previous inspection are flagged with "1"

VISUAL_1 - char(1) (nominal)

ID: MS03602.VISUAL_1

Visual/manual QC flag

Type system: Microsoft SQL Server 2019

Code definitions (2)

code
No highly suspect reading was detected when visually compared to other sensors in the same transect. Applies only to the Lower Lookout (LL) and Upper Lookout (UL) transects
1
A highly suspect reading was detected when visually compared to other sensors in the same transect. Applies only to the Lower Lookout (LL) and Upper Lookout (UL) transects

Units


number	number	dimensionless	number	dimensionless	1	dimensionless number, i.e., ratio, count
degrees Celsius	deg c	temperature	celsiusDegree	kelvin	1	Degrees Celsius; a common unit of temperature; constantToSI=273.18
lux	lux	illuminance	lux	lux	1	lux

Related Datasets

MS045

Related Publications

No publication citations found in this EML file.

Related Files

Sunrise-sunset table
Table by day of year for sunrise and sunset times in Pacific Daylight Time

URL: https://andrewsforest.oregonstate.edu/data/studies/ms045/hja_daylength_pdt.csv
hja_hobo_clean Python program
The repository that hosts the code needed to process, flag and clean HOBO-collected data records from the H.J. Andrews Experimental Forest.

URL: https://bitbucket.org/hjandrews/hja_hobo_clean/src/master/
Python flag definitions
Table of flags used in Python code for QA/QC of Hobo temperature and light sensors in the Andrews Forest.

URL: https://andrewsforest.oregonstate.edu/data/studies/ms045/Python_flag_definitions_v2.pdf

Intellectual Rights

Data Use Agreement:

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. This Data Set is released under the Creative Commons license CC BY "Attribution" (see: https://creativecommons.org/licenses/by/4.0/). Creative Commons license CC BY - Attribution is a license that allows others to distribute, remix, tweak, and build upon your work (even commercially), as long as you are credited for the original creation. This license accommodates maximum dissemination and use of licensed materials.

It is considered professional conduct and an ethical obligation to acknowledge the work of other scientists. The Data User is asked to provide attribution of the original work if this data package is shared in whole or by individual parts or used in the derivation of other products. A recommended citation is provided for each Data Set in the Andrews LTER data catalog (see: http://andlter.forestry.oregonstate.edu/data/catalog/datacatalog.aspx). A generic citation is also provided for this Data Set on the website https://portal.edirepository.org in the summary metadata page. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed and all data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data.

General acknowledgement: Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.

Licensed

License: Creative Commons Attribution 4.0 International Public License

Identifier: CC-BY-4.0

URL: https://creativecommons.org/licenses/by/4.0/

Maintenance

Maintenance update frequency: annually

Description

An update history is logged and maintained with each new version of every dataset.

Change History

Version1 (2007-07-20)
Created study code for Cold Air Temperature Transects in SQL.
Version2 (2011-03-10)
Created entities and attributes in SQL.
Version3 (2017-06-29)
Entity 1 is established online for the first time, 2002-2016. Entity 2 15-minute data will not be prepared for online distribution. Attributes were renamed to match MS001 convention.
Version4 (2017-07-18)
Enhanced abstract, purpose and attribute "sitecode" descriptions in the metadata. Added a "transect" attribute to categorize the individual stations. Also corrects intellectual rights and adds checksum.
Version5 (2019-12-04)
Added entity 2 data which is 15 minute data run through Python QC program that flags data. From David Rupp and used in a paper. Also added new version of entity 1 which are QC'd daily max and min temperature values. All data values are flagged and no data are removed.
Version6 (2023-04-08)
Updated data in entity 1 through 9-10/2022. Data was reprocessed due to an error in the original QC code starting in 6/20/2007 for most sites, 10/26/2009 for CACARP, and 6/28/2009 for transects MD and RE. Entity 2 will not be updated as it was a one-off product.

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MS036: Cold air drainage transect studies at the Andrews Experimental Forest, 2002 to Present

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