Hourly weather data from Toolik Field Station, ARC LTER, Alaska for 2000.

Abstract: 

Hourly weather data from the Arctic Tundra LTER site at Toolik Lake. The following parameters are measured every minute and averaged or totaled every hour: air temperature and relative humidity at 1 and 5 meters, wind speed at 1 and 5 meters, wind direction at 5 meters, global solar radiation, photosynthetically active radiation, barometric pressure, and unfrozen precipitation.

Project Keywords: 

Data set ID: 

1491

EML revision ID: 

1
Published on EDI/LTER Data Portal

Citation: 

Shaver, G. 2002. Hourly weather data from Toolik Field Station, ARC LTER, Alaska for 2000. Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/cea07ddca4b79139ea1e2c6f049b2b4f
People

Owner/Creator: 

Contact: 

Additional People: 

Associated Researcher
Dates

Date Range: 

Monday, May 1, 2000 to Friday, September 1, 2000

Publication Date: 

2002

Methods: 

Weather data has been collected at Toolik Lake by a Campbell 21x datalogger since June 1988. Sensors that are measured every minute and averaged or totaled every hour include: air temperature and relative humidity at 1 and 5 meters, wind speed at 1 and 5 meters, wind direction at 5 meters, global solar radiation, photosynthetically active radiation, barometric pressure, and unfrozen precipitation. Sensors measured every 10 minutes and averaged every three hours include, soil temperatures, lake temperature, lake depth, and evaporation pan depth and pan water temperature. Net radiation and pan evaporation are only measured during the summer months. The hourly data are in the file 00DLTLH.DAT, the three hourly data are in 00DLTLO.DAT, and daily summaries are in 00DLTLD.DAT. A second Campbell 21x datalogger about 700 meters from the main weather station logs air and soil temperatures and photosynthetically active radiation in the experimental treatment plots. Treatments include greenhouse, shading, and fertilization. In the control plot wind speed and direction, global solar radiation and unfrozen precipitation are also measured. This station is also used as a backup to the main weather station. The full description of the sensors and site is in file SENSORS.DOC. The original data is in file 00DLTDAT.ZIP, which is archived at The Marine Biological Lab, Woods Hole, MA.

Notes: Wind Speed less than .447 is considered calm. Lake quantum stopped working in winter 1991 and was reinstalled just for the summer of 1998,1999. In August the Lake quantum sensor was not cleaned. Therefore the values are low. Quantum has an offset of -1.4 to -2.7. The data is not corrected. For the global solar radiation and photosynthetically active radiation sensors no attempt is made to correct for frost or snow on the sensors during the winter months. Therefore winter radiation data should be view as suspect and used only qualitatively. Barometric pressure sensor was erratic for a few days in January for unknown reasons. Values were corrected. It was replaced 16Aug99. I August 1998 the tipping rain gage was fitted with a Campbell CS705 adapter for measuring snow. A Wyoming wind shield was build for the precipitation gage 30Aug99. See additional notes under Comments variable. Battery lost connection with logger and no data was collected from 24Nov 2000 to June 2001; The StowAway sensor was used to estimate the 1 meter air temperature and a regression bewtween 1 m and 5m to estimate the 5 meter air temp. Where StowAway was missing or temperatures dropped below -37.2 the Wet Sedge air temperatur was used.

Reference Citations: Buck, A.L.. 1981 New equations for computing
vapor pressure and enhancement factor. Journal of Applied Meteorology
20:1527-1532.

Sampling Description.

DAYS : JULIAN + (HOUR/2400)
VAPOR PRESS 5M:
If Air Temp > 0 then (RH 5M/100) * 6.1121 * exp(17.368 * AIR TEMP 5M/(238.88 + AIR TEMP 5M))
If Air Temp < 0 then (RH 5M/100) * 6.1121 * exp(17.966 * AIR TEMP 5M/(238.88 + AIR TEMP 5M))
(Buck 1981).
TOTAL J CM2 HR: PYRANOMETER * 0.3600 jcm2 * 1000 Watt/Kwatt

Version Changes: 

Log of changes:

Fall 2001 Added the winter data and estimated the missing data. JL.

For Archival Use:

DATE RECEIVED: 3May2000 -24Aug2000
DATA FILE ENTERED BY: Jim Laundre
DATA FILE VALIDATION:
NAME: Jim Laundre
DATE:25Aug2000
Version 3: Metadata updated to newer form (with sites sheet). Units updated to current standards. Discrepancy with variable names fixed. CH April 2013.
Version 4: Corrected Distrubution URL. It had xlsfiles in the path. Jim L 19Jun14
Version 5: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015

Sites sampled.

Download a comma delimited (csv) or Excel file (includes metadata and data sheets).

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy

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File 2000dltlh.csv

Hourly weather data... File Details

Office spreadsheet icon 2000dltlh.xls

Excel file with... File Details