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Arctic LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Older Metadata: Attribute table not in XML (EML) file

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:1999dlmnth
Dataset Title:Arctic LTER 1999: Hourly data from the Toolik Moist Non-acidic Tussock Experimental plots (MNT).
Investigator 1: 
First Name:Sarah
Last Name:Hobbie
Address line 1:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:JIM LAUNDRE
Keywords:weather, air temperature, relative humidity, soil temperature
Abstract: Hourly data from the Toolik Moist Non-acidic Tussock Experimental plots (MNT). In 1999 a Campbell CR10x data logger was installed in block 2 of the experimental plots. The plots are located on a hillside near Toolik Lake (68 38' N, 149 36'W). Sensors were placed in control, fertilized, greenhouse and greenhouse fertilized sites.
Contact: Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Email: arc_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File Name 1999dlmnth
Beginning Date 5/1/1999
End Date 9/1/1999
Number of Data Records
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: For Archival Use: DATE RECEIVED: 3May2000, Aug2000 DATA FILE ENTERED BY: J.Laundre DATA FILE VALIDATION: 3May2000 NAME: JL DATE:
RESEARCH LOCATION:
Geographic Description Toolik Lake Field Station (68 38' N, 149 36'W), LTER Moist Non-acidic tussock site on hill south of Toolik Lake, North Slope of Alaska.
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude
Longitude
TAXONOMIC COVERAGE:
Organisms studied
Methods:

A Campbell CR10x data logger, in the LTER Toolik Moist Non-acidic Tussock Experimental plots (block 2), is used to monitor weather and soil temperatures.
Sensors in the control and greenhouses plots include: air temperature and relative humidity. These sensors are read every minute and averaged or totaled every hour.
Two profiles of soil temperature are measured per treatment plot with copper/constantan thermocouple wires (TC) installed at depths of 0,10, 20, and 40 cm in inter-tussock areas. The following label codes are used: CT = control, GH = greenhouses, NP = fertilized, GHF= greenhouse fertilized, plus a 1 or a 2 for the profile number. All soil sensors are read every 15 minutes and averaged every 3 hours.
Hourly, three hourly and daily summaries are in files yyDLMNTH.DAT, yyDLMNTO.DAT, and yDLMNTD.DAT respectively, where yy is the year in which the data are collected. The original data are in file yyDLMNTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.
Note: The covers on greenhouses are removed every fall and reinstalled every spring.

Notes: Missing values are indicated by #N/A.
Greenhouse air sensor was not added until Jun15,2000
Averaged temperatures from 348 2400 and 352 1200 to replace the temperatures recorded when the air temperature was below -36. With such low temperatures the error in the reference temperature is enough to cause the soil TCs to seem warmer.

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

Sampling Description.

None

Data Table

Variable    Variable description.    Precision/Units
YEAR:         Year                           YYYY
DATE:        Date                            DD-MMM-YYYY
MONTH:       Month
DAYS:        Julian plus fraction of day
ID:          Program step that output the data
JULIAN:      Julian Date                      ddd
HOUR:        Time -Alaska standard time       2400
CT Air Temp: Control temp at 3 meters         Celsius
GH Air Temp: Greenhouse temp                  Celsius
CT RH:       Control Relative Humidity at 3 meters %
GH RH:       Greenhouse Relative Humidity     %
VAPOR PRES 3M:  Vapor Pressure at 3 meters     millibars
COMMENTS:    Comments about individual datum points.
(12) CALCULATIONS
Variable        Formula
DAYS:  JULIAN + (HOUR/2400)
VAPOR PRESS 3M:  If Air Temp > 0 then  (RH /100) * 6.1121 *
exp(17.368 * AIR TEMP /(238.88 + AIR TEMP ))
If Air Temp < 0 then (RH /100) * 6.1121 *
exp(17.966 * AIR TEMP /(238.88 + AIR TEMP )) (Buck 1981).

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.