Climate/Hydrology

Climate/Hydrology

AWE01 Meteorological data from the konza prairie headquarters weather station

Abstract: 

The following weather data are included in this data set: hourly (record type 1): mean temperature, mean relative humidity, mean wind speed, mean wind direction, mean solar radiation, soil temperature, max wind speed; daily (record type 2): maximum air temperature, minimum air temperature, mean air temperature, mean relative humidity, total solar radiation, total precipitation, maximum soil temperature, minimum soil temperature, mean soil temperature, average wind speed. These data are collectecd by a micrologger at headquarters on Konza Prairie.

Data set ID: 

14

Core Areas: 

Short name: 

AWE01

Purpose: 

Monitor meteorological parameters in tallgrass prairie on a long term basis.

Methods: 

Location of Sampling Stations: Headquarters weather station (HQC).

Frequency of Sampling: Continuous sampling at headquarters weather station.

Variable Measured:

  1. Air temperature at 2 m (⁰C)
  2. Relative humidity at 2 m (%)
  3. Solar radiation down (0.3-3.0 μm, Wm-2)
  4.  Wind speed at 3 m (ms-1)
  5. Wind direction at 3 m (degrees)
  6. Precipitation (mm)
  7. Soil temperature at 25 cm (⁰C)

Methods:

A Campbell Scientific (CR1000) data logger monitors air temperature, relative humidity, solar radiation, wind speed, soil temperature, and wind direction. Parameters are sampled once every 10 seconds. A microprocessor in the CR1000 manipulates the raw data and outputs the average air temperature, soil temperature, relative humidity, wind speed, solar radiation, and wind direction on 5 minute, hourly, and daily intervals. A separate Campbell Scientific CR800 data logger collects and stores precipitation data from an Ott Pluvio2 rainguage. The CR1000 data is accessed every 5 minutes via wireless internet, and the CR800 is accessed every 15 minutes. SAS software is used to format and output data to AWE011 (hourly) and AWE012 (daily) final storage locations.
Missing data are signified with a blank or '.'

Routine Maintenance: Weather station bi-monthly checks include:

  1. Pyranometer check for level, dust accumulation, or other obstruction
  2. Relative humidity dust shield check
  3. Bearing check on anemometer and wind direction sensor

Biyearly maintenance includes:

  1. Calibration of li200x pyranometer
  2. Replace bearings and reed switch in anemometer and bearings in wind direction sensor.

Summary of All Changes:

  1. Program execution interval was changed from 60 seconds to 10 on 7/17/2000. This change could significantly influence values reported for max wind speed. Caution should be used when comparing max wind speeds across this date.
  2. Hourly precipitation not precise and removed after 1/1/2000. All AWE01 ppt data before 3/19/2010 was collected via tipping bucket. APT01 data should be used for more accurate precipitation values.
  3. Soil Temperature data collection began in June 1992, but data are unavailable from 2001 to August 12, 2008 and December 7, 2009 to May 21, 2010.
  4. Solar radiation variables were recalculated in March 2023 in order to standardize units that had been inconsistent across years.

For additional metadata information see: http://lter.konza.ksu.edu/sites/default/files/DC.pdf

For additional methods information see: http://lter.konza.ksu.edu/sites/default/files/MM.pdf

Data sources: 

Instrumentation: 

Campbell LI200X pyranometer; Met One 024 wind direction sensor; Met One 014 wind speed sensor; Campbell HMP35C temperature and rh probe; Campbell 107 temperature probe.

Maintenance: 

ongoing

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