GCIP/EOP Sub-Surface: Illinois Soil Moisture Data 1.0 General Information This data set consists of total soil moisture measured at 19 stations in the state of Illinois, USA, from 1981 to November 2001, measured with the neutron probe technique, calibrated with gravimetric observations. The data are measured for the top 10 cm of soil, and then for 20 cm layers (e.g., 10-30 cm, 30-50 cm, ...) down to a depth of 2 m. The vegetation at all stations is grass, except for one station with bare soil measurements, at the same location as a grass-covered station. The measurements are at approximately monthly intervals. 2.0 Data Contact Steven Hollinger (hollingr@uiuc.edu) 3.0 Data and Format Information 3.1 Data Source These data were retrieved from the Global Soil Moisture Data Bank (http://climate.envsci.rutgers.edu/soil_moisture/) which requests that papers written using data taken from this Data Bank should acknowledge the paper by Robock et al. (2000). The Illinois data have further information at the Global Soil Moisture Data Bank at: http://climate.envsci.rutgers.edu/soil_moisture/illinois.html The original source of the data was the Illinois State Water Survey and the data and details of the observations are described in Hollinger and Isard (1994). 3.1 Data Format for file ill_soil_moisture.txt The format is columnar ASCII. The data parameters include: Year - Year of observation MO - Month of observation (1 = January, 2 = February, etc) DY - Day of observation Sta - Station Number (see Section 3.2 for station list 0-10 - total soil moisture for top 10cm of soil 10-30 - total soil moisture for 10-30cm layer 30-50 - total soil moisture for 30-50cm layer 50-70 - total soil moisture for 50-70cm layer 70-90 - total soil moisture for 70-90cm layer 90-110 - total soil moisture for 90-110cm layer 110-130 - total soil moisture for 110-130cm layer 130-150 - total soil moisture for 130-150cm layer 150-170 - total soil moisture for 150-170cm layer 170-190 - total soil moisture for 170-190cm layer 190-200 - total soil moisture for 190-200cm layer 3.2 Station List No. Name Code Lat(°N) Lon(°W) Altitude (m) ------------------------------------------------------------- 1 Bondville BVL 40.05 88.22 213 2 Dixon Springs-Bare DXB 37.45 88.67 165 3 Brownstown BRW 38.95 88.95 177 4 Orr Center (Perry) ORR 39.80 90.83 206 5 De Kalb DEK 41.85 88.85 265 6 Monmouth MON 40.92 90.73 229 8 Peoria ICC 40.70 89.52 207 9 Springfield LLC 39.52 89.62 177 10 Belleville FRM 38.52 89.88 133 11 Carbondale SIU 37.72 89.23 137 12 Olney OLN 38.73 88.10 134 13 Freeport FRE 42.28 89.67 265 14 Rend Lake (Ina) RND 38.13 88.92 130 15 Stelle STE 40.95 88.17 213 16 Topeka MTF 40.30 89.90 152 17 Oak Run OAK 40.97 90.15 229 34 Fairfield FAI 38.38 88.38 136 81 Champaign CMI 40.08 88.23 219 82 Dixon Springs-Grass DXG 37.45 88.67 165 3.3 Data Files Included The files included in this data set are: ill_soil_moisture.txt - contains the soil moisture data fieldcap.plant_avail.txt - contains soil moisture potential plant available moisture (mm) for 11 soil layers fieldcap.total.txt - soil moisture field capacity (mm) for 11 soil layers wiltlev.txt - soil moisture wilting points (mm) for 11 soil layers 4.0 Quality Control Procedures UCAR/JOSS conducted no additional quality control on these data. 5.0 References Hollinger, Steven E., and Scott A. Isard, 1994: A soil moisture climatology of Illinois. J. Climate, 7, 822-833. Robock, Alan, Konstantin Y. Vinnikov, Govindarajalu Srinivasan, Jared K. Entin, Steven E. Hollinger, Nina A. Speranskaya, Suxia Liu, and A. Namkhai, 2000: The Global Soil Moisture Data Bank. Bull. Amer. Meteorol. Soc., 81, 1281-1299.