HR: 0830h
AN: A41C-05    [Abstracts]
TI: Evaluation of soil moisture in the FSUCLM using two Reanalyses (R2 and ERA40) and in-situ observations
AU: * boisserie, m
EM: marie@coaps.fsu.edu
AF: coaps, florida state university, tallahassee, fl 32306-2840
AU: shin, d
EM: shin@coaps.fsu.edu
AF: coaps, florida state university, tallahassee, fl 32306-2840
AU: larow, t
EM: larow@coaps.fsu.edu
AF: coaps, florida state university, tallahassee, fl 32306-2840
AU: cocke, s
EM: scocke@mailer.fsu.edu
AF: coaps, florida state university, tallahassee, fl 32306-2840
AB: The simulated soil moisture from the Florida States University (FSU) climate model coupled to the community land model (CLM2) is evaluated using two reanalyses (NCEP/DOE R2 and ERA40) and in-situ observations over Illinois and China from the Global Soil Moisture Data Bank. While the soil moisture was prescribed in the previous FSU climate model, the implementation of the CLM2 within the FSU model (hereafter, FSUCLM) provides a prognostic 10 layer soil moisture parameterization (both soil liquid water and soil ice). The comparison of soil moisture annual cycle between the FSUCLM and the two reanalyses over the period of 1992-1996 for the top 10cm shows that, in the Northern Hemisphere (NH), the coupled model and the ERA40 are in phase, but out of phase with the R2. In the Southern Hemisphere (SH), all of them are in phase. This result might be due to the fact that soil ice plays a key role in determining the soil moisture variation over the NH. An accurate soil moisture simulation requires the model to account for freezing process. While a parameterization of soil ice process is included in both the FSUCLM and the ERA40, the R2 does not. The two reanalyses and the FSUCLM are also compared to in-situ observations in China and Illinois. The soil liquid water component from the FSUCLM is used here, since not soil ice but soil liquid water soil is observed. The FSUCLM turns out to be following the observed variations better than both reanalyses. It is thus shown that the inclusion of explicit soil ice treatment in a land surface model has an impact on soil moisture annual variability.
DE: 1610 Atmosphere (0315, 0325)
DE: 1866 Soil moisture
DE: 3309 Climatology (1620)
DE: 3322 Land/atmosphere interactions
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly