HR: 0800h
AN: H31A-0126    [Abstracts]
TI: Evaluations of global land-to-oceans fresh water discharge and evapotranspiration
AU: * Seo, K
EM: seo.kiweon@kopri.re.kr
AF: Korea Polar Research Institute, 503 Get-Pearl Tower, 7-50 Songdo-Dong, Incheon, 406- 840, Korea, Republic of
AU: Waliser, D E
EM: duane.waliser@jpl.nasa.gov
AF: Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasdena, ca 91107, United States
AU: Tian, B
EM: baijun.tian@jpl.nasa.gov
AF: Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasdena, ca 91107, United States
AU: Famiglietti, J
EM: jfamigli@uci.edu
AF: University of California at Irvine, 3317 Croul Hall, Irvine, ca 92697, United States
AU: Syed, T
EM: syed@uci.edu
AF: University of California at Irvine, 3317 Croul Hall, Irvine, ca 92697, United States
AB: We estimate global fresh water discharge from land to oceans (R) and evapotranspiration (ET) on monthly time scales using a number of complimentary hydrologic data sets. This estimate is possible due to the new capability of measuring oceanic and land water mass changes (dS_o/dt,dS_l/dt) from GRACE as well as the space-based measurements of oceanic and land precipitation (P_o,P_l) and oceanic evaporation (E_o). R can be estimated through the water balance equation over oceans, R=E_o-P_o-dS_o/dt, and then ET is estimated based on water mass balance over land, ET=P_l-R-dS_l/dt. Monthly time series of R show peaks in July and December, and those of ET shows peaks in March and August. In general, our estimates of R and ET are correlated with P_l well indicating qualitatively that our estimates capture temporal patterns of R and ET reasonably. We compare our estimation for R and ET to 20th century simulations from the WCRP CMIP3 multi-model archive that are assessed in the IPCC 4th Assessment Report. R and ET from AOGCMs mainly show annual cycles, but those estimated in this study exhibit additional semi-annual changes. The estimates of R and ET examined in this study are potentially useful to constraint current AOGCMs models.
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1836 Hydrological cycles and budgets (1218, 1655)
SC: Hydrology [H]
MN: 2007 Fall Meeting