HR: 14:15h
AN: H53F-02    [Abstracts]
TI: The Distribution of Evaporation and Precipitaion
AU: * Fan, A
EM: t.f.fan@larc.nasa.gov
AF: SSAI, suite 200 One enterprise parkway, Hampton, VA 23666, United States
AU: Lin, B
EM: bing.lin-1@nasa.gov
AF: NASA, Langley Research Center, Hampton, VA 23681, United States
AB: Since precipitation amounts may not be proportional to the evaporation at each location, understanding the distribution of precipitation and evaporation is very important for climate water cycle studies. This study uses data from the version 2 of Goddard Satellite-Based Surface Turbulent Fluxes (GSSTF) data for ocean evaporation. GSSFTF are based on all available SSM/I's (F-8, -10, -11, -13, -14) data. Because there has been no global land energy budget, forcing, and water budget data sets available, four assimilated results (Noah, CLM2, Mosaic, and VIC) from GLDAS (Global Land Data Assimilation System) are analyzed. The rainfall data for both ocean and land are from the Global Precipitation Climatology Project (GPCP). Evaporation over oceans is high over 20- 30 degree regions and lower over equator because of the combination of moisture and wind stress. The evaporation over land are the highest along the equator and dramatically reduced for regions higher than 30 degree.The rainfall are mostly cocentrate and violent along ITCZ and SPCZ, and much lower at regions higher than 25 degree latitudes over both ocean and land.These off-phase distributions between evaporation and precipitation are basically caused by atmosphere dynamics. As expected, there are more evaporation than rain over ocean and the other way around over land. The estimates of precipitation and evaporation over oceans have high accuracy from the available data sets. They could be used to estimate the moisture transports from ocean to land and river runoffs and to validate the land surface models.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 1818 Evapotranspiration
DE: 1836 Hydrological cycles and budgets (1218, 1655)
SC: Hydrology [H]
MN: 2007 Joint Assembly