HR: 0830h
AN: OS21C-1143    [PDF]
TI: Variations of Oceanic Evaporation Derived from SSM/I
AU: * Chiu, L
EM: lchiu@gmu.edu
AF: Center for Earth Observing and Space Research, ST-1 Rm 211, MSN 5C3 George Mason University, fairfax, VA 22030 United States
AU: * Chiu, L
EM: lchiu@gmu.edu
AF: Code 974, Hydrological Sciences Branch, NASA/GSFC, Greenbelt, MD 20771 United States
AU: Xing, Y
EM: yxing@gmu.edu
AF: Center for Earth Observing and Space Research, ST-1 Rm 211, MSN 5C3 George Mason University, fairfax, VA 22030 United States
AU: Chang, A
EM: achang@rainfall.gsfc.nasa.gov
AF: Code 974, Hydrological Sciences Branch, NASA/GSFC, Greenbelt, MD 20771 United States
AB: Variations of the oceanic evaporation of recent years were examined using latent heat flux derived from Special Sensor Microwave Imager (SSM/I) on board the Defense Meteorological Satellite Program (DMSP) satellites. Analysis of the version 2 of the Goddard Sea Surface Turbulent Flux (GSSSTF2) data set shows an increase of global oceanic evaporation of 17 percent over the period July 1988-December 2000. Data gaps exist in the major rain belts due mostly to non-retrieval in heavy rain, but there are no trends in temporal coverage. The first Emprical Orthogonal Function (EOF) of the non-seasonal data, which explains 9.2 percent of the variance, is characterized by changes of the same sign in most regions, dominated by changes in the subtropics oceanic dry regions. The time series shows an increasing trend that starts around 1990 of ~1.5 percent per year. An Empirical Mode Decomposition (EMD) shows a long-term mode that shows similar pattern as the global trend. The first EOF pattern is interpreted as an enhanced Hadley type circulation. The second EOF, explaining 5.7 percent of the variance, is characterized by an equatorial east-west and a mid ocean north-south dipole in the Pacific, and its ssociated time series is correlated to a Southern Oscillation Index at 0.74, significant at the 95 percent confidence level.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 1600 GLOBAL CHANGE (New category)
DE: 1640 Remote sensing
DE: 1655 Water cycles (1836)
DE: 1854 Precipitation (3354)
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting