HR: 1340h
AN: A33D-0101    [Abstracts]
TI: An equation for determining ground heat flux according to land skin temperature observations from in-situ stations and satellites
AU: * Tsuang, B
EM: tsuang@nchu.edu.tw
AF: Dept. of Environ. Eng., Nat'l Chung-Hsing Univ., 250 Kuokang Rd., Taichung, 402 Taiwan
AB: Due to the rapid progress of remote sensing techniques, skin temperature can now be observed with global coverage from satellites. This study derives an equation for utilizing skin temperature measurements to determine ground heat flux. This equation is verified at the FIFE and 4 Ameri Fluxnet sites. A preliminary monthly global data set of ground heat flux with 1 degree resolution, covering the years 1984-1995, is derived based on skin temperature observations obtained via satellite. It shows that the seasonal variation of ground heat flux over land can be determined 1.5 months ahead by observing the increasing rate of skin temperature, and that the variation increases from ­O2 W m-2 at the Equator to ­O20 W m-2 at the Poles. Over land, the resulting ground heat flux can be compared with that of the ERA15 reanalysis, showing root-mean-square (rms) differences of about 5 W m-2. Over oceans, the flux can be compared with that of the reanalysis only in regions where horizontal advected heat transport and upwelling mechanisms are known to be weak, with rms differences of about 40 W m-2.
DE: 3322 Land/atmosphere interactions
DE: 3360 Remote sensing
DE: 3309 Climatology (1620)
DE: 1833 Hydroclimatology
DE: 1600 GLOBAL CHANGE (New category)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting