Open AccessA generalized algorithm for retrieving cloudy sky skin temperature from satellite thermal infrared radiances
Author(s) -
Jin Menglin,
Dickinson Robert E.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jd900318
Subject(s) - pixel , environmental science , satellite , radiance , sky , latitude , remote sensing , northern hemisphere , albedo (alchemy) , meteorology , algorithm , atmosphere (unit) , atmospheric sciences , computer science , physics , geology , geodesy , optics , astronomy , art , performance art , art history
A physical algorithm for calculating cloudy pixel skin temperature from its neighboring clear pixels is proposed generalizing that of Jin [2000]. Two neighboring pixels over the same land cover have a difference in temperature largely explained by surface insolation. Hence this algorithm starts from the surface energy balance equation (SEB) and expresses each energy term of SEB as a function of skin temperature. Then SEB is solved to derive cloudy pixel skin temperature from neighboring clear skin temperature plus a correction term determined by surface insolation, air temperature, and wind speed. This algorithm can be used for nights and winter hemisphere high latitudes where there is no surface insolation and is applicable to any surface where the principle of SEB is applicable. The algorithm is evaluated by using FIFE and BOREAS field experiments. Its global application has been examined through simulations with the NCAR Community Climate Model (CCM) coupled with the Biosphere‐Atmosphere Transfer Scheme (BATS) simulations. The accuracy of the algorithm is encouraging: the rms error at a monthly pixel level is 1–2 K. Observed errors are greater when there is precipitation.