ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2012, Vol. 9, No. 4, pp. 186-193

Retrieval of surface air temperature during cold air outbreaks on the example of the Bering Sea using AMSU-A measurements

M.K. Pichugin 
V.I. Il`ichev Pacific Oceanological Institute Far Eastern Branch Russian Academy of Scinces, 690041, Vladivostok, Baltiyskaya, 43
Determination of the turbulent heat fluxes over high latitude regions becomes more actual problem. The calculation
of these fluxes requires the use of bulk aerodynamic method requiring estimates of the sea surface temperature (Tw),
near-surface wind speed (W), air temperature (ta), and specific humidity (qa). Errors in algorithms of satellite retrievals
of near -surface parameters have been shown to be the main sources of uncertainty in computation of the fluxes. This
work describes regression algorithm of the retrieving ta over the Bering Sea. The algorithm is based on relationship between
ta and brightness temperature at a frequency 52.8 GHz (Tb52.8) observed from the Advanced Microwave Sounding
Unit-A (AMSU-A) onboard NOAA satellites. Modeling of the Tb52.8 has shown that relationship becomes closer
if the brightness temperature corrected for the influence of cloud liquid water and surface wind speed. The regression
coefficients were obtained from a collocated array of satellite data and measurements of ocean buoys in the Bering
Sea during cold air outbreaks. RMS error of the air temperature algorithm is 1,71 K for the collocated array. Also, the
use of the air temperature algorithm during cold air outbreak over the Bering Sea is shown. Estimates of the turbulent
sensible heat fluxes from satellite measurements were obtained
Keywords: air-sea interaction, turbulent fluxes, AMSU-A, brightness temperatures, air temperature, cold air outbreaks, Bering Sea
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