Climate parameters from satellite spectral measurements. Part I: Collocated AVHRR and HIRS/2 observations of spectral greenhouse parameter
- Univ. of Wisconsin, Madison, WI (United States)
- Princeton Univ., NJ (United States)
An automated method of monitoring various climate parameters using collected Advanced Very High Resolution Radiometer (AVHRR) and High-Resolution Infrared Sounder-2 (HIRS/2) observations has been developed. The method, referred to as CHAPS (collocated HIRS/2 and AVHRR products) was implemented during the months of July 1993 and January and July 1994. This paper presents the oceanic cloud screening method and analysis of the spectral greenhouse parameter (g{sub {lambda}}) for July 1993 and January 1994. In addition, the CHAPS derived clear-sky parameters are compared to the NEDIS historical dataset. There is agreement between NEDIS and CHAPS for the g{sub 6.7} and g{sub 7.3}. The NESDIS 8.2-{mu}m data appears to be cloud contaminated. Through comparison with CHAPS, it is suggested that the mode, rather than the mean, provides the better estimate of the central tendency of the NEDIS clear-sky 8.2-{mu}m radiance distribution, particularly for regions with extensive low-level cloud cover. The relationship between the spectral greenhouse parameter and the broadband greenhouse parameter is discussed. The range in broadband g for warm tropical SSTs is driven by spectral changes at wavelengths sensitive to upper-tropospheric water vapor. For cooler SSTs associated with the middle latitudes, the range in g is a function of the spectral greenhouse parameter sensitive to the temperature structure of the upper troposphere. 34 refs., 20 figs., 2 tabs.
- OSTI ID:
- 379130
- Journal Information:
- Journal of Climate, Vol. 9, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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