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Systematic Bias in the NOAA Outgoing Longwave Radiation Dataset?

Gadgil, Sulochana and Guruprasad, Asha and Srinivasan, J (1992) Systematic Bias in the NOAA Outgoing Longwave Radiation Dataset? In: Journal of Climate, 5 (8). pp. 867-875.

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Abstract

The outgoing longwave radiation (OLR) fluxes derived from NOAA-SR (1974-78) are found to be consistently higher than those from NOAA-7 (1982 onward) over a large part of the tropical belt. Analysis of the variation of the mean July-August OLR and the rainfall over the Indian region suggests that the lower values of OLR in the latter period cannot be attributed to more intense convection. Thus, the consistently lower values of OLR in the latter period over a large part of the tropical belt (including the oceanic regions) may be a manifestation of a systematic bias arising from various factors such as changes in instruments, equatorial crossing time, etc. Obviously, if such a bias is present, it has to be removed before the dataset can be used for the study of interannual variations. If the bias is removed by a simple method based on the variation of convection over the entire tropical belt, the OLR variations over the Indian region become consistent with the rainfall variations.

Item Type: Journal Article
Additional Information: The copyright of this article belongs to American Meteorological Society.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 09 Oct 2006
Last Modified: 19 Sep 2010 04:32
URI: http://eprints.iisc.ernet.in/id/eprint/8816

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