摘要:

Atmospheric temperature retrievals obtained by a simultaneous physical scheme and a statistical scheme are compared using data gathered over the Weddell Sea, Antarctica during January 1986. Ground truth data were obtained from radiosonde ascents. The statistical approach gave errors smaller than those of the physical method. Several modifications to the physical scheme were tried but, although some individual retrievals did show an improvement, the errors were still greater than for the statistical scheme. The results are for retrievals over the sea or low lying coast; it is expected that the physical scheme will give better results than the statistical scheme over the high Antarctic plateau as it allows for the effect of ground elevation in the temperature profile determination.

ISSN:0143-1161    

DOI:10.1080/01431169208904031

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Minimum temperature is an important climatological element, but the distribution ofclimatological stations may not be suitable for more than a coarse resolution of the spatial variation in miminum temperature. Land surface temperatures can be derived from AVHRR data but there are a number of problems, particularly variations in emissivity and the use of appropriate ground truth. The emissivity variations can be minimized by selecting dates with a widespread deep snow cover. The appropriate ground truth for the AVHRR data might be expected to be the surface minima but this study suggests that they are subject to very local influences and that screen minima are more reliable. The results may have a general application to snow-covered higher latitude areas of similar relief.

ISSN:0143-1161    

DOI:10.1080/01431169208904032

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor