标题：NORMALIZATION OF MICROWAVE TIME SERIES OBSERVATIONS (1979 - 2005) : APPLICATION TO SURFACE MELTING ANALYSIS OVER ANTARCTICA AND SURFACE TEMPERATURE OVER CANADA/ALASKA
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-7/C50
出版社：Copernicus Publications
摘要：Polar regions are anticipated to evolve significantly in response to the expected increase in temperature over the next decades. To bypass the lack of meteorological stations in boreal and austral high latitudes, remote sensing observations are the only alternative for characterizing past trends and monitoring the actual evolution. This project deals with the development of two new databases of climatic indicators (melting duration over Antarctica and summer surface temperature over Canada/Alaska) derived from satellite microwave measurements as this type of data presents the strong advantage of being slightly influenced by the atmosphere. Starting with SMMR data, observations are available since 1979 (EASE-Grid NSIDC database). However, the 1979–2005 period includes observations from 4 different sensors (SMMR and SSM/I on board DMSP F8, F11 and F13) whose characteristics vary (mainly calibration and time of acquisition). As a consequence, sensor replacement induces significant artifacts in the derived surface geophysical parameters which, in turn, bias the climatic analysis of the series. We present here two different methods to normalize temperature to overcome calibration variations and changes in data acquisition time (variable overpass time, differences between satellites and satellite drift), as well as to interpolate missing data
