摘要
介绍了利用高精度的TERRA/MODIS观测资料对FY-2E红外窗区和水汽吸收通道进行绝对交叉定标的方法,并选用2010年5、7和12三个月的卫星数据进行了交叉定标计算。结果表明,交叉定标系数计算亮温与MODIS匹配点处实测结果非常接近,约90%的亮温偏差小于1K,其中高温区结果更稳定,偏差小于低温区,这主要是由于低温区杂散光影响显著造成的。总的说来,借助TERRA/MODIS可以实现对FY-2E/VISSR的高频次高精度的绝对定标,为FY-2E在轨替代定标提供重要的方法基础.
This paper addresses the cross-calibration method of infrared window and water vapor channels of VISSR （Visible and Infrared Spin Scan Radiometer） with reference data provided by the onboard geostationary satellite FY-2E with MODIS （ MoDerate resolution Imaging Spectroradiometer） and the onboard polar-orbit satellite TERRA. The cross- calibration is implemented using the satellite remote date in May, July and December of 2010. The results show that the bright temperature calculated using cross-calibration coefficients is nearly equal to the observed value of MODIS for all collocation samples, and about 90 percent of temperature bias is less than 1K. It can also be seen that the calibration slope decreases obviously from May to the beginning of July, and ascends slightly in the last ten-day of July, then keeps steady in December. The variation of calibration coefficients reveals great consistent with that of remote temperatures. All in all, the cross-calibration method described here can increase frequency and accuracy, and provide a methodologi- cal foundation for on-orbit calibration of FY-2E.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第4期319-324,384,共7页
Journal of Infrared and Millimeter Waves
基金
国家自然科学基金(41105010)
国家重点基础研究发展计划(973计划)(2011CB403401)~~
关键词
静止气象卫星
交叉绝对定标
红外通道
时空匹配
光谱匹配
geostationary meteorological satellite
cross-calibration
infrared channel
temporal and spatial collocation
spectral matching
作者简介
徐娜（1982-），女，山东烟台人，博士，主要研究领域为大气辐射传输和星载传感器辐射定标，E-mail：xuna@cma．gov．cn．
