| 光谱学与光谱分析 |
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| Study on Orbit Radiometric Calibration for FY-2 Visible Band based on Deep Convective Cloud |
| CHEN Lin1, 2, XU Na1, 2, HU Xiu-qing1, 2*, LU Feng1, 2, ZHANG Peng1, 2 |
1. National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China
2. Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China |
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Abstract A radiometric calibration method is described in this paper by using the deep convective clouds (Deep Convective Cloud, DCC) target for FY-2 visible channel. The deep convective cloud can be used as the radiometric calibration transfer object. The on-operational FY-2 radiometric calibration bias and the long-term degradation trend are evaluated according to the AQUA/MODIS instrument as the baseline of radiometric reference and DCC. The results show that: (1) There are different degrees of degradation for FY-2D, FY-2E and FY-2F, among which FY-2D has the biggest degradation due to the longest period. The annual rates of degradation for FY-2D and FY-2E are quite similar, 1.67% and 1.69% respectively, whereas the rate for FY-2F is lower with 0.81%; (2) During the period of satellite eclipse, the instruments are not stable and this phenomenon could be detected by the DCC method;(3) There are bias in the the operational radiometric calibration between FY-2 and AQUA/MODIS, which is treated as the the radiometric reference usually. The radiometric calibration method based on DCC could work well in the radiometric calibration for FY-2. The results will help us to understand the degradation of instrument and for quantitative application usage.
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Received: 2015-05-29
Accepted: 2015-11-18
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Corresponding Authors:
HU Xiu-qing
E-mail: huxq@cma.gov.cn
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