| Autor: |
Tiejun Chang, Xiaoxiong Xiong |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Earth and Space Science, Vol 6, Iss 12, Pp 2303-2316 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2333-5084 |
| DOI: |
10.1029/2019EA000617 |
| Popis: |
Abstract Geostationary satellite (GOES)‐16/Advanced Baseline Imager (ABI) and Himawari‐8/Advanced Himawari Imager (AHI) represent a significant improvement over the imagers on board previous GOES. Their bands 7–16 are infrared channels covering the 3.9‐ to 13.3‐μm spectral range and with a subpoint spatial resolution of 2 km. Their spectral coverage of the thermal emissive bands (TEBs) is almost identical, and both instruments employ similar calibration strategies using an on‐board blackbody and a space look. The intercomparison between the two instruments will be very helpful for their calibration assessments and their product quality enhancements. GOES‐16 was launched on 19 November 2016, initially to a test position at 89.5° west and reached its operational position (longitude of 75.2° west) on 11 December 2017. The Himawari‐8 spacecraft was launched on 7 October 2014 and the observation focuses on Asia‐Pacific region. In this work, an intercomparison of their TEB measurement is performed using double difference with Aqua Moderate Resolution Imaging Spectroradiometer (MODIS). The same type of scenes are selected for the two instruments, and their measurements with the closest observation times are compared with Aqua MODIS matching bands. The view angle effect is corrected and their spectral mismatching effect is estimated. The dependence on the scene uniformity is analyzed. The ABI‐AHI differences are within 0.3K for bands 10 (7.35 μm), 11 (8.44 μm), 12 (9.64 μm), and 14 (11.24 μm), and up to 0.8K difference for bands 15 (12.38 μm) and 16 (13.28 μm). The ABI precision is better than AHI for all TEB and their image navigation and registration precisions are comparable. In general, the ABI performances before and after relocation are consistent. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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