期刊
SCIENTIFIC REPORTS
卷 8, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41598-018-19431-w
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资金
- National Natural Science Foundation of China [4177011812]
- National Natural Science Foundation for Youth Science Funds of China [10010108B1339-2451]
- CAS Pioneer Hundred Talents Program
- China High-Resolution Earth Observation Projects [30-Y20A20-9003-15/17, 32-Y20A17-9001-15-17-2]
- International Partnership Program of Chinese Academy of Sciences [131C11KYSB20160061]
Analysis of cloud cover and its diurnal variation over the Tibetan Plateau (TP) is highly reliant on satellite data; however, the accuracy of cloud detection from both polar-orbiting and geostationary satellites over this area remains unclear. The new-generation geostationary Himawari-8 satellites provide highresolution spatial and temporal information about clouds over the Tibetan Plateau. In this study, the cloud detection of MODIS and AHI is investigated and validated against CALIPSO measurements. For AHI and MODIS, the false alarm rate of AHI and MODIS in cloud identification over the TP was 7.51% and 1.94%, respectively, and the cloud hit rate was 73.55% and 80.15%, respectively. Using hourly cloud-cover data from the Himawari-8 satellites, we found that at the monthly scale, the diurnal cycle in cloud cover over the TP tends to increase throughout the day, with the minimum and maximum cloud fractions occurring at 10: 00 a.m. and 18: 00 p.m. local time. Due to the limited time resolution of polarorbiting satellites, the underestimation of MODIS daytime average cloud cover is approximately 4.00% at the annual scale, with larger biases during the spring (5.40%) and winter (5.90%).
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