Monitoring the frozen duration of Qinghai Lake using satellite passive microwave remote sensing low frequency data |
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Authors: | Tao Che Xin Li and Rui Jin |
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Institution: | (1) Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 710000, China |
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Abstract: | The Qinghai Lake is the largest inland lake in China. The significant difference of dielectric properties between water and
ice suggests that a simple method of monitoring the Qinghai lake freeze-up and break-up dates using satellite passive microwave
remote sensing data could be used. The freeze-up and break-up dates from the Qinghai Lake hydrological station and the MODIS
L1B reflectance data were used to validate the passive microwave remote sensing results. The validation shows that passive
microwave remote sensing data can accurately monitor the lake ice. Some uncertainty comes mainly from the revisit frequency
of satellite overpass. The data from 1978 to 2006 show that lake ice duration is reduced by about 14–15 days. The freeze-up
dates are about 4 days later and break-up dates about 10 days earlier. The regression analyses show that, at the 0.05 significance
level, the correlations are 0.83, 0.66 and 0.89 between monthly mean air temperature (MMAT) and lake ice duration days, freeze-up
dates, break-up dates, respectively. Therefore, inter-annual variations of the Qinghai Lake ice duration days can significantly
reflect the regional climate variation.
Supported by National Basic Research Program of China (Grand No. 2007CB411506), and National Natural Science Foundation of
China (Grand Nos. 40601065 and 40701030) |
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Keywords: | lake ice passive microwave remote sensing freeze-up break-up Qinghai Lake climate change |
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