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- W3106685514 endingPage "100012" @default.
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- W3106685514 abstract "Qinghai Lake in China, which is located at an altitude of 3260 m, is the highest inland lake among the 50 largest lakes in the world. Therefore, satellite measurement of water quality is the most important and feasible tool for routinely assessing the water property and its variations in Qinghai Lake. We derive the normalized water-leaving radiance spectra nLw(λ) in Qinghai Lake from measurements of the Visible Infrared Imaging Radiometer Suite (VIIRS), after accurately computing the top-of-atmosphere Rayleigh radiances in the satellite Level-1 to Level-2 ocean color data processing. Satellite-derived nLw(λ) spectra, chlorophyll-a (Chl-a) concentration, and the water diffuse attenuation coefficient at 490 nm, Kd(490), in the period of 2012–2018 are used to evaluate and understand the dynamics of water properties in Qinghai Lake. Results show that VIIRS-measured nLw(λ) spectra match quite well with the in situ data, e.g., the mean and median ratios of the VIIRS-derived and in situ-measured nLw(λ) at 443 nm are 0.9741 and 0.9898, respectively. Enhanced nLw(λ) at 486 nm and 551 nm can be observed from satellite-derived nLw(λ) spectra for the entire lake. VIIRS-derived nLw(λ) spectra show significant seasonal cycles. High nLw(λ) values occur in July while low values occur in April. Results also show the seasonal and interannual changes of Chl-a and Kd(490) in Qinghai Lake. Low Chl-a and Kd(490) are normally observed in April, and they typically peak in the early summer. Peculiarly, however, anomaly high values in Chl-a and Kd(490) occurred in June 2016. The analysis of empirical orthogonal functions (EOFs) shows the dominant modes for Chl-a and Kd(490) are interannual modes that account for about 79.1% and 31.5% of the their total variances, respectively. The second EOF mode for Chl-a and Kd(490) shows the seasonal changes, and contributes to about 6.1% and 14.0% of their respective total variances." @default.
- W3106685514 created "2020-12-07" @default.
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- W3106685514 date "2020-12-01" @default.
- W3106685514 modified "2023-10-14" @default.
- W3106685514 title "Water property in high-altitude Qinghai Lake in China" @default.
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- W3106685514 doi "https://doi.org/10.1016/j.srs.2020.100012" @default.
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