Abstract
Lake surface water temperature (LSWT) is of vital importance for hydrological and meteorological studies. The LSWT ground measurements in the Tibetan Plateau (TP) were quite scarce because of its harsh environment. Thermal infrared remote sensing is a reliable way to calculate historical LSWT. In this study, we present the first and longest 35-year (1981–2015) daytime lake-averaged LSWT data of 97 large lakes (>80 km2 each) in the TP using the 4-km Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) data. The LSWT dataset, taking advantage of observations from NOAA’s afternoon satellites, includes three time scales, i.e., daily, 8-day-averaged, and monthly-averaged. The AVHRR-derived LSWT has a similar accuracy (RMSE = 1.7 °C) to that from other data products such as MODIS (RMSE = 1.7 °C) and ARC-Lake (RMSE = 2.0 °C). An inter-comparison of different sensors indicates that for studies such as those considering long-term climate change, the relative bias of different AVHRR sensors cannot be ignored. The proposed dataset should be, to some extent, a valuable asset for better understanding the hydrologic/climatic property and its changes over the TP.
Highlights
Background & SummaryLakes, accounting for 1.8% of global land surface area[1], support enormous biodiversity[2] and provide water resources for industry and farming
In order to obtain a deeper and more comprehensive understanding of its climatic-scale properties, lake surface water temperature (LSWT) data over the Tibetan Plateau (TP) for a much longer time period are in great need
Aiming to fill the gap and to better understand the LSWT changes over a much longer period, this paper presents the longest 35-year (1981–2015) daytime LSWT data of all 97 large lakes (>80 km[2] each) in the TP at daily, 8-day averaged and monthly averaged time scales, using the 4-km resolution Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) level-1b data
Summary
Baojian Liu[1], Wei Wan[1], Hongjie Xie[2], Huan Li1, Siyu Zhu[3], Guoqing Zhang[4], Lijuan Wen5 & Yang Hong[1,3,6]. Lake surface water temperature (LSWT) is of vital importance for hydrological and meteorological studies. We present the first and longest 35-year (1981–2015) daytime lake-averaged LSWT data of 97 large lakes (>80 km[2] each) in the TP using the 4-km Advanced Very High Resolution Radiometer (AVHRR) Global Area Coverage (GAC) data. The AVHRR-derived LSWT has a similar accuracy (RMSE = 1.7 °C) to that from other data products such as MODIS (RMSE = 1.7 °C) and ARC-Lake (RMSE = 2.0 °C). An inter-comparison of different sensors indicates that for studies such as those considering long-term climate change, the relative bias of different AVHRR sensors cannot be ignored. The proposed dataset should be, to some extent, a valuable asset for better understanding the hydrologic/climatic property and its changes over the TP
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