DOI: 10.5194/hess-21-1895-2017
Scopus记录号: 2-s2.0-85017126855
论文题名: Seasonal thermal regime and climatic trends in lakes of the Tibetan highlands
作者: Kirillin G ; , Wen L ; , Shatwell T
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 4 起始页码: 1895
结束页码: 1909
语种: 英语
Scopus关键词: Atmospheric humidity
; Atmospheric temperature
; Boundary layers
; Temperature measurement
; Atmospheric forcing
; Lake surface temperature
; Lake temperatures
; Parameterization schemes
; Satellite observations
; Seasonal temperature
; Short-wave radiation
; Tibetan Plateau
; Lakes
; air temperature
; atmospheric forcing
; boundary layer
; climate change
; humidity
; ice cover
; lacustrine environment
; overturn
; parameterization
; seasonal variation
; shortwave radiation
; solar radiation
; stratification
; temperature profile
; thermal regime
; trend analysis
; turbidity
; upland region
; China
; Gyaring Lake
; Ngoring Lake
; Qinghai
; Qinghai-Xizang Plateau
英文摘要: The hydrology of the lake-rich Tibetan Plateau is important for the global climate, yet little is known about the thermal regime of Tibetan lakes due to scant data. We (i) investigated the characteristic seasonal temperature patterns and recent trends in the thermal and stratification regimes of lakes on the Tibetan Plateau and (ii) tested the performance of the one-dimensional lake parameterization scheme FLake for the Tibetan lake system. For this purpose, we combined 3 years of in situ lake temperature measurements, several decades of satellite observations, and the global reanalysis data. We chose the two largest freshwater Tibetan lakes, Ngoring and Gyaring, as study sites. The lake model FLake faithfully reproduced the specific features of the high-altitude lakes and was subsequently applied to reconstruct the vertically resolved heat transport in both lakes during the last 4 decades. The model suggested that Ngoring and Gyaring were ice-covered for about 6 months and stratified in summer for about 4 months per year with a short spring overturn and a longer autumn overturn. In summer the surface mixed boundary layer extended to 6-8 m of depth and was about 20 % shallower in the more turbid Gyaring. The thermal regime of the transparent Ngoring responded more strongly to atmospheric forcing than Gyaring, where the higher turbidity damped the response. According to the reanalysis data, air temperatures and humidity have increased, whereas solar radiation has decreased, since the 1970s. Surprisingly, the modeled mean lake temperatures did not change, nor did the phenology of the ice cover or stratification. Lake surface temperatures in summer increased only marginally. The reason is that the increase in air temperature was offset by the decrease in radiation, probably due to increasing humidity. This study demonstrates that air temperature trends are not directly coupled to lake temperatures and underscores the importance of shortwave radiation for the thermal regime of high-altitude lakes. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79205
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany; Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China
Recommended Citation:
Kirillin G,, Wen L,, Shatwell T. Seasonal thermal regime and climatic trends in lakes of the Tibetan highlands[J]. Hydrology and Earth System Sciences,2017-01-01,21(4)