Importance of fluvial inflows in the intra-lake heterogeneity of surface water temperatures on the Tibetan Plateau

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2025-05-24 DOI:10.1038/s41612-025-01083-z

Bingqing Du, Jing Zhou, Deliang Chen, Hu Liu, Baoyan Liu, Ruishun Liu, Lei Wang

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Abstract

Lakes on the Tibetan Plateau (TP) are highly responsive to environmental change. Spatiotemporal variations in the lake surface water temperature (LSWT) significantly impact regional ecosystem stability, carbon cycling, and regional climate. However, due to limited observations, the intra-lake heterogeneity of LSWT and its driving forces remain unclear. By employing multi-source datasets, especially observation-constrained LSWT and lake inflow data, along with the random forest method, we analyzed three TP lakes (Nam Co, Siling Co, and Paiku Co) during 2001‒2019. No evident inter-annual LSWT changes were detected. Lake inflow (up to 40% contribution) was the main driver of LSWT variations from July to November, followed by air temperature. Spatially, LSWT intra-lake heterogeneity varied among lakes, with Siling Co showing the largest difference (nearly 4 °C) in autumn, mainly caused by river inflow locations and lake bathymetry. This study improves our understanding of the spatiotemporal variations of LWST for high-mountain lakes, providing insights for climate-change adaptation and water resources management.

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河流流入对青藏高原湖内地表水温度异质性的重要性

青藏高原湖泊对环境变化具有高度的响应性。湖泊地表水温度的时空变化对区域生态系统稳定性、碳循环和区域气候具有重要影响。然而，由于观测资料有限，湖泊内LSWT的异质性及其驱动力尚不清楚。利用多源数据集，特别是观测约束的LSWT和湖泊入流数据，结合随机森林方法，对2001-2019年3个TP湖（Nam Co、Siling Co和Paiku Co）进行了分析。未发现明显的年际LSWT变化。7 - 11月湖泊入流（贡献高达40%）是LSWT变化的主要驱动因素，其次是气温。从空间上看，不同湖泊的湖内温度异质性存在差异，以四陵湖秋季差异最大（近4°C），主要由河流入流位置和湖泊水深造成。该研究有助于进一步认识高山湖泊地表温度的时空变化，为气候变化适应和水资源管理提供参考。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.