摘要
青藏高原上分布众多湖泊,但由于缺乏观测资料,对高原湖面冰层的热力过程知之甚少.本研究收集了青藏高原5个湖泊的湖水温度扩线观测资料,发现在湖面结冰完全融化前的某个时间点以后,近表层湖水温度普遍存在快速上升的现象,有的湖泊甚至上升了7~8℃.本文的科学贡献是当水温达到Tρmax(湖水最大密度对应温度)后,近表层湖水开始快速升温,并提出了一个概念模型来解释该现象.湖面结冰融化阶段,穿透冰层的太阳辐射是湖水温度快速增温的关键.青藏高原冬季太阳辐射强,而且湖泊冰表面反照率低,但是目前常用的湖泊模型往往假设冰层吸收了所有的太阳辐射,这与观察到的事实不符,后续研究中需要改进.
The Tibetan Plateau(TP)is home to about 1400 lakes with areas greater than 1 km2[1].A trend towards warmer and wetter conditions on the TP has resulted in substantial expansion of the lake area since the mid-1990s,which has attracted widespread attention[1-3].Meanwhile,climate change can alter lake ice duration and lake mixing regimes[4].
作者
拉珠
阳坤
侯居峙
王君波
类严斌
朱立平
陈莹莹
王明达
何小刚
Lazhu;Kun Yang;Juzhi Hou;Junbo Wang;Yanbin Lei;Liping Zhu;Yingying Chen;Mingda Wang;Xiaogang He(Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;Ministry of Education Key Laboratory for Earth System Modeling.Department of Earth System Science,Tsinghua University,Beijing 100084,China;Center for Excellence in Tibetan Plateau Earth Sciences,Chinese Academy of Sciences,Beijing 100101,China;School of Ceography,Liaoning Normal University,Dalian 116029,China;Department of Civil and Environmental Engineering,National University of Singapore,Singapore 117576,Singapore)
基金
supported by the Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0206)
the National Natural Science Foundation of China (41701041, 41975125, and 41988101)。
