ABSTRACT This study was carried out to quantify the physical processes of lakes in the Tibetan Plateau using the Community Land Model, version 4.5 (CLM4.5), coupled with a physically based, 10-layer lake model developed by the National Center for Atmospheric Research. The CLM was forced with 10 km resolution reanalysis data to attempt to understand detailed lake processes and how these processes affect lake surface temperature. In this study, we simulated seasonal and interannual variations of lake surface temperature for Lake Qinghai, Zhaling Co, and Nam Co in the Tibetan Plateau and compared these simulations with observations. The results showed that the CLM4.5 lake model simulations reproduced the observed lake surface temperatures for Lake Qinghai and Zhaling Co well but reproduced those for Nam Co poorly. Through detailed analysis, we found that the simulated biases for Nam Co result largely from the unrealistic parameterization of eddy diffusivity. By expanding this parameter, the lake surface temperature simulations improved remarkably. In addition, erroneous lake ice cover simulations contributed to the simulated lake surface temperature bias in the cold seasons.

中文翻译：

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使用物理湖模型模拟青藏高原三个湖泊的水面温度

摘要 本研究使用社区土地模型 4.5 版 (CLM4.5) 以及由国家大气研究中心开发的基于物理的 10 层湖泊模型来量化青藏高原湖泊的物理过程。 . CLM 被迫使用 10 公里分辨率的再分析数据，试图了解详细的湖泊过程以及这些过程如何影响湖面温度。在这项研究中，我们模拟了青海湖、扎陵错和纳姆错青藏高原湖面温度的季节和年际变化，并将这些模拟与观测结果进行了比较。结果表明，CLM4.5 湖泊模型模拟很好地再现了青海湖和扎陵错的观测湖面温度，但对南错的再现效果较差。通过详细的分析，我们发现 Nam Co 的模拟偏差主要是由于涡扩散系数的不切实际的参数化造成的。通过扩展该参数，湖面温度模拟得到显着改善。此外，错误的湖冰覆盖模拟导致了寒冷季节模拟的湖面温度偏差。