气候变化领域集成服务门户(CCPortal): Numerical Study of the Thermal Structure and Circulation in a Large anal Deep Dimictic Lake Over Tibetan Plateau

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DOI	10.1029/2021JC017517
	Numerical Study of the Thermal Structure and Circulation in a Large anal Deep Dimictic Lake Over Tibetan Plateau
	Wu, Yang; Huang, Anning; Lu, Youyu; Lazhu; Yang, Xianyu; Qiu, Bo; Zhang, Zhiqi; Zhang, Xindan
通讯作者	Huang, AN (通讯作者)
发表日期	2021
ISSN	2169-9275
EISSN	2169-9291
卷号	126 期号:10
英文摘要	A three-dimensional (3-D) hydrodynamic model based on the Princeton Ocean Model (POM) was applied to simulate the thermal structure and circulation of Lake Nam Co (LNC), the third largest lake over the Tibetan Plateau (TP), during May-December 2013. Compared with a spatially distributed set of one-dimensional thermal diffusion lake models, POM better reproduced the observed seasonal evolution of the horizontal distribution of lake surface temperature and the vertical thermal structure. A heat budget analysis confirmed that the lateral heat exchange made significant contributions to the horizontal variability of lake temperature. The model results showed that LNC was thermally stratified in summer, had a weak inverse stratification since mid-December, and was fully turned over during late spring and autumn. During both overturning phases, the modeled thermal bar was developed as a result of the density-driven convection in response to the radiative heating (surface cooling) during spring (autumn). The 3-D model results showed that the monthly mean circulation featured a predominant mid-lake cyclonic gyre throughout the ice-free period; upwelling along the western coast and strong coastal currents occurred in all months except in July-August. Model sensitivity experiments confirmed that the lake circulation was primarily driven by the barotropic dynamics of the prevailing southwesterly wind, while the baroclinic process made a secondary contribution. The results pointed out the necessity to resolve lateral processes when modeling large TP lakes. Plain Language Summary The Tibetan Plateau has the highest alpine lake concentration in the world and Lake Nam Co is the third largest lake in the region. This study showed that a three-dimensional (3-D) hydrodynamic model performed better than a spatially distributed set of one-dimensional thermal diffusion lake models in reproducing the observed spatial and temporal variations of the lake temperature, and depicted the existence of lake gyre circulation, coastal currents, and upwelling. Model sensitivity experiments revealed that the lake circulation during the ice-free season was primarily driven by the prevailing southwesterly wind, while the thermal structure made a secondary contribution. The improved simulation of the thermal structure and circulation with 3-D models is important to understand the variations of the ecosystem in large lakes and the impacts of lakes on the regional weather and climate.
关键词	REGIONAL CLIMATE NAM CO CYCLONIC CIRCULATION HYDRODYNAMIC MODEL WATER TEMPERATURE GREAT-LAKES BAR IMPACT PERFORMANCE SIMULATION
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000714344600015
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260300
推荐引用方式 GB/T 7714	Wu, Yang,Huang, Anning,Lu, Youyu,et al. Numerical Study of the Thermal Structure and Circulation in a Large anal Deep Dimictic Lake Over Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,126(10).
APA	Wu, Yang.,Huang, Anning.,Lu, Youyu.,Lazhu.,Yang, Xianyu.,...&Zhang, Xindan.(2021).Numerical Study of the Thermal Structure and Circulation in a Large anal Deep Dimictic Lake Over Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(10).
MLA	Wu, Yang,et al."Numerical Study of the Thermal Structure and Circulation in a Large anal Deep Dimictic Lake Over Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.10(2021).