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Summertime Thermally-Induced Circulations over the lake nam co Region of the Tibetan Plateau

Journal of Meteorological Research 2015年第2期29卷 305-314页

作者：杨显玉吕雅琼马耀明文军 cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences School of Engineering University of CaliforniaMerced CA 95344 USA Institute of Tibetan Plateau Research Chinese Academy of Sciences

Performance of the fifth-generation Pennsylvania State University/National Center for Atmospheric Research Mesoscale Model（MM5） over the lake nam co region of the Tibetan Plateau was evaluated based on the data from five surface observation sites in 2006. The interaction between two thermally-induced circulations（lake breezes and mountain-valley winds） was also investigated. The results show that MM5 could be used to simulate 2-m air temperature; however, MM5 needs improvement in wind field *** numerical simulations were conducted to study the effect of the lake on the local weather and wind system. The original land cover of the model was used in the control experiment, and the lake was replaced with grassland resembling the area surrounding the lake in the sensitive experiment. The results of the simulations indicate that the lake enhanced the north slope mountain-valley wind and the mountain changed the offshore flow direction at the north shore. During the day, a clear convergent zone and a strong upflow were observed over the north slope of the Nyainq？entanglha Range, which may cause frequent precipitation over the north slope. During the night, the entire area was controlled by a south flow.

关键词： lake nam co MM5 lake breeze mountain-valley wind

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A note on the lake level variations of nam co,south-central Tibetan Plateau from 2005 to 2019

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Research in cold and Arid Regions 2020年第6期12卷 430-435页

作者： ShiQiao Zhou Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Tibetan lake levels are sensitive to global change,and their variations have a large impact on the environment,local agriculture and animal husbandry *** many remote sensing data of Tibetan lake level changes have been reported,few are from in-situ *** note presents the first in-situ lake level time series of the central Tibetan *** 2005,daily lake level observations have been performed at lake nam co,one of the largest on the Tibetan *** interannual lake level variations show an overall increasing trend from 2006 to 2014,a rapid decrease from 2014 to 2017,and a surge from 2017 to *** annual average lake level of the hydrological year(May−April)rose 66 cm from 2006 to 2014,dropped 59 cm from 2014 to 2017,and increased 20 cm from 2017 to 2018,resulting in a net rise of 27 cm or an average rate of about 2 cm per *** to the annual average lake level based on the calendar year,it is better to use the annual average lake level based on the hydrological year to determine the interannual lake level *** the lake level was stable in May,it is appropriate to compare May lake levels when examining interannual lake level changes with fewer ***,remote sensing results agree well with the in-situ lake level observations;however,some significant deviations *** the comparable 2006−2009 period,the calendar-year average lake level observed insitu rose by 10−11 cm per year,which is lower than the ICESat result of 18 cm per year.

关键词： lake nam co lake level change in-situ measurement Tibetan Plateau

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