Bathymetric survey and modern limnological parameters of Nam Co,central Tibet
Bathymetric survey and modern limnological parameters of Nam Co,central Tibet
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DOI：
10.18307/2009.0117
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Wang Junbo;Zhu Liping;Daut Gerhard;Ju Jianting;Lin Xiao;W. Yong;Zheng Xiaolin
中科院分区：
文献类型：
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作者：
Wang Junbo;Zhu Liping;Daut Gerhard;Ju Jianting;Lin Xiao;W. Yong;Zheng Xiaolin
对纳木错进行了三次全面的实地调查，2005年西藏中部地区-本文介绍了纳木错的水深测量和水质监测的初步结果。湖心水图显示纳木错是一个高海拔深湖，中部为一个平坦的大盆地，水深超过90 m。纳木错西北岸水深资料提供了纳木错的主要特征。20世纪70年代两个半岛形成后，近30年来湖泊水位上升，这是一个不争的事实。覆盖湖泊面积一半以上的16个监测站的水质结果表明，湖泊表层水温、pH、溶解氧、电导率和光合有效辐射（PAR）的平均值分别为11.63℃、9.13、7.93mg/L，根据水质参数的垂向变化，纳木错较深湖区的水体可分为3层，各层特征明显：第一层为表层至18~ 20 m深度，温度较高，光照充足，参数稳定;第二层约20 ~ 60 m，温跃层发育，最底层也很稳定，温度低，无光，形成一个寒冷黑暗的水下世界。
Comprehensive field investigations had been conducted for three times on Nam Co,central Tibet during 2005-2007.Here we presented the preliminary results focusing on bathymetric survey and water quality measurements.Isnbathic map showed that Nam Co is a high altitude deep lake where a fiat and large basin lies in the central part with more than 90m water depth.Data on water depth in northwestern bank areas of Nam Co provided unquestionable evidence for water level rising in the recent three decades due to the formation of two small islands which were peninsulas in 1970s.Water quality at 16 stations covering more than half of the whole lake showed that temperature,pH,dissolved oxygen,conductivity and photosynthetically active radiation(PAR)of surface water was averagely 11.63℃,9.13,7.93mg/L,1839μS/cm and 2582p.mol/(s·m~2),respectively.According to the vertical variations of water quality parameters,water column in relatively deep lake areas of Nam Co could be divided into three layers with distinctly various features.The first layer was from surface to about 18～20m depth in which parameters was stable with higher temperature and abundant sunlight;the second layer ranged about 20m to 60m where thermocline developed;and the bottommost layer was characterized as also very stable with low temperature and no light,forming a cold and dark underwater world.