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首页> 外文期刊>Limnology >Investigation of bathymetry and water quality of Lake Nam Co, the largest lake on the central Tibetan Plateau, China
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Investigation of bathymetry and water quality of Lake Nam Co, the largest lake on the central Tibetan Plateau, China

机译：青藏高原中部最大湖泊纳木错湖的测深和水质调查

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Comprehensive field investigations have been conducted four times on Nam Co, central Tibet, from September 2005 to September 2008. Here, we present the preliminary results focusing on the bathymetric survey and water quality measurements. The isobathic map shows that Nam Co is a high-altitude, deep lake where a flat and large basin lies in the central part with a water depth of more than 90 m. Water depth data from the northwestern bank areas of Nam Co provide unquestionable evidence of rising water levels in the last 3 decades because of the formation of two small islands that were still peninsulas in the 1970s. Water quality measurements taken at 19 stations during three summer field campaigns (2006, 2007 and 2008) covering almost all of the lake areas showed that the temperature, pH, dissolved oxygen and electric conductivity of surface water are on average 11.43A degrees C, 9.21, 8.90 mg l(-1) and 1,851 mu S cm(-1), respectively. The surface water shows no obvious spatial variability among all the stations. Vertical fluctuations of profiles, however, display some differences in thermocline and related parameters, such as pH and dissolved oxygen. According to the vertical variations of water quality parameters, the water column in relatively deep lake areas of Nam Co could be divided into three layers with distinctly various features: the epilimnion is from the surface to about 18-20 m depth in which the parameters are homogeneous with higher temperature and abundant sunlight; the metalimnion ranged from 20-60 m where a thermocline develops; the deepest layer forms a cold and dark hypolimnion.
机译：从2005年9月到2008年9月，已经在西藏中部的Nam Co进行了四次全面的野外调查。在这里，我们介绍的初步结果侧重于测深和水质测量。等压线图显示，Nam Co是一个高海拔深湖，中部有一个平坦而大的盆地，水深超过90 m。 Nam Co西北岸地区的水深数据无疑提供了过去三个十年来水位上升的证据，这是因为形成了两个小岛，这些小岛在1970年代仍是半岛。在三个夏季野外活动（2006年，2007年和2008年）中，对19个站进行了水质测量，这些运动几乎覆盖了整个湖区，表明地表水的温度，pH，溶解氧和电导率平均为11.43A摄氏度，9.21 ，8.90 mg l（-1）和1,851 mu S cm（-1）。在所有站点之间，地表水没有显示出明显的空间变化。然而，剖面的垂直波动在温跃层和相关参数（例如pH和溶解氧）方面显示出一些差异。根据水质参数的垂直变化，可以将Nam Co相对较深的湖区的水柱分为三层，其特征各不相同：上斜是从地表到深度约18-20 m。均质，具有较高的温度和充足的阳光;产生温跃层的金属离子范围为20-60 m;最深的一层形成冷暗的倾斜。

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