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Water clarity changes in 64 large alpine lakes on the Tibetan Plateau and the potential responses to lake expansion
ISPRS Journal of Photogrammetry and Remote Sensing ( IF 12.7 ) Pub Date : 2020-11-02 , DOI: 10.1016/j.isprsjprs.2020.10.014
Xuehui Pi , Lian Feng , Weifeng Li , Dan Zhao , Xingxing Kuang , Junsheng Li

Lakes are essential components of the water cycle and ecosystems. Therefore, the ecology and water security of lakes is of great concern. However, on the Tibetan Plateau (TP), which is known as the Asian water tower, knowledge of lake water quality is in its infancy. In this study, we developed a Moderate Resolution Imaging Spectroradiometer (MODIS)-based Secchi disk depth (Zsd) retrieval model and used the proposed model to study the temporal and spatial dynamics of water clarity in 64 lakes (>50 km2) located on the TP during the 2003–2018 period. The results show that the 64 lakes have an average long-term mean Zsd of 4.4 ± 3.0 m, where lakes in the northern TP generally exhibited lower Zsd levels than those located in the southern and northeastern parts of the TP. Among all selected lakes, the number of lakes showing (significantly) decreasing Zsd change trends was approximate to those showing (significantly) increasing change trends. Nevertheless, the two trends exhibited different spatial patterns. An analysis of the potential links between lake Zsd and environmental factors suggests that lake expansion is an essential factor affecting the increase in lake Zsd, while such an impact may be offset by the increase in phytoplankton induced by climate change in lakes showing a significant Zsd decreasing trend. In addition, land use types are partially responsible for the Zsd disparities between different lakes since lakes with high Zsd commonly occurred with high vegetation cover in their surrounding areas, while glacial melting and hydrological networks showed minor influences. This study is expected to enhance our understanding of lacustrine environments in TP and other global alpine lakes under the scenario of climate change.



中文翻译:

青藏高原64个大型高山湖泊的水净度变化及其对湖泊扩张的潜在响应

湖泊是水循环和生态系统的重要组成部分。因此,湖泊的生态和水安全问题备受关注。然而,在被称为亚洲水塔的青藏高原(TP)上,对湖泊水质的了解还处于起步阶段。在这项研究中,我们开发了基于中等分辨率成像光谱仪(MODIS)的Secchi盘深度(Z sd)检索模型,并使用该模型研究了位于64个湖泊(> 50 km 2)中水的净度的时空动态。在2003-2018年期间的目标价格上。结果表明,这64个湖泊的平均长期平均Z sd为4.4±3.0 m,而TP北部的湖泊通常表现出较低的Z sd。比位于TP南部和东北部的水平高。在所有选定的湖泊中,显示(显着)下降的Z sd变化趋势的湖泊数量近似于显示(显着)上升的变化趋势的湖泊数量。然而,这两种趋势表现出不同的空间格局。对Z sd湖泊与环境因素之间潜在联系的分析表明,湖泊扩张是影响Z sd湖泊增加的重要因素,而这种影响可能会因气候变化导致湖泊中浮游植物增加而被抵消,这表明Z sd呈下降趋势。此外,土地使用类型是Z sd的部分原因Z sd高的湖泊通常发生在周围地区植被覆盖较高的地区,而湖泊之间的差异较大,而冰川融化和水文网络显示的影响较小。在气候变化的情况下,这项研究有望增进我们对TP和其他全球高山湖泊湖环境的了解。

更新日期:2020-11-02
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