Water clarity changes in 64 large alpine lakes on the Tibetan Plateau and the potential responses to lake expansion

Pi，Xuehui1,2; Feng，Lian1; Li，Weifeng2; Zhao，Dan1; Kuang，Xingxing1; Li，Junsheng3

2020-12-01

10.1016/j.isprsjprs.2020.10.014

ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING   影响因子和分区

0924-2716

1872-8235

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 (Z) retrieval model and used the proposed model to study the temporal and spatial dynamics of water clarity in 64 lakes (>50 km) located on the TP during the 2003–2018 period. The results show that the 64 lakes have an average long-term mean Z of 4.4 ± 3.0 m, where lakes in the northern TP generally exhibited lower Z levels than those located in the southern and northeastern parts of the TP. Among all selected lakes, the number of lakes showing (significantly) decreasing Z 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 Z and environmental factors suggests that lake expansion is an essential factor affecting the increase in lake Z, while such an impact may be offset by the increase in phytoplankton induced by climate change in lakes showing a significant Z decreasing trend. In addition, land use types are partially responsible for the Z disparities between different lakes since lakes with high Z 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.

Alpine lake Inland water MODIS Secchi disk depth Tibetan Plateau Water clarity

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[41971304][91747204][41671338] ; Shenzhen Science and Technology Innovation Committee[JCYJ20190809155205559] ; High-level Special Funding of the Southern University of Science and Technology[G02296302][G02296402]

Physical Geography ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology

Geography, Physical ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology

WOS:000592242600014

ELSEVIER

20204509448769

Land use ; Water quality ; Climate change ; Radiometers ; Ecology ; Expansion

Urban and Regional Planning and Development:403 ; Atmospheric Properties:443.1 ; Water Analysis:445.2 ; Ecology and Ecosystems:454.3 ; Radiation Measuring Instruments:944.7 ; Materials Science:951

GEOSCIENCES

2-s2.0-85094814354

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.Department of Urban Planning and Design,The University of Hong Kong,Hong Kong
3.Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing,China

Pi，Xuehui,Feng，Lian,Li，Weifeng,et al. Water clarity changes in 64 large alpine lakes on the Tibetan Plateau and the potential responses to lake expansion[J]. ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING,2020,170:192-204.

Pi，Xuehui,Feng，Lian,Li，Weifeng,Zhao，Dan,Kuang，Xingxing,&Li，Junsheng.(2020).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,170,192-204.

Pi，Xuehui,et al."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 170(2020):192-204.