气候变化领域集成服务门户(CCPortal): Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS

CCPortal

DOI	10.1016/j.rse.2020.111949
	Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS
	Wang, Shenglei; Li, Junsheng; Zhang, Bing; Lee, Zhongping; Spyrakos, Evangelos; Feng, Lian; Liu, Chong; Zhao, Hongli; Wu, Yanhong; Zhu, Liping; Jia, Liming; Wan, Wei; Zhang, Fangfang; Shen, Qian; Tyler, Andrew N.; Zhang, Xianfeng
通讯作者	Zhang, B (通讯作者)
发表日期	2020
ISSN	0034-4257
EISSN	1879-0704
卷号	247
英文摘要	Water clarity is a well-established first-order indicator of water quality and has been used globally by water regulators in their monitoring and management programs. Assessments of water clarity in lakes over large temporal and spatial scales, however, are rare, limiting our understanding of its variability and the driven forces. In this study, we developed and validated a robust Secchi disk depth (Z(SD)) algorithm for lakes across China based on two water color parameters, namely Forel-Ule Index (FUI) and hue angle alpha, retrieved from MODIS data. The MODIS Z(SD) model shows good results when compared with in-situ measurements from 17 lakes, with a 27.4% mean relative difference (MRD) in the validation dataset. Compared with other empirical Z(SD) models, our FUI and alpha-based model demonstrates improved performance and adaptability over a wide range of water clarity and trophic states. This algorithm was subsequently applied to MODIS measurements to provide a comprehensive assessment of water clarity in large lakes (N = 153) across China for the first time. The mean summer Z(SD) of the studied lakes between 2000 and 2017 demonstrated marked spatial and temporal variations. Spatially, the Z(SD) of large lakes presented a distinct spatial pattern of high west and low east over China. This spatial pattern was found to be associated with the significant differences in lake depth and altitude between west and east China while China's population, GDP, temperature, and precipitation distribution have also contributed to a certain extent. Temporally, the Z(SD) of most lakes increased during this period, with an overall mean rate of 3.3 cm/yr for all lakes. Here, 38.6% (N = 59) of the lakes experienced a significant increase in their Z(SD) value during the past 18 years while only 8.5% (N = 13) showed a significant decreasing trend. Significant increases in lake Z(SD) were observed in west China, which were found to correlate with the increase of air temperature and lake surface area. This is possibly a response of the lakes in west China to climate change. In the lake systems of east China, which are predominately used as a drinking water source, the increase in lake Z(SD) was found to be strongly correlated with changes in local GDP (gross domestic production), NDVI (normalized difference vegetation index) and lake surface area, suggesting a combined effect of the implemented management practices and climatic variability. The results of this study provide important information for water quality conservation and management in China, and also highlight the value of satellite remote sensing in monitoring water quality over lakes at a large scale and long-term.
关键词	INLAND WATERS LANDSAT 8 COASTAL COLOR REFLECTANCE QUALITY TRANSPARENCY SENTINELS TURBIDITY RETRIEVAL
英文关键词	Secchi disk depth; Lakes and reservoirs; MODIS; FUI; Hue angle; Water clarity changes
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
WOS类目	Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:000549189200047
来源期刊	REMOTE SENSING OF ENVIRONMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260079
推荐引用方式 GB/T 7714	Wang, Shenglei,Li, Junsheng,Zhang, Bing,et al. Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS[J]. 中国科学院青藏高原研究所,2020,247.
APA	Wang, Shenglei.,Li, Junsheng.,Zhang, Bing.,Lee, Zhongping.,Spyrakos, Evangelos.,...&Zhang, Xianfeng.(2020).Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS.REMOTE SENSING OF ENVIRONMENT,247.
MLA	Wang, Shenglei,et al."Changes of water clarity in large lakes and reservoirs across China observed from long-term MODIS".REMOTE SENSING OF ENVIRONMENT 247(2020).