气候变化领域集成服务门户(CCPortal): Radiation dimming and decreasing water clarity fuel underwater darkening in lakes

CCPortal

DOI	10.1016/j.scib.2020.06.016
	Radiation dimming and decreasing water clarity fuel underwater darkening in lakes
	Zhang Y.; Qin B.; Shi K.; Zhang Y.; Deng J.; Wild M.; Li L.; Zhou Y.; Yao X.; Liu M.; Zhu G.; Zhang L.; Gu B.; Brookes J.D.
发表日期	2020
ISSN	20959273
起始页码	1675
结束页码	1684
卷号	65 期号:19
英文摘要	Long-term decreases in the incident total radiation and water clarity might substantially affect the underwater light environment in aquatic ecosystems. However, the underlying mechanism and relative contributions of radiation dimming and decreasing water clarity to the underwater light environment on a national or global scale remains largely unknown. Here, we present a comprehensive dataset of unprecedented scale in China's lakes to address the combined effects of radiation dimming and decreasing water clarity on underwater darkening. Long-term total radiation and sunshine duration showed 5.8% and 7.9% decreases, respectively, after 2000 compared to 1961–1970, resulting in net radiation dimming. An in situ Secchi disk depth (SDD) dataset in 170 lakes showed that the mean SDD significantly decreased from 1.80 ± 2.19 m before 1995 to 1.28 ± 1.82 m after 2005. SDD remote sensing estimations for 641 lakes with areas ≥ 10 km2 showed that SDD markedly decreased from 1.26 ± 0.62 m during 1985–1990 to 1.14 ± 0.66 m during 2005–2010. Radiation dimming and decreasing water clarity jointly caused an approximately 10% decrease in the average available photosynthetically active radiation (PAR) in the euphotic layer. Our results revealed a more important role of decreasing water clarity in underwater darkening than radiation dimming. A meta-analysis of long-term SDD observation data from 61 various waters further elucidated a global extensive underwater darkening. Underwater darkening implies a decrease in water quality for potable water supplies, recession in macrophytes and benthic algae, and decreases in benthic primary production, fishery production, and biodiversity. © 2020 Science China Press
关键词	Aquatic ecosystems Radiation dimming Remote sensing Secchi disk depth Underwater darkening
英文关键词	Aquatic ecosystems; Biodiversity; Lakes; Light; Potable water; Remote sensing; Water quality; Water supply; Benthic primary production; Combined effect; Light environment; Observation data; Photosynthetically active radiation; Relative contribution; Remote sensing estimations; Sunshine duration; Radiation effects
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207309
作者单位	Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute for Atmospheric and Climate Science, Zurich, CH-8001, Switzerland; Department of Earth Sciences, Indiana University-Purdue University, Indianapolis, IN 46202, United States; Soil and Water Science Department, University of Florida, Gainesville, FL 32611, United States; Water Research Centre, Environment Institute, School of Biological Science, University of Adelaide, Adelaide, 5005, Australia
推荐引用方式 GB/T 7714	Zhang Y.,Qin B.,Shi K.,et al. Radiation dimming and decreasing water clarity fuel underwater darkening in lakes[J],2020,65(19).
APA	Zhang Y..,Qin B..,Shi K..,Zhang Y..,Deng J..,...&Brookes J.D..(2020).Radiation dimming and decreasing water clarity fuel underwater darkening in lakes.Science Bulletin,65(19).
MLA	Zhang Y.,et al."Radiation dimming and decreasing water clarity fuel underwater darkening in lakes".Science Bulletin 65.19(2020).