气候变化领域集成服务门户(CCPortal): COVID-19 lockdowns show reduced pollution on snow and ice in the Indus River Basin

CCPortal

DOI	10.1073/pnas.2101174118
	COVID-19 lockdowns show reduced pollution on snow and ice in the Indus River Basin
	Bair E.; Stillinger T.; Rittger K.; Skiles M.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:18
英文摘要	Melting snow and ice supply water for nearly 2 billion people [J. S. Mankin, D. Viviroli, D. Singh, A. Y. Hoekstra, N. S. Diffenbaugh, Environ. Res. Lett. 10, 114016 (2015)]. The Indus River in South Asia alone supplies water for over 300 million people [S. I. Khan, T. E. Adams, “Introduction of Indus River Basin: Water security and sustainability” in Indus River Basin, pp. 3−16 (2019)]. When light-absorbing particles (LAP) darken the snow/ice surfaces, melt is accelerated, affecting the timing of runoff. In the Indus, dust and black carbon degrade the snow/ice albedos [S. M. Skiles, M. Flanner, J. M. Cook, M. Dumont, T. H. Painter, Nat. Clim. Chang. 8, 964−971 (2018)]. During the COVID-19 lockdowns of 2020, air quality visibly improved across cities worldwide, for example, Delhi, India, potentially reducing deposition of dark aerosols on snow and ice. Mean values from two remotely sensed approaches show 2020 as having one of the cleanest snow/ ice surfaces on record in the past two decades. A 30% LAP reduction in the spring and summer of 2020 affected the timing of 6.6 km3 of melt water. It remains to be seen whether there will be significant reductions in pollution post−COVID-19, but these results offer a glimpse of the link between pollution and the timing of water supply for billions of people. By causing more solar radiation to be reflected, cleaner snow/ice could mitigate climate change effects by delaying melt onset and extending snow cover duration. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	COVID-19; Indus; Light-absorbing particles; Remote sensing; Snow
语种	英语
scopus关键词	ice; snow; aerosol; air quality; Article; climate change; coronavirus disease 2019; deglaciation; India; light absorption; lockdown; pollution control; priority journal; river basin; snow cover; solar radiation; South Asia; spring; summer; water supply; epidemiology; ice cover; isolation and purification; pollution; quarantine; virology; Climate Change; COVID-19; Environmental Pollution; Ice Cover; India; Quarantine; SARS-CoV-2; Snow; Water Supply
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238587
作者单位	Earth Research Institute, University of California, Santa Barbara, CA 93106-3060, United States; Institute for Arctic and Alpine Research, University of Colorado, Boulder, CO 80309-0450, United States; Department of Geography, University of Utah, Salt Lake City, UT 84112, United States
推荐引用方式 GB/T 7714	Bair E.,Stillinger T.,Rittger K.,et al. COVID-19 lockdowns show reduced pollution on snow and ice in the Indus River Basin[J],2021,118(18).
APA	Bair E.,Stillinger T.,Rittger K.,&Skiles M..(2021).COVID-19 lockdowns show reduced pollution on snow and ice in the Indus River Basin.Proceedings of the National Academy of Sciences of the United States of America,118(18).
MLA	Bair E.,et al."COVID-19 lockdowns show reduced pollution on snow and ice in the Indus River Basin".Proceedings of the National Academy of Sciences of the United States of America 118.18(2021).