气候变化领域集成服务门户(CCPortal): Deposition of light-Absorbing particles in glacier snow of the sunderdhunga valley, the southern forefront of the central himalayas

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DOI	10.5194/acp-21-2931-2021
	Deposition of light-Absorbing particles in glacier snow of the sunderdhunga valley, the southern forefront of the central himalayas
	Svensson J.; Ström J.; Honkanen H.; Asmi E.; B. Dkhar N.; Tayal S.; P. Sharma V.; Hooda R.; Leppäranta M.; Jacobi H.-W.; Lihavainen H.; Hyvärinen A.
发表日期	2021
ISSN	1680-7316
起始页码	2931
结束页码	2943
卷号	21 期号:4
英文摘要	Anthropogenic activities on the Indo-Gangetic Plain emit vast amounts of light-Absorbing particles (LAPs) into the atmosphere, modifying the atmospheric radiation state. With transport to the nearby Himalayas and deposition to its surfaces the particles contribute to glacier melt and snowmelt via darkening of the highly reflective snow. The central Himalayas have been identified as a region where LAPs are especially pronounced in glacier snow but still remain a region where measurements of LAPs in the snow are scarce. Here we study the deposition of LAPs in five snow pits sampled in 2016 (and one from 2015) within 1 km from each other from two glaciers in the Sunderdhunga Valley, in the state of Uttarakhand, India, in the central Himalayas. The snow pits display a distinct enriched LAP layer interleaved by younger snow above and older snow below. The LAPs exhibit a distinct vertical distribution in these different snow layers. For the analyzed elemental carbon (EC), the younger snow layers in the different pits show similarities, which can be characterized by a deposition constant of about 50 μg m-2 mm-1 snow water equivalent (SWE), while the old-snow layers also indicate similar values, described by a deposition constant of roughly 150 μg m-2 mm-1 SWE. The enriched LAP layer, contrarily, displays no similar trends between the pits. Instead, it is characterized by very high amounts of LAPs and differ in orders of magnitude for concentration between the pits. The enriched LAP layer is likely a result of strong melting that took place during the summers of 2015 and 2016, as well as possible lateral transport of LAPs. The mineral dust fractional absorption is slightly below 50 % for the young-and old-snow layers, whereas it is the dominating light-Absorbing constituent in the enriched LAP layer, thus, highlighting the importance of dust in the region. Our results indicate the problems with complex topography in the Himalayas but, nonetheless, can be useful in large-scale assessments of LAPs in Himalayan snow. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	absorption; atmospheric deposition; concentration (composition); enrichment; glacier; mineral dust; snowmelt; Gangetic Plain; Himalayas; India; Uttarakhand
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247111
作者单位	Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, Finland; Université Grenoble Alpes, CNRS, IRD, INP-G, IGE, Grenoble, France; Department of Environmental Science, Stockholm University, Stockholm, Sweden; Institute for Atmospheric and Earth System Research, Faculty of Science, University of Helsinki, Helsinki, Finland; Energy and Resource Institute (TERI), New Delhi, India; TERI School of Advanced Studies (TERI SAS), New Delhi, India; Svalbard Integrated Arctic Earth Observing System, Longyearbyen, Norway
推荐引用方式 GB/T 7714	Svensson J.,Ström J.,Honkanen H.,et al. Deposition of light-Absorbing particles in glacier snow of the sunderdhunga valley, the southern forefront of the central himalayas[J],2021,21(4).
APA	Svensson J..,Ström J..,Honkanen H..,Asmi E..,B. Dkhar N..,...&Hyvärinen A..(2021).Deposition of light-Absorbing particles in glacier snow of the sunderdhunga valley, the southern forefront of the central himalayas.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Svensson J.,et al."Deposition of light-Absorbing particles in glacier snow of the sunderdhunga valley, the southern forefront of the central himalayas".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).