气候变化领域集成服务门户(CCPortal): Comparison of model and ground observations finds snowpack and blowing snow aerosols both contribute to Arctic tropospheric reactive bromine

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DOI	10.5194/acp-22-14467-2022
	Comparison of model and ground observations finds snowpack and blowing snow aerosols both contribute to Arctic tropospheric reactive bromine
	Swanson, William F.; Holmes, Chris D.; Simpson, William R.; Confer, Kaitlyn; Marelle, Louis; Thomas, Jennie L.; Jaegle, Lyatt; Alexander, Becky; Zhai, Shuting; Chen, Qianjie; Wang, Xuan; Sherwen, Tomas
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	14467
结束页码	14488
卷号	22 期号:22 页码:22
英文摘要	Reactive halogens play a prominent role in the atmospheric chemistry of the Arctic during springtime. Field measurements and modeling studies suggest that halogens are emitted into the atmosphere from snowpack and reactions on wind-blown snow-sourced aerosols. The relative importance of snowpack and blowing snow sources is still debated, both at local scales and regionally throughout the Arctic. To understand the implications of these halogen sources on a pan-Arctic scale, we simulate Arctic reactive bromine chemistry in the atmospheric chemical transport model GEOS-Chem. Two mechanisms are included: (1) a blowing snow sea salt aerosol formation mechanism and (2) a snowpack mechanism assuming uniform molecular bromine production from all snow surfaces. We compare simulations including neither mechanism, each mechanism individually, and both mechanisms to examine conditions where one process may dominate or the mechanisms may interact. We compare the models using these mechanisms to observations of bromine monoxide (BrO) derived from multiple-axis differential optical absorption spectroscopy (MAX-DOAS) instruments on O-Buoy platforms on the sea ice and at a coastal site in Utqiagvik, Alaska, during spring 2015. Model estimations of hourly and monthly average BrO are improved by assuming a constant yield of 0.1 % molecular bromine from all snowpack surfaces on ozone deposition. The blowing snow aerosol mechanism increases modeled BrO by providing more bromide-rich aerosol surface area for reactive bromine recycling. The snowpack mechanism led to increased model BrO across the Arctic Ocean with maximum production in coastal regions, whereas the blowing snow aerosol mechanism increases BrO in specific areas due to high surface wind speeds. Our uniform snowpack source has a greater impact on BrO mixing ratios than the blowing snow source. Model results best replicate several features of BrO observations during spring 2015 when using both mechanisms in conjunction, adding evidence that these mechanisms are both active during the Arctic spring. Extending our transport model throughout the entire year leads to predictions of enhanced fall BrO that are not supported by observations.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000886480900001
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/273846
作者单位	University of Alaska System; University of Alaska Fairbanks; State University System of Florida; Florida State University; University of Washington; University of Washington Seattle; Communaute Universite Grenoble Alpes; Institut National Polytechnique de Grenoble; UDICE-French Research Universities; Sorbonne Universite; Hong Kong Polytechnic University; City University of Hong Kong; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC National Centre for Atmospheric Science; University of York - UK; University of York - UK
推荐引用方式 GB/T 7714	Swanson, William F.,Holmes, Chris D.,Simpson, William R.,et al. Comparison of model and ground observations finds snowpack and blowing snow aerosols both contribute to Arctic tropospheric reactive bromine[J],2022,22(22):22.
APA	Swanson, William F..,Holmes, Chris D..,Simpson, William R..,Confer, Kaitlyn.,Marelle, Louis.,...&Sherwen, Tomas.(2022).Comparison of model and ground observations finds snowpack and blowing snow aerosols both contribute to Arctic tropospheric reactive bromine.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(22),22.
MLA	Swanson, William F.,et al."Comparison of model and ground observations finds snowpack and blowing snow aerosols both contribute to Arctic tropospheric reactive bromine".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.22(2022):22.