气候变化领域集成服务门户(CCPortal): Refractory black carbon (rBC) variability in a 47-year West Antarctic snow and firn core

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DOI	10.5194/tc-14-1537-2020
	Refractory black carbon (rBC) variability in a 47-year West Antarctic snow and firn core
	Marquetto L.; Kaspari S.; Cardia Simões J.
发表日期	2020
ISSN	19940416
起始页码	1537
结束页码	1554
卷号	14 期号:5
英文摘要	Black carbon (BC) is an important climate-forcing agent that affects snow albedo. In this work, we present a record of refractory black carbon (rBC) variability, measured from a 20m deep snow and firn core drilled in West Antarctica (7955034.600 S, 9421013.300W, 2122m above sea level) during the 2014-2015 austral summer. This is the highest elevation rBC record from West Antarctica. The core was analyzed using the Single Particle Soot Photometer (SP2) coupled to a CETAC Marin-5 nebulizer. Results show a welldefined seasonality with geometric mean concentrations of 0.015 ug L1 for the wet season (austral summer-fall) and 0.057 ug L1 for the dry season (austral winter-spring). The core was dated to 47 years (1968-2015) using rBC seasonality as the main parameter, along with sodium (Na), sulfur (S) and strontium (Sr) variations. The annual rBC concentration geometric mean was 0.03 ug L1, the lowest of all rBC cores in Antarctica referenced in this work, while the annual rBC flux was 6.25 ugm2 a1, the lowest flux in West Antarctica rBC records. No long-term trend was observed. Snow albedo reductions at the site due to BC were simulated using SNICAR online and found to be insignificant (0.48 %) compared to clean snow. Fire spot inventory and BC emission estimates from the Southern Hemisphere suggest Australia and Southern Hemisphere South America as the most probable emission sources of BC to the drilling site, whereas HYSPLIT model particle transport simulations from 1968 to 2015 support Australia and New Zealand as rBC sources, with limited contributions from South America. Spectral analysis (REDFIT method) of the BC record showed cycles related to the Antarctic Oscillation (AAO) and to El Nino-Southern Oscillation (ENSO), but cycles in common with the Amundsen Sea Low (ASL) were not detected. Correlation of rBC records in Antarctica with snow accumulation, elevation and distance to the sea suggests rBC transport to East Antarctica is different from transport to West Antarctica. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
英文关键词	albedo; black carbon; dry season; equipment component; geometry; ice core; photometer; refraction; seasonality; snow; soot; spectral analysis; Antarctica; East Antarctica; West Antarctica
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202154
作者单位	Department of Geological Sciences, Central Washington University, Ellensburg, Washington, 98926, United States; Centro Polar e Climático, Universidade Federal Do Rio Grande Do sul, Av, Bento Gonçalves 9500, Porto Alegre, Rio Grande do Sul, CEP, 91509-900, Brazil; Climate Change Institute, University of Maine, Orono, Maine, 04469-5790, United States
推荐引用方式 GB/T 7714	Marquetto L.,Kaspari S.,Cardia Simões J.. Refractory black carbon (rBC) variability in a 47-year West Antarctic snow and firn core[J],2020,14(5).
APA	Marquetto L.,Kaspari S.,&Cardia Simões J..(2020).Refractory black carbon (rBC) variability in a 47-year West Antarctic snow and firn core.Cryosphere,14(5).
MLA	Marquetto L.,et al."Refractory black carbon (rBC) variability in a 47-year West Antarctic snow and firn core".Cryosphere 14.5(2020).