气候变化领域集成服务门户(CCPortal): Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica

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DOI	10.5194/acp-20-5861-2020
	Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica
	Holly L. Winton V.; Ming A.; Caillon N.; Hauge L.; E. Jones A.; Savarino J.; Yang X.; M. Frey M.
发表日期	2020
ISSN	1680-7316
起始页码	5861
结束页码	5885
卷号	20 期号:9
英文摘要	The nitrogen stable isotopic composition in nitrate (δ15N-No-3 ) measured in ice cores from low-snowaccumulation regions in East Antarctica has the potential to provide constraints on past ultraviolet (UV) radiation and thereby total column ozone (TCO) due to the sensitivity of nitrate (No-3 ) photolysis to UV radiation. However, understanding the transfer of reactive nitrogen at the air snow interface in polar regions is paramount for the interpretation of ice core records of δ15N-No-3 and No-3 mass concentrations. As No-3 undergoes a number of post-depositional processes before it is archived in ice cores, site-specific observations of δ15N-No-3 and air snow transfer modelling are necessary to understand and quantify the complex photochemical processes at play. As part of the Isotopic Constraints on Past Ozone Layer Thickness in Polar Ice (ISOLICE) project, we report new measurements of No-3 mass concentration and δ15N-No-3 in the atmosphere, skin layer (operationally defined as the top 5mm of the snowpack), and snow pit depth profiles at Kohnen Station, Dronning Maud Land (DML), Antarctica. We compare the results to previous studies and new data, presented here, from Dome C on the East Antarctic Plateau. Additionally, we apply the conceptual 1D model of TRansfer of Atmospheric Nitrate Stable Isotopes To the Snow (TRANSITS) to assess the impact of No-3 recycling on δ15N-No-3 and No-3 mass concentrations archived in snow and firn. We find clear evidence of No-3 photolysis at DML and confirmation of previous theoretical, field, and laboratory studies that UV photolysis is driving No-3 recycling and redistribution at DML. Firstly, strong denitrification of the snowpack is observed through the δ15N-No-3 signature, which evolves from the enriched snowpack (?3 to 100 ), to the skin layer (?20 to 3 ), to the depleted atmosphere (?50 to ?20 ), corresponding to mass loss of No-3 from the snowpack. Based on the TRANSITS model, we find that No-3 is recycled two times, on average, before it is archived in the snowpack below 15 cm and within 0.75 years (i.e. below the photic zone). Mean annual archived δ15N-No-3 and No-3 mass concentration values are 50 and 60 ng g?1, respectively, at the DML site.We report an e-folding depth (light attenuation) of 2 5 cm for the DML site, which is considerably lower than Dome C. A reduced photolytic loss of No-3 at DML results in less enrichment of δ15N-No-3 than at Dome C mainly due to the shallower e-folding depth but also due to the higher snow accumulation rate based on TRANSITS-modelled sensitivities. Even at a relatively low snow accumulation rate of 6 cm yr?1 (water equivalent; w.e.), the snow accumulation rate at DML is great enough to preserve the seasonal cycle of No-3 mass concentration and δ15N-No-3 , in contrast to Dome C where the depth profiles are smoothed due to longer exposure of surface snow layers to incoming UV radiation before burial. TRANSITS sensitivity analysis of δ15N-No-3 at DML highlights that the dominant factors controlling the archived δ15N-No-3 signature are the e-folding depth and snow accumulation rate, with a smaller role from changes in the snowfall timing and TCO. Mean TRANSITS model sensitivities of archived δ15N-No-3 at the DML site are 100 for an e-folding depth change of 8 cm, 110 for an annual snow accumulation rate change of 8.5 cm yr?1 w.e., 10 for a change in the dominant snow deposition season between winter and summer, and 10 for a TCO change of 100DU (Dobson units). Here we set the framework for the interpretation of a 1000-year ice core record of δ15N-No-3 from DML. Ice core δ15N-No-3 records at DML will be less sensitive to changes in UV than at Dome C; however the higher snow accumulation rate and more accurate dating at DML allows for higher-resolution δ15N-No-3 records. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	air-snow interaction; atmospheric chemistry; concentration (composition); isotopic composition; nitrate; photolysis; recycling; seasonal variation; snow accumulation; stable isotope; Antarctica; East Antarctica; Queen Maud Land
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/247774
作者单位	British Antarctic Survey, CambridgeCB3 0ET, United Kingdom; University of Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, 38000, France
推荐引用方式 GB/T 7714	Holly L. Winton V.,Ming A.,Caillon N.,et al. Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica[J],2020,20(9).
APA	Holly L. Winton V..,Ming A..,Caillon N..,Hauge L..,E. Jones A..,...&M. Frey M..(2020).Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(9).
MLA	Holly L. Winton V.,et al."Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.9(2020).