Snow Nitrate Isotopes in Central Antarctica Record the Prolonged Period of Stratospheric Ozone Depletion From ∼1960 to 2000

Guitao Shi; Ye Hu; Hongmei Ma; Su Jiang; Zhenlou Chen; Zhengyi Hu; Chunlei An; Bo Sun; Meredith G. Hastings

doi:10.1029/2022GL098986

Snow Nitrate Isotopes in Central Antarctica Record the Prolonged Period of Stratospheric Ozone Depletion From ∼1960 to 2000

Guitao Shi^*
, Ye Hu
, Hongmei Ma
, Su Jiang
, Zhenlou Chen
, Zhengyi Hu
, Chunlei An
, Bo Sun
, Meredith G. Hastings

^*此作品的通讯作者

Ministry of Natural Resources of the People's Republic of China
East China Normal University
Polar Research Institute of China
Brown University

科研成果: 期刊稿件 › 文章 › 同行评审

7 引用（Scopus）

摘要

Interpretation of NO₃⁻ variability recorded in ice cores remains challenging as it can be lost from snow. Here, we present 60-year records of NO₃⁻ and its isotopic composition (δ¹⁵N, δ¹⁸O, and Δ¹⁷O) in snow in central Antarctica, Dome A. In the upper ∼90 cm snowpack, variations in concentration and isotopic composition of NO₃⁻ are dominated by photolytic loss, and δ¹⁸O and Δ¹⁷O of NO₃⁻ are associated with the recycling of NO_x to NO₃⁻ in the condensed phase driven by photolysis. In the deeper snowpack (∼1960–2000), we observe prolonged trends in concentration and isotopic composition of NO₃⁻, which are best explained as enhanced snow NO₃⁻ photolysis due to long-term decreasing total column ozone (TCO). That is, the prolonged period of trends in NO₃⁻ and its isotopes in extremely low snow accumulation sites such as Dome A relay information on variations in TCO and consequently surface solar ultraviolet radiation over time.

源语言	英语
期刊论文编号	e2022GL098986
期刊	Geophysical Research Letters
卷	49
期	13
DOI	https://doi.org/10.1029/2022GL098986
出版状态	已出版 - 16 7月 2022
已对外发布	是

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title = "Snow Nitrate Isotopes in Central Antarctica Record the Prolonged Period of Stratospheric Ozone Depletion From ∼1960 to 2000",

abstract = "Interpretation of NO3− variability recorded in ice cores remains challenging as it can be lost from snow. Here, we present 60-year records of NO3− and its isotopic composition (δ15N, δ18O, and Δ17O) in snow in central Antarctica, Dome A. In the upper ∼90 cm snowpack, variations in concentration and isotopic composition of NO3− are dominated by photolytic loss, and δ18O and Δ17O of NO3− are associated with the recycling of NOx to NO3− in the condensed phase driven by photolysis. In the deeper snowpack (∼1960{\textendash}2000), we observe prolonged trends in concentration and isotopic composition of NO3−, which are best explained as enhanced snow NO3− photolysis due to long-term decreasing total column ozone (TCO). That is, the prolonged period of trends in NO3− and its isotopes in extremely low snow accumulation sites such as Dome A relay information on variations in TCO and consequently surface solar ultraviolet radiation over time.",

keywords = "central Antarctica, ice core nitrate, nitrogen and oxygen isotopes, stratospheric ozone depletion",

author = "Guitao Shi and Ye Hu and Hongmei Ma and Su Jiang and Zhenlou Chen and Zhengyi Hu and Chunlei An and Bo Sun and Hastings, \{Meredith G.\}",

year = "2022",

month = jul,

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doi = "10.1029/2022GL098986",

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volume = "49",

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T1 - Snow Nitrate Isotopes in Central Antarctica Record the Prolonged Period of Stratospheric Ozone Depletion From ∼1960 to 2000

AU - Shi, Guitao

AU - Hu, Ye

AU - Ma, Hongmei

AU - Jiang, Su

AU - Chen, Zhenlou

AU - Hu, Zhengyi

AU - An, Chunlei

AU - Sun, Bo

AU - Hastings, Meredith G.

PY - 2022/7/16

Y1 - 2022/7/16

N2 - Interpretation of NO3− variability recorded in ice cores remains challenging as it can be lost from snow. Here, we present 60-year records of NO3− and its isotopic composition (δ15N, δ18O, and Δ17O) in snow in central Antarctica, Dome A. In the upper ∼90 cm snowpack, variations in concentration and isotopic composition of NO3− are dominated by photolytic loss, and δ18O and Δ17O of NO3− are associated with the recycling of NOx to NO3− in the condensed phase driven by photolysis. In the deeper snowpack (∼1960–2000), we observe prolonged trends in concentration and isotopic composition of NO3−, which are best explained as enhanced snow NO3− photolysis due to long-term decreasing total column ozone (TCO). That is, the prolonged period of trends in NO3− and its isotopes in extremely low snow accumulation sites such as Dome A relay information on variations in TCO and consequently surface solar ultraviolet radiation over time.

AB - Interpretation of NO3− variability recorded in ice cores remains challenging as it can be lost from snow. Here, we present 60-year records of NO3− and its isotopic composition (δ15N, δ18O, and Δ17O) in snow in central Antarctica, Dome A. In the upper ∼90 cm snowpack, variations in concentration and isotopic composition of NO3− are dominated by photolytic loss, and δ18O and Δ17O of NO3− are associated with the recycling of NOx to NO3− in the condensed phase driven by photolysis. In the deeper snowpack (∼1960–2000), we observe prolonged trends in concentration and isotopic composition of NO3−, which are best explained as enhanced snow NO3− photolysis due to long-term decreasing total column ozone (TCO). That is, the prolonged period of trends in NO3− and its isotopes in extremely low snow accumulation sites such as Dome A relay information on variations in TCO and consequently surface solar ultraviolet radiation over time.

KW - central Antarctica

KW - ice core nitrate

KW - nitrogen and oxygen isotopes

KW - stratospheric ozone depletion

UR - https://www.scopus.com/pages/publications/85133926696

U2 - 10.1029/2022GL098986

DO - 10.1029/2022GL098986

M3 - 文章

AN - SCOPUS:85133926696

SN - 0094-8276

VL - 49

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 13

M1 - e2022GL098986

ER -

Snow Nitrate Isotopes in Central Antarctica Record the Prolonged Period of Stratospheric Ozone Depletion From ∼1960 to 2000

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