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

^*Corresponding author for this work

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

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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 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.

Original language	English
Article number	e2022GL098986
Journal	Geophysical Research Letters
Volume	49
Issue number	13
DOIs	https://doi.org/10.1029/2022GL098986
State	Published - 16 Jul 2022
Externally published	Yes

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SDG 12 Responsible Consumption and Production

Keywords

central Antarctica
ice core nitrate
nitrogen and oxygen isotopes
stratospheric ozone depletion

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10.1029/2022GL098986

Cite this

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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.\}",

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month = jul,

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doi = "10.1029/2022GL098986",

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journal = "Geophysical Research Letters",

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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

Abstract

UN SDGs

Keywords

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