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Three-Year Observations of Ozone Columns over Polar Vortex Edge Area above West Antarctica

Abstract

Ozone vertical column densities (VCDs) were retrieved by Zenith Scattered Light-Differential Optical Absorption Spectroscopy (ZSL-DOAS) from January 2017 to February 2020 over Fildes Peninsula, West Antarctica (62.22°S, 58.96°W). Each year, ozone VCDs started to decline around July with a comparable gradient around 1.4 Dobson Units (DU) per day, then dropped to their lowest levels in September and October, when ozone holes appeared (less than 220 DU). Daily mean values of retrieved ozone VCDs were compared with Ozone Monitoring Instrument (OMI) and Global Ozone Monitoring Experiment 2 (GOME-2) satellite observations and the Modern-Era Retrospective analysis for Research and Applications Version 2 (MERRA-2) reanalysis dataset, with correlation coefficients (R2) of 0.86, 0.94, and 0.90, respectively. To better understand the causes of ozone depletion, the retrieved ozone VCDs, temperature, and potential vorticity (PV) at certain altitudes were analyzed. The profiles of ozone and PV were positively correlated during their fluctuations, which indicates that the polar vortex has a strong influence on stratospheric ozone depletion during Antarctic spring. Located at the edge of polar vortex, the observed data will provide a basis for further analysis and prediction of the inter-annual variations of stratospheric ozone in the future.

摘 要

利用天顶散射光差分吸收光谱技术(ZSL-DOAS),观测了2017年1月至2020年2月西南极菲尔德斯半岛(62.22°S, 58.96°W)上空的臭氧垂直柱浓度(VCD)。结果显示,臭氧VCD在每年的7月以每天1.4 DU的梯度下降,在9-10月下降至最低水平,并出现臭氧空洞(臭氧VCD小于220 DU)。将地基反演的臭氧VCD每日均值与OMI、GOME-2卫星观测结果和MERRA-2再分析数据进行对比,相关性(R2)分别为0.86、0.94与0.90。为了进一步探究臭氧损耗成因,对臭氧VCD、温度与位涡(PV)进行了分析。结果显示,在臭氧波动期间,臭氧与PV的垂直廓线呈现正相关趋势,这表明在南极春季极涡对平流层臭氧的损耗有关键的影响。由于观测站点位于极涡边界区域,该站点的持续观测数据将为臭氧损耗的进一步分析和平流层臭氧的年际变化预测提供依据。

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 41676184 and 41941011). The authors gratefully acknowledge ECMWF (https://doi.org/https://www.ecmwf.int/) for providing ERA-Interim reanalysis data and GES-DISC (https://doi.org/https://disc.gsfc.nasa.gov/) for providing MERRA-2 data. The authors thank the staff of Great Wall Station for their kind help. The authors acknowledge three anonymous referees for their help on the improvement of the manuscript.

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Correspondence to Yuhan Luo.

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Article Highlights

• The ozone VCDs retrieved by ground-based ZSL-DOAS indicated that ozone holes appeared over the Fildes Peninsula, West Antarctica, with sharp fluctuations during the spring.

• The polar vortex has a strong influence on stratospheric ozone depletion during Antarctic spring.

• The ozone VCDs from ground-based observations validate satellite observations over the Fildes Peninsula.

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Qian, Y., Luo, Y., Si, F. et al. Three-Year Observations of Ozone Columns over Polar Vortex Edge Area above West Antarctica. Adv. Atmos. Sci. 38, 1197–1208 (2021). https://doi.org/10.1007/s00376-021-0243-7

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  • DOI: https://doi.org/10.1007/s00376-021-0243-7

Key words

  • ozone VCDs
  • ZSL-DOAS
  • Antarctic ozone depletion
  • polar vortex

关键词

  • 臭氧垂直柱浓度
  • 天顶散射光差分吸收光谱技术
  • 南极臭氧损耗
  • 极涡