南极大陆上空碘化学成分的差异

IF 1.5 4区 地球科学 Q3 ECOLOGY
Anoop S. Mahajan , Shrutika Wagh , Rafael P. Fernandez , Surendra Singh , Silvia Bucci , Alfonso Saiz-Lopez
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引用次数: 0

摘要

据报道,南极洲西部上空的碘氧化物(IO)浓度很高,威德尔海周围地区在春季达到峰值。然而,南极洲东部的观测站在夏季显示的数值要低得多,尽管仍然缺少对春季的观测。在此,我们首次使用多轴差分光学吸收光谱仪(MAX-DOAS)对巴拉蒂站(南纬 69.41 度,东经 76.19 度)以外的威德尔海地区进行了长达一年的碘氧化物观测。观测结果表明,即使在春季,碘化学反应也不如威德尔海活跃,在整个日照期间,碘氧化物混合比低于 2 pptv。春季观察到碘氧化物略有增加,但比威德尔海地区低 10 倍。我们利用海冰浓度、海冰厚度和叶绿素浓度确定了不同区域驱动因素的变化。我们使用了一个全球模型,该模型使用了基于这些因素组合的碘排放参数。该模型再现了全年威德尔海上空的高浓度和巴拉蒂上空的低浓度,揭示了南极洲碘的环境因素、来源和化学性质。即使浓度很小,碘也会加剧南极洲东部上空溴化学作用造成的臭氧损失,尽管这种影响低于南极洲西部。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Differences in iodine chemistry over the Antarctic continent

High concentrations of iodine oxide (IO) have been reported over west Antarctica, with areas around the Weddell Sea showing a peak in spring. However, stations in east Antarctica show much lower values during summer, although observations over spring are still missing. Here, we present the first year-long observations of IO outside the Weddell Sea region using a multi-axis differential optical absorption spectrometer (MAX-DOAS) over the Bharati station (69.41°S, 76.19°E). Observations show that iodine chemistry is less active than over the Weddell Sea, even during springtime, with IO mixing ratios below 2 pptv throughout the sunlit period. A slight increase in IO is observed in spring, although it is a factor of 10 lower than the Weddell Sea region. We identify the variations in drivers in the different regions using sea ice concentrations, sea ice thickness and chlorophyll concentrations. We use a global model which uses a parameterization for iodine emissions based on a combination of these factors. The model reproduces the high concentrations over the Weddell Sea and the low concentrations over Bharati throughout the year, shedding light on the environmental factors, sources and chemistry of iodine in Antarctica. Even at small concentrations, iodine can enhance ozone loss caused by bromine chemistry over east Antarctica, although this impact is lower than in the west Antarctic.

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来源期刊
Polar Science
Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
3.90
自引率
5.60%
发文量
46
期刊介绍: Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.
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