Increasing Arctic dust suppresses the reduction of ice nucleation in the Arctic lower troposphere by warming

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2024-11-01 DOI:10.1038/s41612-024-00811-1

Hitoshi Matsui, Kei Kawai, Yutaka Tobo, Yoshinori Iizuka, Sumito Matoba

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Abstract

Ice nucleating particles (INPs) affect the cloud radiative budget in the rapidly warming Arctic by changing the cloud liquid/ice phase balance. Dust emitted in the Arctic (Arctic dust) has been suggested to be a major contributor to INPs in the Arctic lower troposphere. However, how Arctic dust and its impacts on ice nucleation change with Arctic warming has not been explored. Here we find that the simulated dust emission flux in the Arctic (>60°N) in global model simulations increases by 20% from 1981–1990 to 2011–2020. This increase weakens the sensitivity of ice nucleation in Arctic lower tropospheric clouds to warming by 40% compared to the case without considering Arctic dust emission increases. Our results demonstrate a better understanding of the counterbalancing feedbacks of Arctic dust (i.e., increasing emissions and decreasing ice nucleation efficiency) is needed for more accurate estimates of changes in ice nucleation in the rapidly changing Arctic climate.

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北极尘埃的增加抑制了北极对流层下部因气候变暖而减少的冰核形成

冰核粒子（INPs）通过改变云的液相/冰相平衡来影响迅速变暖的北极地区的云辐射预算。北极地区排放的尘埃（北极尘埃）被认为是造成北极对流层低层 INPs 的主要因素。然而，北极尘埃及其对冰核形成的影响如何随着北极变暖而变化，尚未得到探讨。在这里，我们发现在全球模式模拟中，北极（北纬 60°）的模拟尘埃排放通量从 1981-1990 年到 2011-2020 年增加了 20%。与不考虑北极尘埃排放增加的情况相比，这种增加将北极对流层下部云层的冰核形成对气候变暖的敏感性削弱了 40%。我们的研究结果表明，要更准确地估计北极快速变化的气候中冰核的变化，需要更好地理解北极沙尘的平衡反馈（即增加排放和降低冰核效率）。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.