Influence of dust aerosols on eastern Pacific tropical cyclone intensity

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Zhenxi Zhang
  • Wen Zhou

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number100028
Journal / PublicationAtmospheric and Oceanic Science Letters
Volume14
Issue number3
Online published2 Jan 2021
Publication statusPublished - May 2021

Link(s)

Abstract

The thermodynamic state of the tropical atmosphere plays an important role in the development of tropical cyclone (TC) intensity. This study reports new results that demonstrate a negative association between eastern Pacific TC intensity in offshore regions and dust aerosol optical depth (AOD) for the years 1980–2019. At the same time, a negative response of cloud water in the lower troposphere to dust AOD is reported by analyzing MERRA-2 reanalysis data and GCM simulations from CMIP6. This response can be explained by the dust semi-direct effect, in which dust aerosols absorb solar radiation, promoting the evaporation of clouds. In principle, this aerosol-driven vaporization modification could affect the enthalpy of the air surrounding a TC. Using potential intensity theory, the authors demonstrate that change in TC intensity related to dust AOD conditions is a consequence of the anomalous enthalpy of the air surrounding a TC caused by the dust semi-direct effect.
熱帶地區大氣的熱力學狀態對颱風的發展起著重要作用.本項研究結果表明, 東太平洋颱風強度與沙塵AOD之間存在一定的負相關.同時, MERRA-2再分析資料和CMIP6的GCM模擬的分析結果, 都表明了低層大氣中雲對沙塵AOD的負回應.沙塵顆粒物的准直接輻射效應可以解釋上述回應:沙塵顆粒物吸收太陽輻射, 並用此熱量促進雲層蒸發.理論上, 這種氣溶膠驅動的汽化作用會影響颱風周圍空氣的焓.根據颱風的潛在強度理論, 與沙塵相關的颱風強度變化, 實則是沙塵的准直接輻射效應引起的颱風周圍空氣焓值變化的結果.

Research Area(s)

  • Dust aerosol, Eastern pacific, Potential intensity theory, Semi-direct effect, Tropical cyclone, 东太平洋, 潜在强度理论, 准直接辐射效应, 台风, 沙尘颗粒物, 沙塵顆粒物, 颱風, 東太平洋, 准直接輻射效應, 潛在強度理論

Citation Format(s)

Influence of dust aerosols on eastern Pacific tropical cyclone intensity. / Zhang, Zhenxi; Zhou, Wen.
In: Atmospheric and Oceanic Science Letters, Vol. 14, No. 3, 100028, 05.2021.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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