Evaluation of 10-m Wind Speed From ISD Meteorological Stations and the MERRA-2 Reanalysis: Impacts on Dust Emission in the Arabian Peninsula

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Journal of Geophysical Research: Atmospheres Pub Date : 2024-10-30 DOI:10.1029/2024JD040885
E. Faber, A. Rocha-Lima, P. Colarco, B. Baker
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Abstract

Mineral dust is one of the most important aerosols when studying the radiative balance and climate of the planet. There are different dust emission schemes utilized by the atmospheric modeling communities, many of which disagree on basic output quantities such as mass of dust emitted and distribution of mass among size bins. In this work, we examined mineral dust emission from a leading model scheme, the Goddard Chemistry Aerosol Radiation and Transport (GOCART), as utilized in the Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) Reanalysis and compared it to dust emissions calculated using wind measurements from ground based weather stations located in the Arabian Peninsula that are included in the National Oceanic and Atmospheric Administration’s (NOAA) integrated surface database (ISD). An intercomparison of 10-m wind speed is shown for the Arabian Peninsula region, differences of the observed and modeled wind field are quantified, and impacts of differences on dust emissions are calculated. This analysis shows 10-m winds in the ISD were generally lower than MERRA-2 winds, which propagated to dust emissions errors. Our estimate of one of the most significant mass impacts in dust emission is 0.178 Tg/year/grid box with a percent change of over 200% to the recalculated dust emissions from MERRA-2. These differences in wind speed propagated to a difference in dust mass emitted by the use of a static source function which aids in scaling the mass emitted by the availability of dust in each grid. Additionally, the magnitude of these differences varies seasonally.

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来自 ISD 气象站和 MERRA-2 再分析的 10 米风速评估:对阿拉伯半岛沙尘排放的影响
矿物尘埃是研究地球辐射平衡和气候时最重要的气溶胶之一。大气建模界使用了不同的粉尘排放方案,其中许多方案在基本输出量上存在分歧,如排放的粉尘质量和质量在不同粒径箱中的分布。在这项工作中,我们研究了现代研究和应用回顾分析第 2 版(MERRA-2)再分析中使用的一种主要模式方案--戈达德化学气溶胶辐射和传输(GOCART)--的矿物尘埃排放,并将其与利用美国国家海洋和大气管理局(NOAA)综合地表数据库(ISD)中包含的阿拉伯半岛地面气象站风力测量数据计算的尘埃排放进行了比较。显示了阿拉伯半岛地区 10 米风速的相互比较,量化了观测风场和模拟风场的差异,并计算了差异对沙尘排放的影响。分析表明 ISD 中的 10 米风速普遍低于 MERRA-2 风速,这导致了沙尘排放误差。根据我们的估算,粉尘排放中最重要的质量影响之一是 0.178 吨/年/网格框,与 MERRA-2 重新计算的粉尘排放相比,百分比变化超过 200%。通过使用静态源函数,这些风速上的差异会传播到粉尘排放质量上的差异,该函数有助于根据每个网格中粉尘的可用性对排放质量进行缩放。此外,这些差异的大小随季节而变化。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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