Changes in the surface irradiance during the total solar eclipse 2020 in Valcheta, Argentina

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-04-04 DOI:10.4279/pip.150002

P. F. Orte, E. Fernández Lajús, R. P. Di Sisto, E. Wolfram, Anabela Lusi, M. G. Nicora, R. D’Elia, Federico Verstraeten, S. Papandrea, Facundo Carmona

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Abstract

On December 14, 2020, southern South America experienced a total solar eclipse close to the solar noon. The path of totality, about 90 km wide, extended over the continental region from the Chilean west coast to the Argentine east coast, passing through the provinces of Neuquén, Río Negro and the extreme south of Buenos Aires. In order to study the effects on the atmosphere produced by the total eclipse, the Servicio Meteorológico Nacional Argentino (SMN) and Instituto de Investigaciones Científicas y Técnicas para la Defensa (CITEDEF) carried out a surface radiometric monitoring campaign in Valcheta (40.69°S; 66.15°W), Río Negro, Argentina. In this work, we explore the global surface solar irradiance on a horizontal plane (GHI) with the main objective of quantifying the changes in this parameter for cloudy and clear sky atmospheric conditions, combining ground-based measurements and modeling. A solar limb-darkening function was successfully implemented in the calculation of the irradiance at the top of the atmosphere (TOA) during the eclipse. We estimated a significant GHI attenuation of 41 % between the first (C1) and last (C4) contacts of eclipse compared to similar atmospheric conditions without the total eclipse, which represent a daily reduction of 12 %. In terms of irradiation, a reduction of 3360.1 KJ/m2 was calculated.

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阿根廷瓦尔切塔2020年日全食期间地表辐照度的变化

2020年12月14日，南美洲南部在接近太阳中午时出现日全食。全食路径宽约90公里，从智利西海岸延伸至阿根廷东海岸，途经诺伊昆省、里奥内格罗省和布宜诺斯艾利斯最南端。为了研究日全食对大气的影响，阿根廷国家气象局（SMN）和国防科学研究所（CITEDEF）在阿根廷内格罗的瓦尔切塔（40.69°S；66.15°W）开展了地表辐射监测活动。在这项工作中，我们探索了水平面上的全球表面太阳辐照度（GHI），主要目的是结合地面测量和建模，量化多云和晴朗天空大气条件下该参数的变化。日食期间，在计算大气层顶部辐照度（TOA）时成功地实现了日翼变暗功能。我们估计，与没有日全食的类似大气条件相比，在日食的第一次（C1）和最后一次（C4）接触之间，GHI显著衰减41%，这意味着每天减少12%。在辐射方面，计算出3360.1KJ/m2的减少。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.