印度半干旱区气溶胶的吸收和散射：时间变化和可能的来源

IF 1.9 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2025-08-21 DOI:10.1016/j.jastp.2025.106613

Pawan S. Soyam , Pramod D. Safai , Shivdas Bankar , Kiran Todekar , Neelam Malap , Sunil Kondle , Pradeep Zambare , Mahendra Mane , Sanjay S. Kale , Thara Prabhakaran

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引用次数: 0

摘要

本文研究了印度Solapur（17°43′45.4332″N, 75°0.51′24.4476″E, 457 m AMSL）半干旱区气溶胶吸收散射系数和单次散射反照率（SSA）等光学特性的日变化特征和季节特征。这些气溶胶光学特性在理解气溶胶辐射强迫和大气气溶胶对气候的影响方面起着至关重要的作用。然而，对于印度半岛特别是干旱地区气溶胶光学特性的时间动态，目前还缺乏全面的研究。为了解决这一差距，我们进行了多年（2019年7月至2022年10月）的测量活动，以表征Solapur的气溶胶光学特性。我们的发现揭示了气溶胶光学特性在日、季节和年尺度上的显著时间变化。日变化过程中，气溶胶光学特性表现出明显的变化规律，由于人为活动和局地排放的增加，白天气溶胶的吸收和散射系数较高。在季节上，气溶胶负荷受主要气象条件变化的影响，包括季风影响的气溶胶清除和气溶胶的区域运输。年际变率反映了局地排放、土地利用模式和局地边界层条件变化等因素的可能影响。此外，SSA值的年际变化不大，季风后最大，季风期最小。SSA值（平均值0.71±0.02，中位数0.73±0.03）表明，在该半干旱地区，气溶胶的吸收在气溶胶辐射强迫中起着重要作用，从而导致大气变暖。

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Absorbing and scattering aerosols over semi-arid region in India: Temporal variation and possible sources

This research article investigates the diurnal and seasonal characteristics of aerosol optical properties such as absorbing and scattering coefficients and single scattering albedo (SSA) over the semi-arid region of Solapur (17°43′45.4332″ N, 75°.51′24.4476″ E, 457 m AMSL), India. These aerosol optical properties play a crucial role in understanding the aerosol radiative forcing and thereby the climate impact of atmospheric aerosols. However, there is a lack of comprehensive studies focusing on the temporal dynamics of aerosol optical properties in peninsular India especially from the arid region. To address this gap, we conducted multiyear (July 2019 to October 2022) measurement campaign to characterize the aerosol optical properties at Solapur. Our findings reveal significant temporal variations in the aerosol optical properties on the diurnal, seasonal, and annual scales. Diurnally, the aerosol optical properties showed distinct patterns, with higher absorption and scattering coefficients during daytime due to increased anthropogenic activities and local emissions. Seasonally, the aerosol loading was influenced by changes in the prevailing meteorological conditions, including aerosol scavenging due to the monsoonal influences and regional transport of aerosols. The intra-annual variability suggested the possible influence of various factors such as changes in local emissions, land use patterns, and local boundary layer conditions. Furthermore, the SSA values showed slight annual variation, with maximum values in post monsoon and minimum during monsoon period. SSA value (mean 0.71 ± 0.02 and median 0.73 ± 0.03) indicated towards significant role of absorbing aerosols in aerosol radiative forcing and thereby atmospheric warming over this semi-arid location.

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.