Contrasting effects of aerosols on surface temperature over the Indo-Gangetic Plain and Tibetan Plateau

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth System Science Pub Date : 2024-09-02 DOI:10.1007/s12040-024-02387-z
Vijayakumar S Nair, S Suresh Babu
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Abstract

Atmospheric aerosols partly compensate for the warming due to greenhouse gases by perturbing the radiation balance of the Earth–Atmosphere system. In this study, the impacts of aerosols on surface temperature are examined over the Indo-Gangetic Plain (IGP) and Himalayan Tibetan Plateau (HTP), where diverse aerosol and climatic conditions prevail. Both regions have significant impacts on the regional climate and hydrological cycles in South Asia. The IGP experiences high aerosol loading throughout the year and is expected to affect surface temperature significantly. In contrast, the HTP exhibits relatively pristine or lower aerosol loading, whose effects on surface temperature are highly uncertain due to snow albedo feedback. Climate model simulations are used to decompose the surface temperature changes due to aerosol forcing to its radiative and non-radiative components over the IGP and HTP. The shortwave cooling due to aerosols is mostly compensated by the decrease in sensible heat over the IGP. On the other hand, HTP experiences surface cooling due to the direct effects and surface warming due to aerosol-induced snow-darkening effects (deposition of absorbing aerosols on snow). The net effect of aerosols on shortwave radiation is further redistributed into non-radiative heat fluxes. This study provides a better understanding of aerosol-induced surface temperature change and its partitioning into radiative and non-radiative components.

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气溶胶对印度-甘肃平原和青藏高原地表温度的不同影响
大气气溶胶通过扰动地球-大气系统的辐射平衡,部分补偿了温室气体导致的变暖。本研究考察了气溶胶对印度-遗传平原(IGP)和喜马拉雅青藏高原(HTP)地表温度的影响,这两个地区的气溶胶和气候条件各不相同。这两个地区对南亚的区域气候和水文循环都有重大影响。国际地质公园全年气溶胶负荷较高,预计会对地表温度产生重大影响。相比之下,高纬度地区的气溶胶负荷相对较低,由于雪的反照率反馈,气溶胶对地表温度的影响非常不确定。气候模型模拟用于将气溶胶强迫引起的地表温度变化分解为 IGP 和 HTP 上的辐射和非辐射部分。气溶胶导致的短波降温主要由国际地球物理学计划上显热的减少来补偿。另一方面,由于气溶胶的直接影响和气溶胶引起的雪变暗效应(吸收性气溶胶在雪上的沉积),高纬度地区的地表变冷。气溶胶对短波辐射的净效应被进一步重新分配为非辐射热通量。这项研究有助于更好地了解气溶胶引起的地表温度变化及其辐射和非辐射部分的划分。
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来源期刊
Journal of Earth System Science
Journal of Earth System Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
3.20
自引率
5.30%
发文量
226
期刊介绍: The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’. The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria. The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region. A model study is carried out to explain observations reported either in the same manuscript or in the literature. The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.
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