能量通量对调节印度夏季风变率的动力学影响

IF 1.9 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2025-06-20 DOI:10.1016/j.jastp.2025.106568

R. Bhatla , Archana Maurya , Aashna Verma , R.K. Mall , Sanjay Bist

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引用次数: 0

摘要

地表热通量在形成印度夏季风（ISM）动力学中具有重要作用。本研究研究了ISM季节地表能量通量（净短波辐射通量、潜热通量和净热通量）的三年期和年代际气候变化。为此，考虑了来自欧洲中期天气预报中心第五代（ERA5）和国家环境预测中心-国家大气研究中心（NCEP-NCAR）的长期（1961-2020）再分析数据集。印度半岛南部、阿拉伯海（AS）、孟加拉湾（BoB）、赤道印度洋（EIO）和南印度洋的能量通量分布存在显著的区域差异和变化模式。BoB和AS是重要的水汽来源，分别直接促成了印度东部、中部和西部的季风降雨。在AS区（9W/m2）和EIO区（12W/m2）观测到LHF的显著正变化，而在BoB区，近三十年来一直持续出现- 8 W/m2的负偏离。这些变化对应于NHF的显著负异常模式，即AS区为- 11 W/m2， EIO区为- 18 W/m2， BoB区NHF值增加最多（20 W/m2）。AS、EIO和BoB表面通量明显的三分相移被认为是影响ISM降雨的一个因素。

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The dynamical influence of energy fluxes in modulating variability of the Indian summer monsoon

The surface heat fluxes have a significant role in shaping the Indian summer monsoon (ISM) dynamics. The present study investigates the climatological tricadal and decadal variability of surface energy fluxes viz., net shortwave radiation flux, latent heat flux (LHF) and net heat flux (NHF) during ISM season. For that purpose, a long-term (1961–2020) reanalysis data sets derived from the European Centre for Medium-Range Weather Forecasts fifth-generation (ERA5) and National Center for Environmental Prediction-National Centre for Atmospheric Research reanalysis (NCEP-NCAR) has been considered. Significant regional differences and changing patterns have been observed in the distribution of energy fluxes over southern peninsular India, Arabian Sea (AS), Bay of Bengal (BoB), Equatorial Indian Ocean (EIO), and Southern Indian Ocean. The BoB and AS emerge as vital moisture sources, directly contributing to the monsoon rainfall over eastern, central and western India, respectively. A significant positive change in LHF is observed over AS (9W/m²) and EIO (12W/m²) regions, whereas over the BoB region, a negative departure of −8 W/m² has been persistent in the recent tricade. These changes correspond to the significant negative anomalous patterns of NHF, i.e., −11 W/m² over AS and −18 W/m² over EIO, alongside the highest increase in NHF value over the BoB regions (20 W/m²). The pronounced tricadal phase shift of surface fluxes over AS, EIO, and BoB is identified as a contributing factor influencing ISM rainfall.

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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.