Observed thermodynamical-cloud-rain characteristics during pre-monsoon precipitating events over a high-altitude site in Western Ghats, India

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2025-02-13 DOI:10.1016/j.jastp.2025.106459

P.P. Leena , E.A. Resmi , Dhwanit.J. Mise , V. Anilkumar , V.S. Arun , Rohit P.Patil , G. Pandithurai , Lekshmi Anilkumar

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引用次数: 0

Abstract

The present study detailed the atmospheric stability and cloud-rain properties during pre-monsoon precipitating events using co-located ground-based observation of a high-altitude site, in Western Ghats, India. The meteorological - moisture parameters and stability indices showed strong diurnal and seasonal variation over the study region. Higher values in the stability indices and moisture parameters were noted throughout the day (during afternoon hours) of monsoon (pre- and post-monsoon) suggesting the possibility of convective activity over the study region. Features of layered clouds mostly, with low bases were noticed during monsoon, followed by pre- and post-monsoon.

A detailed analysis of meteorological-moisture parameters, stability indices, and cloud properties during pre-monsoon, highlighted an apparent change in these parameters from non-precipitating to precipitating events. Strong precipitating event were characterized by higher low-level moisture,sharp changes in the meteorological parameters and few stability indices. Higher values of radar reflectivity (>40 dBz) indicated strong precipitating event as a convective storm. Higher liquid and lower values of brightness temperature confirmed the presence of deep clouds during the strong event. Quantitative analysis showed higher values in temperature (T), equivalent potential temperature (EPT), total total index (TTI), K-index (KI), humidity index (HI), and lifted index (LI) ∼2 h before the strong event suggesting an unstable atmosphere and conducive for thunderstorm development. Single-layer clouds of ∼8% (20%) and the double layer of ∼42% (26%) were observed before (after) the strong event. An apparent difference in the CFAD of radar reflectivity was noticed between strong and weak cases with high reflectivity values in the lower altitudes for strong cases as compared to weak ones. We believe that this information is very useful for the nowcasting of thunderstorms.

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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.