Thermodynamic and stability features of the atmospheric boundary layer over Kochi during different monsoon seasons based on radiosonde profiles

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-03-01 DOI:10.1016/j.jastp.2024.106209

Linsha C. L , Reshma T , Hamza Varikoden , Vishnu R

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Abstract

The characteristics of thermodynamic parameters at different pressure levels have been studied using radiosonde data for the period 1989–2019 during different seasons incorporating sea-land breeze circulation influences over Kochi, in western peninsular India. It is also observed that the variation in lower tropospheric stability of (LTS) is found to be influenced by other thermodynamic parameters, such as temperature, mixing ratio, potential temperature, equivalent potential temperature, CAPE, and CINE at various pressure levels. The average value of temperature, potential temperature, mixing ratio, and equivalent potential temperature was maximum during the pre-monsoon season. At 700 hPa level, the average value of the mixing ratio was high during the sea breeze circulation of pre-monsoon season. The average value of equivalent potential temperature at 700 hPa level was maximum for the southwest monsoon season. A decreasing trend was observed in lower tropospheric stability (LTS) over the region in all seasons except for the winter season during the sea breeze circulation. The positive trend of LTS was observed during the sea breeze circulation time during the winter season, and it has a strong correlation with the positive trend in temperature and potential temperature at the 700 hPa level. Moreover, the southwest monsoon season exhibited a substantial decrease in LTS, potentially associated with an increasing trend in temperature, potential temperature, mixing ratio, and equivalent potential temperature at the surface level. CAPE has a significant increasing trend only for the sea breeze circulation period during the monsoon season. Additionally, CINE displayed an increasing trend across all seasons, with higher values observed during the winter and post-monsoon seasons.

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基于辐射探空仪剖面的不同季风季节高知上空大气边界层的热力学和稳定性特征

利用 1989-2019 年期间不同季节的无线电探空仪数据，结合印度半岛西部科奇上空的海陆风环流影响，研究了不同气压水平的热力学参数特征。研究还发现，对流层低层稳定性的变化受到其他热力学参数的影响，如不同气压水平下的温度、混合比、位温、等效位温、CAPE 和 CINE。温度、势温、混合比和等效势温的平均值在季风前季节最大。在季风前的海风环流期间，700 百帕高度的混合比平均值较高。在西南季风季节，700 百帕高度的等效势温平均值最大。除冬季海风环流期间外，该地区所有季节的对流层低层稳定性都呈下降趋势。在冬季海风环流期间，低对流层稳定度呈正值趋势，与 700 hPa 水平的气温和潜在温度的正值趋势密切相关。此外，西南季风季节的 LTS 呈大幅下降趋势，这可能与地表温度、位温、混合比和等效位温的上升趋势有关。只有在季风季节的海风环流期，CAPE 才有明显的增加趋势。此外，CINE 在所有季节都呈上升趋势，冬季和季风后季节的数值更高。

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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.