Polarization lidar observations of diurnal and seasonal variations in the atmospheric mixing layer above a tropical rural place gadanki, India

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-08-23 DOI:10.1016/j.jastp.2024.106335

Vishnu Rajendra Kumar , Richard L. Collins , Bhavani Kumar Yellapragada

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Abstract

This study presents the daily and seasonal variation of the atmospheric mixing layer height (MLH) over Gadanki, India (13.45°N, 79.18°E), a tropical rural location based on polarization lidar observations. The observations spanned the years 2009–2014, encompassing 303 instances, and coinciding with radiosonde and surface weather station measurements. The MLH was determined through the analysis of aerosol profiles and confirmed with the MLH values derived from radiosonde data. The lidar depolarization ratio was employed to characterize aerosol shape. This study aims to establish a connection between aerosol backscatter and its shape through lidar observations, considering diurnal and seasonal variations, while also identifying the influencing factors. This study illustrates four distinct case studies conducted during different seasons to depict aerosol behavior in both convectively active and non-active periods. These case studies unveil the influence of aerosol shape on water intake and subsequent residual layer and cloud formation. The observed fluctuations in MLH and aerosol shape suggest a dynamic relationship between local meteorology and long-range aerosol transport.

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极化激光雷达对印度加丹吉热带农村地区上空大气混合层昼夜和季节变化的观测

本研究基于偏振激光雷达观测数据，介绍了印度加丹吉（北纬 13.45°，东经 79.18°）上空大气混合层高度（MLH）的日变化和季节变化。观测时间跨度为 2009-2014 年，共 303 次，与无线电探空仪和地面气象站的测量结果相吻合。通过分析气溶胶剖面确定了 MLH，并与从辐射计数据得出的 MLH 值进行了确认。利用激光雷达去极化比来描述气溶胶的形状。本研究旨在通过激光雷达观测建立气溶胶后向散射与其形状之间的联系，同时考虑昼夜和季节变化，并确定影响因素。本研究阐述了在不同季节进行的四个不同案例研究，以描述对流活跃期和非活跃期的气溶胶行为。这些案例研究揭示了气溶胶形状对吸水和随后的残留层及云形成的影响。观察到的 MLH 和气溶胶形状的波动表明，当地气象与长程气溶胶传输之间存在动态关系。

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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.