Simultaneous observations of atmospheric vertical potential gradient from coastal Antarctic stations Bharati and Maitri

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science Pub Date : 2023-12-01 DOI:10.1016/j.polar.2023.101013

Krishnamoorthy Jeeva , Geeta Vichare , Gopi K. Seemala , Atul S. Kulkarni , Elango Paramasivan , Subrata Moulik , Anoop K. Soman , Pranjal Saikia

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引用次数: 0

Abstract

Simultaneous observations of the atmospheric electric potential gradient (PG) at Bharati and Maitri stations were studied from 2014 to 2016. A new regional diurnal pattern of fair-weather PG for the coastal Antarctic region, perhaps the ubiquitous characteristics of the PG for the coastal Antarctic region, has been identified. This pattern has a significant broad minimum around noon hours. It is around this time the wind speed is also maximum. The PG data of past years of Syowa, Vostok, and Carnegie Cruise were also used in this study. The surface wind distorts the fair-weather diurnal pattern of PG over Bharati more intensely than at Maitri. The katabatic wind effect on the PG at Bharati appears to be more intense than at Maitri. The topography and katabatic winds associated with the Lambert glacier could be the reason. The observation of Bipolar Air Ion Concentration (BAIC) suggests that the wind speed significantly affects the concentration by accumulation and dispersion. The concentration is maximum when the wind speed is minimum. As the air ion concentration controls the conductivity, the PG is expected to be minimum during these hours to produce an anomalous diurnal pattern in the PG at Bharati. Data quality is improved by measuring the PG with a field monitor at the surface level instead of at an elevated position. This study provides new hope in pursuing globally representative data of the PG for further investigations on the global thunderstorm activity and the solar-terrestrial weather relationship.

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从南极沿岸站 Bharati 和 Maitri 同时观测大气垂直势梯度

研究了 2014 年至 2016 年期间在 Bharati 和 Maitri 站对大气电势梯度（PG）的同步观测。研究发现了南极沿岸地区新的区域晴雨电势梯度昼夜模式，这或许是南极沿岸地区电势梯度的普遍特征。这种模式在中午前后有一个明显的宽幅最小值。此时风速也最大。本研究还使用了 Syowa、Vostok 和 Carnegie Cruise 历年的 PG 数据。与麦特里相比，巴拉蒂上空的地面风更强烈地扭曲了晴天的昼夜 PG 模式。在巴拉蒂，卡塔巴风对 PG 的影响似乎比在麦特里更强烈。这可能是与兰伯特冰川有关的地形和卡巴他风的原因。对双极空气离子浓度（BAIC）的观测表明，风速会通过积累和扩散对浓度产生重大影响。风速最小时浓度最大。由于空气离子浓度控制着电导率，因此预计在这些时段，巴拉蒂的 PG 值会最小，从而产生 PG 值的反常昼夜模式。通过在地表而不是在高处使用现场监测仪测量 PG，可以提高数据质量。这项研究为进一步研究全球雷暴活动和日地天气关系提供了新的希望。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

3.90

自引率

5.60%

发文量

期刊介绍： Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.