Physical and optical properties of cirrus and subvisible cirrus clouds over Arabian sea and Bay of Bengal region

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-07-17 DOI:10.1016/j.jastp.2024.106303

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Abstract

Cirrus clouds play a crucial role in regulating the Earth’s radiation budget, and this paper aims to contribute to a deeper understanding of their optical and geometrical properties over the Arabian Sea (AS) and Bay of Bengal (BoB) regions using CALIPSO data. Comprehensive statistics are derived, encompassing mean values of cirrus cloud top, base altitude, geometrical thickness, cloud optical depth, and temperature. Over the AS region, the mean values are 15.10 ± 1.50 km, 12.63 ± 1.75 km, 2.52 ± 1.37 km, 0.4 ± 0.58, and -62.30 ± 10.6 (°C), respectively. For the BoB region, the corresponding values are 15.43 ± 1.51 km, 12.72 ± 1.74 km, 2.71 ± 1.46 km, 0.49 ± 0.67, and -64.35 ± 10.7 (°C). A larger spread in optical depth and a higher frequency of occurrence for both cirrus and subvisible cirrus (SVC) clouds were observed over BoB compared to AS. Additionally, the study delves into SVC cloud characteristics, emphasizing their thinness and higher base altitudes compared to cirrus clouds. This comprehensive investigation contributes valuable insights into the distinctive properties of cirrus and SVC clouds in these regions, enhancing our knowledge of atmospheric processes and their implications for climate modelling and predictions.

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阿拉伯海和孟加拉湾地区卷云和亚可见卷云的物理和光学特性

卷云在调节地球辐射预算方面发挥着至关重要的作用，本文旨在利用 CALIPSO 数据加深对阿拉伯海（AS）和孟加拉湾（BoB）地区上空卷云光学和几何特性的了解。得出的综合统计数据包括卷云顶部、基底高度、几何厚度、云光学深度和温度的平均值。在 AS 区域，平均值分别为 15.10 ± 1.50 km、12.63 ± 1.75 km、2.52 ± 1.37 km、0.4 ± 0.58 和 -62.30 ± 10.6 (°C)。BoB 区域的相应数值分别为 15.43 ± 1.51 千米、12.72 ± 1.74 千米、2.71 ± 1.46 千米、0.49 ± 0.67 和 -64.35 ± 10.7（°C）。与 AS 相比，在 BoB 上观测到的卷云和亚可见卷云（SVC）的光学深度分布更大，出现频率更高。此外，该研究还深入探讨了亚可见卷云（SVC）的特征，强调了它们与卷云相比更薄、基底高度更高。这项全面调查为了解这些地区卷云和亚可见卷云的独特性质提供了宝贵的见解，增进了我们对大气过程的了解及其对气候建模和预测的影响。

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

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.