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Cirrus cloud distribution is a significant issue in atmospheric sciences, as it is essential for weather, climate, and Earth’s energy balance-related research. To understand it, we analyzed the monthly average Cirrus Reflectance (CR) covering the period from December 2001 to November 2022. The latitudes of the global region were divided into 36 latitude zones with 5-minute intervals. The results of the Cirrus cloud reflectance exhibit a strong negative correlation with a correlation coefficient of −0.761. Yearly average global distribution of cirrus reflectance was found to be almost symmetrical around 5° N in the regions covering mid- and low latitudes. Up to ±60° latitude from the center, cirrus clouds reflectance was observed to be decreased first, after then, it was found to be increased. The formation of cirrus was closely associated with the water vapor content of the atmosphere, which varied significantly depending on the underlying surface types and latitudes. The slopes of linearly fitted cirrus reflectance were found to be steeper for the southern hemisphere (−0.0002/year) than that of northern hemisphere (−0.0001/year). It was found from statistical analysis that the cirrus reflectance varies visibly with seasonal changes.

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Two Decadal (2001–2022) Variability of Global Cirrus Clouds’ Reflectance Utilizing Retrievals Based on CALIPSO-CALILOP Satellite Data

  • 会议论文

  • 发表日期：

    2025年

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  • Lakshmi,
  • V. K. Soni,
  • Adarsh Kumar

摘要

Cirrus cloud distribution is a significant issue in atmospheric sciences, as it is essential for weather, climate, and Earth’s energy balance-related research. To understand it, we analyzed the monthly average Cirrus Reflectance (CR) covering the period from December 2001 to November 2022. The latitudes of the global region were divided into 36 latitude zones with 5-minute intervals. The results of the Cirrus cloud reflectance exhibit a strong negative correlation with a correlation coefficient of −0.761. Yearly average global distribution of cirrus reflectance was found to be almost symmetrical around 5° N in the regions covering mid- and low latitudes. Up to ±60° latitude from the center, cirrus clouds reflectance was observed to be decreased first, after then, it was found to be increased. The formation of cirrus was closely associated with the water vapor content of the atmosphere, which varied significantly depending on the underlying surface types and latitudes. The slopes of linearly fitted cirrus reflectance were found to be steeper for the southern hemisphere (−0.0002/year) than that of northern hemisphere (−0.0001/year). It was found from statistical analysis that the cirrus reflectance varies visibly with seasonal changes.