Liquid cloud drop effective radius over China: A 20-year MODIS-based assessment

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Xiaolin Zhang , Yuanzhi Wang , Yele Sun , Xiaojing Shen , Huizheng Che , Thomas Choularton
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Abstract

Clouds are one of the most significant and uncertain components in weather forecasting and climate prediction. The 20-year detailed liquid water cloud effective radius (CER) over China from 2001 to 2020 are systematically studied based on the Moderate Resolution Imaging Spectroradiometer cloud products. The spatial distributions of CER show slight alterations of seasonal patterns of changes over China during 2001–2020. The monthly mean CER values over China vary from 12.7 μm in November to nearly 14.4 μm in July. The summer season has the largest average CER, followed by spring and winter, while autumn exhibits relatively lower CER levels over China. The mean CER values during 2001–2020 are found to be 14.7, 11.8 and 13.0 μm over the Tibetan Plateau, inland and coastal regions of China, respectively. High CERs in spring and winter are seen in the Tibet Plateau, whereas the reverse is true over the inland and coastal regions. The impacts of precipitable water vapor (PWV) and aerosol optical depth on the CER over China are complex, whereas the correlations between CER and PWV can be generally expressed by a two-stage linear fitting, showing distinct turning points in different seasons and regions. The CER over different regions of China shows an increase with enhanced PWV under low or high water vapor conditions as opposed to an increase of CER under moderate water vapor levels. Our study indicates a high CER in the Tibet Plateau and low over the Sichuan Basin, and significantly distinct impact of PWV on the CER in the Tibet Plateau.
中国上空的液态云滴有效半径:基于 MODIS 的 20 年评估
云是天气预报和气候预测中最重要和最不确定的组成部分之一。基于中分辨率成像分光仪云产品,系统研究了2001-2020年中国上空20年详细的液态水云有效半径(CER)。2001-2020 年间,中国上空的 CER 空间分布呈现出轻微的季节变化规律。中国上空的月平均 CER 值从 11 月的 12.7 μm 到 7 月的近 14.4 μm 不等。夏季的平均 CER 值最大,其次是春季和冬季,而秋季的 CER 值相对较低。2001-2020 年期间,中国青藏高原、内陆和沿海地区的平均 CER 值分别为 14.7、11.8 和 13.0 μm。西藏高原春季和冬季的 CER 值较高,而内陆和沿海地区则相反。可降水水汽和气溶胶光学深度对中国上空 CER 的影响非常复杂,而 CER 与可降水水汽之间的相关关系一般可以用两级线性拟合来表示,在不同季节和地区表现出明显的转折点。在低水汽或高水汽条件下,中国不同地区上空的 CER 会随着 PWV 的增加而增加,而在中等水汽水平下 CER 则不会增加。我们的研究表明,西藏高原的 CER 较高,四川盆地较低,而 PWV 对西藏高原的 CER 有明显的影响。
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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