基于CERES高分辨率数据的热带对流活动区云型特性与辐射效应分解比较

IF 3.4 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Kuan-Man Xu, Moguo Sun, Yaping Zhou
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引用次数: 0

摘要

陆地和海洋对流在强度和夹带方面表现出显著的差异,但它们对其他云类型性质的影响尚不清楚。本研究按云类型考察了19年的云特性平均值和大气顶(TOA)云辐射效应(cre),重点关注对流活跃的热带地区的区域变化。根据有效云顶压力和云光学深度对42种云类型进行了分类。分析表明,云的发生和性质存在明显的区域差异,海洋区域以对流顶云和边界层云为主,液体/冰水含量较高,而陆地区域以中层云较多,液体/冰水含量较低。该研究进一步探讨了短波(SW)、长波(LW)和净CRE,将单个云类型对两个地区总CRE差异的贡献分解为三个组成部分:云类型内的CRE偏差、云分数(CF)偏差及其综合效应。结果表明,CF偏差对中高层云的影响最大,增强了LW增温和SW冷却,而降低了低层云的SW和净冷却。尽管CRE偏差对单个云类型的影响小于CF偏差的影响,但其对总区域CRE差异的集体贡献,特别是净CRE,更具可比性,因为前者在所有云类型中表现出一致的区域差异,而后者受到低层和高层云之间相反影响的影响。分解分析还强调了由陆海对比和气象强迫驱动的显著区域差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Comparison of Cloud-Type Properties and Radiative Effect Decomposition in Tropical Convectively Active Regions Using CERES High-Resolution Data

Comparison of Cloud-Type Properties and Radiative Effect Decomposition in Tropical Convectively Active Regions Using CERES High-Resolution Data

Land and oceanic convection exhibit significant contrasts in intensity and entrainment, but their effects on the properties of other cloud types remain unclear. This study examines a 19-year mean of cloud properties and top-of-the-atmosphere (TOA) cloud radiative effects (CREs) by cloud type, with a focus on regional variations across convectively active tropical regions. Forty-two cloud types are classified based on effective cloud-top pressure and cloud optical depth. The analysis reveals distinct regional differences in cloud occurrence and properties, with oceanic regions dominated by convective anvils and boundary-layer clouds, which have higher liquid/ice water contents, while land regions feature higher fractions of mid-level clouds with lower liquid/ice water contents. The study further explores shortwave (SW), longwave (LW), and net CREs, decomposing the contributions of individual cloud types to total CRE differences between two regions into three components: CRE deviations within a cloud type, cloud fraction (CF) deviations, and their combined effect. Results show that CF deviations have the largest impact, enhancing LW warming and SW cooling for mid- and high-level clouds while reducing SW and net cooling for low-level clouds. Although the effects of CRE deviations are smaller than those of CF deviations for individual cloud types, its collective contribution to total regional CRE differences, particularly for net CRE, is more comparable, because the former exhibits consistent regional differences across all cloud types while the latter is influenced by opposing effects between low- and high-level clouds. The decomposition analysis also highlights significant regional variations driven by land-ocean contrasts and meteorological forcings.

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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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