基于ARM观测和EAMv2模拟的南北高纬度云特性比较研究

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
N. Desai, M. Diao, Y. Shi, X. Liu
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引用次数: 0

摘要

地球的高纬度地区显示出相当多的云覆盖,这显著影响了全球辐射预算。在本研究中,我们研究了在北半球和南半球高纬度地区(北半球和南半球)进行的两次大气辐射测量(ARM)野外活动的地面和船舶遥感观测结果。对低层、中层、高层和深层云的宏观物理特性的比较表明,与南大洋和南极地区相比,北极每种云类型的云顶高度和厚度值都更高,这可能是由于北大西洋的海面温度更高。与南半球高纬度地区相比,北极的低云冰相出现频率也较低。对于高、中、深云,云相分布作为温度的函数表现出很小的地理变异。然后将观测结果与美国能源部(DOE)能源百亿亿次地球系统模型(E3SM)进行比较,以评估这些云特性的表征。结果表明,该模式能较好地捕捉云底和云顶高度,并能再现两个半球云宏观物理特性的差异。但该模型低估了所有云类型的冰相频率。这种模式云相偏差与正相对湿度偏差和负气溶胶数浓度偏差有很强的相关性,表明相对湿度和气溶胶在模式中调节云相分配中起着重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Comparative Study of Cloud Properties Between Northern and Southern High Latitudes Based on ARM Observations and EAMv2 Simulations

Earth's high-latitude regions show a considerable amount of cloud coverage, which significantly affects global radiation budgets. In this study, we examine ground- and ship-based remote sensing observations from two Atmospheric Radiation Measurement (ARM) field campaigns conducted in the high-latitude regions of Northern and Southern Hemispheres (NH and SH). A comparison of macrophysical properties for low, mid-level, high, and deep clouds shows that the cloud top heights and thickness values are higher in the Arctic for each cloud type compared with the Southern Ocean and Antarctic regions, possibly due to higher sea surface temperatures in the north Atlantic. The Arctic also shows lower ice phase occurrence frequencies compared with the SH high latitudes for low clouds. For high, mid-level and deep clouds, the cloud phase distributions as a function of temperature show small geographical variabilities. The observations are then compared with the Department of Energy (DOE) Energy Exascale Earth System Model (E3SM) to evaluate the representations of these cloud properties. The results show that the model captures cloud base and top heights well and reproduces the differences in cloud macrophysical properties between the two hemispheres. But the model underestimates ice phase frequencies for all cloud types. Such model cloud phase bias is strongly correlated with positive relative humidity biases and negative aerosol number concentration biases, indicating an important role of relative humidity and aerosols in modulating cloud phase partitioning in the model.

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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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