韩国综合模式 (KIM) 北半球夏季和冬季季节模拟中云垂直重叠对云辐射效应的影响

IF 2.2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
So-Young Kim
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引用次数: 0

摘要

在韩国综合模式(KIM)的研究版本中,云的指数随机垂直重叠被用于辐射过程,以取代云的最大随机垂直重叠。使用指数随机重叠时,云层辐射效应(CRE)总体上有所增加。这是因为,在最大随机重叠假设下,垂直连续的云层会最大程度地重叠,而根据云层之间的垂直距离和指定的云层相关长度,可以将垂直连续的云层放宽为随机重叠。在以往观测研究的基础上,考虑云的相关长度的纬度依赖性,可进一步增强 CRE。这减轻了 CRE 的偏差,CRE 整体上被低估了,但在低纬度地区,CRE 在本次模拟中被高估了。辐射过程和对流过程之间的相互作用在降低西太平洋热带地区的 CRE 方面发挥了作用,因为该地区对流较强,尽管应用指数随机重叠的直接影响是减少了冰云之间的垂直重叠。由于云重叠的变化,对流层下部温度的模拟得到了改善。由于 CRE 增加,更多短波通量被反射,欧亚大陆上空的暖偏差尤其得到缓解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Impact of Cloud Vertical Overlap on Cloud Radiative Effect in the Korean Integrated Model (KIM) Seasonal Simulations during Boreal Summer and Winter

Impact of Cloud Vertical Overlap on Cloud Radiative Effect in the Korean Integrated Model (KIM) Seasonal Simulations during Boreal Summer and Winter

Exponential-random vertical overlap of clouds is applied for radiative processes in a research version of the Korean Integrated Model (KIM) to replace the maximum-random vertical overlap of clouds. The cloud radiative effect (CRE) increases overall when the exponential-random overlap is used. This is because vertically continuous clouds, which are assumed to overlap maximally under the maximum-random overlap assumption, can be relaxed to random overlap depending on the vertical distance between cloud layers and the specified decorrelation length of clouds. CRE is more enhanced by considering the latitudinal dependency of cloud decorrelation length based on previous observational studies. This alleviates biases in CRE, which is underestimated overall, except in the low latitudes where the CRE is overestimated in the present simulations. The interaction between radiative and convective processes plays a role in decreasing CRE over the tropical western Pacific region, where strong convections develop, although the direct impact of applying the exponential-random overlap is to decrease the vertical overlap between ice clouds. The simulation of temperature in the lower troposphere is improved owing to the changes in cloud overlap. The warm bias over the Eurasian continent, in particular, is alleviated as more shortwave fluxes are reflected due to increased CRE.

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来源期刊
Asia-Pacific Journal of Atmospheric Sciences
Asia-Pacific Journal of Atmospheric Sciences 地学-气象与大气科学
CiteScore
5.50
自引率
4.30%
发文量
34
审稿时长
>12 weeks
期刊介绍: The Asia-Pacific Journal of Atmospheric Sciences (APJAS) is an international journal of the Korean Meteorological Society (KMS), published fully in English. It has started from 2008 by succeeding the KMS'' former journal, the Journal of the Korean Meteorological Society (JKMS), which published a total of 47 volumes as of 2011, in its time-honored tradition since 1965. Since 2008, the APJAS is included in the journal list of Thomson Reuters’ SCIE (Science Citation Index Expanded) and also in SCOPUS, the Elsevier Bibliographic Database, indicating the increased awareness and quality of the journal.
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