Parameterizing the Heterogeneous Liquid-Ice Mixing in Modeling Ice Growth Through the Wegener-Bergeron-Findeisen Process in CAM6

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2025-04-08 DOI:10.1029/2024GL114036

Jing Yang, Jianqiao Lu, Yuting Deng, Yong Wang, Chunsong Lu, Yan Yin, Zhien Wang, Xiaoqin Jing, Kang Yang

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Abstract

Accurate representation of cloud phase partitioning is critical for understanding the cloud feedback to climate change, but the supercooled liquid fraction is often underestimated in global climate models, in part due to the assumption of homogeneous distributions of hydrometeors in mixed-phase clouds. In this study, we take into account the heterogeneous liquid-ice mixing in modeling the ice depositional growth using airborne in situ measurements. The impact of heterogeneous liquid-ice mixing on the Wegener-Bergeron-Findeisen process is parameterized as the fraction of ice that is mixed with liquid water, which is a function of liquid-ice mixing homogeneity and liquid fraction. The liquid-ice mixing homogeneity, quantified using the information entropy theory, is parameterized using the total condensed water content and temperature. With this observationally constrained parameterization incorporated in the Community Atmospheric Model version 6, the modeled cloud phase partitioning and cloud radiative forcing are improved.

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CAM6中采用wegen - bergeron - findeisen过程模拟冰生长时非均质液冰混合的参数化

准确表示云相分区对于理解云对气候变化的反馈至关重要，但全球气候模式中过冷液体部分经常被低估，部分原因是假设混合相云中的水介质分布均匀。在本研究中，我们在利用机载原位测量数据建立冰沉积增长模型时考虑了异质液冰混合。异质液冰混合对魏格纳-伯格伦-芬德森过程的影响被参数化为与液态水混合的冰的比例，这是液冰混合均匀度和液体比例的函数。利用信息熵理论量化的液冰混合均匀度，是利用总凝结水含量和温度进行参数化的。将这一受观测制约的参数化方法纳入共同体大气模式第 6 版后，改进了模型云相分区和云辐射强迫。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.