Cloud Top Phase Characterization of Extratropical Cyclones over the Northeast and Midwest United States: results from IMPACTS

IF 3 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Journal of the Atmospheric Sciences Pub Date : 2023-12-22 DOI:10.1175/jas-d-23-0123.1

T. J. Zaremba, R. Rauber, Kaylee Heimes, J. Yorks, Joseph A. Finlon, Stephen D. Nicholls, P. Selmer, L. McMurdie, G. McFarquhar

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引用次数: 0

Abstract

Cloud top phase (CTP) impacts cloud albedo and pathways for ice particle nucleation, growth, and fallout within extratropical cyclones. This study uses airborne lidar, radar, and Rapid Refresh analysis data to characterize CTP within extratropical cyclones as a function of cloud top temperature (CTT). During the 2020, 2022, and 2023 Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) field campaign deployments, the Earth-Resources 2 (ER-2) aircraft flew 26 research flights over the Northeast and Midwest U.S. to sample the cloud tops of a variety of extratropical cyclones. A training dataset was developed to create probabilistic phase classifications based on Cloud Physics Lidar measurements of known ice and liquid clouds. These classifications were then used to quantify dominant CTP in the top 150 m of clouds sampled by the Cloud Physics Lidar in storms during IMPACTS. Case studies are presented illustrating examples of supercooled liquid water at cloud top at different CTT ranges(−3°C −20°C. Liquid-bearing cloud tops were found at CTTs as cold as −37°C.

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美国东北部和中西部地区热带气旋的云顶阶段特征：IMPACTS 的结果

云顶相（CTP）会影响云的反照率以及冰粒子在外侧热带气旋中成核、生长和降落的途径。本研究利用机载激光雷达、雷达和快速刷新分析数据来描述外热带气旋内的 CTP 与云顶温度 (CTT) 的函数关系。在 2020 年、2022 年和 2023 年大西洋沿岸威胁性暴风雪微物理和降水调查（IMPACTS）实地活动部署期间，地球资源 2 号（ER-2）飞机在美国东北部和中西部上空进行了 26 次研究飞行，对各种外热带气旋的云顶进行采样。根据已知冰云和液云的云物理激光雷达测量结果，开发了一个训练数据集，用于创建概率相位分类。这些分类随后被用于量化 IMPACTS 期间云物理激光雷达在风暴中采样的顶部 150 米云层中的主要 CTP。案例研究展示了不同 CTT 范围（-3°C -20°C）内云顶过冷液态水的实例。含液态水的云顶 CTT 低至 -37°C。

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来源期刊

Journal of the Atmospheric Sciences 地学-气象与大气科学

CiteScore

0.20

自引率

22.60%

发文量

196

审稿时长

3-6 weeks

期刊介绍： The Journal of the Atmospheric Sciences (JAS) publishes basic research related to the physics, dynamics, and chemistry of the atmosphere of Earth and other planets, with emphasis on the quantitative and deductive aspects of the subject. The links provide detailed information for readers, authors, reviewers, and those who wish to submit a manuscript for consideration.