利用CFMIP观测模拟器包评估共形立方大气模式中的云

IF 3.5 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
S. C. H. Truong, M. Thatcher
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引用次数: 0

摘要

利用CFMIP观测模拟器包(COSP),利用共形立方大气模式(CCAM)在105 km分辨率下的单矩(SM)和双矩(DM)微物理方案对CALIPSO-GOCCP和CloudSat观测结果进行了云量和云相的评估。这两种方案都展示了再现液态云和冰云的技巧。然而,中高层液体云的持续不足仍然存在,导致对总云量的低估,特别是在热带地区。SM和DM方案之间的比较突出了两个关键改进。首先,DM-CCAM与副热带东部海域超过60%的低层云分量具有较好的一致性。其次,它提供了一个更准确的代表冰云量从30°向两极。对热带暖池、东南太平洋副热带层积云区和南大洋上空云层垂直结构的进一步研究揭示了CCAM模拟的系统性偏差。值得注意的是,该模式倾向于过度生成对流层上层的光学厚云,而对光学薄云的描述不足。此外,该模式模拟的毛毛雨和小雨的出现频率较高,对流层下层非降水云的出现频率较低。未来的工作将探索水平分辨率增加(例如4公里)对CORDEX-Australasia域内云特征的影响,这可以进一步了解模型性能并为改进提供信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of Clouds in the Conformal Cubic Atmospheric Model Using the CFMIP Observation Simulator Package

Evaluation of Clouds in the Conformal Cubic Atmospheric Model Using the CFMIP Observation Simulator Package

Cloud amounts and cloud phases reproduced from single-moment (SM) and double-moment (DM) microphysics schemes within Conformal Cubic Atmospheric Model (CCAM) at 105 km resolution are evaluated against CALIPSO-GOCCP and CloudSat observations using the CFMIP Observation Simulator Package (COSP). Both schemes demonstrate skill in reproducing liquid and ice clouds. However, a persistent deficiency in mid- and high-level liquid clouds remains, contributing to an underestimation of total cloud cover, particularly in the tropics. A comparison between the SM and DM schemes highlights two key improvements. First, DM-CCAM exhibits better agreement with observed low-level cloud fractions exceeding 60% in the eastern subtropical oceans. Second, it provides a more accurate representation of ice cloud amounts from 30° toward the poles. Further investigation into the vertical structure of clouds over the Tropical Warm Pool, Southeast Pacific Subtropical Stratocumulus region, and Southern Ocean reveals systematic biases in both CCAM simulations. Notably, the model tends to overproduce optically thick clouds while underrepresenting optically thin clouds in the upper troposphere. Additionally, the model simulates a higher occurrence of drizzle and light rain, along with a lower frequency of non-precipitating clouds in the lower troposphere. Future work will explore the impact of increased horizontal resolution (e.g., 4 km) on cloud characteristics within the CORDEX-Australasia domain, which could provide further insights into model performance and inform refinements.

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来源期刊
International Journal of Climatology
International Journal of Climatology 地学-气象与大气科学
CiteScore
7.50
自引率
7.70%
发文量
417
审稿时长
4 months
期刊介绍: The International Journal of Climatology aims to span the well established but rapidly growing field of climatology, through the publication of research papers, short communications, major reviews of progress and reviews of new books and reports in the area of climate science. The Journal’s main role is to stimulate and report research in climatology, from the expansive fields of the atmospheric, biophysical, engineering and social sciences. Coverage includes: Climate system science; Local to global scale climate observations and modelling; Seasonal to interannual climate prediction; Climatic variability and climate change; Synoptic, dynamic and urban climatology, hydroclimatology, human bioclimatology, ecoclimatology, dendroclimatology, palaeoclimatology, marine climatology and atmosphere-ocean interactions; Application of climatological knowledge to environmental assessment and management and economic production; Climate and society interactions
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