新的再分析数据集(CRA40)中全球热带气旋活动的保真度

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Jinxiao Li, Qun Tian, Zili Shen, Yongfang Xu, Zixiang Yan, Majun Li, Chuandong Zhu, Jiaqing Xue, Zouxing Lin, Yaoxian Yang, Lingjun Zeng
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引用次数: 0

摘要

这项研究系统地评估了新的全球大气再分析数据集 "40 年全球再分析"(CRA40)中的全球热带气旋(TC)活动与最佳路径数据的对比情况。为了进行比较,还评估了四个最先进的再分析--ERA5、JRA55、CFSR 和 MERRA2。结果表明,CRA40 和其他再分析都普遍低估了全球热带气旋的生成频率和强度。对热气旋生成频率的空间分布、季节性、年际变化和长期趋势,以及热气旋强度的风压关系的详细研究,揭示了这些再分析数据集之间的异同。总体而言,CRA40 在这些方面与其他再分析相比并没有表现出明显的优势,但其偏差也并不明显。然而,在TC平移速度方面,CRA40却优于其他再分析,其在带状平均模式、峰值纬度的经向分布和年际变化方面与观测结果高度一致,表明其在捕捉大尺度大气特征方面具有合理的能力。我们的研究结果表明,在其局限性范围内,使用 CRA40 进行与 TC 相关的研究是合适的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fidelity of global tropical cyclone activity in a new reanalysis dataset (CRA40)

Fidelity of global tropical cyclone activity in a new reanalysis dataset (CRA40)

This study systematically evaluated global tropical cyclone (TC) activity in a new global atmospheric reanalysis dataset named the “40-year Global Reanalysis” (CRA40) against the best track data. For comparison, four state-of-the-art reanalyses—ERA5, JRA55, CFSR, and MERRA2—were also assessed. The results showed that there is a general underestimation of global TC genesis frequency and intensity in both CRA40 and other reanalyses. A detailed investigation of spatial distribution, seasonality, interannual variation, and long-term trend for TC genesis frequency, as well as pressure–wind relationship for TC intensity, revealed similarities and differences among these reanalyses datasets. Overall, CRA40 does not exhibit clear advantages over other reanalyses in these aspects, but its biases are also not more pronounced. However, regarding TC translation speed, CRA40 outpeforms other reanalyses, evident by its high level of consistency with the observation in the zonal average pattern, meridional distribution at peak latitudes, and interannual variation, suggesting its reasonable capability in capturing large-scale atmospheric characteristics. Our findings indicate that the use of CRA40 is appropriate for conducting TC-related studies, within the scope of its limitations.

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来源期刊
Meteorological Applications
Meteorological Applications 地学-气象与大气科学
CiteScore
5.70
自引率
3.70%
发文量
62
审稿时长
>12 weeks
期刊介绍: The aim of Meteorological Applications is to serve the needs of applied meteorologists, forecasters and users of meteorological services by publishing papers on all aspects of meteorological science, including: applications of meteorological, climatological, analytical and forecasting data, and their socio-economic benefits; forecasting, warning and service delivery techniques and methods; weather hazards, their analysis and prediction; performance, verification and value of numerical models and forecasting services; practical applications of ocean and climate models; education and training.
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