Regional winds over the Iberian Peninsula (Cierzo, Levante and Poniente) from high-resolution COSMO-REA6 reanalysis,International Journal of Climatology

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Regional winds over the Iberian Peninsula (Cierzo, Levante and Poniente) from high-resolution COSMO-REA6 reanalysis
International Journal of Climatology ( IF 3.5 ) Pub Date : 2022-09-12 , DOI: 10.1002/joc.7860
María Ortega ₁ , Enrique Sánchez ₂ , Claudia Gutiérrez ₃ , María Ofelia Molina ₁ , Noelia López‐Franca ₁

Affiliation

Cierzo in the Ebro Valley and Levante and Poniente in the Strait of Gibraltar are three of the main winds over the Iberian Peninsula. However, their study is difficult due to the limited amount of observational data and available literature. In addition, current reanalysis products do not usually have sufficient resolution, generally greater than 10 km, to capture the orographic characteristics of these winds. In this study we explore the ability of high-resolution COSMO-REA6 reanalysis (6 km, 0.055°) to describe Cierzo, Levante and Poniente using HadISD observational data validation whenever it was possible. A numerical definition according to the characteristics of these winds is proposed through speed and directional range thresholds. Regional winds statistics, annual cycles, wind roses and covered areas are calculated. The results show a reasonable agreement between reanalysis and observations, with an annual average of 95 Cierzo days, and around 80 Levante and Poniente days for the whole period. These windy days typically extend around 21,000 km² (or 600 reanalysis cells). Both extension and number of days present strong annual cycles and interannual variability. Several weather regimes associated to those regional wind days are obtained, in agreement with other comparable studies. Therefore, the study shows the capability of the high-resolution COSMO-REA6 reanalysis to capture and describe regional winds such as Cierzo, Levante and Poniente.

中文翻译：

来自高分辨率 COSMO-REA6 再分析的伊比利亚半岛（Cierzo、Levante 和 Poniente）的区域风

埃布罗河谷的 Cierzo 和直布罗陀海峡的 Levante 和 Poniente 是伊比利亚半岛上空的三大风。然而，由于观测数据和可用文献的数量有限，他们的研究很困难。此外，当前的再分析产品通常没有足够的分辨率（通常大于 10 公里）来捕获这些风的地形特征。在这项研究中，我们探索高分辨率 COSMO-REA6 再分析（6 公里，0.055°）的能力，以尽可能使用 HadISD 观测数据验证来描述 Cierzo、Levante 和 Poniente。通过速度和方向范围阈值提出了根据这些风的特征的数值定义。计算区域风统计数据、年度周期、风玫瑰图和覆盖面积。结果表明，再分析与观测之间存在合理的一致性，整个时期年平均 Cierzo 天数为 95 天，Levante 和 Poniente 天数约为 80 天。这些大风天通常延伸约 21,000 公里²（或 600 个再分析单元）。延长期和天数都呈现出强烈的年度周期和年际变化。与其他可比研究一致，获得了与这些区域风天相关的几种天气状况。因此，该研究显示了高分辨率 COSMO-REA6 再分析捕获和描述 Cierzo、Levante 和 Poniente 等区域风的能力。

更新日期：2022-09-12

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