Multi-scale assessment of high-resolution reanalysis precipitation fields over Italy

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2024-10-24 DOI:10.1016/j.atmosres.2024.107734

Francesco Cavalleri , Cristian Lussana , Francesca Viterbo , Michele Brunetti , Riccardo Bonanno , Veronica Manara , Matteo Lacavalla , Simone Sperati , Mario Raffa , Valerio Capecchi , Davide Cesari , Antonio Giordani , Ines Maria Luisa Cerenzia , Maurizio Maugeri

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Abstract

This study focuses on the validation of high-resolution regional reanalyses to understand their effectiveness in reproducing precipitation patterns over Italy, a climate change hotspot characterized by coastal sea-land interaction and complex orography. Nine reanalysis products were evaluated, with the ECMWF global reanalysis ERA5 serving as a benchmark. These included both European (COSMO-REA6, CERRA) and Italy-specific (BOLAM, MERIDA, MERIDA-HRES, MOLOCH, SPHERA, VHR-REA_IT) datasets, using different models and parametrizations. The inter-comparison involved determining the effective resolution of daily precipitation fields using wavelet techniques and assessing intense precipitation statistics through frequency distributions. In-situ observations and observational gridded datasets were used to independently validate reanalysis precipitation fields. The capability of reanalyses to depict daily precipitation patterns was assessed, highlighting a maximum radius of precipitation misplacement of about 15 km, with notably lower skills during summer. An overall overestimation of precipitation was identified in the reanalysis climatological fields over the Po Valley and the Alps, whereas multiple products showed an underestimation of precipitations across the North-West coast, the Apennines, and Southern Italy. Finally, a comparison with a time-consistent observational dataset (UniMi/ISAC-CNR) revealed a non-stable deviation from observations in the annual precipitation cumulate of the reanalysis products analyzed. This should be taken into account when interpreting precipitation trends over Italy.

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意大利上空高分辨率再分析降水场的多尺度评估

这项研究的重点是验证高分辨率区域再分析，以了解它们在再现意大利降水模式方面的有效性，意大利是一个气候变化热点地区，具有沿海海陆相互作用和复杂地形的特点。以 ECMWF 全球再分析 ERA5 为基准，对九种再分析产品进行了评估。这些产品包括欧洲数据集（COSMO-REA6、CERRA）和意大利数据集（BOLAM、MERIDA、MERIDA-HRES、MOLOCH、SPHERA、VHR-REA_IT），使用了不同的模型和参数。相互比较包括利用小波技术确定日降水量场的有效分辨率，并通过频率分布评估强降水统计数据。现场观测和观测网格数据集用于独立验证再分析降水场。对再分析描绘日降水模式的能力进行了评估，结果表明降水错位的最大半径约为 15 千米，夏季降水错位的能力明显较低。在波河流域和阿尔卑斯山的再分析气候场中发现，降水量总体上被高估了，而多个产品则显示西北海岸、亚平宁山脉和意大利南部的降水量被低估了。最后，与具有时间一致性的观测数据集（UniMi/ISAC-CNR）进行比较后发现，所分析的再分析产品的年降水量累积与观测数据存在不稳定的偏差。在解释意大利降水趋势时应考虑到这一点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.