The Etesians: from observations to reanalysis
The Etesians: from observations to reanalysis
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Etesians：从观察到重新分析
DOI：
10.1007/s00382-015-2920-7
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发表时间：
2016
期刊：
影响因子：
4.6
通讯作者：
J. Luterbacher
中科院分区：
文献类型：
--
作者：
Stella Dafka;E. Xoplaki;A. Toreti;P. Zanis;E. Tyrlis;C. Zerefos;J. Luterbacher
摘要埃特西斯风是在较低的对流层中最持久的区域尺度风系统之一，在延长的夏季吹过爱琴海。在这项研究中，我们评估了三种不同的再分析产品（二十世纪世纪再分析，20 CR; 40年欧洲中期天气预报中心，ECMWF，再分析，ERA 40;和最近发布的ECMWF再分析ERA-20 C）在捕捉Ewind系统的性能。使用了希腊24个观测站每3小时的数据
并与1971年至2000年夏季（5月至9月）的再分析结果进行了比较。提供了一个客观的分类Etesians的基础上的爱琴海的压力差。分类的Ehrs天，然后调查以及相关的大尺度大气环流。结果突出的能力，调查再分析，以充分描述的Escherichia的气象制度。强烈的Etesians与更强的位势高度异常超过西欧中部和地中海东部，并与急流的平均位置的显着变化。最后，车站的时间序列提供的证据表明，不太频繁的激烈的Ehrs天结束时，延长夏季。
AbstractThe Etesians are among the most persistent regional scale wind systems in the lower troposphere that blow over the Aegean Sea during the extended summer season. In this study we evaluate the performance of three different reanalysis products (the twentieth century reanalysis, 20CR; the 40-year European Centre for Medium-Range Weather Forecasts, ECMWF, Re-Analysis, ERA40; and the recently released ECMWF reanalysis ERA-20C) in capturing the Etesian wind system. Three-hourly data from 24 stations over Greece are used
and compared with reanalysis outputs for the extended summer season (May–September) from 1971 to 2000. An objective classification of Etesians based on the pressure difference over the Aegean is provided. Classified Etesian days are then investigated as well as the associated large scale atmospheric circulation. Results highlight the ability of the investigated reanalyses to adequately describe the Etesian meteorological regimes. Intense Etesians are associated with stronger geopotential height anomalies over western-central Europe and the Eastern Mediterranean and with pronounced changes in the mean position of the jet streams. Finally, station time series provide evidence for less frequent intense Etesian days at the end of the extended summer season.