Japan Geoscience Union Meeting 2016

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International Session (Poster)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG08] Continental-Oceanic Mutual Interaction: Global-scale Material Circulation through River * Runoff

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Yosuke Yamashiki(Global Water Resources Assessment Laboratory - Yamashiki Laboratory Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University), Yukio Masumoto(Graduate School of Science, The University of Tokyo), Yasumasa Miyazawa(Japan Agency for Marine-Earth Science and Technology), Swadhin Behera(Climate Variation Predictability and Applicability Research Group, Application Laboratory, JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001), Toshio Yamagata(Japan Agency for Marine-Earth Science and Technology), Kaoru Takara(Disaster Prevention Research Institute, Kyoto University)

5:15 PM - 6:30 PM

[ACG08-P09] The Unusual wet summer of 2014 in Southern Europe

*Satyaban Bishoyi Ratna1, J. V. Ratnam1, S. K. Behera1, Annalisa Cherchi2, Wanqiu Wang3, Toshio Yamagata1 (1.Application Laboratory/JAMSTEC, 2.Istituto Nazionale di Geofisica e Vulcanologia (INGV), 3.Climate Prediction Center, NOAA/NWS/NCEP)

Keywords:Wet summer, Southern Europe, Pacific Ocean, teleconnection

Southern Europe (Italy and the surrounding countries) experienced an unusual wet summer during 2014. The monthly total rainfall in July 2014 was 84% higher (about three standard deviation) than normal with respect to the 1982-2013 July climatology. This caused heavy damages to agriculture, tourism and overall economy of the region. In this study, we tried to understand the mechanisms for such abnormal weather using various datasets. The anomalously high precipitation over Italy is related to the sea surface temperature (SST) anomalies in the tropical Pacific through the atmospheric teleconnections. Rossby wave activity flux analysis of the upper-level circulation shows an anomalous tropospheric quasi-stationary Rossby wave from the Pacific reaching to southern Europe and maintaining there an anomalous cyclonic circulation. This anomalous cyclonic circulation is barotropic in nature so it extends to lower atmospheric levels, weakening the seasonal high and causing heavy precipitation over the Southern Europe.