Modelling a storm surge under future climate scenarios: case study of extratropical cyclone Gudrun (2005)

Martin Mäll*, Ülo Suursaar, Ryota Nakamura, Tomoya Shibayama

*この研究の対応する著者

研究成果: Article査読

16 被引用数 (Scopus)

抄録

Weather Research and Forecasting atmosphere model and Finite Volume Community Ocean Model were for the first time used under the pseudo-climate simulation approach, to study the parameters of an extreme storm in the Baltic Sea area. We reconstructed the met-ocean conditions during the historical storm Gudrun (which caused a record-high +275 cm surge in Pärnu Bay on 9 January 2005) and simulated the future equivalent of Gudrun by modifying the background conditions using monthly mean value differences in sea surface temperature (SST), atmospheric air temperature and relative humidity from MIROC5 in accordance with the IPCC scenarios RCP4.5 and RCP8.5 for 2050 and 2100. The simulated storm route and storm surge parameters were in good accordance with the observed ones. Despite expecting the continuation of recently observed intensification of cyclonic activity in winter months, our numerical simulations showed that intensity of the strongest storms and storm surges in the Baltic Sea might not increase by the end of twenty-first century. Unlike tropical cyclones, which derive their energy from the increasing SST, the extratropical cyclones (ETCs) harvest their primary energy from the thermal differences on the sides of the polar front, which may decrease if the Arctic warms up. For climatological generalizations on future ETCs, however, it is necessary to re-calculate a larger number of storms, including those with different tracks and in different thermal conditions.

本文言語English
ページ(範囲)1119-1144
ページ数26
ジャーナルNatural Hazards
89
3
DOI
出版ステータスPublished - 2017 12月 1

ASJC Scopus subject areas

  • 水の科学と技術
  • 大気科学
  • 地球惑星科学(その他)

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