Inter-annual variation of tropical cyclones simulated by GEOS-5 AGCM with modified convection scheme 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
International Journal of Climatology: A Journal of the Royal Meteorological Society
年/卷/期
2019 / 39 / 10
页码
4041-4057
ISSN号
0899-8418
作者单位
Ulsan Natl Inst Sci & Technol, Sch Urban & Environm Engn, 50 UNIST Gil, Ulsan 689798, South Korea;Ulsan Natl Inst Sci & Technol, Sch Urban & Environm Engn, 50 UNIST Gil, Ulsan 689798, South Korea;Ulsan Natl Inst Sci & Technol, Sch Urban & Environm Engn, 50 UNIST Gil, Ulsan 689798, South Korea;NASA, Global Modeling & Assimilat Off, Goddard Space Flight Ctr, Greenbelt, MD USA;NASA, Global Modeling & Assimilat Off, Goddard Space Flight Ctr, Greenbelt, MD USA;NASA, Global Modeling & Assimilat Off, Goddard Space Flight Ctr, Greenbelt, MD USA;
作者
Seo, Eunkyo;Lee, Myong-In;Kim, Dongmin;Lim, Young-Kwon;Schubert, Siegfried D.;Kim, Kyu-Myong;
摘要
The Goddard Earth Observing System version 5 (GEOS-5) global climate model with a 50-km horizontal resolution is forced by observed sea surface temperature (SST) to examine the fidelity of the seasonal-mean and inter-annual variation of tropical cyclones (TCs) in the western North Pacific (WNP) and the North Atlantic (NATL). The standard Relaxed Arakawa Schubert (RAS) deep convection scheme is modified to improve the representation of TCs, where the scheme implements a stochastic limit of the cumulus entrainment rate. The modification drives mid- and upper-tropospheric cooling and low- to mid-tropospheric drying in the background state, which tends to increase atmospheric instability. This enables the model to increase convective variability on an intra-seasonal timescale and improve the simulation of intense storms. Five-member ensemble runs with the modified RAS scheme for 12years (1998-2009) exhibit realistic spatial distributions in the climatological-mean TC development area and their pathways over WNP and NATL. The GCM is able to reproduce the inter-annual variation of accumulated cyclone energy (ACE) by prescribing yearly varying observed SST even though the individual TC intensity is still underpredicted. A sensitivity of TC activity to El Nino-Southern Oscillation (ENSO) phase is also reproduced realistically over WNP in terms of the spatial pattern changes in the main development region and TC pathways. However, the model exhibits a notable deficiency in NATL in reproducing the observed inter-annual variation of TC activity and the sensitivity to the ENSO.
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关键词/主题词
accumulated cyclone energy;convection scheme;global climate model;inter-annual variation;tropical cyclone;
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