气候变化领域集成服务门户(CCPortal): Re-emergence of North Atlantic subsurface ocean temperature anomalies in a seasonal forecast system

CCPortal

DOI	10.1007/s00382-019-04826-w
	Re-emergence of North Atlantic subsurface ocean temperature anomalies in a seasonal forecast system
	Grist J.P.; Sinha B.; Hewitt H.T.; Duchez A.; MacLachlan C.; Hyder P.; Josey S.A.; Hirschi J.J.-M.; Blaker A.T.; New A.L.; Scaife A.A.; Roberts C.D.
发表日期	2019
ISSN	0930-7575
起始页码	4799
结束页码	4820
卷号	53 期号:2020-07-08
英文摘要	A high-resolution coupled ocean atmosphere model is used to study the effects of seasonal re-emergence of North Atlantic subsurface ocean temperature anomalies on northern hemisphere winter climate. A 50-member control ensemble is integrated from 1 September 2007 to 28 February 2008 and compared with a parallel ensemble with perturbed ocean initial conditions. The perturbation consists of a density-compensated subsurface Atlantic temperature anomaly corresponding to the observed subsurface temperature anomaly for September 2010. The experiment is repeated for two atmosphere horizontal resolutions (~ 60 km and ~ 25 km) in order to determine whether the sensitivity of the atmosphere to re-emerging temperature anomalies is dependent on resolution. A wide range of re-emergence behavior is found within the perturbed ensembles. While the observations seem to indicate that most of the re-emergence is occurring in November, most members of the ensemble show re-emergence occurring later in the winter. However, when re-emergence does occur it is preceded by an atmospheric pressure pattern that induces a strong flow of cold, dry air over the mid-latitude Atlantic, and enhances oceanic latent heat loss. In response to re-emergence (negative SST anomalies), there is reduced latent heat loss, less atmospheric convection, a reduction in eddy kinetic energy and positive low-level pressure anomalies downstream. Within the framework of a seasonal forecast system the results highlight the atmospheric conditions required for re-emergence to take place and the physical processes that may lead to a significant effect on the winter atmospheric circulation. © 2019, The Author(s).
英文关键词	Climate model; Re-emergence; Seasonal forecasting
语种	英语
scopus关键词	atmospheric circulation; atmospheric pressure; climate modeling; forecasting method; sea surface temperature; seasonal variation; temperature anomaly; winter; Atlantic Ocean; Atlantic Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145943
作者单位	National Oceanography Centre, European Way, Southampton, SO14 3ZH, United Kingdom; Met Office, Hadley Centre, Fitzroy Road, Exeter, EX1 3PB, United Kingdom; College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; European Centre for Medium Range Weather Forecasts (ECMWF), Shinfield Park, Reading, United Kingdom
推荐引用方式 GB/T 7714	Grist J.P.,Sinha B.,Hewitt H.T.,et al. Re-emergence of North Atlantic subsurface ocean temperature anomalies in a seasonal forecast system[J],2019,53(2020-07-08).
APA	Grist J.P..,Sinha B..,Hewitt H.T..,Duchez A..,MacLachlan C..,...&Roberts C.D..(2019).Re-emergence of North Atlantic subsurface ocean temperature anomalies in a seasonal forecast system.Climate Dynamics,53(2020-07-08).
MLA	Grist J.P.,et al."Re-emergence of North Atlantic subsurface ocean temperature anomalies in a seasonal forecast system".Climate Dynamics 53.2020-07-08(2019).