气候变化领域集成服务门户(CCPortal): On the generation of Weddell Sea polynyas in a high-resolution earth system model

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DOI	10.1175/JCLI-D-20-0229.1
	On the generation of Weddell Sea polynyas in a high-resolution earth system model
	Kurtakoti P.; Veneziani M.; Stössel A.; Weijer W.; Maltrud M.
发表日期	2021
ISSN	08948755
起始页码	2491
结束页码	2510
卷号	34 期号:7
英文摘要	Larger Weddell Sea polynyas (WSPs), differentiated in this study from the smaller Maud Rise Polynyas (MRPs) that form to the east of the prime meridian in the proximity of the Maud Rise seamount, have last been observed in the 1970s. We investigate WSPs that grow realistically out of MRPs in a high-resolution preindustrial simulation with the Energy Exascale Earth System Model, version 0.1. The formation of MRPs requires high resolution to simulate the detailed flow around Maud Rise, whereas the realistic formation of WSPs requires a model to produce MRPs. Furthermore, WSPs tend to follow periods of a prolonged buildup of a heat reservoir at depth and weakly negative wind stress curl in association with the core of the Southern Hemisphere westerlies at an anomalously northern position. While this scenario also leads to drier conditions over the central Weddell Sea, which some literature claims to be a necessary condition for the formation of WSPs, our model results indicate that open-ocean polynyas do not occur during periods of weakly negative wind stress curl despite drier atmospheric conditions. Our study supports the hypothesis noted in earlier studies that a shift from a weakly negative to a strongly negative wind stress curl over the Weddell Sea is a prerequisite for WSPs to form, together with a large heat reservoir at depth. However, the ultimate trigger is a pronounced MRP, whose associated convection creates high surface salinity anomalies that propagate westward with the flow of the Weddell Gyre. If large enough, these anomalies trigger the formation of a WSP and a pulse of newly formed Antarctic Bottom Water. © 2021 American Meteorological Society.
英文关键词	Atmosphere-ocean interaction; Climate models; Deep convection; Ocean circulation; Ocean dynamics; Southern Ocean
语种	英语
scopus关键词	Reservoirs (water); Sea ice; Wind stress; Antarctic Bottom Water; Atmospheric conditions; Earth system model; Heat reservoirs; High resolution; Southern Hemisphere; Surface salinities; Wind stress curl; Waterworks; air-sea interaction; Antarctic Bottom Water; atmosphere-ice-ocean system; climate modeling; computer simulation; convective system; formation mechanism; numerical model; oceanic circulation; polynya; sea ice; seamount; wind stress; Maud Rise; Southern Ocean; Southern Ocean; Weddell Sea
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178594
作者单位	Center for Nonlinear Studies (CNLS), Los Alamos National Laboratory, Los Alamos, NM, United States; Fluid Dynamics and Solid Mechanics (T-3), Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Oceanography, Texas A&M University, College Station, TX, United States; Computational Physics and Methods (CCS-2), Los Alamos National Laboratory, Los Alamos, NM, United States
推荐引用方式 GB/T 7714	Kurtakoti P.,Veneziani M.,Stössel A.,et al. On the generation of Weddell Sea polynyas in a high-resolution earth system model[J],2021,34(7).
APA	Kurtakoti P.,Veneziani M.,Stössel A.,Weijer W.,&Maltrud M..(2021).On the generation of Weddell Sea polynyas in a high-resolution earth system model.Journal of Climate,34(7).
MLA	Kurtakoti P.,et al."On the generation of Weddell Sea polynyas in a high-resolution earth system model".Journal of Climate 34.7(2021).