气候变化领域集成服务门户(CCPortal): The Major Role of Air-Sea Heat Fluxes in Driving Interannual Variations of Gulf Stream Transport

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DOI	10.1029/2019JC016004
	The Major Role of Air-Sea Heat Fluxes in Driving Interannual Variations of Gulf Stream Transport
	Jacobs Z.L.; Grist J.P.; Marsh R.; Sinha B.; Josey S.A.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	The Gulf Stream (GS) is central to the global redistribution of heat due to the transport of large volumes of warm water from the tropics to high latitudes and the extreme ocean heat loss to the atmosphere. This study assesses the extent to which winter surface heat fluxes and wind stress curl can drive interannual variations of the full-depth GS transport. Intensification of the GS has been observed (e.g., April 1977) immediately after a winter of frequent cold air outbreaks that led to a deepening of the mixed layer and subsequent steepening of meridional temperature gradients to the south of the GS. This forcing process is further investigated here using the ORCA12 hindcast (1978–2010) from the global, eddy-resolving, ocean-only Nucleus for European Modeling of the Ocean model in order to understand GS forcing mechanisms. Lagrangian analysis is also undertaken to examine the impact on the southern recirculation gyre. Results show that surface heat fluxes and wind stress curl can act in concert to effect year-to-year changes of up to 38% of the spring GS transport at 70°W. However, anomalous heat losses (∼200 Wm-2) over the western Subtropical Gyre are found to be the dominant cause of peaks in GS transport via two mechanisms: (1) a strengthening of cross-stream density gradients on the northern flank of the GS from an intense cooling (up to 4°C) in the Slope Water and (2) a westward intensification of the southern recirculation, which can also limit the formation of deeper mixed layers to the south of the GS near 70°W. © 2020. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186605
作者单位	National Oceanography Centre, Southampton, United Kingdom; University of Southampton, Southampton, United Kingdom
推荐引用方式 GB/T 7714	Jacobs Z.L.,Grist J.P.,Marsh R.,et al. The Major Role of Air-Sea Heat Fluxes in Driving Interannual Variations of Gulf Stream Transport[J],2020,125(11).
APA	Jacobs Z.L.,Grist J.P.,Marsh R.,Sinha B.,&Josey S.A..(2020).The Major Role of Air-Sea Heat Fluxes in Driving Interannual Variations of Gulf Stream Transport.Journal of Geophysical Research: Oceans,125(11).
MLA	Jacobs Z.L.,et al."The Major Role of Air-Sea Heat Fluxes in Driving Interannual Variations of Gulf Stream Transport".Journal of Geophysical Research: Oceans 125.11(2020).