气候变化领域集成服务门户(CCPortal): Arctic ocean and hudson bay freshwater exports: New estimates from seven decades of hydrographic surveys on the Labrador shelf

CCPortal

DOI	10.1175/JCLI-D-19-0083.1
	Arctic ocean and hudson bay freshwater exports: New estimates from seven decades of hydrographic surveys on the Labrador shelf
	Florindo-López C.; Bacon S.; Aksenov Y.; Chafik L.; Colbourne E.; Penny Holliday N.
发表日期	2020
ISSN	0894-8755
起始页码	8849
结束页码	8868
卷号	33 期号:20
英文摘要	While reasonable knowledge of multidecadal Arctic freshwater storage variability exists, we have little knowledge of Arctic freshwater exports on similar time scales. A hydrographic time series from the Labrador Shelf, spanning seven decades at annual resolution, is here used to quantify Arctic Ocean freshwater export variability west of Greenland. Output from a high-resolution coupled ice-ocean model is used to establish the representativeness of those hydrographic sections. Clear annual to decadal variability emerges, with high freshwater transports during the 1950s and 1970s-80s, and low transports in the 1960s and from the mid-1990s to 2016, with typical amplitudes of 30 mSv (1 Sv 5 106 m3 s21). The variability in both the transports and cumulative volumes correlates well both with Arctic and North Atlantic freshwater storage changes on the same time scale. We refer to the ''inshore branch'' of the Labrador Current as the Labrador Coastal Current, because it is a dynamically and geographically distinct feature. It originates as the Hudson Bay outflow, and preserves variability from river runoff into the Hudson Bay catchment. We find a need for parallel, long-term freshwater transport measurements from Fram and Davis Straits to better understand Arctic freshwater export control mechanisms and partitioning of variability between routes west and east of Greenland, and a need for better knowledge and understanding of year-round (solid and liquid) freshwater fluxes on the Labrador shelf. Our results have implications for wider, coherent atmospheric control on freshwater fluxes and content across the Arctic Ocean and northern North Atlantic Ocean. Ó 2020 American Meteorological Society.
英文关键词	Catchments; Ferroelectric RAM; Hydrographic surveys; International trade; Oceanography; Transportation routes; American meteorological societies; Annual resolution; Atmospheric controls; Decadal variability; Freshwater fluxes; Freshwater storages; Freshwater transports; North Atlantic Ocean; Water; annual variation; decadal variation; export; freshwater input; hydrographic survey; outflow; runoff; Arctic Ocean; Atlantic Ocean; Canada; Hudson Bay; Labrador Sea; Labrador Shelf
语种	英语
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/171092
作者单位	National Oceanography Centre, Southampton, United Kingdom; Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, St. John's, NL, Canada
推荐引用方式 GB/T 7714	Florindo-López C.,Bacon S.,Aksenov Y.,et al. Arctic ocean and hudson bay freshwater exports: New estimates from seven decades of hydrographic surveys on the Labrador shelf[J],2020,33(20).
APA	Florindo-López C.,Bacon S.,Aksenov Y.,Chafik L.,Colbourne E.,&Penny Holliday N..(2020).Arctic ocean and hudson bay freshwater exports: New estimates from seven decades of hydrographic surveys on the Labrador shelf.Journal of Climate,33(20).
MLA	Florindo-López C.,et al."Arctic ocean and hudson bay freshwater exports: New estimates from seven decades of hydrographic surveys on the Labrador shelf".Journal of Climate 33.20(2020).