气候变化领域集成服务门户(CCPortal): Local- and Large-Scale Drivers of Variability in the Coastal Freshwater Budget of the Western Antarctic Peninsula

CCPortal

DOI	10.1029/2021JC017172
	Local- and Large-Scale Drivers of Variability in the Coastal Freshwater Budget of the Western Antarctic Peninsula
	Meredith M.P.; Stammerjohn S.E.; Ducklow H.W.; Leng M.J.; Arrowsmith C.; Brearley J.A.; Venables H.J.; Barham M.; van Wessem J.M.; Schofield O.; Waite N.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	The west Antarctic Peninsula (WAP) is a region of marked climatic variability, exhibiting strong changes in sea ice extent, retreat of most of its glaciers, and shifts in the amount and form of precipitation. These changes can have significant impacts on the oceanic freshwater budget and marine biogeochemical processes; it is thus important to ascertain the relative balance of the drivers and the spatial scales over which they operate. We present a novel 7-year summer-season (October to March; 2011 to 2018) series of oxygen isotopes in seawater (δ18O), augmented with some winter sampling, collected adjacent to Anvers Island at the WAP. These data are used to attribute oceanic freshwater changes to sea ice and meteoric sources, and to deduce information on the spatial scales over which the changes are driven. Sea ice melt shows significant seasonality (∼9% range) and marked interannual changes, with pronounced maxima in seasons 2013/14 and 2016/17. Both of these extrema are driven by anomalous winds, but reflect strongly contrasting dynamic and thermodynamic sea ice responses. Meteoric water also shows seasonality (∼7% range) with interannual variability reflecting changes in the input of accumulated precipitation and glacial melt to the ocean. Unlike sea ice melt, meteoric water extremes are especially pronounced in thin (<10 m) surface layers close to the proximate glacier, associated with enhanced ocean stratification. Isotopic tracers help to deconvolve the complex spatio-temporal scales inherent in the coastal freshwater budget, and hence improve our knowledge of the separate and cumulative physical and ecological impacts. © 2021. The Authors.
英文关键词	0740 snowmelt; 0750 sea ice (4540); 0776 glaciology (1621, 1827, 1863); 4207 Arctic and Antarctic oceanography (9310, 9315); 4870 stable isotopes (0454, 1041)
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/186284
作者单位	British Antarctic Survey, Cambridge, United Kingdom; Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, United States; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; National Environmental Isotope Facility, British Geological Survey, United Kingdom and School of Biosciences, University of Nottingham, Nottingham, United Kingdom; Institute for Marine and Atmospheric Research, Utrecht, Netherlands; Rutgers University, Center of Ocean Observing Leadership, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, NJ, United States
推荐引用方式 GB/T 7714	Meredith M.P.,Stammerjohn S.E.,Ducklow H.W.,et al. Local- and Large-Scale Drivers of Variability in the Coastal Freshwater Budget of the Western Antarctic Peninsula[J],2021,126(6).
APA	Meredith M.P..,Stammerjohn S.E..,Ducklow H.W..,Leng M.J..,Arrowsmith C..,...&Waite N..(2021).Local- and Large-Scale Drivers of Variability in the Coastal Freshwater Budget of the Western Antarctic Peninsula.Journal of Geophysical Research: Oceans,126(6).
MLA	Meredith M.P.,et al."Local- and Large-Scale Drivers of Variability in the Coastal Freshwater Budget of the Western Antarctic Peninsula".Journal of Geophysical Research: Oceans 126.6(2021).