Affordable Access

deepdyve-link
Publisher Website

Land Ice Freshwater Budget of the Arctic and North Atlantic Oceans: 1. Data, Methods, and Results.

Authors
  • Bamber, J L1
  • Tedstone, A J1
  • King, M D2
  • Howat, I M2
  • Enderlin, E M3
  • van den Broeke, M R4
  • Noel, B4
  • 1 School of Geographical Sciences University of Bristol Bristol UK.
  • 2 Byrd Polar Research Center Ohio State University Columbus OH USA.
  • 3 School of Earth and Climate Sciences University of Maine Orono ME USA.
  • 4 Institute for Marine and Atmospheric Research Utrecht University Utrecht Netherlands. , (Netherlands)
Type
Published Article
Journal
Journal of Geophysical Research Oceans
Publisher
American Geophysical Union
Publication Date
Mar 01, 2018
Volume
123
Issue
3
Pages
1827–1837
Identifiers
DOI: 10.1002/2017JC013605
PMID: 29938150
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The freshwater budget of the Arctic and sub-polar North Atlantic Oceans has been changing due, primarily, to increased river runoff, declining sea ice and enhanced melting of Arctic land ice. Since the mid-1990s this latter component has experienced a pronounced increase. We use a combination of satellite observations of glacier flow speed and regional climate modeling to reconstruct the land ice freshwater flux from the Greenland ice sheet and Arctic glaciers and ice caps for the period 1958-2016. The cumulative freshwater flux anomaly exceeded 6,300 ± 316 km3 by 2016. This is roughly twice the estimate of a previous analysis that did not include glaciers and ice caps outside of Greenland and which extended only to 2010. From 2010 onward, the total freshwater flux is about 1,300 km3/yr, equivalent to 0.04 Sv, which is roughly 40% of the estimated total runoff to the Arctic for the same time period. Not all of this flux will reach areas of deep convection or Arctic and Sub-Arctic seas. We note, however, that the largest freshwater flux anomalies, grouped by ocean basin, are located in Baffin Bay and Davis Strait. The land ice freshwater flux displays a strong seasonal cycle with summer time values typically around five times larger than the annual mean. This will be important for understanding the impact of these fluxes on fjord circulation, stratification, and the biogeochemistry of, and nutrient delivery to, coastal waters.

Report this publication

Statistics

Seen <100 times