River runoff, sea ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean

Brenda Ekwurzel, Peter Schlosser, Richard A. Mortlock, Richard G. Fairbanks, James H. Swift

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

Hydrographic and tracer data collected during ARKIV/3 (FS Polarstern in 1987), ARCTIC91 (IB Oden), and AOS94 (CCGS Louis S. St-Laurent) expeditions reveal the evolution of the near-surface waters in the Arctic Ocean during the late 1980s and early 1990s. Salinity, nutrients, dissolved oxygen, and δ18O data are used to quantify the components of Arctic freshwater: river runoff, sea ice meltwater, and Pacific water. The calculated river runoff fractions suggest that in 1994 a large portion of water from the Pechora, Ob, Yenisey, Kotuy, and Lena Rivers did not flow off the shelf closest to their river deltas, but remained on the shelf and traveled via cyclonic circulation into the Laptev and East Siberian Seas. River runoff flowed off the shelf at the Lomonosov Ridge and most left the shelf at the Mendeleyev Ridge. ARCTIC91 and AOS94 Pacific water fraction estimates of Upper Halocline Water, the traditionally defined core of the Pacific water mass, document a decrease in extent compared to historical data. The front between Atlantic water and Pacific water shifted from the Lomonosov Ridge location in 1991 to the Mendeleyev Ridge in 1994. The relative age structure of the upper waters is described by using the 3H-3He age. The mean 3H-3He age measured in the halocline within the salinity surface of 33.1 ± 0.3 is 4.3 ± 1.7 years and that for the 34.2 ± 0.2 salinity surface is 9.6 ± 4.6 years. Lateral variations in the relative age structure within the halocline and Atlantic water support the well-known cyclonic boundary current circulation.

Original languageEnglish (US)
Article number1999JC000024
Pages (from-to)9075-9092
Number of pages18
JournalJournal of Geophysical Research: Oceans
Volume106
Issue numberC5
StatePublished - May 15 2001
Externally publishedYes

Fingerprint

Arctic Ocean
Sea ice
sea ice
snowmelt
water distribution
drainage
Runoff
meltwater
rivers
Arctic region
residence time
runoff
ice
Rivers
Water
river
halocline
water
shelves
ridges

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Aquatic Science
  • Ecology
  • Condensed Matter Physics
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Materials Chemistry
  • Palaeontology

Cite this

Ekwurzel, B., Schlosser, P., Mortlock, R. A., Fairbanks, R. G., & Swift, J. H. (2001). River runoff, sea ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean. Journal of Geophysical Research: Oceans, 106(C5), 9075-9092. [1999JC000024].

River runoff, sea ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean. / Ekwurzel, Brenda; Schlosser, Peter; Mortlock, Richard A.; Fairbanks, Richard G.; Swift, James H.

In: Journal of Geophysical Research: Oceans, Vol. 106, No. C5, 1999JC000024, 15.05.2001, p. 9075-9092.

Research output: Contribution to journalArticle

Ekwurzel, B, Schlosser, P, Mortlock, RA, Fairbanks, RG & Swift, JH 2001, 'River runoff, sea ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean', Journal of Geophysical Research: Oceans, vol. 106, no. C5, 1999JC000024, pp. 9075-9092.
Ekwurzel, Brenda ; Schlosser, Peter ; Mortlock, Richard A. ; Fairbanks, Richard G. ; Swift, James H. / River runoff, sea ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean. In: Journal of Geophysical Research: Oceans. 2001 ; Vol. 106, No. C5. pp. 9075-9092.
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