Mantle 3He distribution and deep circulation in the Indian Ocean

Ashwanth Srinivasan, Zafer Top, Peter Schlosser, Roland Hohmann, Mohamed Iskandarani, Donald Olson, John E. Lupton, William J. Jenkins

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The World Ocean Circulation Experiment Indian Ocean helium isotope data are mapped and features of intermediate and deep circulation are inferred and discussed. The 3He added to the deep Indian Ocean originates from (1) a strong source on the mid-ocean ridge at about 19°S/65°E, (2) a source located in the Gulf of Aden in the northwestern Indian Ocean, (3) sources located in the convergent margins in the northeastern Indian Ocean, and (4) water imported from the Indonesian Seas. The main circulation features inferred from the 3He distribution include (1) deep (2000-3000m) eastward flow in the central Indian Ocean, which overflows into the West Australian Basin through saddles in the Ninetyeast Ridge, (2) a deep (2000-3000 m) southwestward flow in the western Indian Ocean, and (3) influx of Banda Sea Intermediate Waters associated with the deep core (1000-1500 m) of the through flow from the Pacific Ocean. The large-scale 3He distribution is consonant with the known pathways of deep and bottom water circulation in the Indian Ocean.

Original languageEnglish (US)
JournalJournal of Geophysical Research C: Oceans
Volume109
Issue number6
DOIs
StatePublished - Jun 15 2004

Fingerprint

Indian Ocean
Earth mantle
mantle
Water
Helium
Isotopes
Southern Yemen
water circulation
helium isotope
helium isotopes
convergent margin
mid-ocean ridges
gulfs
Pacific Ocean
saddles
intermediate water
deep water
mid-ocean ridge
distribution
bottom water

Keywords

  • Deep circulation
  • Indian Ocean
  • Tracers

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Mantle 3He distribution and deep circulation in the Indian Ocean. / Srinivasan, Ashwanth; Top, Zafer; Schlosser, Peter; Hohmann, Roland; Iskandarani, Mohamed; Olson, Donald; Lupton, John E.; Jenkins, William J.

In: Journal of Geophysical Research C: Oceans, Vol. 109, No. 6, 15.06.2004.

Research output: Contribution to journalArticle

Srinivasan, Ashwanth ; Top, Zafer ; Schlosser, Peter ; Hohmann, Roland ; Iskandarani, Mohamed ; Olson, Donald ; Lupton, John E. ; Jenkins, William J. / Mantle 3He distribution and deep circulation in the Indian Ocean. In: Journal of Geophysical Research C: Oceans. 2004 ; Vol. 109, No. 6.
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