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SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region

Braddock Linsley; Henry C. Wu; Tim Rixen; Christopher D. Charles; Arnold L. Gordon; Michael D. Moore

Title:
SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region
Author(s):
Linsley, Braddock
Wu, Henry C.
Rixen, Tim
Charles, Christopher D.
Gordon, Arnold L.
Moore, Michael D.
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Earth and Environmental Sciences
Volume:
44
Persistent URL:
Book/Journal Title:
Geophysical Research Letters
Geographic Area:
South Pacific Ocean
Pacific Ocean--Makasar Strait (Celebes Sea)
Abstract:
Seasonal surface freshening of the Makassar Strait, the main conduit of the Indonesian Throughflow (ITF), is a key factor controlling the ITF. Here we present a 262 year reconstruction of seasonal sea-surface-salinity variability from 1742 to 2004 Common Era by using coral δ18O records from the central Makassar Strait. Our record reveals persistent seasonal freshening and also years with significant truncations of seasonal freshening that correlate exactly with South Pacific Convergence Zone (SPCZ) zonal events >4000 km to the east. During these events, the SPCZ dramatically rotates ~15° north to near the equator and stronger westward flowing South Pacific boundary currents force higher-salinity water through the Makassar Strait in February–May halting the normal seasonal freshening in the strait. By these teleconnections, our Makassar coral δ18O series provides the first record of the recurrence interval of these zonal SPCZ events and demonstrates that they have occurred on a semiregular basis since the mid-1700s.
Subject(s):
Geophysics
Stream salinity
Ocean currents
Oceanography
Publisher DOI:
https://doi.org/10.1002/2016GL070985
Item views
25
Metadata:
text | xml
Suggested Citation:
Braddock Linsley, Henry C. Wu, Tim Rixen, Christopher D. Charles, Arnold L. Gordon, Michael D. Moore, , SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region, Columbia University Academic Commons, .

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