SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region
- SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region
- Linsley, Braddock
Wu, Henry C.
Charles, Christopher D.
Gordon, Arnold L.
Moore, Michael D.
- Lamont-Doherty Earth Observatory
Earth and Environmental Sciences
- Persistent URL:
- Book/Journal Title:
- Geophysical Research Letters
- Geographic Area:
- South Pacific Ocean
Pacific Ocean--Makasar Strait (Celebes Sea)
- 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.
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- Suggested Citation:
- Braddock Linsley, Henry C. Wu, Tim Rixen, Christopher D. Charles, Arnold L. Gordon, Michael D. Moore, 2017, SPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region, Columbia University Academic Commons, https://doi.org/10.7916/D8JQ2H8S.