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

TitleSPCZ zonal events and downstream influence on surface ocean conditions in the Indonesian Throughflow region
Publication TypeJournal Article
Year of Publication2017
AuthorsLinsley B.K, Wu H.C, Rixen T., Charles CD, Gordon A.L, Moore M.D
JournalGeophysical Research Letters
Volume44
Pagination293-303
Date Published2017/01
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000393954900035
Keywordsbands; climate; enso; holocene; o-18; oscillation; pacific convergence zone; pathways; Porites coral; sea; South Pacific Convergence Zone; SPCZ; SPCZ zonal events; variability; water
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 O-18 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 >4000km to the east. During these events, the SPCZ dramatically rotates similar to 15 degrees 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 O-18 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.

DOI10.1002/2016gl070985
Student Publication: 
No
sharknado