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A 2000-year leaf wax-based hydrogen isotope record from Southeast Asia suggests low frequency ENSO-like teleconnections on a centennial timescale
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper. Chulalongkorn University, Thailand.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper. Chulalongkorn University, Thailand.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper.
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Antal upphovsmän: 62016 (Engelska)Ingår i: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 148, s. 44-53Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Limited understanding of the complex dynamics of the tropical monsoon exists, partly due to inadequate paleo (hydro)-climate proxy data from monsoonal regions. This study presents a 2000-year long record of hydrogen isotope values of leaf wax (delta D-wax) from a sedimentary sequence recovered from Lake Pa Kho, Northern Thailand. Evaluation of present day rainfall patterns and water isotope data indicates that delta D-wax reflects the amount of rainfall and is also influenced by El Nino-Southern Oscillation (ENSO) dynamics. Over the last 2000 years, wettest conditions occurred between ca. 700 AD and ca. 1000 AD, whereas the driest intervals lasted from ca. 50 BCE to ca. 700 AD and from ca. 1300 AD to ca. 1500 AD. Further investigations to establish the spatiotemporal variability of ENSO within the wider tropical Asian-Pacific realm over centennial timescales revealed a low-frequency-tripole pattern between mainland SE Asia (MSEA), the tropical West Pacific, and the central-eastern Pacific, with a wetter than normal MSEA during El Nino-like climate conditions. This pattern stands in contrast to the annual event where El Nino cause drier conditions in MSEA. We hypothesize that on centennial timescales the land-sea contrast, which drives monsoon intensity in MSEA, is modulated by the latitudinal shift of the Walker circulation and associated ENSO dynamics.

Ort, förlag, år, upplaga, sidor
2016. Vol. 148, s. 44-53
Nyckelord [en]
Plant wax ID, Plant wax delta C-13, Hydroclimate, Mainland Southeast Asia, Pacific Walker Circulation, El Nino-Southern Oscillation
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-135186DOI: 10.1016/j.quascirev.2016.07.002ISI: 000383313100004OAI: oai:DiVA.org:su-135186DiVA, id: diva2:1048620
Tillgänglig från: 2016-11-21 Skapad: 2016-11-01 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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Av författaren/redaktören
Yamoah, Kweku A.Chabangborn, AkkaneewutChawchai, SakonvanSchenk, FrederikWohlfarth, BarbaraSmittenberg, Rienk H.
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Institutionen för geologiska vetenskaper
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Quaternary Science Reviews
Geovetenskap och miljövetenskap

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