Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho

Sakonvan Chawchai; Akkaneewut Chabangborn; Sherilyn Fritz; Minna Väliranta; Carl-Magnus Mörth; Maarten Blaauw; Paula J. Reimer; Paul J. Krusic; Ludvig Löwemark; Barbara Wohlfarth

doi:10.1016/j.quascirev.2015.01.007

Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho

Sakonvan Chawchai^*, Akkaneewut Chabangborn, Sherilyn Fritz, Minna Väliranta, Carl-Magnus Mörth, Maarten Blaauw, Paula J. Reimer, Paul J. Krusic, Ludvig Löwemark, Barbara Wohlfarth

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The Southeast Asian mainland is located in the central path of the Asian summer monsoon, a region where paleoclimatic data are still sparse. Here we present a multi-proxy (TOC, C/N, δ¹³C, biogenic silica, and XRF elemental data) study of a 1.5m sediment/peat sequence from Lake Pa Kho, northeast Thailand, which is supported by 20 AMS ¹⁴C ages. Hydroclimatic reconstructions for Pa Kho suggest a strengthened summer monsoon between BC 170-AD 370, AD 800-960, and after AD 1450; and a weakening of the summer monsoon between AD 370-800, and AD 1300-1450. Increased run-off and a higher nutrient supply after AD 1700 can be linked to agricultural intensification and land-use changes in the region. This study fills an important gap in data coverage with respect to summer monsoon variability over Southeast Asia during the past 2000 years and enables the mean position of the Intertropical Convergence Zone (ITCZ) to be inferred based on comparisons with other regional studies. Intervals of strengthened/weaker summer monsoon rainfall suggest that the mean position of the ITCZ was located as far north as 35°N between BC 170-AD 370 and AD 800-960, whereas it likely did not reach above 17°N during the drought intervals of AD 370-800 and AD 1300-1450. The spatial pattern of rainfall variation seems to have changed after AD 1450, when the inferred moisture history for Pa Kho indicates a more southerly location of the mean position of the summer ITCZ.

Original language	English
Pages (from-to)	62-71
Number of pages	10
Journal	Quaternary Science Reviews
Volume	111
Early online date	02 Feb 2015
DOIs	https://doi.org/10.1016/j.quascirev.2015.01.007
Publication status	Published - 01 Mar 2015

Keywords

Asian monsoon
Geochemistry
Last two millennia
Paleoclimate
Wetland/peatland

ASJC Scopus subject areas

Geology
Global and Planetary Change
Ecology, Evolution, Behavior and Systematics
Archaeology
Archaeology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.quascirev.2015.01.007

Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho
© 2015 Elsevier Ltd. All rights reserved. This is an open access article published under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited.
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title = "Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho",

abstract = "The Southeast Asian mainland is located in the central path of the Asian summer monsoon, a region where paleoclimatic data are still sparse. Here we present a multi-proxy (TOC, C/N, δ13C, biogenic silica, and XRF elemental data) study of a 1.5m sediment/peat sequence from Lake Pa Kho, northeast Thailand, which is supported by 20 AMS 14C ages. Hydroclimatic reconstructions for Pa Kho suggest a strengthened summer monsoon between BC 170-AD 370, AD 800-960, and after AD 1450; and a weakening of the summer monsoon between AD 370-800, and AD 1300-1450. Increased run-off and a higher nutrient supply after AD 1700 can be linked to agricultural intensification and land-use changes in the region. This study fills an important gap in data coverage with respect to summer monsoon variability over Southeast Asia during the past 2000 years and enables the mean position of the Intertropical Convergence Zone (ITCZ) to be inferred based on comparisons with other regional studies. Intervals of strengthened/weaker summer monsoon rainfall suggest that the mean position of the ITCZ was located as far north as 35°N between BC 170-AD 370 and AD 800-960, whereas it likely did not reach above 17°N during the drought intervals of AD 370-800 and AD 1300-1450. The spatial pattern of rainfall variation seems to have changed after AD 1450, when the inferred moisture history for Pa Kho indicates a more southerly location of the mean position of the summer ITCZ.",

keywords = "Asian monsoon, Geochemistry, Last two millennia, Paleoclimate, Wetland/peatland",

author = "Sakonvan Chawchai and Akkaneewut Chabangborn and Sherilyn Fritz and Minna V{\"a}liranta and Carl-Magnus M{\"o}rth and Maarten Blaauw and Reimer, {Paula J.} and Krusic, {Paul J.} and Ludvig L{\"o}wemark and Barbara Wohlfarth",

year = "2015",

month = mar,

day = "1",

doi = "10.1016/j.quascirev.2015.01.007",

language = "English",

volume = "111",

pages = "62--71",

journal = "Quaternary Science Reviews",

issn = "0277-3791",

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Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho. / Chawchai, Sakonvan; Chabangborn, Akkaneewut; Fritz, Sherilyn; Väliranta, Minna; Mörth, Carl-Magnus; Blaauw, Maarten ; Reimer, Paula J.; Krusic, Paul J.; Löwemark, Ludvig; Wohlfarth, Barbara.

In: Quaternary Science Reviews, Vol. 111, 01.03.2015, p. 62-71.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho

AU - Chawchai, Sakonvan

AU - Chabangborn, Akkaneewut

AU - Fritz, Sherilyn

AU - Väliranta, Minna

AU - Mörth, Carl-Magnus

AU - Blaauw, Maarten

AU - Reimer, Paula J.

AU - Krusic, Paul J.

AU - Löwemark, Ludvig

AU - Wohlfarth, Barbara

PY - 2015/3/1

Y1 - 2015/3/1

N2 - The Southeast Asian mainland is located in the central path of the Asian summer monsoon, a region where paleoclimatic data are still sparse. Here we present a multi-proxy (TOC, C/N, δ13C, biogenic silica, and XRF elemental data) study of a 1.5m sediment/peat sequence from Lake Pa Kho, northeast Thailand, which is supported by 20 AMS 14C ages. Hydroclimatic reconstructions for Pa Kho suggest a strengthened summer monsoon between BC 170-AD 370, AD 800-960, and after AD 1450; and a weakening of the summer monsoon between AD 370-800, and AD 1300-1450. Increased run-off and a higher nutrient supply after AD 1700 can be linked to agricultural intensification and land-use changes in the region. This study fills an important gap in data coverage with respect to summer monsoon variability over Southeast Asia during the past 2000 years and enables the mean position of the Intertropical Convergence Zone (ITCZ) to be inferred based on comparisons with other regional studies. Intervals of strengthened/weaker summer monsoon rainfall suggest that the mean position of the ITCZ was located as far north as 35°N between BC 170-AD 370 and AD 800-960, whereas it likely did not reach above 17°N during the drought intervals of AD 370-800 and AD 1300-1450. The spatial pattern of rainfall variation seems to have changed after AD 1450, when the inferred moisture history for Pa Kho indicates a more southerly location of the mean position of the summer ITCZ.

AB - The Southeast Asian mainland is located in the central path of the Asian summer monsoon, a region where paleoclimatic data are still sparse. Here we present a multi-proxy (TOC, C/N, δ13C, biogenic silica, and XRF elemental data) study of a 1.5m sediment/peat sequence from Lake Pa Kho, northeast Thailand, which is supported by 20 AMS 14C ages. Hydroclimatic reconstructions for Pa Kho suggest a strengthened summer monsoon between BC 170-AD 370, AD 800-960, and after AD 1450; and a weakening of the summer monsoon between AD 370-800, and AD 1300-1450. Increased run-off and a higher nutrient supply after AD 1700 can be linked to agricultural intensification and land-use changes in the region. This study fills an important gap in data coverage with respect to summer monsoon variability over Southeast Asia during the past 2000 years and enables the mean position of the Intertropical Convergence Zone (ITCZ) to be inferred based on comparisons with other regional studies. Intervals of strengthened/weaker summer monsoon rainfall suggest that the mean position of the ITCZ was located as far north as 35°N between BC 170-AD 370 and AD 800-960, whereas it likely did not reach above 17°N during the drought intervals of AD 370-800 and AD 1300-1450. The spatial pattern of rainfall variation seems to have changed after AD 1450, when the inferred moisture history for Pa Kho indicates a more southerly location of the mean position of the summer ITCZ.

KW - Asian monsoon

KW - Geochemistry

KW - Last two millennia

KW - Paleoclimate

KW - Wetland/peatland

U2 - 10.1016/j.quascirev.2015.01.007

DO - 10.1016/j.quascirev.2015.01.007

M3 - Article

AN - SCOPUS:84921966888

VL - 111

SP - 62

EP - 71

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

SN - 0277-3791

ER -

Hydroclimatic shifts in northeast Thailand during the last two millennia - the record of Lake Pa Kho

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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