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Climate over mainland Southeast Asia 10.5–5 ka
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
2014 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 29, no 5, 445-454 p.Article in journal (Refereed) Published
Abstract [en]

We assembled and evaluated Holocene palaeo-vegetation records regarding semi-quantitative precipitation and temperature for mainland Southeast Asia and compared these with precipitation reconstructions for the Indian Ocean (IOM) and East Asian (EAM) monsoon sub-systems. Our results indicate that temperatures and precipitation in mainland Southeast Asia generally exceeded 18 °C and 1100 mm a−1 during the Holocene. Mainland Southeast Asia experienced cool/wet climatic conditions between 10.5 and 10 ka BP, a warmer/drier climate between 10 and 9 ka BP, cooler/wetter conditions between 9 and 7 ka BP, and moderately warmer/drier conditions since 7 ka BP. The reconstructed summer monsoon intensity compares well with the reconstructed hydroclimate for the EAM region, but diverges from that of the IOM region between 10.5 and 9 ka BP and 7–6.5 ka BP. This discrepancy is explained by differences in land–sea configuration, and regional sea-level history. A strengthening/weakening of the Asian summer monsoon between 9 and 7 ka BP and after 6.5 ka BP, respectively, is observed across the whole Asian monsoon region. Our new data sets support an asynchronous onset of the Asian summer monsoon optimum.

Place, publisher, year, edition, pages
2014. Vol. 29, no 5, 445-454 p.
Keyword [en]
Asian monsoon, biome, Holocene, hydroclimate, mainland Southeast Asia, palaeovegetation
National Category
Climate Research
Research subject
Marine Geoscience
Identifiers
URN: urn:nbn:se:su:diva-107133DOI: 10.1002/jqs.2715ISI: 000340596900006OAI: oai:DiVA.org:su-107133DiVA: diva2:743169
Available from: 2014-09-03 Created: 2014-09-03 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Asian monsoon over mainland Southeast Asia in the past 25 000 years
Open this publication in new window or tab >>Asian monsoon over mainland Southeast Asia in the past 25 000 years
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The objective of this research is to interpret high-resolution palaeo-proxy data sets to understand the Asian summer monsoon variability in the past. This was done by synthesizing published palaeo-records from the Asian monsoon region, model simulation comparisons, and analysing new lake sedimentary records from northeast Thailand.

Palaeo-records and climate modeling indicate a strengthened summer monsoon over Mainland Southeast Asia during the Last Glacial Maximum (LGM), compared to dry conditions in other parts of the Asian monsoon region. This can be explained by the LGM sea level low stand, which exposed Sundaland and created a large land-sea thermal contrast. Sea level rise ~19 600 years before present (BP), reorganized the atmospheric circulation in the Pacific Ocean and weakened the summer monsoon between 20 000 and 19 000 years BP.

Both the Mainland Southeast Asia and the East Asian monsoon hydroclimatic records point to an earlier Holocene onset of strengthened summer monsoon, compared to the Indian Ocean monsoon. The asynchronous evolution of the summer monsoon and a time lag of 1500 years between the East Asian and the Indian Ocean monsoon can be explained by the palaeogeography of Mainland Southeast Asia, which acted as a land bridge for the movement of the Intertropical Convergence Zone.

The palaeo-proxy records from Lake Kumphawapi compare well to the other data sets and suggest a strengthened summer monsoon between 10 000 and 7000 years BP and a weakening of the summer monsoon thereafter. The data from Lake Pa Kho provides a picture of summer monsoon variability over 2000 years. A strengthened summer monsoon prevailed between BC 170-AD 370, AD 800-960 and since AD 1450, and was weaker about AD 370-800 and AD 1300-1450. The movement of the mean position of the Intertropical Convergence Zone explains shifts in summer monsoon intensity, but weakening of the summer monsoon between 960 and 1450 AD could be affected by changes in the Walker circulation.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2014. 61 p.
Series
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 353
Keyword
Asian monsoon, ITCZ, palaeo-vegetation, palaeoclimate, lake sediment, Last Glacial Maximum, Holocene
National Category
Climate Research
Research subject
Marine Geoscience
Identifiers
urn:nbn:se:su:diva-107136 (URN)978-91-7447-969-0 (ISBN)
Public defence
2014-10-10, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 621-2008-2855Swedish Research Council, 348-2008-6071Swedish Research Council, 621-2011-4684
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript..

Available from: 2014-09-18 Created: 2014-09-03 Last updated: 2016-01-27Bibliographically approved

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