JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS06] [EE] Evolution and variability of Asian Monsoon and its linkage with Cenozoic global cooling

Tue. May 23, 2017 3:30 PM - 5:00 PM A09 (Tokyo Bay Makuhari Hall)

convener:Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Christian Betzler(University of Hamburg), Peter Dominic Clift(Louisiana State University), Chairperson:Peter Clift(Louisiana State University), Chairperson:Kenji Matsuzaki(Department of Earth and Planetary Science, Graduate School of Science, the University of Tokyo)

3:30 PM - 3:45 PM

[MIS06-06] Tropical western Pacific hydrology during the last 6000 years based on charcoal records from Borneo

*Masanobu Yamamoto1, Takafumi Kikuchi1, Hiromichi Sakura1, Ryoma Hayashi2, Osamu Seki3, Takayuki Omari4, Abdullah Sulaiman5, Hasrizal Bin Shaari6, Lurie Melling7 (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Lake Biwa Museum, Japan, 3.Low Temperature Research Institute, Hokkaido University, Japan, 4.The University Museum, The University of Tokyo, Japan, 5.Minerals and Geoscience Department Malaysia, Malaysia, 6.Universiti Malaysia Terengganu, Malaysia, 7.Tropical Peat Research Institute, Malaysia)

Keywords:Tropical, Climate, Charcoal

Tropical western Pacific region is a heat source of Earth’s surface and potentially plays a major role in global climate change. Precipitation in Borneo is controlled by both El Nino-Southern Oscillation and the East Asian winter monsoon associated with latitudinal migration of the intertropical convergence zone. In this study, we generated a 6200-year long charcoal record from three different sites in northwestern Borneo that shows large fluctuation in charcoal abundance. Two different sites at 460 km distance show common abundance peaks, suggesting that climate change regulated wild fire frequency. The abundance peak appeared every several hundred years, showing a 560-year periodicity. The peaks correspond well to those of the frequency of El Niño-induced flooding in an Ecuadorian lake (Moy et al., 2002) from 4000 to 1500 year BP, but the correspondence is not significant in other periods. There is no clear correspondence with the East Asian summer and winter monsoon records. We suggest that multi-centennial scale changes in the frequency of El Niño was a factor controlling precipitation in northwestern Borneo and the frequency of wildfires in the peatlands.