Abstract:
:Steep topography, a tropical climate, and mafic lithologies contribute to efficient chemical weathering and carbon sequestration in the Southeast Asian islands. Ongoing arc-continent collision between the Sunda-Banda arc system and Australia has increased the area of subaerially exposed land in the region since the mid-Miocene. Concurrently, Earth's climate has cooled since the Miocene Climatic Optimum, leading to growth of the Antarctic ice sheet and the onset of Northern Hemisphere glaciation. We seek to evaluate the hypothesis that the emergence of the Southeast Asian islands played a significant role in driving this cooling trend through increasing global weatherability. To do so, we have compiled paleoshoreline data and incorporated them into GEOCLIM, which couples a global climate model to a silicate weathering model with spatially resolved lithology. We find that without the increase in area of the Southeast Asian islands over the Neogene, atmospheric pCO2 would have been significantly higher than preindustrial values, remaining above the levels necessary for initiating Northern Hemisphere ice sheets.
journal_name
Proc Natl Acad Sci U S Aauthors
Park Y,Maffre P,Goddéris Y,Macdonald FA,Anttila ESC,Swanson-Hysell NLdoi
10.1073/pnas.2011033117subject
Has Abstractpub_date
2020-10-13 00:00:00pages
25319-25326issue
41eissn
0027-8424issn
1091-6490pii
2011033117journal_volume
117pub_type
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