气候变化领域集成服务门户(CCPortal): Extensive Remineralization of Peatland-Derived Dissolved Organic Carbon and Ocean Acidification in the Sunda Shelf Sea, Southeast Asia

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DOI	10.1029/2021JC017292
	Extensive Remineralization of Peatland-Derived Dissolved Organic Carbon and Ocean Acidification in the Sunda Shelf Sea, Southeast Asia
	Zhou Y.; Evans C.D.; Chen Y.; Chang K.Y.W.; Martin P.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	Southeast Asia is a hotspot of riverine export of terrigenous organic carbon to the ocean, accounting for ∼10% of the global land-to-ocean riverine flux of terrigenous dissolved organic carbon (tDOC). While anthropogenic disturbance is thought to have increased the tDOC loss from peatlands in Southeast Asia, the fate of this tDOC in the marine environment and the potential impacts of its remineralization on coastal ecosystems remain poorly understood. We collected a multi-year biogeochemical time series in the central Sunda Shelf (Singapore Strait), where the seasonal reversal of ocean currents delivers water masses from the South China Sea first before (during Northeast Monsoon) and then after (during Southwest Monsoon) they have mixed with run-off from peatlands on Sumatra. The concentration and stable isotope composition of DOC, and colored dissolved organic matter spectra, reveal a large input of tDOC to our site during Southwest Monsoon. Using isotope mass balance calculations, we show that 60%–70% of the original tDOC input is remineralized in the coastal waters of the Sunda Shelf, causing seasonal acidification. The persistent CO2 oversaturation drives a CO2 efflux of 2.4–4.9 mol m−2 yr−1 from the Singapore Strait, suggesting that a large proportion of the remineralized peatland tDOC is ultimately emitted to the atmosphere. However, incubation experiments show that the remaining 30%–40% tDOC exhibits surprisingly low lability to microbial and photochemical degradation, suggesting that up to 20%–30% of peatland tDOC might be relatively refractory and exported to the open ocean. © 2021. The Authors.
英文关键词	acidification; remineralization; Sunda Shelf Sea; terrigenous organic carbon; tropical peatlands
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186290
作者单位	Asian School of the Environment, Nanyang Technological University, Singapore, Singapore; UK Centre for Ecology and Hydrology, Bangor, United Kingdom; Now at Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
推荐引用方式 GB/T 7714	Zhou Y.,Evans C.D.,Chen Y.,et al. Extensive Remineralization of Peatland-Derived Dissolved Organic Carbon and Ocean Acidification in the Sunda Shelf Sea, Southeast Asia[J],2021,126(6).
APA	Zhou Y.,Evans C.D.,Chen Y.,Chang K.Y.W.,&Martin P..(2021).Extensive Remineralization of Peatland-Derived Dissolved Organic Carbon and Ocean Acidification in the Sunda Shelf Sea, Southeast Asia.Journal of Geophysical Research: Oceans,126(6).
MLA	Zhou Y.,et al."Extensive Remineralization of Peatland-Derived Dissolved Organic Carbon and Ocean Acidification in the Sunda Shelf Sea, Southeast Asia".Journal of Geophysical Research: Oceans 126.6(2021).