气候变化领域集成服务门户(CCPortal): Evaluation of Abandoned Huanghe Delta as an Important Carbon Source for the Chinese Marginal Seas in Recent Decades

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DOI	10.1029/2020JC017125
	Evaluation of Abandoned Huanghe Delta as an Important Carbon Source for the Chinese Marginal Seas in Recent Decades
	Qi L.; Wu Y.; Chen S.; Wang X.
发表日期	2021
ISSN	21699275
卷号	126 期号:3
英文摘要	Increasing organic carbon (OC) inputs from coastal erosion contribute to large uncertainties in carbon cycling in coastal seas. The abandoned Huanghe Delta (AHD) is a typical coastal erosion region, which transports large amounts of eroded sediments to the Chinese marginal seas (CMS, not including the South China Sea). Here we investigated the organic geochemical characteristics of sedimentary organic matter (OM) from the heavily eroded region of the AHD and estimated the OC and lignin fluxes caused by coastal erosion. The eroded sedimentary OM was characterized by low carbon loading and low lignin content with high degradation and was influenced by the Changjiang. Owing to the sharp decline in the sediment fluxes from large rivers (the Changjiang and Huanghe) since the 1990s, the total fluxes to the CMS decreased from 11.5 to 5.0 Mt/yr for OC and from 11.5 × 10−2 to 4.7 × 10−2 Mt/yr for lignin; therefore, the contribution from the coastal erosion of the AHD increased from 24% ± 8% to 56% ± 10% for OC and from 21% ± 9% to 52% ± 15% for lignin. The high proportion contributed by the AHD to the Central Yellow Sea mud area (74% ± 11%) also accounted for the high terrestrial OC burial efficiency there (69%). Considering the different nature of OM and its increasing contribution, as in this case, the significance of OC input from coastal erosion to the coastal seas is expected to overwhelm that from rivers, thereby influencing regional and even global carbon budgets and cycles, especially under the scenarios of global warming and sea level rise. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	abandoned Huanghe Delta; Chinese marginal seas; coastal erosion; lignin; terrestrial OC
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/186439
作者单位	State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
推荐引用方式 GB/T 7714	Qi L.,Wu Y.,Chen S.,et al. Evaluation of Abandoned Huanghe Delta as an Important Carbon Source for the Chinese Marginal Seas in Recent Decades[J],2021,126(3).
APA	Qi L.,Wu Y.,Chen S.,&Wang X..(2021).Evaluation of Abandoned Huanghe Delta as an Important Carbon Source for the Chinese Marginal Seas in Recent Decades.Journal of Geophysical Research: Oceans,126(3).
MLA	Qi L.,et al."Evaluation of Abandoned Huanghe Delta as an Important Carbon Source for the Chinese Marginal Seas in Recent Decades".Journal of Geophysical Research: Oceans 126.3(2021).