气候变化领域集成服务门户(CCPortal): Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2

CCPortal

DOI	10.1038/s41561-019-0450-3
	Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2
	Si W.; Rosenthal Y.
发表日期	2019
ISSN	17520894
卷号	12 期号:10
英文摘要	The globally averaged calcite compensation depth has deepened by several hundred metres in the past 15 Myr. This deepening has previously been interpreted to reflect increased alkalinity supply to the ocean driven by enhanced continental weathering due to the Himalayan orogeny during the late Neogene period. Here we examine mass accumulation rates of the main marine calcifying groups and show that global accumulation of pelagic carbonates has decreased from the late Miocene epoch to the late Pleistocene epoch even though CaCO3 preservation has improved, suggesting a decrease in weathering alkalinity input to the ocean, thus opposing expectations from the Himalayan uplift hypothesis. Instead, changes in relative contributions of coccoliths and planktonic foraminifera to the pelagic carbonates in relative shallow sites, where dissolution has not taken its toll, suggest that coccolith production in the euphotic zone decreased concomitantly with the reduction in weathering alkalinity inputs as registered by the decline in pelagic carbonate accumulation. Our work highlights a mechanism whereby, in addition to deep-sea dissolution, changes in marine calcification acted to modulate carbonate compensation in response to reduced weathering linked to the late Neogene cooling and decline in atmospheric partial pressure of carbon dioxide. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	alkalinity; atmospheric pressure; calcification; calcite; calcium carbonate; carbon dioxide; coccolith; dissolution; euphotic zone; foraminifera; geoaccumulation; Himalayan orogeny; uplift; weathering; Foraminifera; Haptophyceae
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124596
作者单位	Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ, United States; Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, United States
推荐引用方式 GB/T 7714	Si W.,Rosenthal Y.. Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2[J],2019,12(10).
APA	Si W.,&Rosenthal Y..(2019).Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2.Nature Geoscience,12(10).
MLA	Si W.,et al."Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2".Nature Geoscience 12.10(2019).