Export production fluctuations in the eastern equatorial Pacific during   the Pliocene-Pleistocene: Reconstruction using barite accumulation rates

doi:10.1002/2015PA002860

CORC > 北京大学 > 地球与空间科学学院

	Export production fluctuations in the eastern equatorial Pacific during the Pliocene-Pleistocene: Reconstruction using barite accumulation rates
	Ma, Zhongwu ; Ravelo, Ana Christina ; Liu, Zhonghui ; Zhou, Liping ; Paytan, Adina
刊名	PALEOCEANOGRAPHY
	2015
关键词	MIDPLEISTOCENE CLIMATE TRANSITION PERMANENT EL-NINO TROPICAL PACIFIC BIOLOGICAL PRODUCTION ATMOSPHERIC CO2 SOUTHERN-OCEAN GLACIAL CYCLES MARINE BARITE SURFACE OCEAN WARM PERIOD
DOI	10.1002/2015PA002860
英文摘要	Export production is an important component of the carbon cycle, modulating the climate system by transferring CO2 from the atmosphere to the deep ocean via the biological pump. Here we use barite accumulation rates to reconstruct export production in the eastern equatorial Pacific over the past 4.3 Ma. We find that export production fluctuated considerably on multiple time scales. Export production was on average higher (51 g Cm-2 yr(-1)) during the Pliocene than the Pleistocene (40 g Cm-2 yr(-1)), decreasing between 3 and 1 Ma (from more than 60 to 20 g Cm-2 yr(-1)) followed by an increase over the last million years. These trends likely reflect basin-scale changes in nutrient inventory and ocean circulation. Our record reveals decoupling between export production and temperatures on these long (million years) time scale. On orbital time scales, export production was generally higher during cold periods (glacial maxima) between 4.3 and 1.1 Ma. This could be due to stronger wind stress and higher upwelling rates during glacial periods. A shift in the timing of maximum export production to deglaciations is seen in the last similar to 1.1 million years. Results from this study suggest that, in the eastern equatorial Pacific, mechanisms that affect nutrient supply and/or ecosystem structure and in turn carbon export on orbital time scales differ from those operating on longer time scales and that processes linking export production and climate-modulated oceanic conditions changed about 1.1 million years ago. These observations should be accounted for in climate models to ensure better predictions of future climate change.; NSFC [41406053]; Ministry of Education, China [B14001]; NSF CAREER [OCE-0449732]; SCI(E); ARTICLE; apaytan@ucsc.edu; 11; 1455-1469; 30
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/439271]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Ma, Zhongwu,Ravelo, Ana Christina,Liu, Zhonghui,et al. Export production fluctuations in the eastern equatorial Pacific during the Pliocene-Pleistocene: Reconstruction using barite accumulation rates[J]. PALEOCEANOGRAPHY,2015.
APA	Ma, Zhongwu,Ravelo, Ana Christina,Liu, Zhonghui,Zhou, Liping,&Paytan, Adina.(2015).Export production fluctuations in the eastern equatorial Pacific during the Pliocene-Pleistocene: Reconstruction using barite accumulation rates.PALEOCEANOGRAPHY.
MLA	Ma, Zhongwu,et al."Export production fluctuations in the eastern equatorial Pacific during the Pliocene-Pleistocene: Reconstruction using barite accumulation rates".PALEOCEANOGRAPHY (2015).