气候变化领域集成服务门户(CCPortal): Delta 13C measured on alkenones of surface sediment samples GeoB1008-6 to GeoB3603-1 from the South Atlantic

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.63632
	Delta 13C measured on alkenones of surface sediment samples GeoB1008-6 to GeoB3603-1 from the South Atlantic
	Benthien; Albert; Andersen; Nils; Schulte; Sonja; Müller; Peter J; Schneider; Ralph R; Wefer; Gerold
发布日期	2002-03-25
数据集类型	dataset
英文简介	We have analyzed the stable carbon isotopic composition of the diunsaturated C37 alkenone in 29 surface sediments from the equatorial and South Atlantic Ocean. Our study area covers different oceanographic settings, including sediments from the major upwelling regions off South Africa, the equatorial upwelling, and the oligotrophic western South Atlantic. In order to examine the environmental influences on the sedimentary record the alkenone-based carbon isotopic fractionation (Ep) values were correlated with the overlying surface water concentrations of aqueous CO2 ([CO2(aq)]), phosphate, and nitrate. We found Ep positively correlated with 1/[CO2(aq)] and negatively correlated with [PO43-] and [NO3-]. However, the relationship between Ep and 1/[CO2(aq)] is opposite of what is expected from a [CO2(aq)] controlled, diffusive uptake model. Instead, our findings support the theory of Bidigare et al. (1997, doi:10.1029/96GB03939) that the isotopic fractionation in haptophytes is related to nutrient-limited growth rates. The relatively high variability of the Ep-[PO4] relationship in regions with low surface water nutrient concentrations indicates that here other environmental factors also affect the isotopic signal. These factors might be variations in other growth-limiting resources such as light intensity or micronutrient concentrations.
空间范围	Median Latitude: -13.404206 * Median Longitude: -10.443734 * South-bound Latitude: -35.121667 * West-bound Longitude: -45.870000 * North-bound Latitude: 5.333333 * East-bound Longitude: 17.533333
时间范围	1988-02-21T00:00:00 - 1996-01-04T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/232973
推荐引用方式 GB/T 7714	Benthien,Albert,Andersen,et al. Delta 13C measured on alkenones of surface sediment samples GeoB1008-6 to GeoB3603-1 from the South Atlantic.2002-03-25.https://doi.org/10.1594/PANGAEA.63632.