气候变化领域集成服务门户(CCPortal): Alkenone carbon isotopes, unsatutation measurements, coccolith size and stable planktic foraminifera carbon isotopes for estimation of atmospheric CO2 at ODP Site 999

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.899353
	Alkenone carbon isotopes, unsatutation measurements, coccolith size and stable planktic foraminifera carbon isotopes for estimation of atmospheric CO2 at ODP Site 999
	Badger; Marcus P S; Chalk; Thomas B; Foster; Gavin L; Bown; Paul R; Gibbs; Samantha J; Sexton; Philip F; Schmidt; Daniela N; Pälike; Heiko; Mackensen; Andreas; Pancost; Richard D
发布日期	2019-03-15
数据集类型	dataset
英文简介	Atmospheric _p_CO~2~ is a critical component of the global carbon system and is considered to be the major control of Earth's past, present and future climate. Accurate and precise reconstructions of its concentration through geological time are, therefore, crucial to our understanding of the Earth system. Ice core records document _p_CO~2~ for the past 800 kyrs, but at no point during this interval were CO~2~ levels higher than today. Interpretation of older _p_CO~2~ has been hampered by discrepancies during some time intervals between two of the main ocean-based proxy methods used to reconstruct _p_CO~2~: the carbon isotope fractionation that occurs during photosynthesis as recorded by haptophyte biomarkers (alkenones) and the boron isotope composition (δ^11^B) of foraminifer shells. Here we present alkenone and δ^11^B-based _p_CO~2~ reconstructions generated from the same samples from the Plio-Pleistocene at ODP Site 999 across a glacial-interglacial cycle. We find a muted response to _p_CO~2~ in the alkenone record compared to contemporaneous ice core and δ^11^B records, suggesting caution in the interpretation of alkenone-based records at low _p_CO~2~ levels. This is possibly caused by the physiology of CO~2~ uptake in the haptophytes. Our new understanding resolves some of the inconsistencies between the proxies and highlights that caution may be required when interpreting alkenone-based reconstructions of _p_CO~2~.
空间范围	Latitude: 12.744000 * Longitude: -78.739300
时间范围	1996-01-10T19:30:00 - 1996-01-14T23:15:00
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/215169
推荐引用方式 GB/T 7714	Badger,Marcus P S,Chalk,et al. Alkenone carbon isotopes, unsatutation measurements, coccolith size and stable planktic foraminifera carbon isotopes for estimation of atmospheric CO2 at ODP Site 999.2019-03-15.https://doi.org/10.1594/PANGAEA.899353.