气候变化领域集成服务门户(CCPortal): Decoupled carbonate chemistry controls on the incorporation of boron into Orbulina universa

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.868943
	Decoupled carbonate chemistry controls on the incorporation of boron into Orbulina universa
	Howes; Ella L; Kaczmarek; Karina; Raitzsch; Markus; Mewes; A; Bijma; N; Horn; I; Misra; Sambuddha; Gattuso; Jean-Pierre; Bijma; Jelle
发布日期	2016-12-01
数据集类型	dataset
英文关键词	Bottles or small containers/Aquaria ( 20 L) ; Chromista ; Coast and continental shelf ; Forams ; Heterotrophic prokaryotes ; Laboratory experiment ; Other studied parameter or process ; Pelagos ; Single species ; Temperate
英文简介	In order to fully constrain paleo-carbonate systems, proxies for two out of seven parameters, plus temperature and salinity are required. The boron isotopic composition (delta 11B) of planktonic foraminifera shells is a powerful tool to reconstruct changes in past surface ocean pH. As [B(OH)]4- is substituted into the biogenic calcite lattice in place of [CO3]2-, it has been suggested that B/Ca ratios in biogenic calcite are a possible proxy for [CO3]2-. However, differentiating between the effects of pH and [CO3]2- is problematic, as they co-vary closely in natural systems, and so the major control on boron incorporation remains unclear. To deconvolve the effects of pH and [CO3]2- on the B/Ca ratio and to test whether d11B remains constant at constant pH, but under changing [CO3]2- (pH 8.05 with 238, 285 and 532 µmol/kg [CO3]2-) and vice versa, we decoupled pH and [CO3]2- (276 +/- 19.5 µmol/kg [CO3]2- with pH 7.7, 7.9 and 8.05) and grew the planktonic foraminifer Orbulina universa in these manipulated culture media. Measurements of the isotope composition of boron and the B/Ca ratio were performed simultaneously using a femtosecond laser ablation system coupled to an MC ICP-MS. Results show that delta11B is controlled by pH and does not respond to changes in [CO3]2-. On the other hand, the B/Ca ratio is driven by [HCO3]- independently of pH. This suggests that B/Ca ratios in foraminiferal calcite may be used as a second, independent, proxy for paleo-carbonate system reconstructions.
空间范围	Latitude: 43.400000 * Longitude: 7.180000
时间范围	2012-03-14T07:30:00 - 2012-03-27T12:32:00
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/216705
推荐引用方式 GB/T 7714	Howes,Ella L,Kaczmarek,et al. Decoupled carbonate chemistry controls on the incorporation of boron into Orbulina universa.2016-12-01.https://doi.org/10.1594/PANGAEA.868943.