气候变化领域集成服务门户(CCPortal): Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean

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DOI	https://doi.org/10.1594/PANGAEA.897165
	Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean
	Vorrath; Maria-Elena; Müller; Juliane; Esper; Oliver; Mollenhauer; Gesine; Haas; Christian; Schefuß; Enno; Fahl; Kirsten
发布日期	2019-01-09
数据集类型	dataset
英文简介	Organic geochemical and micropaleontological analyses of surface sediments collected in the southern Drake Passage and the Bransfield Strait, Antarctic Peninsula, enable a proxy-based reconstruction of recent sea ice conditions in this climate sensitive area. The distribution of the sea ice biomarker IPSO25 supports earlier suggestions that the source diatoms seem to be common in near-coastal environments characterized by an annually recurring sea ice cover. We here propose and evaluate the combination of IPSO25 with a more unsaturated highly branched isoprenoid alkene and phytosterols and introduce the PIPSO25 index as a potentially semi-quantitative sea ice proxy. This organic geochemical approach is complemented with diatom data. PIPSO25 sea ice estimates are used to discriminate between areas characterized by permanently ice-free conditions, seasonal sea ice cover and extended sea ice cover. These trends are consistent with satellite sea ice data and winter sea ice concentrations estimated by diatom transfer functions. Minor offsets between proxy-based and satellite-based sea ice data are attributed to the different time intervals recorded within the sediments and the instrumental records from the study area, which experienced rapid environmental changes during the past 100 years.
空间范围	Median Latitude: -61.460042 * Median Longitude: -60.886850 * South-bound Latitude: -63.757000 * West-bound Longitude: -66.096170 * North-bound Latitude: -58.869000 * East-bound Longitude: -55.647000
时间范围	1987-11-14T01:21:00 - 2016-03-16T00:24:00
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/215190
推荐引用方式 GB/T 7714	Vorrath,Maria-Elena,Müller,et al. Highly branched isoprenoids, radiocarbon ages and diatom asmblages in surface sediments from Southern Ocean.2019-01-09.https://doi.org/10.1594/PANGAEA.897165.