气候变化领域集成服务门户(CCPortal): Geochemical and palynological measurements from the ODP Leg 189 at Site 1172 on the East Tasman Plateau

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.756399
	Geochemical and palynological measurements from the ODP Leg 189 at Site 1172 on the East Tasman Plateau
	Sluijs; Appy; Bijl; Peter K; Schouten; Stefan; Röhl; Ursula; Reichart; Gert-Jan; Brinkhuis; Henk
发布日期	2011-01-27
数据集类型	dataset
英文简介	A brief (~150 kyr) period of widespread global average surface warming marks the transition between the Paleocene and Eocene epochs, ~56 million years ago. This so-called "Paleocene-Eocene thermal maximum" (PETM) is associated with the massive injection of 13C-depleted carbon, reflected in a negative carbon isotope excursion (CIE). Biotic responses include a global abundance peak (acme) of the subtropical dinoflagellate Apectodinium. Here we identify the PETM in a marine sedimentary sequence deposited on the East Tasman Plateau at Ocean Drilling Program (ODP) Site 1172 and show, based on the organic paleothermometer TEX86, that southwest Pacific sea surface temperatures increased from ~26 °C to ~33°C during the PETM. Such temperatures before, during and after the PETM are >10 °C warmer than predicted by paleoclimate model simulations for this latitude. In part, this discrepancy may be explained by potential seasonal biases in the TEX86 proxy in polar oceans. Additionally, the data suggest that not only Arctic, but also Antarctic temperatures may be underestimated in simulations of ancient greenhouse climates by current generation fully coupled climate models. An early influx of abundant Apectodinium confirms that environmental change preceded the CIE on a global scale. Organic dinoflagellate cyst assemblages suggest a local decrease in the amount of river run off reaching the core site during the PETM, possibly in concert with eustatic rise. Moreover, the assemblages suggest changes in seasonality of the regional hydrological system and storm activity. Finally, significant variation in dinoflagellate cyst assemblages during the PETM indicates that southwest Pacific climates varied significantly over time scales of 103 - 104 years during this event, a finding comparable to similar studies of PETM successions from the New Jersey Shelf.
空间范围	Latitude: -43.959230 * Longitude: 149.928610
时间范围	2000-04-28T11:30:00 - 2000-05-03T21:00:00
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/226933
推荐引用方式 GB/T 7714	Sluijs,Appy,Bijl,et al. Geochemical and palynological measurements from the ODP Leg 189 at Site 1172 on the East Tasman Plateau.2011-01-27.https://doi.org/10.1594/PANGAEA.756399.