气候变化领域集成服务门户(CCPortal): Water mass evolution of the Greenland Sea since late glacial times

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.832368
	Water mass evolution of the Greenland Sea since late glacial times
	Telesiński; Maciej Mateusz; Spielhagen; Robert F; Bauch; Henning A
发布日期	2014-05-07
数据集类型	dataset
英文简介	Four sediment cores from the central and northern Greenland Sea basin, a crucial area for the renewal of North Atlantic deep water, were analyzed for planktic foraminiferal fauna, planktic and benthic stable oxygen and carbon iso- topes as well as ice-rafted debris to reconstruct the environ- mental variability in the last 23 kyr. During the Last Glacial Maximum, the Greenland Sea was dominated by cold and sea-ice bearing surface water masses. Meltwater discharges from the surrounding ice sheets affected the area during the deglaciation, influencing the water mass circulation. During the Younger Dryas interval the last major freshwater event occurred in the region. The onset of the Holocene interglacial was marked by an increase in the advection of Atlantic Wa- ter and a rise in sea surface temperatures (SST). Although the thermal maximum was not reached simultaneously across the basin, benthic isotope data indicate that the rate of overturn- ing circulation reached a maximum in the central Greenland Sea around 7ka. After 6-5ka a SST cooling and increas- ing sea-ice cover is noted. Conditions during this so-called "Neoglacial" cooling, however, changed after 3 ka, probably due to enhanced sea-ice expansion, which limited the deep convection. As a result, a well stratified upper water column amplified the warming of the subsurface waters in the central Greenland Sea, which were fed by increased inflow of At- lantic Water from the eastern Nordic Seas. Our data reveal that the Holocene oceanographic conditions in the Green- land Sea did not develop uniformly. These variations were a response to a complex interplay between the Atlantic and Polar water masses, the rate of sea-ice formation and melting and its effect on vertical convection intensity during times of Northern Hemisphere insolation changes.
空间范围	Median Latitude: 75.148922 * Median Longitude: -4.997989 * South-bound Latitude: 73.249700 * West-bound Longitude: -8.998300 * North-bound Latitude: 76.846300 * East-bound Longitude: 1.339700
时间范围	1990-06-22T00:00:00 - 1990-07-04T00:00:00
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/233547
推荐引用方式 GB/T 7714	Telesiński,Maciej Mateusz,Spielhagen,et al. Water mass evolution of the Greenland Sea since late glacial times.2014-05-07.https://doi.org/10.1594/PANGAEA.832368.