气候变化领域集成服务门户(CCPortal): Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight; Irish margin)

CCPortal

DOI	10.1016/j.quascirev.2020.106310
	Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight; Irish margin)
	Wienberg C.; Titschack J.; Frank N.; De Pol-Holz R.; Fietzke J.; Eisele M.; Kremer A.; Hebbeln D.
发表日期	2020
ISSN	0277-3791
卷号	237
英文摘要	Turbulent bottom currents significantly influence the formation of cold-water coral mounds and sedimentation processes on continental slopes. Combining records from coral mounds and adjacent slope sediments therefore provide an unprecedented palaeo-archive to understand past variations of intermediate water-mass dynamics. Here, we present coral ages from coral mounds of the Belgica province (Porcupine Seabight, NE Atlantic), which indicate a non-synchronous Holocene re-activation in mound formation suggested by a temporal offset of ∼2.7 kyr between the deep (start: ∼11.3 ka BP at 950 m depth) and shallow (start: ∼8.6 ka BP at 700 m depth) mounds. A similar depth-dependent pattern is revealed in the slope sediments close to these mounds that become progressively younger from 22.1 ka BP at 990 m to 12.2 ka BP at 740 m depth (based on core-top ages). We suggest that the observed changes are the consequence of enhanced bottom-water hydrodynamics, caused by internal waves associated to the re-invigoration of the Mediterranean Outflow Water (MOW) and the development of a transition zone (TZ) between the MOW and the overlying Eastern North Atlantic Water (ENAW), which established during the last deglacial. These highly energetic conditions induced erosion adjacent to the Belgica mounds and supported the re-initiation of mound formation by increasing food and sediment fluxes. The striking depth-dependent patterns are likely linked to a shift of the ENAW-MOW-TZ, moving the level of maximum energy ∼250 m upslope since the onset of the last deglaciation. © 2020 The Author(s)
英文关键词	Belgica cold-water coral mound province; Coral mound formation; Holocene; Internal waves; Last deglacial; Mediterranean outflow water; NE Atlantic; Slope sedimentation; Vertical shift of intermediate water masses
语种	英语
scopus关键词	Erosion; Cold-water coral mounds; Continental slope; Intermediate waters; Last deglaciation; Mediterranean outflow waters; North Atlantic waters; Sedimentation process; Transition zones; Sediments; bottom water; cold water; coral; deglaciation; Holocene; hydrodynamics; intermediate water; last deglaciation; marine sediment; sedimentation; slope dynamics; transition zone; water erosion; Atlantic Ocean; Atlantic Ocean (North); Belgica Trough; Bellingshausen Sea; Porcupine Seabight; Southern Ocean; Anthozoa
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151482
作者单位	MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse 8, Bremen, 28359, Germany; Senckenberg am Meer (SaM), Marine Research Department, Südstrand 40, Wilhelmshaven, 26382, Germany; Institute of Environmental Physics (IUP), Heidelberg University, Im Neuenheimer Feld 229, Heidelberg, 69120, Germany; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Bat.12, Avenue de la TerrasseGif-sur-Yvette 91198, France; Centro de Investigación GAIA-Antártica (CIGA), Universidad de Magallanes, Av. Bulnes 01855, Punta Arenas, 6210427, Chile; GEOMAR - Helmholtz Center for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany
推荐引用方式 GB/T 7714	Wienberg C.,Titschack J.,Frank N.,et al. Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight; Irish margin)[J],2020,237.
APA	Wienberg C..,Titschack J..,Frank N..,De Pol-Holz R..,Fietzke J..,...&Hebbeln D..(2020).Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight; Irish margin).Quaternary Science Reviews,237.
MLA	Wienberg C.,et al."Deglacial upslope shift of NE Atlantic intermediate waters controlled slope erosion and cold-water coral mound formation (Porcupine Seabight; Irish margin)".Quaternary Science Reviews 237(2020).