globalchange  > 气候减缓与适应
DOI: 10.1111/bor.12358
WOS记录号: WOS:000454203700015
论文题名:
Ice-rafting patterns on the western Svalbard slope 74-0 ka: interplay between ice-sheet activity, climate and ocean circulation
作者: Jessen, Simon P.1; Rasmussen, Tine L.2
通讯作者: Jessen, Simon P.
刊名: BOREAS
ISSN: 0300-9483
EISSN: 1502-3885
出版年: 2019
卷: 48, 期:1, 页码:236-256
语种: 英语
WOS关键词: LAST GLACIAL MAXIMUM ; TROUGH-MOUTH FANS ; ATLANTIC WATER ADVECTION ; NORWEGIAN-GREENLAND SEA ; BARENTS SEA ; NORTH-ATLANTIC ; NORDIC SEAS ; ARCTIC-OCEAN ; PALEOCEANOGRAPHIC EVOLUTION ; LAMINATED SEDIMENTS
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向: Physical Geography ; Geology
英文摘要:

The distribution of ice-rafted detritus (IRD) is studied in three cores from the western Svalbard slope (1130-1880 m water depth, 76-78 degrees N) covering the period 74-0 ka. The aim was to provide new insight into the dynamics of the Svalbard-Barents Sea Ice Sheet during Marine Isotope Stages (MIS) 4-1 to get a better understanding of ice-sheet interactions with changes in ocean circulation and climate on orbital and millennial (Dansgaard-Oeschger events of stadial-interstadial) time scales. The results show that concentration, flux, composition and grain-size of IRD vary with climate and ocean temperature on both orbital and millennial time scales. The IRD consists mainly of fragments of siltstones and mono-crystalline transparent quartz (referred to as 'quartz'). IRD dominated by siltstones has a local Svalbard-Barents Sea source, while IRD dominated by quartz is from distant sources. Local siltstone-rich IRD predominates in warmer climatic phases (interstadials), while the proportion of allochthonous quartz-rich IRD increases in cold phases (glacials and stadials/Heinrich events). During the Last Glacial Maximum and early deglaciation at 24-16.1 ka, the quartz content reached up to >90%. In warm climate, local iceberg calving apparently increased and the warmer ocean surface caused faster melting. During the glacial maxima (MIS 4 and MIS 2) and during cold stadials and Heinrich events, the local ice-sheets must have been relatively stable with low ablation. During ice retreat phases of the MIS 4/3 and MIS 2/1 transitions, maxima in IRD deposition were dominated by local coarse-grained IRD. These maxima correlate with episodes of climate warming, indicating a rapid, stepwise retreat of the Svalbard-Barents Sea Ice Sheet in phase with millennial-scale climate oscillations.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/126118
Appears in Collections:气候减缓与适应

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作者单位: 1.Cent Adm North Cape Municipal, Radhusgata 12,POB 403, N-9751 Honningsvag, Norway
2.UiT, Dept Geosci, CAGE Ctr Arctic Gas Hydrate Environm & Climate, Dramsveien 201, N-9037 Tromso, Norway

Recommended Citation:
Jessen, Simon P.,Rasmussen, Tine L.. Ice-rafting patterns on the western Svalbard slope 74-0 ka: interplay between ice-sheet activity, climate and ocean circulation[J]. BOREAS,2019-01-01,48(1):236-256
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