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首页> 外文期刊>Paleoceanography >Water mass properties and exchange between the Nordic seas and the northern North Atlantic during the period 23-6 ka: Benthic oxygen isotopic evidence
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Water mass properties and exchange between the Nordic seas and the northern North Atlantic during the period 23-6 ka: Benthic oxygen isotopic evidence

机译：23-6 ka期间北欧海与北大西洋北部之间的水团性质和交换：海底氧同位素证据

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摘要

Twenty benthic oxygen isotope records from different water depths in the Nordic seas and the North Atlantic are compared. During the Last Glacial Maximum, brine formation on continental shelves produced Brine Shelf Water (BSW), sinking below 1500 m in the Nordic seas. Open- ocean convection in the Nordic seas produced Glacial North Atlantic Intermediate Water (GNAIW). GNAIW overflowed the Greenland-Scotland Ridge and entrained depths above and at least partly below 2000 m in the North Atlantic. During the early deglaciation, BSW-enriched intermediate water masses in the Nordic seas were formed. These overflowed the Greenland-Scotland Ridge and influenced the North Atlantic intermediate and deepwater masses. In the Bolling-Allerod ( BA), open-ocean convection increased and produced intermediate water in the Nordic seas, with outflow to the North Atlantic. However, deep water with modern characteristics did not entrain water below 2000 m in the North Atlantic in similar amounts as during the Holocene. A new period of brine formation during the Younger Dryas transported BSW to intermediate water masses in the Norwegian Sea. There was also open-ocean convection and meridional overturning in the Nordic seas, but it was probably reduced compared to the BA. In the early Holocene and mid-Holocene, meridional overturning appears similar to that of today. Potential locations for large-scale formation of BSW might have been broad and shallow (< 200 m) areas of the North Sea, northeast of Greenland, and north of east Siberia. These settings should be favorable for BSW formation during cold periods.
机译：比较了北欧海域和北大西洋中不同水深的20个底栖氧同位素记录。在最后一次冰川最大期，大陆架上的盐水形成了盐水架水（BSW），在北欧海中下沉了1500 m以下。北欧海中的公海对流产生了北大西洋中间水（GNAIW）。 GNAIW淹没了格陵兰-苏格兰山脊，并在北大西洋的2000 m以上和至少部分以下夹带了深度。在早期冰消期间，北欧海中形成了富含BSW的中间水团。这些溢出了格陵兰-苏格兰山脊，并影响了北大西洋的中层和深水区。在Bolling-Allerod（BA）中，远洋对流增加并在北欧海中产生中间水，并流向北大西洋。但是，北大西洋2000 m以下的具有现代特征的深水并没有夹带全新世时期的水。 Younger Dryas时期形成了一个新的盐水形成时期，将BSW运到挪威海中的中等水团。北欧海中还存在海洋对流和经向倾覆，但与BA相比可能减少了。在全新世早期和全新世中期，子午翻转似乎与今天类似。 BSW大规模形成的潜在位置可能是北海，格陵兰岛东北部和西伯利亚东部以北的宽而浅（<200 m）地区。这些设置应有利于寒冷时期形成BSW。

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