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Response of biological productivity to North Atlantic marine front migration during the Holocene
Climate of the Past ( IF 4.3 ) Pub Date : 2021-02-08 , DOI: 10.5194/cp-17-379-2021
David J. Harning , Anne E. Jennings , Denizcan Köseoğlu , Simon T. Belt , Áslaug Geirsdóttir , Julio Sepúlveda

Marine fronts delineate the boundary between distinct water masses and, through the advection of nutrients, are important facilitators of regional productivity and biodiversity. As the modern climate continues to change, the migration of frontal zones is evident, but a lack of information about their status prior to instrumental records hinders future projections. Here, we combine data from lipid biomarkers (archaeal isoprenoid glycerol dibiphytanyl glycerol tetraethers and algal highly branched isoprenoids) with planktic and benthic foraminifera assemblages to detail the biological response of the marine Arctic and polar front migrations on the North Iceland Shelf (NIS) over the last 8 kyr. This multi-proxy approach enables us to quantify the thermal structure relating to Arctic and polar front migration and test how this influences the corresponding changes in local pelagic productivity. Our data show that following an interval of Atlantic water influence, the Arctic front and its associated high pelagic productivity migrated southeastward to the NIS by ∼6.1ka. Following a subsequent trend in regional cooling, Polar Water from the East Greenland Current and the associated polar front spread onto the NIS by ∼3.8ka, greatly diminishing local algal productivity through the Little Ice Age. Within the last century, the Arctic and polar fronts have moved northward back to their current positions relative to the NIS and helped stimulate the productivity that partially supports Iceland's economy. Our Holocene records from the NIS provide analogues for how the current frontal configuration and the productivity that it supports may change as global temperatures continue to rise.

中文翻译:

全新世期间生物生产力对北大西洋海洋前沿迁移的响应

海洋前沿划定了不同水域之间的边界,通过养分的平流,它们是区域生产力和生物多样性的重要促进者。随着现代气候的不断变化,额叶地带的迁移是显而易见的,但是在仪器记录之前缺少有关其状况的信息会阻碍未来的预测。在这里,我们将脂类生物标记物(古生物类异戊二烯甘油双双植物油基甘油四醚和藻类高度分支的类异戊二烯)与浮游有孔虫和有孔虫的组合相结合,以详细说明北冰架上的北极和北极极地海面迁徙的生物学响应。去年8  KYR。这种多代理方法使我们能够量化与北极和极地锋面迁徙有关的热结构,并测试这如何影响当地中上层生产力的相应变化。我们的数据表明,随着大西洋水影响的间隔,北极锋及其相关的高中上层生产力向东南移动到NIS约6.1 ka。随着区域降温的后续趋势,东格陵兰洋流的极地水和相关的极地锋约3.8 ka扩散到NIS上,大大降低了小冰河时代的当地藻类生产力。在上个世纪之内,北极和极地前线已经向北移动回到相对于NIS的当前位置,并帮助刺激了部分支持冰岛经济的生产力。我们的NIS全新世记录提供了类似的信息,说明了随着全球温度继续升高,当前的正面配置及其所支持的生产力可能会如何变化。
更新日期:2021-02-09
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