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Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene

机译：全新世期间，在全新世期间，缺位与熔融控制生产率和海面条件的生产力和海面条件

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摘要

We address here the specific timing and amplitude of sea-surface conditions and productivity changes off SW Greenland, northern Labrador Sea, in response to the high deglacial meltwater rates, the Early Holocene maximum insolation and Neoglacial cooling. Dinocyst assemblages from sediment cores collected off Nuuk were used to set up quantitative records of sea ice cover, seasonal sea-surface temperature (SST), salinity (SSS), and primary productivity, with a centennial to millennial scale resolution. Until similar to 10 ka BP, ice-proximal conditions are suggested by the quasi-exclusive dominance of heterotrophic taxa and low dinocyst concentrations. At about 10 ka BP, an increase in species diversity and abundance of phototrophic taxa marks the onset of interglacial conditions at a regional scale, with summer SST reaching up to 10 degrees C between 8 and 5 ka BP, thus in phase with the Holocene Thermal Maximum as recorded in the southern Greenlandic areas/northern Labrador Sea. During this interval, low SSS but high productivity prevailed in response to high meltwater discharge and nutrient inputs from the Greenland Ice Sheet. After similar to 5 ka BP, a decrease in phototrophic taxa marks a two-step cooling of surface waters. The first started at similar to 5 ka BP, and the second at similar to 3 ka BP, with a shift toward colder conditions and higher SSS suggesting reduced meltwater discharge during the Neoglacial. This second step coincides with the disappearance of the Saqqaq culture. The gap in human occupation in west Greenland, between the Dorset and the Norse settlements from 2000 to 1000 years BP, might be linked to high amplitude and high frequency variability of ocean and climate conditions.
机译：我们在此处解决了海面条件的具体时间和幅度，以及北拉布拉多海域的SW格陵兰岛，响应高层熔融率，早期全新世的最大缺失和新镀层冷却。来自Nuuk收集的沉积物核心的DinoCyst组合用于建立海冰盖，季节性海面温度（SST），盐度（SSS）和初级生产率的定量记录，以百年达到千禧一代分辨率。直到类似于10kA BP，冰近型条件是由异养类出生株的准专用统治性和低大多细胞浓度的建议。在大约10ka的BP中，物种多样性和丰富的光营养分类群地增加了区域规模的爆裂条件的发病，夏季SST达到了8至5ka的高达10℃，因此与全新世热量相位最多可在格陵兰岛地区/北拉布拉多海域录制。在这种间隔期间，低SSS但高生产率响应于格陵兰冰板的高熔尿和营养投入而持续。在类似于5ka BP之后，光营养分类群的降低标志着表面水的两步冷却。第一次开始类似于5kA BP，第二个类似于3kA BP，其趋向于较冷的条件和更高的SSS，表明在新算术期间降低了熔融水排放。第二步与Saqqaq文化的消失一致。 2000年至1000年至1000年的Dorset与挪威住区之间的人类职业差距可能与海洋和气候条件的高幅度和高频变异有关。

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  • 来源
    《Boreas》 |2021年第3期|共21页
  • 作者

    Allan Estelle; de Vernal Anne; Seidenkrantz Marit-Solveig; Briner Jason P.; Hillaire-Marcel Claude; Pearce Christof; Meire Lorenz; Roy Hans; Mathiasen Anders Moller; Nielsen Mikkel Thy; Plesner Jane Lund; Perner Kerstin;

  • 作者单位

    Univ Quebec Montreal Ctr Rech Dynam Syst Terre Geotop CP 8888 Succursale Ctr Ville Montreal PQ H3C 3P8 Canada;

    Univ Quebec Montreal Ctr Rech Dynam Syst Terre Geotop CP 8888 Succursale Ctr Ville Montreal PQ H3C 3P8 Canada;

    Aarhus Univ Paleoceanog &

    Paleoclimate Grp Arctic Res Ctr Hoegh Guldbergs Gade 2 DK-8000 Aarhus Denmark;

    SUNY Buffalo Dept Geol 411 Cooke Hall Buffalo NY 14260 USA;

    Univ Quebec Montreal Ctr Rech Dynam Syst Terre Geotop CP 8888 Succursale Ctr Ville Montreal PQ H3C 3P8 Canada;

    Aarhus Univ Paleoceanog &

    Paleoclimate Grp Arctic Res Ctr Hoegh Guldbergs Gade 2 DK-8000 Aarhus Denmark;

    Univ Utrecht Royal Netherlands Inst Sea Res Dept Estuarine &

    Delta Syst Yerseke Netherlands;

    Aarhus Univ Dept Biol Arctic Res Ctr Aarhus Denmark;

    Aarhus Univ Paleoceanog &

    Paleoclimate Grp Arctic Res Ctr Hoegh Guldbergs Gade 2 DK-8000 Aarhus Denmark;

    Aarhus Univ Paleoceanog &

    Paleoclimate Grp Arctic Res Ctr Hoegh Guldbergs Gade 2 DK-8000 Aarhus Denmark;

    Aarhus Univ Paleoceanog &

    Paleoclimate Grp Arctic Res Ctr Hoegh Guldbergs Gade 2 DK-8000 Aarhus Denmark;

    Leibniz Inst Baltic Sea Res Dept Marine Geol Seestr 15 D-18119 Rostock Germany;

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  • 正文语种 eng
  • 中图分类 历史地质学、地层学;
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