Sea surface temperature across the Subarctic North Pacific and marginal seas through the past 20,000 years: A paleoceanographic synthesis
Sea surface temperature across the Subarctic North Pacific and marginal seas through the past 20,000 years: A paleoceanographic synthesis
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DOI：
10.1016/j.quascirev.2020.106519
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发表时间：
2020-10
影响因子：
4
通讯作者：
C. V. Davis;S. Myhre;C. Deutsch;B. Caissie;S. Praetorius;Marisa Borreggine;R. Thunell
中科院分区：
文献类型：
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作者：
C. V. Davis;S. Myhre;C. Deutsch;B. Caissie;S. Praetorius;Marisa Borreggine;R. Thunell
亚北极北太平洋和边缘海的冰消期海面状况是古海洋学日益感兴趣的主题。然而，缺乏一个有凝聚力的近地表海洋学的图片，通过最后一次冰消期比较区域间和区域内的变化。本文利用有孔虫方解石（δ 18 O和Mg/Ca）和颗石珊瑚烯酮（Uk'37）的代用记录，对北太平洋及其边缘海近20 ka的海表温度进行了综合分析。尽管在末次冰盛期和冰消期早期，Uk'37记录通常被解释为比邻近的δ 18 O或Mg/Ca记录更温暖，但在全新世，海表温度代用指标往往是一致的。鄂霍次克海全新世δ 18 O与Uk'37的差异可能是近表层分层变化的结果。我们发现，在北太平洋和白令海的大部分地区，海面变暖发生在Bølling-Allerød（14.7 ka）的开始之前，并与全新世（11.7 ka）的开始一致。代理记录也显示了与新仙女木（12.9-11.7 ka）大致同步的冷逆转。全新世开始后，在西太平洋高纬度地区，一个加强的温暖的黑潮流的影响是显而易见的，和一个东西的海面温度的跷跷板，可能是由北太平洋环流的强度变化驱动，特征是开放的间冰期北太平洋。
Deglacial sea surface conditions in the subarctic North Pacific and marginal seas are the subject of increasing interest in paleoceanography. However, a cohesive picture of near-surface oceanography from which to compare inter and intra-regional variability through the last deglaciation is lacking. We present a synthesis of sea surface temperature covering the open North Pacific and its marginal seas, spanning the past 20 ka using proxy records from foraminiferal calcite (δ18O and Mg/Ca) and coccolithophore alkenones (Uk’37). Sea surface temperature proxies tend to be in agreement through the Holocene, though Uk’37records are often interpreted as warmer than adjacent δ18O or Mg/Ca records during the Last Glacial Maximum and early deglaciation. In the Sea of Okhotsk, Holocene discrepancies between δ18O and Uk’37may be the result of changes in near-surface stratification. We find that sea-surface warming occurred prior to the onset of the Bølling-Allerød (14.7 ka) and coincident with the onset of the Holocene (11.7 ka) in much of the North Pacific and Bering Sea. Proxy records also show a cold reversal roughly synchronous with the Younger Dryas (12.9–11.7 ka). After the onset of the Holocene, the influence of an intensified warm Kuroshio Current is evident at higher latitudes in the Western Pacific, and an east-west seesaw in sea surface temperature, likely driven by changes in the strength of the North Pacific Gyre, characterizes the open interglacial North Pacific.