南极洲罗斯海波林亚1150年的ice core记录
1150 year long ice core record of the Ross Sea Polynya, Antarctica
摘要：
了解南极冰间湖（如罗斯海和威德尔海）过去的行为有助于了解生物生产力、海冰产生、下降风和南半球西风（SHW）风强度、南极底层水（ABW）的形成和海洋CO2封存。先前的研究将钡（Ba）海洋沉积作用与冰泥沉积物初级生产力联系起来（Bonn等人，1998; McManus等人，2002; Pirrung等人，2008年），冰间湖面积下降风强度和近端气旋（Bromwich等人，1998; Drucker等人，2011年），并强调罗斯冰架产犊事件对罗斯海Polynya（RSP）的影响（Rhodes等人，2009年）。在这里，我们使用RICE冰芯，距离罗斯冰架前沿仅120公里，以捕获1150年的RSP行为。我们链接大气Ba波动Ba海洋沉积作用在夏季罗斯海Polynya，创建第一个深冰芯为基础的RSP代理。RSP面积目前是我们1150年记录中观测到的最小的，并且在整个小冰期随着与罗斯海气旋相关的阿蒙森海低压（ASL）强度的波动而变化。过去的RSP重建使我们能够预测RSP区域对未来气候变化的未来响应，考虑到最近威德尔海Polynya响应于人为强迫而消失，这是特别感兴趣的（de Lavergne等人，2014年）。
英文摘要：
Knowledge of the past behavior of Antarctic polynyas such as the Ross and Weddell Seas contributes to the understanding of biological productivity, sea ice production, katabatic and Southern Hemisphere Westerly (SHW) wind strength, Antarctic bottom water (ABW) formation, and marine CO2 sequestration. Previous studies link barium (Ba) marine sedimentation to polynya primary productivity (Bonn et al., 1998; McManus et al., 2002; Pirrung et al., 2008), polynya area to katabatic wind strength and proximal cyclones (Bromwich et al., 1998; Drucker et al., 2011), and highlight the influence of Ross Ice Shelf calving event effects on the Ross Sea Polynya (RSP) (Rhodes et al., 2009). Here we use the RICE ice core, located just 120 km from the Ross Ice Shelf front to capture 1150 years of RSP behavior. We link atmospheric Ba fluctuations to Ba marine sedimentation in the summer Ross Sea Polynya, creating the first deep ice core based RSP proxy. RSP area is currently the smallest ever observed over our 1150-year record, and varied throughout the Little Ice Age with fluctuations in Amundsen Sea Low (ASL) strength related with Ross Sea cyclones. Past RSP reconstructions allow us to predict future responses of RSP area to future climate change, which is of special interest considering the recent disappearance of the Weddell Sea Polynya in response to anthropogenic forcing (de Lavergne et al., 2014).
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