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Orbital suppression of wind-driven upwelling in the California Current at 6 ka

机译：6 ka时加利福尼亚流中风动力上升流的轨道抑制

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摘要

Marine records clearly show activity in the California Current (CC) system to have been altered during the mid-Holocene. However, the specific nature of CC activity during this period remains ambiguous, as proxies that suggest cooler than present sea surface temperatures co-occur in mid-Holocene marine sediments with multiple proxies that suggest decreased coastal upwelling. To test the sensitivity of wind-driven upwelling in the CC to mid-Holocene orbital forcing, we have employed a high-resolution regional climate model (RCM). The seasonality of modern CC wind-driven coastal upwelling simulated by the RCM is in strong agreement with observational data. Further, we show that changes in the seasonality of solar insolation induced by mid-Holocene Milankovitch forcing decrease early and peak season coastal upwelling in the CC, along with increasing late season coastal upwelling. These results are in agreement with several marine and terrestrial proxies, suggesting that, relative to present, CC activity during the mid-Holocene was characterized by a longer and less vigorous upwelling season with decreased seasonal contrast.
机译：海洋记录清楚地表明，在全新世中期，加利福尼亚洋流（CC）系统中的活动已发生改变。然而，在这一时期，CC活动的具体性质仍然是模棱两可的，因为代表在全新世中期海洋沉积物中同时出现比当前海表温度低的代理，同时也代表着沿海上升下降的多个代理。为了测试CC中的风动力上升流对全新世中轨道强迫的敏感性，我们采用了高分辨率的区域气候模型（RCM）。 RCM模拟的现代CC风力驱动的海岸上升流的季节性与观测数据高度吻合。进一步，我们表明，由全新世中期米兰科维奇强迫强迫引起的日照季节变化减少了CC的早期和高峰季节海岸上升流，同时也增加了后期海岸上升流。这些结果与几种海洋和陆地代理一致，表明相对于目前，全新世中期的CC活动的特征是上升季节较长且不那么活跃，且季节对比降低。

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