5 Upwelling in eastern boundary current regions is crucial to bringing nutrient-rich water to the 6 photic zone and supporting the associated ecosystems. This upwelling is a result of the wind7 driven ocean circulation and is therefore susceptible to changes in the atmospheric circulation. 8 We use the Community Earth System Model and observational data to explore the response of 9 upwelling in the California and Canary current systems to shifts in the Northern Hemisphere 10 subtropical high-pressure systems. We find that shifts in the North Pacific subtropical high 11 explain a substantial fraction of both the short-term variability and projected trend in upwelling 12 in the California Current system during boreal summer. By contrast, the Canary Current system 13 is less affected by shifts of the North Atlantic subtropical high, mostly because the strongest 14 wind anomalies associated with shifts of this high-pressure system occur too far north. 15

中文翻译：

---

移动副热带高压对加利福尼亚和加那利洋流系统的影响

5 东部边界流区的上升流对于将富含营养的水带到 6 透光区和支持相关的生态系统至关重要。这种上升流是风 7 驱动的海洋环流的结果，因此容易受到大气环流变化的影响。8 我们使用社区地球系统模型和观测数据来探索加利福尼亚和加那利洋流系统的 9 上升流对北半球 10 副热带高压系统变化的响应。我们发现北太平洋副热带高压 11 的变化解释了北太平洋夏季加利福尼亚洋流系统中上升流 12 的短期变化和预测趋势的很大一部分。相比之下，金丝雀洋流系统 13 受北大西洋副热带高压变化的影响较小，主要是因为与这个高压系统的移动相关的最强的 14 个风异常发生在太北的地方。15