Surface albedo over the ice‐covered polar ocean is decreased in a highly idealized numerical experiment, which leads to stronger (weaker) warming at high (low) latitudes, and forms Arctic amplification. With stronger warming at both high and low latitudes, the meridional temperature gradient decreases (increases) at midlatitudes (subtropical regions). A cyclonic wind anomaly appears and results in a weak Kuroshio current and warm interdecadal Pacific Oscillation phase. In response to Arctic‐amplified‐warming, the subtropical high weakens, leading to summer monsoon anomaly on its southside and increased westward transport of water vapor, resulting in a seesaw pattern: dry (wet) conditions in summer in North China (southwest United States, SWUS). In winter, the East Asian trough (North American high) decreases and induces decreased (increased) cold air transport to North China (SWUS) in response to Arctic‐amplified‐warming, which makes rain unlikely (likely) and exhibits a seesaw pattern. Moisture convergence always appears in a warmer SWUS winter, and increases precipitation there, which strengthens (counteracts) the precipitation anomaly led by the North American high in a warm (cold) interdecadal Pacific Oscillation phase. It may even shut down the seesaw pattern in winter in the cold interdecadal Pacific Oscillation phase.

中文翻译：

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华北与美国西南部季节性降水变化的跷跷板：对北极放大作用的回应

在高度理想化的数值实验中，被冰覆盖的极地海洋的地表反照率降低，这导致在高（低）纬度上变暖（变弱），并形成北极放大作用。随着高纬和低纬地区变暖的加剧，中纬度（亚热带地区）的子午温度梯度降低（增加）。出现气旋风异常，导致黑潮流弱，年代际太平洋振荡活跃。为了应对北极的变暖，副热带高压减弱，导致夏季夏季风异常在南侧，水蒸气向西输送增加，导致形成跷跷板模式：华北地区夏季处于干燥（潮湿）条件（西南美国） ，SWUS）。在冬季，东亚低谷（北美最高）减少并导致向北极（SWUS）的冷空气输送减少（增加），这是由于北极气候变暖引起的，这使得降雨不太可能（可能）并且呈现出跷跷板式的趋势。水分汇聚总是在SWUS温暖的冬季出现，并增加那里的降水量，从而加强（抵消）在温暖的（冷）年代际太平洋涛动期，由北美高压导致的降水异常。在冬季年代际太平洋振荡低的时期，它甚至可能会关闭跷跷板模式。在一个年代际（冷）年代际太平洋涛动阶段，这加剧（抵消）了由北美高空引起的降水异常。在冬季年代际太平洋振荡低的时期，它甚至可能会关闭跷跷板模式。在一个年代际（冷）年代际太平洋涛动阶段，这加剧（抵消）了由北美高空引起的降水异常。在冬季年代际太平洋振荡低的时期，它甚至可能会关闭跷跷板模式。