Atlantic impacts on subdecadal warming over the tropical Pacific in the 2000s
Atlantic impacts on subdecadal warming over the tropical Pacific in the 2000s
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DOI：
10.3389/fclim.2022.1040352
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
T. Mochizuki;Masahiro Watanabe
中科院分区：
文献类型：
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作者：
T. Mochizuki;Masahiro Watanabe
在本世纪头十年，热带太平洋上的一种次年代际(即三年移动平均)变化非常明显。结果与方法通过对全球气候模式的部分同化，我们证明了热带大西洋的海面温度异常对本世纪初热带太平洋高海温异常的形成有贡献。赤道大西洋上的低海温改变了Walker环流，与之相关的太平洋信风的减弱使赤道海温在亚年代际尺度上升高。同时，由于高空伴随的反气旋性地面风异常，由于上层海洋温跃层加深，赤道外北太平洋也产生了高海温异常。虽然副热带北大西洋海温可能有助于赤道太平洋亚年代际变暖，但由此产生的海温异常表现出相变延迟一年，并适度伴随着海洋温跃层的加深。讨论它大致遵循Imrad格式。
Introduction A subdecadal (i.e. , three-year running mean) variation over the tropical Pacific is very distinctively observed in the 2000s. Results and methods Here, we have demonstrated that sea surface temperature (SST) anomalies in the tropical Atlantic contribute to forming high ocean-temperature anomalies in the tropical Pacific in the early 2000s by performing partial data assimilation of a global climate model. Low SSTs over the equatorial Atlantic change the Walker circulation, and the associated weakening of the Pacific trade winds raises the equatorial SST on subdecadal timescales. At the same time, a high SST anomaly is also generated in the off-equatorial North Pacific through deepening of the upper ocean thermocline due to an accompanying anticyclonic surface wind anomaly aloft. While the subtropical North Atlantic SSTs may help the subdecadal warming in the equatorial Pacific, the resultant SST anomalies show a one-year delay in the phase transition and are modestly accompanied by ocean thermocline deepening. Discussion It roughly follows the IMRaD format.