Observed Zonal Variations of the Relationship between ITCZ Position and Meridional Temperature Contrast
Observed Zonal Variations of the Relationship between ITCZ Position and Meridional Temperature Contrast
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DOI：
10.3390/cli10030030
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发表时间：
2022-02
期刊：
影响因子：
3.7
通讯作者：
Eric Mischell;Jung‐Eun Lee
中科院分区：
文献类型：
--
作者：
Eric Mischell;Jung‐Eun Lee
虽然热带辐合带（ITCZ）的纬向平均位置可以用纬向平均能量框架很好地解释，但ITCZ的区域变化更难描述。我们展示了一个简单的度量，半球间热带海表温度（SST）的对比，是有用的估计本地ITCZ位置在现代观测的季节和年际时间尺度。我们证明了一个线性之间的对应关系SST的对比度和ITCZ的位置跨海洋部门。虽然ITCZ位置对SST对比度的敏感度始终呈线性，但根据位置的不同，其敏感度从~1°/K到~7°/K不等。我们还发现，西太平洋年际ITCZ的位置与北大西洋的温度呈负相关。这一结果可能有助于限制ITCZ过去和未来的区域迁移。
While the zonal-mean position of the intertropical convergence zone (ITCZ) is well explained using the zonal-mean energetic framework, the regional variations of the ITCZ have been more difficult to characterize. We show a simple metric, the interhemispheric tropical sea surface temperature (SST) contrast, is useful for estimating the local ITCZ position over seasonal and interannual timescales in modern observations. We demonstrate a linear correspondence between the SST contrast and ITCZ position across oceanic sectors. Though consistently linear, the sensitivity of the ITCZ position to the SST contrast varies from ~1°/K to ~7°/K depending on location. We also find that the location of the Western Pacific interannual ITCZ is negatively correlated with the temperature of the North Atlantic Ocean. This result may help put constraints on past and future regional migrations of the ITCZ.