Journal of Geophysical Research: Atmospheres The role of monsoon-like zonally asymmetric heating in interhemispheric transport
Journal of Geophysical Research: Atmospheres The role of monsoon-like zonally asymmetric heating in interhemispheric transport
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地球物理研究杂志：大气类季风带状不对称加热在半球间输送中的作用
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通讯作者：
F. Lindenberg
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作者：
E. Hey‐Hawkins;F. Lindenberg
虽然纬向平均哈德利环流的季节迁移对微量气体半球间运输的重要性已经得到承认，但很少有研究考察纬向不对称季风环流的作用。本研究使用干燥大气模式，通过理想化的牛顿弛豫强迫达到规定的辐射平衡温度，研究了季风样纬向不对称加热在半球间运输中的作用。当只考虑纬向对称加热的季节循环时，南半球空气自最后一次接触北半球中纬度边界层以来的平均年龄比观测值大得多。季风样纬向不对称加热的引入不仅使对流层空气的平均年龄降低到更真实的值，而且在北方夏季产生了对流层上层穿越赤道的输送路径，类似于美国宇航局全球模拟倡议化学输送模式模拟的输送路径，该模式采用现代回顾性分析驱动的研究和应用气象领域。这些结果表明，季风引起的涡旋环流在长寿命化学成分的半球间运输中起着重要作用。•仅纬向平均Hadley环流的季节循环就会导致半球间运输•额外的季风样加热会将半球间运输加速到更现实的值•季风样加热会产生对流层上层跨赤道运输途径
While the importance of the seasonal migration of the zonally averaged Hadley circulation on interhemispheric transport of trace gases has been recognized, few studies have examined the role of the zonally asymmetric monsoonal circulation. This study investigates the role of monsoon-like zonally asymmetric heating on interhemispheric transport using a dry atmospheric model that is forced by idealized Newtonian relaxation to a prescribed radiative equilibrium temperature. When only the seasonal cycle of zonally symmetric heating is considered, the mean age of air in the Southern Hemisphere since last contact with the Northern Hemisphere midlatitude boundary layer is much larger than the observations. The introduction of monsoon-like zonally asymmetric heating not only reduces the mean age of tropospheric air to more realistic values but also produces an upper tropospheric cross-equatorial transport pathway in boreal summer that resembles the transport pathway simulated in the NASA Global Modeling Initiative Chemistry Transport Model driven with Modern-Era Retrospective Analysis for Research and Applications meteorological fields. These results highlight that the monsoon-induced eddy circulation plays an important role in the interhemispheric transport of long-lived chemical constituents. • The seasonal cycle of the zonally averaged Hadley cell alone results in interhemispheric • Additional monsoon-like heating accelerates interhemispheric transport to more realistic values • Monsoon-like heating produces an upper tropospheric cross-equatorial transport pathway