How does downward planetary wave coupling affect polar stratospheric ozone in the Arctic winter stratosphere
How does downward planetary wave coupling affect polar stratospheric ozone in the Arctic winter stratosphere
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DOI：
10.5194/acp-17-2437-2017
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发表时间：
2016-08
影响因子：
6.3
通讯作者：
Sandro W. Lubis;V. Silverman;K. Matthes;N. Harnik;N. Omrani;S. Wahl
中科院分区：
文献类型：
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作者：
Sandro W. Lubis;V. Silverman;K. Matthes;N. Harnik;N. Omrani;S. Wahl
抽象的。众所周知，平流层冬季行星波强迫的变化通过极涡和剩余环流强度的变化控制着北极平流层臭氧的变化。虽然以前的研究主要集中在进入平流层下部的向上波通量的变化，在这里向下的行星波反射对臭氧的影响进行了研究的第一次。利用MERRA 2再分析和与社区地球系统模式完全耦合的化学-气候模拟（CESM 1（WACCM）），我们发现了两个向下波反射对臭氧的影响：（1）冬季减弱残余环流的直接影响，减少了上升行星波事件造成的臭氧的典型增加，以及（2）冬季极地温度的变化对春季臭氧破坏量的间接影响。冬季以向下波反射事件为主（即，反射冬季）的特点是北极臭氧浓度较低，而季节主要是上升波事件增加（即，吸收性冬季）的特点是臭氧浓度相对较高。这一行为与冬季下行和上行行星波事件通过剩余环流和极地温度对极地平流层臭氧的累积效应是一致的。这些结果通过突出波反射的关键作用，为控制北极平流层臭氧变化的动力过程提供了一个新的视角。
Abstract. It is well established that variable wintertime planetary wave forcing in the stratosphere controls the variability of Arctic stratospheric ozone through changes in the strength of the polar vortex and the residual circulation. While previous studies focused on the variations in upward wave flux entering the lower stratosphere, here the impact of downward planetary wave reflection on ozone is investigated for the first time. Utilizing the MERRA2 reanalysis and a fully coupled chemistry–climate simulation with the Community Earth System Model (CESM1(WACCM)) of the National Center for Atmospheric Research (NCAR), we find two downward wave reflection effects on ozone: (1) the direct effect in which the residual circulation is weakened during winter, reducing the typical increase of ozone due to upward planetary wave events and (2) the indirect effect in which the modification of polar temperature during winter affects the amount of ozone destruction in spring. Winter seasons dominated by downward wave reflection events (i.e., reflective winters) are characterized by lower Arctic ozone concentration, while seasons dominated by increased upward wave events (i.e., absorptive winters) are characterized by relatively higher ozone concentration. This behavior is consistent with the cumulative effects of downward and upward planetary wave events on polar stratospheric ozone via the residual circulation and the polar temperature in winter. The results establish a new perspective on dynamical processes controlling stratospheric ozone variability in the Arctic by highlighting the key role of wave reflection.