The authors examined the Madden-Julian Oscillation (MJO) in stratospheric ozone during boreal winter using a simulation from the Specified Dynamics version of the Whole Atmosphere Community Climate Model (SD-WACCM) in 2004 and 2010. Comparison with European Centre for Medium-Range Weather Forecasts Interim Reanalysis (ERA-Interim) data suggested that the model simulation represented well the three-dimensional structure of the MJO-related ozone anomalies in the upper troposphere and stratosphere (i.e., between 200 and 20 hPa). The negative ozone anomalies were over the Tibetan Plateau and East Asia in MJO phases 3–7, when the MJO convective anomalies travelled from the equatorial Indian Ocean towards the equatorial western Pacific Ocean. Due to the different vertical structures of the MJO-related circulation anomalies, the MJO-related stratospheric ozone anomalies showed different vertical structure over the Tibetan Plateau (25–40°N, 75–105°E) and East Asia (25–40°N, 105–135°E). As a result of the positive bias in the model-calculated ozone in the upper troposphere and lower stratosphere, the amplitude of MJO-related stratospheric ozone column anomalies (10–16 Dobson Units (DU)) in the SD-WACCM simulation was slightly larger than that (8–14 DU) in the ERA-Interim reanalysis.
本研究利用美国NCAR的WACCM模式研究了北半球冬季Madden-Julian Oscillation（MJO）对亚洲地区平流层臭氧浓度的影响。模拟结果表明：当MJO的对流异常从赤道印度洋向赤道西太平洋传播时，会依次造成青藏高原与东亚地区平流层臭氧浓度减少，但臭氧异常的垂直结构在青藏高原与东亚地区具有显著差异。由于WACCM模式的系统性偏差，模拟的MJO臭氧异常比再分析资料结果略偏强。