Study of transport and photochemistry around the tropical tropopause using Chemistry Climate Models

热带气旋周围的温度和其他参数存在明显的亚季节变化。这是由于赤道波、季节内振荡(ISO)和热带有组织对流产生的其他扰动造成的。因此，即使对于模拟和投射平流层臭氧的化学气候模式(CCM)来说，热带对流和热带扰动的适当表示也是至关重要的，因为这些波显著影响平流层-对流层输送过程，并有助于确定最低温度，从而影响热带对流层顶区的脱水过程。在这项研究中，使用一个ZO…分析了四个产生高时频风和温度的CCM(CCSRNIES，CMAM，MRI和WACCM)和五个再分析资料集(ERA40，ERA-TERTERY，JRA25，NCEP/NCAR(NCEP 1)和NCEP-DEO AMIP-II(NCEP2))热带地区100hPa100hPa纬向风和经向风的波动活动更多的NAL-波数-频谱分析方法具有赤道对称-反对称分解。所有数据集中常见的特征是赤道开尔文波和混合Rossby重力OMRG波。在低于0.05周/天的频率下，与这里估计的背景谱相比，大多数ISO没有统计学意义；然而，在这些区域发现了最大功率。赤道Kelvin波、MRG波和对称东移ISO的活动被定义为每个波/扰动在各自的纬向波数频率区的功率谱密度的积分。仅对Kelvin波和MRG波考虑了统计意义。这里的ISO活动是上限。结果表明，五个再分析数据集的波动活动有很大不同。年代的Kelvin波和MRG波的活度是NCEP的2-3倍，而JRA25的则接近平均值。五个再分析数据集的ISO活动(上限)非常相似。四个CCM的波动活动一般都在再分析资料的范围内。WACCM显示了最大的开尔文和MRG波活动，可与各个时代的活动相媲美。CCSRNIES显示最小的Kelvin波活动，MRI显示最小的MRG活动。CCM的ISO活度(上限)大于除CCSRNIES以外的5个再分析资料集的ISO活度。上述结果表明，现有的再分析资料与实际波浪活度相差很大，不能给出实际的波活动。对探空仪数据和GPS掩星温度数据进行分析是研究实际波动活动的必要手段。较少

There exists significant sub-seasonal variability in temperature and other parameters around the tropical troomuse. This is due to equatorial waves, intra-seasonal oscillations (ISOs), and other disturbances that are generated by tropical organized convection. Therefore, appropriate representation of tropical convection and tropical disturbances is crucial even for the Chemistry Climate Models (CCMs) that simulate and project stratospheric ozone, since these waves significantly influence the stratosphere-troposphere transport processes and help determine the coldest temperatures, affecting the dehydration processes in the tropical tropopause region. In this study, the wave activity in temperature and zonal and meridional winds at 100hPa in the tropics is analyzed for four CCMs that produced high time frequency winds and temperatures (CCSRNIES, CMAM, MRI, and WACCM) and for five reanalysis data sets (ERA40, ERA-Interim, JRA25, NCEP/NCAR (NCEP1), and NCEP-DEO AMIP-II (NCEP2)), using a zo … More nal-wavenumber-frequency spectral analysis method with a equatorially symmetric-antisymmetric decomposition.Features commonly observed in all data sets are equatorial Kelvin waves and mixed RossbY gravity OMRG) waves. ISOs, at frequencies smaller than O. 05 cycle per day, are mostly not statistically significant with respect to the background spectra estimated here; however, largest power is found in these regions. The activity for equatorial Kelvin waves, MRG waves, and symmetric eastward-moving ISO is defined as the integration of power spectral density in the respective zonal-wavenumber-frequency region for each wave/disturbance. The statistical significance is considered only for Kelvin and MRG waves. The ISO activity here is the upper limit. Results indicate that five reanalysis data sets have very different wave activities. The Kelvin and MRG wave activities in ERAs are 2-3 times greater than those in NCEPs; those in JRA25 are close to the average. The ISO activity (the upper limit) is rather similar for the five reanalysis data sets. The wave activities in the four CCMs are generally within the range of those in the reanalysis data. WACCM shows the greatest Kelvin and MRG wave activities, which are comparable to those in ERAs. CCSRNIES shows the smallest Kelvin wave activity, and MRI shows the smallest MRG activity. The ISO activity (the upper limit) in the CCMs is greater than that in the five reanalysis data sets except for CCSRNIES.The above results indicate that the reanalysis data currently available do not give the actual wave activities due to their large discrepancy. Analysis of radiosonde data and GPS occultation temperature data is necessary to investigate the actual wave activities. Less