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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >N2O TRANSPORT IN A THREE-DIMENSIONAL MODEL DRIVEN BY UK METEOROLOGICAL OFFICE WINDS
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N2O TRANSPORT IN A THREE-DIMENSIONAL MODEL DRIVEN BY UK METEOROLOGICAL OFFICE WINDS

机译：英国气象局风驱动的二维模型中的N2O传输

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A three-dimensional spectral chemical transport model truncated at T21 is employed to simulate N2O transport. The wind and vertical motion fields are taken from the U.K. Meteorological Office four-dimensional assimilation dataset. UARS cryogenic limb array etalon spectrometer (CLAES) N2O measurements are used to initialize the model in late August 1992. Model results are shown to simulate the CLAES measurements quite well over the first few months: N2O variability is similar at extratropical latitudes in the southern hemisphere over the period September 2-17, 1992, at 4.6 and 10 mbar, and there is good agreement in the synoptic maps of minor warmings during this period. Prior to a large warming event on September 30, minor stratospheric warmings are shown to produce negligible changes in the vortex below 4.6 mbar, but considerable mixing of air from the vortex edge and subtropical air is indicated. This results in a steepening of the N2O gradient at the vortex edge. During a warming event when the vortex center moves away from the pole, downward transport by the residual circulation can be large. This is offset by eddy transport effects, but these terms reverse during the recovery from the warming. From September 2 to 17, there is evidence of continuous mixing at midlatitudes at 4.6 mbar in contrast to more discontinuous, warming-associated mixing at 10 mbar. The breakup of the vortex is initiated by the September 30 warming, and a warming on October 13 has a strong influence on the breakup. The breakup propagates downward. The climatological distribution of N2O in the tropics follows the seasonal variation of the solar radiation with a maximum, which is determined by the strength of the upward residual motion, shifting towards the summer hemisphere by 10 degrees-15 degrees latitude. The surf zone in both the model and the observations at the middle latitudes is well defined, but the gradients of N2O at the edge of the tropics and at the edge of the vortex are smaller in the model than in the observations. This is probably being caused by excessive mixing in the model. [References: 56]
机译：在T21处截断的三维光谱化学传输模型用于模拟N2O传输。风和垂直运动场取自英国气象局的四维同化数据集。 UARS低温肢体阵列标准具分光光度计（CLAES）N2O测量值于1992年8月下旬用于初始化模型。显示的模型结果在最初的几个月中很好地模拟了CLAES测量值：南半球的温带纬度的N2O变异性相似。在1992年9月2日至17日的4.6和10 mbar时，在此期间的小幅增温天气图上有很好的一致性。在9月30日发生大型变暖事件之前，平流层较小的变暖表明在4.6 mbar以下的涡流中产生的变化可忽略不计，但显示出来自涡流边缘的空气与亚热带空气的大量混合。这导致在涡流边缘的N2O梯度变陡。在变暖事件中，当涡旋中心移离极点时，残留循环的向下传输可能很大。涡流效应抵消了这一点，但是这些术语在从变暖中恢复期间是相反的。从9月2日至17日，有证据表明在中纬度在4.6 mbar下会持续混合，而在10 mbar上会出现更多与温度相关的不连续混合。涡旋的破裂是由9月30日的变暖开始的，而10月13日的变暖对破裂有很大的影响。分解向下传播。 N2O在热带地区的气候分布遵循太阳辐射的季节变化最大值，该变化取决于向上的残余运动强度，向夏季半球移动纬度为10度至15度。模型和中纬度观测资料中的海浪区都得到了很好的定义，但是在热带地区和涡旋边缘的N2O梯度在模型中要比观测值小。这可能是由于模型中的过度混合引起的。 [参考：56]

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