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首页> 外文期刊>Atmospheric chemistry and physics >Correlating tropospheric column ozone with tropopause folds: the Aura-OMI satellite data
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Correlating tropospheric column ozone with tropopause folds: the Aura-OMI satellite data

机译：对流层臭氧与对流层褶皱的相关性：Aura-OMI卫星数据

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The geographic and temporal variations in tropospheric andstratospheric ozone columns from individual swath measurements ofthe Ozone Monitoring Instrument (OMI), on the NASA Aura spacecraft,are reasonably well simulated by the University of California,Irvine (UCI) chemistry transport model (CTM) using1°×1°×40-layer meteorological fields forthe year 2005. From the CTM we find that high-frequency spatialvariations in tropospheric column ozone (TCO), including around thejet streams, are not generally correlated with variations instratospheric ozone column, but instead are collocated with foldingevents involving stratospheric-origin, high-ozone layers below thetropopause. The CTM fold events are verified in many cases withavailable ozone sondes. Using the OMI Level 2 profiles, and definingtropopause height from our CTM using the European Centre forMedium-Range Weather Forecasts (ECMWF) fields, we find that most ofthe variations in TCO near CTM folding events are also notcorrelated with those in stratospheric ozone column. A largefraction of the OMI TCO variance is accurately simulated by the CTMwhere the variance is significant, especially along the subtropicaljets. The absolute tropospheric columns from OMI and CTM agreeswath-by-swath, pixel-by-pixel within ±5 Dobson Units (DU) formost cases. Notable exceptions are in the tropics where neither thehigh ozone from biomass burning nor the low ozone in the convergencezones over the Pacific is found in the OMI observations, because ofOMI's insensitivity to the lower troposphere. Another difference isidentified with the OMI profiles near the southern subtropical jet.The CTM has a high bias in stratospheric column outside the tropics,due to problems previously identified with the stratosphericcirculation in the 40-layer meteorological fields. Overall, weidentify ozone folds with short-lived features in TCO that havescales of a few hundred kilometres as observed by OMI.
机译：加利福尼亚大学欧文分校（UCI）化学迁移模型（CTM）使用1°合理地模拟了对空观测层（NASA Aura）上臭氧监测仪（OMI）的单个条带测量得到的对流层和平流层臭氧柱的地理和时间变化。 2005年的×1°×40层气象场。从CTM中我们发现，对流层臭氧（TCO）的高频空间变化（包括射流附近）通常与平流层臭氧的变化不相关，而是并置的与涉及平流层以下的平流层起源的高臭氧层的折叠事件有关。在许多情况下，可用臭氧探测仪验证了CTM折叠事件。使用OMI 2级剖面图，并使用欧洲中距离天气预报中心（ECMWF）字段确定距CTM的对流层顶高度，我们发现CTM折叠事件附近的TCO的大多数变化也与平流层臭氧柱中的变化无关。 CTM可以准确地模拟OMI TCO方差的很大一部分，其中方差很大，尤其是在亚热带喷气机上。在大多数情况下，OMI和CTM的绝对对流层列在±5 Dobson单位（DU）之内逐个，逐个像素一致。在热带地区，由于OMI对低层对流层不敏感，在热带地区没有发现来自生物质燃烧的高臭氧或太平洋收敛带中的低臭氧。另一个差异是由南亚热带急流附近的OMI剖面确定的。由于先前在40层气象领域中发现的平流层环流问题，CTM在热带以外的平流层柱中具有较高的偏差。总体而言，我们确定了TCO中具有短寿命特征的臭氧褶皱，如OMI所观察到的，该褶皱的尺度为几百公里。

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