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首页> 外文期刊>Atmospheric environment >Dynamical nature of tropospheric ozone over a tropical location in Peninsular India: Role of transport and water vapour
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Dynamical nature of tropospheric ozone over a tropical location in Peninsular India: Role of transport and water vapour

机译：印度半岛热带地区对流层臭氧的动力学性质：运输和水蒸气的作用

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This paper deals with the temporal changes in the altitude distribution of tropospheric ozone (O-3) based on the measurements by balloon-borne O-3-sondes during 2011-2014, conducted at the tropical, coastal site Thiruvananthapuram on the south west coast of India. This is the first study from this region addressing the highly dynamic nature of tropospheric O-3 profiles (in terms of their vertical structure and short-term changes) and attempting to categorise them based on 121 in-situ measured O-3 profiles. The tropospheric O-3 profiles could be categorised into four major groups namely (i) those with steady O-3 mixing ratio (ii) with increasing mixing ratio, (iii) with mid-tropospheric enhancement and (iv) with multiple layers/laminar nature. The causative mechanisms of these different categories were examined. The observed differences in the tropospheric O-3 distribution are attributed to meteorological conditions in particular the synoptic scale systems, long range transport, intrusion from stratosphere and photochemistry, most importantly, the effect of water vapour content. Water vapour and O-3 showed complex dependence with positive and negative association depending on the precursor levels and availability of water vapour. The altitudinal changes in O-3 also exhibited close association with those of potential temperature and equivalent potential temperature. An analysis of the seasonal characteristics of vertical distribution of tropospheric O-3 also carried out along with the altitude-dependent seasonal behaviour. In general, the total column O-3 estimated by the integration of O-3-sonde retrieved profiles differed by about +/- 10% with those retrieved by satellite-based measurements. The TCO contributes to about 16% (34 DU) of the total column O-3, with minimum of 9% in October and maximum of 27% on March. In general, the OMI retrievals under-estimates the O-3-sonde derived TCO by 5-10 DU in all the seasons.
机译：本文基于对球对流臭氧（O-3）的海拔高度分布的时间变化，基于2011-2014年在西南沿海热带提卢湾安塔普兰（Thiruvananthapuram）进行的气球运载O-3-sondes观测印度。这是该地区针对对流层O-3剖面的高度动态特性（就其垂直结构和短期变化而言）的首次研究，并试图根据121个原位测量的O-3剖面对它们进行分类。对流层O-3剖面可分为四个主要类别，即（i）具有稳定O-3混合比的那些（ii）随着混合比的增加，（iii）对流层中部增强和（iv）多层/层状性质。研究了这些不同类别的原因机制。对流层O-3分布的观测差异归因于气象条件，特别是天气尺度系统，远距离迁移，平流层侵入和光化学作用，最重要的是水蒸气含量的影响。水蒸气和O-3表现出复杂的依赖性，具有正负关联，具体取决于前体水平和水蒸气的可用性。 O-3的高度变化也与潜在温度和等效潜在温度的变化密切相关。还对对流层O-3垂直分布的季节特征以及与海拔有关的季节性行为进行了分析。一般而言，通过整合O-3-sonde探空剖面估算出的总O-3列与基于卫星的测量结果相差约+/- 10％。 TCO占O-3色谱柱总量的16％（34 DU），10月最低为9％，3月最高为27％。通常，OMI检索在所有季节都低估了O-3探空仪得出的TCO 5-10 DU。

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