Influence of stratospheric airmasses on tropospheric vertical O3 columns based on GOME (Global Ozone Monitoring Experiment) measurements and backtrajectory calculation over the Pacific
Influence of stratospheric airmasses on tropospheric vertical O3 columns based on GOME (Global Ozone Monitoring Experiment) measurements and backtrajectory calculation over the Pacific
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DOI：
10.5194/acp-4-903-2004
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发表时间：
2004-06-21
影响因子：
6.3
通讯作者：
Burrows, JP
中科院分区：
文献类型：
--
作者：
Ladstätter-Weissenmayer, A;Meyer-Arbek, J;Burrows, JP
基于卫星的全球臭氧测量实验（GOME）数据用于描述热带太平洋上空对流层臭氧的数量。对流层臭氧用对流层过量法（TEM）测定。在热带太平洋，发现了显著的季节变化。在9月至11月的生物质燃烧季节，由于大陆的外流，对流层臭氧过剩增强。1999年9月，国美电器的数据显示，塔希提岛（南纬18.0度；西经149.0度）（东太平洋）上空臭氧柱较美国增加。萨摩亚（南纬14.23度，西经170.56度）和斐济（南纬18.13度，东经178.40度），都位于西太平洋。反轨迹计算表明，到达这三个地点上空的气团都没有受到人为污染（如生物质燃烧）。因此，必须考虑其他臭氧来源。导致对流层臭氧增加的一个可能过程是平流层-对流层交换。对到达每个地点上空的轨迹的潜在涡度的分析表明，与关岛相比，塔希提的气团受到更强的平流层影响。萨摩亚和斐济。因此，这项研究清楚地显示了从平流层向对流层输送气团的事件。
Satellite based GOME ( Global Ozone Measuring experiment) data are used to characterize the amount of tropospheric ozone over the tropical Pacific. Tropospheric ozone was determined from GOME data using the Tropospheric Excess Method (TEM). In the tropical Pacific a significant seasonal variation is detected. Tropospheric excess ozone is enhanced during the biomass burning season from September to November due to outflow from the continents. In September 1999 GOME data reveal an episode of increased excess ozone columns over Tahiti (18.0degrees S; 149.0degrees W) ( Eastern Pacific) compared to Am. Samoa (14.23degrees S; 170.56degrees W) and Fiji (18.13degrees S; 178.40degrees E), both situated in the Western Pacific. Backtrajectory calculations show that none of the airmasses arriving over the three locations experienced anthropogenic pollution ( e. g. biomass burning). Consequently other sources of ozone have to be considered. One possible process leading to an increase of tropospheric ozone is stratosphere-troposphere-exchange. An analysis of the potential vorticity along trajectories arriving above each of the locations reveals that airmasses at Tahiti are subject to enhanced stratospheric influence, compared to Am. Samoa and Fiji. As a result this study shows clear incidents of transport of airmasses from the stratosphere into the troposphere.