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首页> 外文期刊>Atmospheric environment >Distribution of ozone in the marine boundary layer of Arabian Sea prior to monsoon: Prevailing airmass and effect of aerosols
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Distribution of ozone in the marine boundary layer of Arabian Sea prior to monsoon: Prevailing airmass and effect of aerosols

机译：季风之前阿拉伯海海洋边界层中臭氧的分布：普遍存在的气团和气溶胶效应

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摘要

Surface ozone (O_3) measurements were carried out in the marine environment of the Arabian Sea (AS) during the premonsoon months, April-May 2006, as part of the Integrated Campaign for Aerosols, gases and Radiation Budget. The O3 mixing ratio over the AS varied in the range ～3-22 ppb with a mean of 13.5 ± 2 ppb. Comparatively high mixing ratios were observed over the southern AS and close to the coast. The spatial pattern did not show any evidence of transport from nearby landmass or in situ photochemistry. Longitudinally separated narrow regions of low and high O_3 were seen over the southern AS. The role of aerosols in modifying the O_3 concentration was examined based on the co-located measurement of aerosol mass loading, number density, size distribution and optical depth. The O3 mixing ratio showed positive correlation with aerosol loading. Over high O_3 regions, large particle concentration showed significant enhancement. The role of chloride ion in depleting O_3 was also investigated. The observed spatial features were compared with those measured during the earlier cruises conducted in different seasons and over various oceanic regions. A comparison has been made with the measurements over the Bay of Bengal during the same cruise.
机译：作为气溶胶，气体和辐射预算综合运动的一部分，在2006年4月至5月的季风月份期间，在阿拉伯海（AS）的海洋环境中进行了表面臭氧（O_3）测量。在AS上的O3混合比在〜3-22 ppb范围内变化，平均值为13.5±2 ppb。在南部AS和靠近海岸的地区观察到较高的混合比。空间格局没有显示出来自附近陆地的运输或原位光化学的任何证据。在南部AS上看到了纵向上分开的低O_3和高O_3的狭窄区域。基于对气溶胶质量负荷，数量密度，尺寸分布和光学深度的共同定位测量，研究了气溶胶在改变O_3浓度中的作用。氧气的混合比与气溶胶负荷呈正相关。在高O_3区域，大颗粒浓度显示出明显的增强。还研究了氯离子在消耗O_3中的作用。将观测到的空间特征与在不同季节和不同海洋区域进行的较早航行中所测得的空间特征进行了比较。在同一次航行中，对孟加拉湾的测量结果进行了比较。

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