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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Spatial gradients in aerosol characteristics over the Arabian sea and Indian ocean
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Spatial gradients in aerosol characteristics over the Arabian sea and Indian ocean

机译：阿拉伯海和印度洋气溶胶特征的空间梯度

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摘要

Aerosol spectral optical depths (tau(p lambda)) estimated at 10 wavelengths in the visible and near infrared range over oceanic regions covering near and far coastal regions of the Arabian Sea and remote areas of the equatorial Indian Ocean adjoining the Indian peninsula have been used to study the spatial variation of aerosol optical depths over the ocean. Size parameters and concentrations of aerosols along the downwind direction have been derived with a view to studying the effect of the continent on aerosol properties over the ocean. The studies showed a gradual decrease in tau(p lambda) with fetch distance D with an e(-1) scaling distance in the range of 1700 to 2400 km under calm to moderate wind conditions. The scaling distance increases with increase in wind speed. A significant increase in the relative concentration of small (accumulation size range) particles is seen as the continent is approached from deeper oceanic regions downwind, indicating increased influence of anthropogenic activities. The coarse-particle concentration appears to be of oceanic origin and remains nearly steady over the entire region when the winds are low to moderate. [References: 28]
机译：使用了覆盖阿拉伯海近海和远海沿岸地区以及与印度半岛毗邻的赤道印度洋偏远地区的海洋区域在可见光和近红外范围内的10个波长处估计的气溶胶光谱光学深度（tau（p lambda））研究海洋上气溶胶光学深度的空间变化。为了研究大陆对海洋气溶胶特性的影响，已经推导出了顺风方向的气溶胶尺寸参数和浓度。研究表明，在平静至中等风速条件下，随着取距D的e（-1）缩放距离在1700至2400 km范围内，tau（p lambda）逐渐减小。缩放距离随着风速的增加而增加。当从更深的海洋区域顺风进入大陆时，可以看到小颗粒（累积尺寸范围）的相对浓度显着增加，这表明人为活动的影响增加。当风向低至中度时，粗颗粒浓度似乎是海洋来源，并且在整个区域几乎保持稳定。 [参考：28]

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