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Characterization of aerosols over oceanic regions around India during pre-monsoon 2006

机译：2006年季风爆发前印度周围海洋区域的气溶胶特征

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摘要

Ship cruise observations of aerosol optical properties have been carried out over oceanic areas around India during pre-monsoon season of 2006. The results reveal rather significant day-to-day variability in aerosol optical thickness (AOT). Aerosol loading is found to be relatively high over the Bay of Bengal (BoB) i.e., AOT at 500 nm is 0.36 ± 0.12 which is higher than those over Arabian Sea (AS) i.e., 0.23 ± 0.09 and North Indian Ocean (NIO) i.e., 0.26 ±0.10. Dominance of fine-mode (α = 1.21 ±0.11) and coarse-mode (α = 0.86 ± 0.20) aerosol particles has been observed, respectively, over the BoB and AS regions. Second order Angstrom exponent shows predominant positive and negative curvatures over BoB and AS, respectively. High fine-mode aerosol loading over BoB is found to be associated with air masses originating from northeastern Indo-Gangetic plains and southeastern Myanmar. The observed short wave solar flux decrease due to aerosol extinction is found to be 24,19 and 21 W m~(-2) for the BoB, AS and NIO, respectively.
机译：在2006年的季风前季节期间，已在印度周围的海洋地区进行了对气溶胶光学特性的船舶巡航观测。结果表明，气溶胶光学厚度（AOT）的日常变化相当大。发现孟加拉湾（BoB）上的气溶胶负载相对较高，即500 nm处的AOT为0.36±0.12，高于阿拉伯海（AS）的0.23±0.09和北印度洋（NIO）的气溶胶负载。 ，0.26±0.10。在BoB和AS区域分别观察到精细模式（α= 1.21±0.11）和粗模式（α= 0.86±0.20）气溶胶颗粒的优势。二阶埃斯特罗姆指数分别在BoB和AS上显示出主要的正曲率和负曲率。发现在BoB上的高精细模式气溶胶负荷与源自印度东北部恒河平原和缅甸东南部的空气团有关。对于BoB，AS和NIO，观测到的由于气溶胶消光引起的短波太阳通量减少分别为24,19和21 W m〜（-2）。

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