Aerosol radiative characteristics at Gosan, Korea, during the Atmospheric Brown Cloud East Asian Regional Experiment 2005
Aerosol radiative characteristics at Gosan, Korea, during the Atmospheric Brown Cloud East Asian Regional Experiment 2005
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DOI：
10.1029/2007jd008506
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发表时间：
2007-11
影响因子：
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通讯作者：
T. Takamura;N. Sugimoto;A. Shimizu;A. Uchiyama;A. Yamazaki;Kazuma Aoki;T. Nakajima;B. Sohn;H. Takenaka
中科院分区：
文献类型：
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作者：
T. Takamura;N. Sugimoto;A. Shimizu;A. Uchiyama;A. Yamazaki;Kazuma Aoki;T. Nakajima;B. Sohn;H. Takenaka
[1]2005年3月，在韩国济州岛的Gosan开展了2005年ABC（大气棕色云项目）Gosan活动（EAREX 2005）。该活动的目的是澄清气溶胶特性，并比较每种仪器的辐射和化学观测。从这些观测资料中，选择了11个晴空个例进行分析，以估计气溶胶辐射效应（ARE）。结果表明，在整个活动期间，地面平均辐射强度为-20.8 ± 9.0W/m2，大气顶部为-8.3 ± 5.3W/m2，大气中为12.6 ± 6.8W/m2。ARE效率分别为-81.6W/m2、-32.5W/m2和49.4W/m2。这些结果表明，在竞选期间的气溶胶可能包括更多或更少的黄沙相比，使用典型的气溶胶模式模拟的结果。在激光雷达同时观测退偏振比的基础上，还发现了一个共同的黄沙特征，即气溶胶的日变化趋势。一个黄沙指数（YSI）的引入使用的球形和非球形粒子的消光系数的列积分，分离经验的退偏振比。该指数相当于观测到的气溶胶光学厚度中黄沙（非球形）气溶胶的分数。YSI与天空辐射计观测得到的Angstrom指数（a）有很好的相关性，表明YSI的增大对应于Angstrom指数（a）的减小和气溶胶单次散射能力的增大。然而，YSI与ARE效率的相关性很差。
[1] The ABC (Atmospheric Brown Cloud project) Gosan campaign 2005 (EAREX2005) was carried out at Gosan on Cheju Island, Korea, in March 2005. The objective of the campaign was to clarify aerosol characteristics as well as to compare each instrument for radiation and chemical observation. From these observations, eleven clear sky cases were selected and analyzed to estimate the aerosol radiative effect (ARE). As a result, the mean ARE during the campaign was -20.8 ± 9.0 W/m 2 at the surface, -8.3 ± 5.3 W/m 2 at the top of the atmosphere and 12.6 ± 6.8 W/m 2 in the atmosphere. The ARE efficiency was -81.6 W/m 2 , -32.5 W/m 2 and 49.4 W/m 2 , respectively. These results suggest that the aerosols during the campaign might consist of more or less yellow sand in comparison with the results simulated using typical aerosol models. On the basis of simultaneous observation of the depolarization ratio by lidar, a common feature of yellow sand is also found in a daily trend of aerosols through the period. A yellow sand index (YSI) is introduced using a column integration of extinction coefficients for spherical and nonspherical particles, separated empirically by the depolarization ratio. This index is equivalent to the fraction of yellow sand (nonspherical) aerosol in the observed aerosol optical thickness. The YSI has a good correlation with the Angstrom index (a) obtained by sky radiometer observations and shows that the increase in YSI corresponds to the decrease in a and the increase in single scattering albedo of aerosol. However, the YSI is poorly correlated with the ARE efficiency.