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首页> 外文期刊>ournal of the Meteorological Society of Japan >Characteristics of Aeolian Dust Observed by Sky-Radiometer in the Intensive Observation Period 1 (IOP1)
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Characteristics of Aeolian Dust Observed by Sky-Radiometer in the Intensive Observation Period 1 (IOP1)

机译：密集观测期1（IOP1）中的天辐射仪观测的风沙尘特征

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A sky-radiometer network was developed in order to investigate the characteristics of aeolian dust on the way of transportation from the source region to the Japan area. From the analysis of the sky-radiometer data, optical thickness in the visible to near infrared regions and size spectrum from radius 0.0l to 5 μm can be obtained. Five observation sites are set at Aksu, Qira, Shapotou, Qingdao, and Beijing in China, and four observation sites at Naha, Fukuoka, Nagoya and Tsukuba in Japan. The data of six observation sites (Qira, Shapotou, Naha, Fukuoka, Nagoya and Tsukuba) are automatically transferred to Meteorological Research Institute (MRI) through telephone lines.The following results were obtained from the data analysis of intensive observation period (IOP) in Apri1, 2002. (1) The data with Ångström exponent between 0.0 and 0.5 corresponds to the dust event day data. (2) The contribution of the particles with radius greater than 0.5 μm, which correspond to coarse dust particles, to the total optical thickness frequently exceeds more than ∼70% in the source region, and exceeds in Qingdao and sites in Japan on the dust event day. (3) The contribution of particles with radius greater than 0.5 μm to the total volume is more than ∼80% on the dust event day. (4) The retrieved volume spectrum in the source region, Aksu and Qira, is not dependent on the optical thickness. This means that the floating aerosols mainly consist of dust particles in the source region. (5) The total volume observed in Japan sites is one third of that in the source region. (6) When the size distribution for the coarse mode (r 0.5 μm) is approximated by log-normal size distribution, effective radius reff is 2.1 to 2.3 μm in China sites and 1.6 to 1.8 μm in Japan sites. rg is about 0.7 μm at Aksu, Qira, and Shapotou and about 0.5 μm at other sites (ln rg is the center of log-normal size distribution). The width of size distribution (σg) is scattered between O.67 and O.87. These difference of size distribution among the observation sites are caused by the modification of air mass including aeolian dust; coarser dust particles are partially removed during the transportation, and the air mass including aeolian dust as a main component are partially contaminated by the aerosol into the atmosphere from anthropogenic activities. The observation network of ADEC caught this change clearly.
机译：为了研究从源区到日本地区的运输方式中的风尘特征，开发了一个天辐射仪网络。通过对天辐射仪数据的分析，可以获得可见光到近红外区域的光学厚度以及半径为0.0l至5μm的尺寸谱。在中国的阿克苏，切拉，沙坡头，青岛和北京设有五个观测点，在日本的那霸，福冈，名古屋和筑波设有四个观测点。通过电话线将六个观测站点（Qira，Shapotou，那霸，福冈，名古屋和筑波）的数据自动通过电话传输到气象研究所（MRI）。 2002年4月1日。（1）Ångström指数在0.0到0.5之间的数据对应于尘埃事件发生日数据。 （2）对应于粗尘粒的半径大于0.5μm的颗粒在源区中对总光学厚度的贡献经常超过70％以上，在青岛和日本的尘埃上超过活动日。 （3）在尘埃发生日，半径大于0.5μm的颗粒对总体积的贡献大于〜80％。 （4）在源区域Aksu和Qira中检索到的体积光谱与光学厚度无关。这意味着漂浮的气溶胶主要由源区中的尘埃颗粒组成。 （5）在日本站点观察到的总体积是源区域的三分之一。 （6）当通过对数正态尺寸分布近似粗模式的尺寸分布（r> 0.5μm）时，中国地区的有效半径reff为2.1至2.3μm，日本地区为1.6至1.8μm。阿克苏（Aksu），奇拉（Qira）和沙坡头（Shapotou）的rg约为0.7μm，其他位置的rg约为0.5μm（ln rg是对数正态尺寸分布的中心）。尺寸分布的宽度（σg）分散在O.67和O.87之间。这些观测点之间大小分布的差异是由于改变了包括风尘在内的空气质量而引起的。在运输过程中，部分较粗的尘埃颗粒会被清除，而包括风尘在内的主要空气成分会因人为活动而被气溶胶部分污染到大气中。 ADEC的观察网络清楚地注意到了这一变化。

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