Near micron‐sized cirrus cloud particles in high‐resolution infrared spectra: An orographic case study
Near micron‐sized cirrus cloud particles in high‐resolution infrared spectra: An orographic case study
复制标题
高分辨率红外光谱中近微米大小的卷云颗粒：地形案例研究
DOI：
10.1029/2003gl016909
复制
发表时间：
2003
影响因子：
5.2
通讯作者：
V. Realmuto
中科院分区：
文献类型：
--
作者：
B. Kahn;A. Eldering;S. Clough;E. Fetzer;E. Fishbein;M. Gunson;Sung;P. Lester;V. Realmuto
大气红外探测器（AIRS）的高分辨率光谱提供了以小颗粒为主的卷云的全球视图，它们存在于比以前的飞机活动更大的空间范围内。如使用平面平行散射辐射传输（RT）模型和真实冰粒形状的模拟所示，大气窗口中的辐射光谱的形状受到小冰晶的独特影响。在RT模拟和AIRS光谱中，对于小于3 μm的冰粒，在800至850 cm−1之间的亮度温度（BT）光谱中可以看到最小值。2002年10月2日在南美洲中部安第斯山脉上空观测到的一个地形卷云的个例研究，在998和811 cm−1之间的光谱BT差异高达63 K。
The high‐resolution spectra of the Atmospheric Infrared Sounder (AIRS) provide a global view of small‐ particle‐dominated cirrus clouds, and they exist over much larger spatial extents than seen in previous aircraft campaigns. As shown by simulations using a plane‐parallel scattering radiative transfer (RT) model and realistic ice particle shapes, the shape of the radiance spectra in the atmospheric windows is uniquely influenced by small ice crystals. Minima in the brightness temperature (BT) spectra between 800 to 850 cm−1 are seen for ice particles smaller than 3 μm in the RT simulations and AIRS spectra. A case study of an orographic cirrus cloud observed on October 2, 2002, over the central Andes of South America is presented with spectral BT differences up to 63K between 998 and 811 cm−1.