Large-and-Sparse-particle Clouds (LSC): Clouds which are subvisible for space-borne lidar and observable for space-borne cloud radar
Large-and-Sparse-particle Clouds (LSC): Clouds which are subvisible for space-borne lidar and observable for space-borne cloud radar
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大稀疏粒子云（LSC）：星载激光雷达可见的云，星载云雷达可观测的云
DOI：
10.1016/j.polar.2019.05.003
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发表时间：
2019
期刊：
影响因子：
1.8
通讯作者：
Sugidachi T.
中科院分区：
文献类型：
--
作者：
Iwasaki S.;Seguchi T.;Okamoto H.;Sato K.;Katagiri S.;Fujiwara M.;Shibata T.;Tsuboki K.;Ono T.;Sugidachi T.
大而稀疏粒子云（LSC）的特征是大粒子尺寸（半径> 50 μm）和小数量浓度（<104 m −3），使用星载激光雷达，云-气溶胶正交偏振激光雷达（CALIOP）和星载94-GHz云廓线雷达（CPR）进行观测。与CPR相比，CALIOP对LSC的敏感性较低，因为LSC的粒度分布;因此，云的类型与通常的云不同，因为当没有激光雷达衰减时，与CPR相比，CALIOP通常对云更敏感。引入了一个经验标准来识别来自CALIOP和CPR数据的LSC。资料分析表明，LSC倾向于出现在高纬度地区。LSC的寿命将在小时的数量级，因为LSC粒子的终端速度超过1 km h−1。LSC不会是连续下降，因为上面没有云。LSC似乎破坏过冷云（SC），因为它们的云顶高度比SC高，因为LSC和SC不倾向于共存。由于其光学厚度薄，LSC并不直接影响辐射强迫;然而，LSC可能通过SC分布的变化间接影响辐射强迫。
Large-and-Sparse-particle Clouds (LSC), characterized by large particle size (radius > 50 μm) and small number concentration (<104m−3), were observed with the space-borne lidar, Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), and with the space-borne 94-GHz cloud profiling radar (CPR). CALIOP was found to be less sensitive to the LSC as compared to CPR because of the particle size distribution of LSC; hence, the cloud type is different from usual ones because CALIOP is generally more sensitive to clouds as compared to CPR when there is no lidar attenuation. An empirical criterion was introduced to identify the LSC from CALIOP and CPR data. The data analysis showed that the LSC tend to appear at high latitudes. The lifetime of LSC would be in the order of hours, because the terminal velocity of LSC particles exceeded 1 km h−1. LSC would not be fallstreak because no cloud existed above. LSC appeared to destroy supercooled clouds (SC) because their cloud top heights were higher as compared to SC, and because LSC and SC did not tend to coexist. Because of their thin optical depth, LSC did not directly impact radiative forcing; however, LSC may indirectly influence radiative forcing through changes in the distribution of SC.