Characterization of Arctic ice cloud properties observed during ISDAC
Characterization of Arctic ice cloud properties observed during ISDAC
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ISDAC 期间观测到的北极冰云特性特征
DOI：
10.1029/2012jd017889
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发表时间：
2012
影响因子：
--
通讯作者：
J. Blanchet
中科院分区：
文献类型：
--
作者：
C. Jouan;É. Girard;J. Pelon;I. Gultepe;J. Delanoë;J. Blanchet
来自地面站点和卫星遥感（CloudSat 和 CALIPSO）的广泛测量揭示了极夜和早春期间北极存在两种类型的冰云（TIC）。第一种类型 (TIC-2A) 顶部覆盖着一层非沉淀性非常小的（雷达看不见的）冰晶 (TIC-1)，在原始环境中更常见，而第二种类型 (TIC-2B) 由两个传感器检测到，优先与高浓度的气溶胶相关。为了进一步研究 TIC-1/2A 和 TIC-2B 的微物理特性，对间接和半直接气溶胶行动 (ISDAC) 期间观察到的特定情况的机载原位和卫星测量进行了分析。首次使用原位云观测对北极 TIC-1/2A 和 TIC-2B 微观结构进行比较。结果表明，它们之间的差异仅限于发生冰核的云层上部。与 TIC-1/2A 相比，TIC-2B 云的特点是冰晶较少（多于 1 个数量级）和较大（2 至 3 倍）以及较大的冰过饱和度（15-20%）。 TIC-2B 云中的冰晶生长似乎是爆炸性的，而 TIC-1/2A 中的冰晶生长似乎更为缓慢。据推测，这些差异与气溶胶的数量浓度和化学成分有关。极冷条件下的冰晶生长速率会影响降水效率、脱水和辐射平衡。这些结果是将先前的建模、遥感和实验室研究与 TIC 云现场观测联系起来的重要且重要的第一步。
Extensive measurements from ground-based sites and satellite remote sensing (CloudSat and CALIPSO) reveal the existence of two types of ice clouds (TICs) in the Arctic during the polar night and early spring. The first type (TIC-2A), being topped by a cover of nonprecipitating very small (radar unseen) ice crystals (TIC-1), is found more frequently in pristine environment, whereas the second type (TIC-2B), detected by both sensors, is associated preferentially with a high concentration of aerosols. To further investigate the microphysical properties of TIC-1/2A and TIC-2B, airborne in situ and satellite measurements of specific cases observed during Indirect and Semi-Direct Aerosol Campaign (ISDAC) have been analyzed. For the first time, Arctic TIC-1/2A and TIC-2B microstructures are compared using in situ cloud observations. Results show that the differences between them are confined in the upper part of the clouds where ice nucleation occurs. TIC-2B clouds are characterized by fewer (by more than 1 order of magnitude) and larger (by a factor of 2 to 3) ice crystals and a larger ice supersaturation (of 15-20%) compared to TIC-1/2A. Ice crystal growth in TIC-2B clouds seems explosive, whereas it seems more gradual in TIC-1/2A. It is hypothesized that these differences are linked to the number concentration and the chemical composition of aerosols. The ice crystal growth rate in very cold conditions impinges on the precipitation efficiency, dehydration and radiation balance. These results represent an essential and important first step to relate previous modeling, remote sensing and laboratory studies with TICs cloud in situ observations.
影响因子：
5.2
作者：
M. Eastwood;S. Cremel;Michael B. Wheeler;B. Murray;É. Girard;A. Bertram
通讯作者：
M. Eastwood;S. Cremel;Michael B. Wheeler;B. Murray;É. Girard;A. Bertram
影响因子：
4.4
作者：
Delanoe, Julien;Hogan, Robin J.
通讯作者：
Hogan, Robin J.
影响因子：
4.4
作者：
Delanoe, Julien;Hogan, Robin J.
通讯作者：
Hogan, Robin J.