First Observed Temporal Development of a Noctilucent Cloud Ice Void
First Observed Temporal Development of a Noctilucent Cloud Ice Void
复制标题
首次观察到夜光云冰空的时间发展
DOI：
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发表时间：
2018
影响因子：
5.2
通讯作者：
M. Taylor
中科院分区：
文献类型：
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作者：
L. Megner;J. Stegman;P. Pautet;M. Taylor
夜光云是出现在夏季极地中层顶周围的薄冰云。最近，AIM卫星上的云成像和粒子大小仪器发现了云内几乎圆形的无冰区域，称为“冰空洞”。这些冰洞的起源尚不清楚。到目前为止，它们的存在只被云成像和粒子大小报道，它们只能提供非常有限的时间尺度信息。2010年7月4日，我们的地面相机以30秒的时间间隔拍摄了这样一个冰空。因此，我们在这里提出的第一个完整的时间发展的冰空。令人惊讶的是，空洞并没有像周围的云一样随着盛行风漂移，而是在大约1小时的时间里保持着明显的静止。这表明它的起源是静止的，而不是当地大气的快速变化。
Noctilucent clouds are thin ice clouds that appear around the summer polar mesopause. Recently, the Cloud Imaging and Particle Size instrument on the AIM satellite discovered nearly circular ice free regions within the clouds—denoted as “ice voids.” The origin of these ice voids is not known. Their existence has so far only been reported by Cloud Imaging and Particle Size, which only can give very limited information of the time scales involved. On 4 July 2010, such an ice void was registered by our ground‐based camera taking images with 30‐s time interval. We thus here present the first full temporal development of an ice void. Surprisingly, the void did not drift with the prevailing wind as cloud features around it, but instead remained notably stationary for its entire existence of approximately 1 hr. This indicates that that the origin is of stationary character, rather than a rapid change of the local atmosphere.