Copyright:
Witta Priester
原文:
What kind of clouds are these? Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not appear to be harbingers of meteorological doom. Known informally as Undulatus asperatus clouds, they can be stunning in appearance, unusual in occurrence, are relatively unstudied, and have even been suggested as a new type of cloud. Whereas most low cloud decks are flat bottomed, asperatus clouds appear to have significant vertical structure underneath. Speculation therefore holds that asperatus clouds might be related to lenticular clouds that form near mountains, or mammatus clouds associated with thunderstorms, or perhaps a foehn wind — a type of dry downward wind that flows off mountains. Such a wind called the Canterbury arch streams toward the east coast of New Zealand’s South Island. The featured image, taken above Hanmer Springs in Canterbury, New Zealand, in 2005, shows great detail partly because sunlight illuminates the undulating clouds from the side. Follow APOD on: Facebook, Google Plus, Instagram, or Twitter
中文翻譯:
🌥️ 雲層探索：這些雲是什麼？雖然它們的形成原因目前尚不明，但這些不尋常的氣象結構，看起來雖然令人毛骨悚然，但並不代表著氣象災難的來臨。這種雲被非正式地稱為 Undulatus asperatus 雲，外觀驚艷、出現稀少、研究仍然有限，甚至被提議為一種新雲類。不同於大多數低雲層扁平的底部，asperatus 雲在底部呈現出顯著的垂直結構。有人推測，asperatus 雲可能與形成於山區的 Lenticular 雲、與雷暴相關的 Mammatus 雲，或是乾燥的下沉風（如 Foehn 風）有關。這種名為 Canterbury arch 的風向著新西蘭南島的東海岸吹去。上面這張圖片是於2005年在新西蘭的漢默溫泉拍攝的，因為側光照亮了這些起伏的雲層，顯示出驚人的細節。
#UndulatusAsperatus #雲層 #氣象現象 #新西蘭 #自然之美 #雲的奧秘 #科學探索 #漢默溫泉
來源:NASA每日圖片
