美國大峽谷現大片雲海

過去要數年才出現一次的美國大峽谷雲海，近年越見頻繁，前日再度出現，是六個星期內第二次。美國國家公園管理局發佈一段延時攝影片段，將大峽谷的雲海變幻攝入鏡中。

該延時片段攝於前日（28日），將現實世界的30分鐘濃縮成片中的1分鐘，可清晰看到雲朵流動的軌跡。

「逆溫雲」（cloud inversion），一層暖空氣壓住谷底的冷空氣，加上河谷濕度偏高，遂結成雲霧。

雲海令大峽谷南緣的軍艦岩，尤如真正航於海上。

 

Today, visitors to the #GrandCanyon National Park (@grandcanyonnps) in #Arizona got to see this stunning sight. This #weather phenomenon is called a total cloud inversion, and it happens when the air near the ground is cooler than the air above it, creating a sea of clouds. While typically a rare event, this is the second cloud inversion at the Grand Canyon in six weeks. Pictured here is the #SouthRim's "Battleship," which truly looked like a ship today, cutting through the waves. Photo by M. Quinn, #NationalPark Service.

A photo posted by U.S. Department of the Interior (@usinterior) on

Jan 28, 2015 at 3:48pm PST