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[外文资料]卡特琳娜涡流

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更多 发布于:2013-03-10 22:56
acquired February 17, 2013download large image (3 MB, JPEG, 2625x3112)
acquired February 17, 2013download GeoTIFF file (13 MB, TIFF)
acquired February 17, 2013download animation (1 MB, QuickTime)

On February 17, 2013, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this natural-color image of an atmospheric eddy off the coast of Southern California. The swirling, circular pattern in the clouds was due west of San Diego when Terra flew over around local noon.
The pattern is known to meteorologists as a Catalina eddy, or coastal eddy, and it forms as upper-level flows interact with the rugged coastline and islands off of Southern California. The interaction of low- and high-pressure systems—with offshore winds blowing out of the north and coastal winds blowing out of the south—give the marine stratus clouds a cyclonic, counter-clockwise spin. The eddy is named for Santa Catalina Island, one of the Channel Islands offshore between Los Angeles and San Diego.
Catalina eddies can bring cooler weather, fog, and better air quality into Southern California as they push the marine boundary layer further inland. These mesoscale eddy patterns can stretch across 100 to 200 kilometers (60 to 120 miles) and can last from a few hours to a few days. They most often form between April and October, peaking in June.
A downloadable time-lapse video from the GOES-West weather satellite is linked below the image and shows the evolution of the eddy over roughly eight to ten hours. Images of the pattern in other wavelengths are available on the CIMSS Satellite Blog.

 
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帖子中涉及地图来源广泛,图中所涉及的行政区域以中国官方认定的为准。
Mahoshojo
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发布于:2014-08-19 00:32

2013年2月17日獲得影像下載 大圖 (3 MB, JPEG, 2625x3112)
2013年2月17日獲得影像下載 GeoTIFF 檔 (13 MB, TIFF)
2013年2月17日獲得影像下載 動畫 (1 MB, QuickTime)

這是一張由美國太空總署的Aqua衛星上搭載之中等解析度成像光譜儀(MODIS)於2013年2月17日在南加州海岸所拍攝到的大氣渦漩自然色彩影像。這種螺旋的曲線狀雲系乃是由於地形所致之流場於中午時流經聖地牙哥西方所致的。

氣象學家將這種雲狀特徵稱為卡塔莉娜渦流或海岸渦流,其成因乃是上層氣流與南加州海岸及島嶼地形交互作用所致-來自北方外海的風與來自南方的海岸風交會形成了高低壓系統交互作用,使海洋層雲以氣旋,逆時鐘方向旋轉。渦流名源自聖卡塔莉娜島:洛杉磯與聖地牙哥間的海峽群島之一。

卡塔莉娜渦流將海洋邊界層大氣往內陸推展時將可為南加州帶來涼爽的天氣及較好的空氣品質,這些中尺度渦漩雲系特徵可以橫跨100至200公里(60至120英里),並可以持續幾個小時到幾天。在四到十月為渦漩形成好發期,並於六月達最盛。

由地球同步環境衛星-西部天氣衛星所拍攝之可供下載縮時影片之連結位於圖下,並顯示渦流演變過程約在八至十小時,CIMSS衛星部落格提供其他波長的(該渦流)特徵影像。
[Mahoshojo于2014-08-19 12:15编辑了帖子]
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  • tcfa_gw
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    2014-08-19 09:00
(@゜▽゜@)ノ~~Mahoshojo=まほ しょうじょ=魔法少女 滴說
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