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首页> 外文期刊>Dynamics of Atmospheres and Oceans >'Santa Ana' winds and up welling filaments off Northern Baja California
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'Santa Ana' winds and up welling filaments off Northern Baja California

机译：圣安娜（Santa Ana）蜿蜒而出

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摘要

An atmospheric condition known as a 'Santa Ana' wind occurred from 9 to 11 February 2002. Its effect was felt over a large portion of southern California and the northern half of the Baja California Peninsula. Santa Ana winds are dry, strong northwesterly through easterly mountain downslope winds, most common in winter. Satellite data from Quickscat show two large wind jets crossing the mountains of the peninsula and extending 300 km offshore. Data from a coastal station reveal that the event lasted over 52 h with average speeds of 11 m s~(-1) and gusts of 25 m s~(-1). The southernmost jet crosses the mountains at the San Matias mountain pass and generates a cold filament off Point Colonel. Satellite imagery shows this feature lasting at least two iner-tial periods (T_i = 22 h) and extending 100km offshore during the observation period. Estimates of the stationary Ekman pumping produced vertical speeds of 20m per day, consistent in time and location with the observed structures. The ocean off Point Colonel is well known for the existence of upwelling episodes. They occur mostly in the spring or early summer when persistent winds blow towards the equator and parallel to the coast. The events described here present a different phenomenon: upwelling filaments induced by short-lived, offshore winter winds.
机译：2002年2月9日至11日发生了一种称为“圣安娜”风的大气状况。在南加州的大部分地区和下加利福尼亚半岛的北半部都感受到了这种影响。圣安娜（Santa Ana）风是干燥的，通过东风山下坡风向西北偏强，冬季最常见。来自Quickscat的卫星数据显示，有两架大型喷气式飞机越过半岛的山脉，并向海上延伸了300公里。沿海站的数据显示，该事件持续了52小时，平均速度为11 m s〜（-1），阵风为25 m s〜（-1）。最南端的喷气式飞机在圣马蒂亚斯（San Matias）的山口越过山脉，并在波因特上校（Point Colonel）上产生冷丝。卫星图像显示该特征至少持续两个惯性周期（T_i = 22 h），并在观测期内延伸到近海100 km。估算的固定Ekman抽水产生的垂直速度为每天20m，在时间和位置上与观察到的结构一致。波因特上校附近的海洋以上升流事件的存在而闻名。它们主要发生在春季或初夏，持续风吹向赤道并平行于海岸。这里描述的事件呈现出不同的现象：由短寿命的海上冬季风引起的上升丝。

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