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Wind events in a subtropical coastal upwelling region as detected by admittance analysis
Ocean Dynamics ( IF 2.2 ) Pub Date : 2021-03-13 , DOI: 10.1007/s10236-021-01446-z
Heriberto J. Vazquez , Jose Gomez-Valdes

Wind dominates the ocean surface circulation in the subtropical coastal upwelling regions. Although the wind events in these regions are mostly favorable for upwelling, other types of wind events are occasionally dominant. The typical patterns and statistics of wind events over the waters off northern Baja California are described. The identification of wind events was carried out using a systematic technique based on both the admittance magnitude and phase. This technique proved useful and has some of the crucial characteristics expected from a classification standpoint. This technique is applied to 29 years (1990–2018) of cross-calibrated multiplatform (CCMP) 10-m wind data. Equatorward along the coast (upwelling-favorable), offshore (Santa Ana), onshore, poleward along the coast (downwelling-favorable), and relaxation events are identified. The wind stress and wind stress curl mean fields and the statistics of occurrence are described on a year-to-year and month-to-month basis for each wind type. The upwelling-favorable and relaxation events are the most frequent and occur throughout the year; the typical duration is 4 and 1.5 days, respectively. The offshore (Santa Ana), onshore, and poleward wind events are sporadic and occur only during autumn-winter. The year-to-year variation of the frequency of occurrence of the equatorward wind events shows no trend during the study period.



中文翻译:

通过导纳分析检测到的亚热带沿海上升流地区的风事件

在亚热带沿海上升流地区,风主导着海洋表面的循环。尽管这些地区的风事件最有利于上升流,但其他类型的风事件偶尔还是占主导地位。描述了北下加利福尼亚州海域上风事件的典型模式和统计数据。使用基于导纳幅度和相位的系统技术对风事件进行识别。该技术被证明是有用的,并且从分类的角度来看具有某些关键特性。这项技术适用于29年(1990年至2018年)的交叉校准多平台(CCMP)10米风速数据。确定了沿海岸的赤道(有利于上升),近海的赤道(圣安娜),陆上,沿海岸的赤道(有利于下降)和松弛事件。每种风类型的逐年和逐月描述了风应力和风应力卷曲平均场以及发生的统计数据。上涌有利和松弛事件是最常发生的事件,全年发生。典型的持续时间分别为4天和1.5天。近海(Santa Ana),陆上和极风事件是零星的,仅在秋冬季发生。在研究期间,赤道风事件发生频率的逐年变化没有显示任何趋势。近海(Santa Ana),陆上和极风事件是零星的,仅在秋冬季发生。在研究期间,赤道风事件发生频率的逐年变化没有显示任何趋势。近海(Santa Ana),陆上和极风事件是零星的,仅在秋冬季发生。在研究期间,赤道风事件发生频率的逐年变化没有显示任何趋势。

更新日期:2021-03-15
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