Evidence of time‐mean cyclonic cell southwest of Iberian Peninsula: The Mediterranean Outflow‐driven β‐plume?
Evidence of time‐mean cyclonic cell southwest of Iberian Peninsula: The Mediterranean Outflow‐driven β‐plume?
复制标题
伊比利亚半岛西南部时间平均气旋单元的证据：地中海外流驱动的β羽流？
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Teles
中科院分区：
文献类型：
--
作者：
L. Lamas;A. Peliz;I. Ambar;Ana Barbosa Aguiar;N. Maximenko;A. Teles
第一个观测证据的时间平均气旋再循环西南的伊比利亚。水文学，卫星测高和表面漂移速度的数据集进行了联合分析，以获得准确的时间平均环流在中纬度东北大西洋的加迪斯湾。在所有计算的速度场中检测到一个气旋再循环单元，其特征与理论和模拟研究预测的特征相似。上1000 m层的细胞表现出3至4 Sv的输运，仅略小于模型输运。该环流中心位于36°N，10°W附近，带状拉长，向西延伸至15°W。风驱动的Sverdrup输送和β-羽流动力学都被认为在气旋的产生中发挥了作用，但这些影响的相对贡献尚未得到澄清。再循环的核心出现紧凑和细胞的大小向西褪色的速度比所考虑的理论和建模研究预测的要快得多。
First observational evidence of time‐mean cyclonic recirculation southwest of Iberia is presented. Data sets of hydrography, satellite altimetry and surface drifters velocities are analyzed jointly in order to obtain an accurate time‐averaged circulation in the mid‐latitude northeast Atlantic off the Gulf of Cadiz. A cyclonic recirculation cell with characteristics similar to those predicted by theoretical and modeling studies is detected in all computed velocity fields. The cell in the upper 1000‐m layer exhibits transports of 3 to 4 Sv that are only slightly smaller than the model transports. The cell is centered at approximately 36°N, 10°W, is elongated zonally and extends to 15°W westwards. Wind driven Sverdrup transport and β‐plume dynamics are both suggested to play a role in the generation of the cyclonic cell, but the relative contribution of these effects is yet to be clarified. The core of the recirculation appears compact and the magnitude of the cell fades westwards much faster than predicted by the theoretical and modeling studies considered.