Dynamics and Evolution of a Northern Meddy
Dynamics and Evolution of a Northern Meddy
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北方梅迪的动态和演化
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Alain Serpette
中科院分区：
文献类型：
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作者：
J. Paillet;B. Cann;X. Carton;Y. Morel;Alain Serpette
1997年4月，在西班牙西北角45°N，11°30′W附近海域发现了一个水藻。在18个月的时间里，我们用拉格朗日浮标和深水浮标对它进行了跟踪，并安排了几次巡航，以收集关于它的进一步水文和Lowered-ADCP测量结果。这颗名为Ulla的meddy是一个单芯透镜，在1000米深度附近的温度和盐度最大值分别为11.5°C和36.17 psu，与其环境相比，其异常值超过2.5°C和0.5 psu。其自转频率接近每5天1圈。最大方位角速度在15-20 cm s−1附近达到15 km半径。漩涡有着广泛的远程影响，特别是到表面，并与大约10 Sv的总方位体积传输（Sv = 106 m3 s−1）有关，其中大约2 Sv被困在核心中。1997年8月，辐射状结构明显扩大，深度减少。Meddy Ulla在大多数时间内都是显著椭圆形的，并且根据时期，主要的椭圆形。
Abstract A meddy was discovered in April 1997 off the northwestern corner of Spain, near 45°N, 11°30′W. It was tracked during 18 months with Lagrangian floats and deep drogued buoys, and several cruises were set to collect further hydrological and Lowered-ADCP measurements on it. The meddy, named Ulla, was a one-core lens with maximum values of temperature and salinity of 11.5°C and 36.17 psu near 1000-m depth, yielding anomalies above 2.5°C and 0.5 psu compared to its environment. Its rotation frequency was close to 1 loop every 5 days. The maximum azimuthal velocities of 15–20 cm s−1 were reached near a 15-km radius. The meddy had a wide remote influence, notably up to the surface, and was associated with a total azimuthal volume transport of around 10 Sv, (Sv = 106 m3 s−1), of which around 2 Sv was trapped in the core. A widening of the radial structure with decreasing depth was notable in August 1997. Meddy Ulla was significantly elliptic for most of the time and, depending on the periods, the main el...