Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau
Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau
复制标题
凯尔盖朗高原上游极锋的季节性蜿蜒
DOI：
10.1029/2018gl079614
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
D. Nerini
中科院分区：
文献类型：
--
作者：
Etienne Pauthenet;F. Roquet;G. Madec;C. Guinet;M. Hindell;C. R. McMahon;Robert Harcourt;D. Nerini
南极极锋（PF）的位置映射在南印度洋的温度和盐度剖面的形状分解成垂直模式，使用功能的主成分分析。我们将PF定义为地下温度的最北最低值，并将其表示为前三种模式的线性组合。这种方法适用于海洋再分析数据集和现场观测，揭示了季节性变化的PF纬度位置，是最明显的康拉德上升和Kerguelen高原之间。这种转变与穿越北方凯尔盖朗高原的运输变化相吻合。我们认为，上层分层的季节性变化可能会驱动所观察到的PF的变化，潜在的巨大影响的途径和停留时间的水团在高原和浮游植物水华延伸东南的凯尔盖朗群岛。
The location of the Antarctic Polar Front (PF) is mapped in the Southern Indian Ocean by decomposing the shape of temperature and salinity profiles into vertical modes using a functional Principal Component Analysis. We define the PF as the northernmost minimum of temperature at the subsurface and represent it as a linear combination of the first three modes. This method is applied on an ocean reanalysis data set and on in situ observations, revealing a seasonal variability of the PF latitudinal position that is most pronounced between the Conrad Rise and the Kerguelen Plateau. This shift coincides with variations in the transport across the Northern Kerguelen Plateau. We suggest that seasonal changes of the upper stratification may drive the observed variability of the PF, with potentially large implications for the pathways and residence time of water masses over the plateau and the phytoplankton bloom extending southeast of the Kerguelen Islands.