Chaos Excitation and Stochastic Synchronization in an Oceanic Double Gyre
Chaos Excitation and Stochastic Synchronization in an Oceanic Double Gyre
复制标题
海洋双环流中的混沌激励和随机同步
DOI：
10.11345/nctam.64.15
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
T. Matsuura
中科院分区：
文献类型：
--
作者：
S. Shimokawa;T. Matsuura
随机同步是同步和随机共振的耦合现象，被认为与有序结构的形成有关，如在包括海洋系统在内的非线性系统中观察到的节律调整。为了研究海洋双涡旋中的混沌激发及其与随机同步的关系，利用1.5层约化重力准地转模式，在季节变化强迫和红噪声驱动下进行了数值模拟。结果表明，在外加强迫条件下，当外加强迫幅值较小时，系统发生同步（即随机同步）;当外加强迫幅值较大时，系统更快地过渡到混沌激发，符合Curry-York模型.
Stochastic synchronization, which is the coupling phenomena of synchronization and stochastic resonance, is considered to be related to formation of ordered structure, such as in the rhythm adjustment observed in non-linear systems including ocean system. To investigate chaos excitation and the relation of it to the stochastic synchronization in the oceanic double gyre, numerical simulations are conducted using 1.5 layer reduced gravity quasi-geostrophic model driven by seasonal changing forcing with red noise. Results show that by adding red noise to external forcing, synchronization (ie, stochastic synchronization) occurs when the amplitude of external forcing is smaller than that in the case without noise, and the transition to chaos excitation occurs more rapidly when the amplitude of external forcing is larger, corresponding to the Curry-York model.