0 引言
1 数据和方法
1.1 潜标观测数据
1.2 台风信息和卫星资料
1.3 方法
2 结果与分析
2.1 近惯性波及其频率“蓝移”
2.2 涡度和多普勒效应
图5 台风期间观测站位背景海流东西分量(a)和南北分量(b)的分布(竖直黑色虚线标出计算台风影响时间范围,紫色三角形表示台风到达时间。) Fig.5 Distribution of eastward (a) and northward (b) components of the background current at the mooring station during typhoon period (The vertical black dashed lines mark the time range of typhoons impact. The purple triangle indicates the arrival time of the typhoon.) |
图7 近惯性波引起的密度扰动与东西向流速剪切的相干谱(a)和相位谱(b)(黑色虚线表示当地惯性频率。) Fig.7 Squared coherence (a) and phase (b) between density perturbation and shear in eastward component (The black dashed lines indicate the position of f0.) |
图9 近惯性波有效科氏频率与固有频率(a)和背景流引起的多普勒频移(b)在垂直方向的分布(阴影代表置信区间。) Fig.9 Vertical distribution of the effective Coriolis frequency and intrinsic frequency of near-inertial waves (a) and Doppler shift of the waves induced by background current(b) (The shaded areas represent confidence interval.) |