中国近海陆架区域的中尺度涡旋
运动路径研究
摘要
基于1993-2017年卫星高度计海面高度异常中尺度涡追踪数据集，对到达中国近海陆架区两个研究区域--东海陆架区及南海北部陆架区中尺度涡进行路径分类、季节变化及物理特征参量的统计分析，并结合实测再分析流场资料，分析对应的背景速度场、背景涡度场。研究结果显示，近25年，在东海追踪到318个气旋涡、276个反气旋涡。根据中尺度涡运动路径将其分为：浅海生成往深海传播型（148个）、深海生成向浅海传播型（35个）、沿等深线方向运动型（180个）、徘徊型（121个）、外来入侵到达东海陆架型（25个）及外来入侵到达东海深海型（85个）。上述6个类型中尺度涡存在明显季节分布。其中，浅海生成往深海传播型在春、冬季节数量较多，与徘徊型在季节分布上相反。沿等深线方向运动型涡旋在春、夏季节数量较多，与外来入侵到达东海深海型涡旋的季节分布特征相反。徘徊型中尺度涡的平均生存时间最长，约为44天。外来入侵到达东海陆架型的中尺度涡具有最大的平均振幅及直径，分别为13.2 cm、122 km。外来入侵到达东海深海型涡旋的生命周期、振幅、直径在数值上均为最小。除浅海生成往深海运动涡旋传播速度呈先快后慢趋势外，其他类型中尺度涡的振幅、半径在生命周期上的归一化特征呈现出同步变化的趋势，传播速度呈先慢后快趋势，自太平洋生成传播到东海的中尺度涡旋转速
度大于其他类型的中尺度涡。背景流场、涡度场结果显示，琉球群岛东、西两侧常年存在正、负涡度分布，中尺度涡运动路径受到背景场影响。
在南海北部陆架区，25年间共存在184个中尺度涡旋入侵南海北部陆架或在陆架内部生成。根据涡旋运动轨迹，我们将其分为四种类型，即沿等深线运动型，径直入侵型，局地徘徊型和陆架内部生成类型。这四种类型涡旋数量分别为87、38、23和36个。沿等深线运动型涡旋的平均振幅和直径最大，分别约为18 cm和153 km。此外，沿等深线运动型中尺度涡的平均生命周期也最长(93天)。陆架内部生成型涡旋的平均振幅，直径和生命周期最小，分别约为16 cm，146 km和74天。南海北部陆架四类运动路径的中尺度涡中，除径直入侵型涡旋振幅变化剧烈外，其余三个类型涡旋振幅、半径呈现出同步变化的趋势。除陆架内部生成型外，其余三个类型中尺度涡传播速度呈现出先慢后快的变化趋势。两个研究区域中尺度涡在陆架上的传播速度均大于深海中的传播速度。与东海陆架区相同的是，南海北部陆架中尺度涡运动路径同样也受到背景流场流速、流向的影响中。同时，中尺度涡数量的季节分布也与相应的背
景流场流速和方向有关。
中尺度涡在进入陆架区，特别是入侵到陆架浅海区，中尺度涡旋由于地边界摩擦、海水环境变化会造成中尺度涡旋的衰变、耗散。利用前人提出的海洋中尺度涡衰变解析模式，验证中国近海陆架区域中尺度涡旋入侵陆架浅海的中尺度涡涡度的解析模式。
关键词：中国近海陆架，中尺度涡，运动路径，统计特征安全检查报告
Analysis of mesoscale eddies entering the continental
shelf of the China offshore area
Abstract
An Archiving Validation and Interpretation of Satellite Oceanographic (A VISO) satellite altimeter a level anomaly meso-scale eddy tracking data t during the period from 1993 through 2017 is ud to classify the meso-scale eddies in the East China Sea (ECS) according to the path. The results show that 318 cyclones and 276 anticyclones are detected in the ECS during the 25-year period. The meso-scale eddies are classified into the following types according to the path: (1) eddy generated in shallow a intrudes into deep a type (148 cas), (2) eddy generated in deep a intrudes into shallow a type (35 cas), (3) eddy spreads along the isobath type (180 cas), (4) eddy wanders around type (121 cas), (5) eddy generated in Pacific Ocean intrudes into the shelf area of the ECS type (25 cas) and (6) eddy generated in Pacific Ocean intrudes into the ECS type (85 cas). The eddies have obvious asonal variability. The number of mesoscale eddies for type 1 in spring and winter is much more than that in summer and autumn. However, the temporal di
stribution for type 4 is in contrast to that for type 1. The number of eddies for type 3 in spring and summer is much more than that in autumn and winter. Contrary to that for type 3, the number of eddies for type 6 is small in spring and summer. The mean lifetime of eddies for type 3 is longest, about 44 days. The mean amplitude and diameter of eddies for type 5 is largest, about 13.2 cm and 122 km. The mean lifetime, amplitude and diameter of eddies for type 6 is smallest. In addition to the eddies propagation speed from shallow a to deep a, the normalized characteristics of the amplitude and radius of other types of mesoscale vortices in the lifetime show a synchronous change trend, and the propagation speed of the other types is slow first and then fast. The trend is that the rotation speed of the eddies generated from the Pacific Ocean then propagating to the ECS is faster than other types of eddies. The positive and negative vortices is distributed on the east and west sides of the Ryukyu Islands. The motion path of the meso-scale eddies is impact by the background field.
There are 184 mesoscale eddies entered the continental shelf area of the northern SCS during 24-year period. According to motion trajectories, we classify the mesoscale eddies into four types, i.e. along the isobath type, intrusion of continental shelf type, local wandering type, and shelf internal generation type. The occurrence numbers of the four types were 87, 38, 23 and 36, respectively. The mean amplitude and radius of the along the
isobath type are the largest, about 18 cm and 153 km, respectively. Furthermore, their average lifetime is also longest, about 93 days. The mean amplitude, radius and lifetime are smallest for the shelf internal generation type, about 16 cm, 146 km and 74 days, respectively. The direction and velocity of the background flow field will affect the intrusion path of the mesoscale eddies to continental shelf of the northern SCS. The amplitude and radius of the other three types of eddies show a synchronous change except for the sharp changes in the amplitude of the intrusion of continental shelf type. Except for shelf internal generation type, the propagation speeds of the other three types of eddies show a trend of slowing first and then fast. The propagation speed of shelf internal generation type in both two rearch areas is greater than that in the deep ocean. At the same time, the asonal distribution of the mesoscale eddies quantity is also related to the direction and velocity of the corresponding background flow field.
After intruding over the continental shelf, mesoscale eddies will decay and dissipation becau the bottom boundary friction and marine environmental changes. Using the analytical model of ocean mesoscale eddies decay propod by the predecessors, the analytical model of mesoscale eddies entering the continental shelf of the China offshore area was verified.
Keywords: the continental shelf of the China offshore area, mesoscale eddies, motion path, statistica
l characteristics描写青春的诗句
王珪
消水肿的最快方法目录
摘要 ............................................................... I Abstract ......................................................... III 1绪论.. (1)
1.1 研究背景及意义 (1)
1.2 研究进展与现状 (1)
1.2.1 全球中尺度涡 (1)
1.2.2 中国近海中尺度涡 (3)
1.2.3 陆架中尺度涡 (5)
1.3 问题提出与研究内容 (6)
2 数据与方法： (7)厦门自由行攻略
2.1 数据来源及介绍 (7)
2.1.1中尺度涡追踪数据集 (7)
2.1.2地形数据 (7)
2.1.3 海面高度异常数据 (7)
内存拓展2.1.4 流速数据 (7)
2.2 计算方法及研究区域 (8)
白酒能上高铁吗2.2.1 背景涡度场的计算 (8)
2.2.2 研究区域选取范围及中尺度涡样本选定标准 (8)
3 东海陆架区中尺度涡统计特征 (10)
3.1东海陆架区中尺度涡年际、季节分布特征 (10)
3.2 东海陆架区各运动路径中尺度涡特征 (11)
3.2.1 东海陆架区涡旋运动路径分类及其特征 (11)
3.2.2 东海陆架区各类型涡旋的季节分布特征 (14)
3.2.3 东海陆架区各类型涡旋的物理参量统计特征 (16)
3.3 小结 (18)
4 南海北部陆架区中尺度涡统计特征 (19)
4.1南海北部陆架区中尺度涡年际、季节分布特征 (19)
4.2 南海北部陆架区各运动路径中尺度涡特征 (21)
4.2.1 南海北部陆架区涡旋运动路径分类 (21)
4.2.2 南海北部陆架区各类型涡旋的季节分布特征 (23)
4.2.3 南海北部陆架区各类型的物理参量统计特征 (24)
4.2.4 南海北部陆架区涡旋空间分布特征 (26)
4.3 小结 (27)
5 机制分析 (28)
5.1背景速度场和背景涡度场分析 (28)
5.1.1 东海陆架背景场分析 (28)冬天作文300字
5.1.2 南海北部陆架背景场分析 (29)
5.2 耗散过程分析 (30)
5.2.1 涡旋个例物理参量分析 (30)
5.2.2 涡旋耗散过程理论解析模式 (32)
5.2.3 中国近海陆架区涡旋耗散过程分析 (33)
