1945-2010年台湾东北海域温盐变化的时空分异

发布时间：2018-05-23 11:24

本文选题：台湾东北海域 + 黑潮　；参考：《上海师范大学》2015年硕士论文

【摘要】：台湾东北海域地跨亚热带、热带,位于台湾岛与琉球群岛之间。黑潮携带着大量高温高盐水跨过宜兰海脊,流经此海域向北流动进入东海,并有琉球海流和北赤道暖流经此区域。在IPCC指出全球700m以浅的海水温度都上升的环境下,海底地形复杂又有洋流流经的此区域海,海水温、盐水文特征的变化趋势如何是本文的研究重点。本文采用Ishii1945-2010年再分析资料,使用matlab提取台湾东北海域数据点以及典型(A、B)断面的12个月逐年0-700m层的温度、盐度资料,采取切片分析、聚类分析、分段线性分析等方法,探讨台湾东北海域温度、盐度结构的月份、季节、年际变化过程、长期趋势、区域差异以及影响因素,进一步了解黑潮对我国气候变化的影响,为气候预测提供重要依据。探讨台湾东北海域温度、盐度结构的月份、季节、年际变化过程、长期趋势、区域差异以及影响因素,进一步了解黑潮对我国气候变化的影响,为气候预测提供重要依据。对研究结果分析,得出以下主要结论:1、1945-2010年间台湾东北部海域0-700m深的海水温度年际变化(1)在深度上:表现出上层海水温度增加,中下层出现增温平缓下降趋势,400-700m层出现水温下降的趋势。(2)在季节上:春夏季节海水增温的深度比秋冬季节的深度深;从表层的海水温度变化规律可以看出,冬季表层温度上升幅度较夏季大,春秋两季的上升幅度在夏冬之间。2、1945-2010年间台湾东北部海域海水温度年际变化的区域差异(1)在深度上:表层(0-100m)的温度主要受纬度位置的影响,中层(100-300m)的温度主要受洋流带来的热量影响,深层(300-700m)的温度主要受地形的影响。(2)在位置上:东海黑潮内部的点,东海黑潮入口附近的点,北太平洋内部的点,呈现为增暖层变浅的趋势。3、1945-2010年间台湾东北部海域海水盐度的年际变化规律(1)在深度上:海水盐度的最大值出现在150-200m的深度,表层盐度值较小,100-300m层海水盐度值较大,300-700m海水盐度值又逐渐减小。(2)分段分析:A、B两断面海水盐度的年际变化总体表现为下降的趋势,分段后发现1945-1962期间是盐度上升;1994-2010期间是急速下降的。1963-1993期间则表现出年际变化的整体趋势不明显,出现小幅度上升或下降的趋势,但极值出现较多,年际之间波动较大。(3)在季节上:秋、冬季节在盐度上升或下降的幅度上都较春、夏季节大;在1963-1993波动平缓期间则表现出春秋季节盐度小幅度增加,而夏冬季节盐度小幅度下降的趋势。4、台湾东北海域海水盐度年际变化的影响因素(1)表层50m以浅的海水出现低盐情况,多是因为受到降水和大陆径流的影响。(2)海水盐分较高的情况多是受到洋流影响,这里主要是黑潮流经带来高盐水上涌,以及东部高盐海水西侵的影响。
[Abstract]:Northeast Taiwan lies between Taiwan Island and Ryukyu Islands. The Kuroshio carries a large amount of high temperature and high salt water across the Ilan ridge and flows northward into the East China Sea through which the Ryukyu current and the North Equator warm current flow through the region. Under the condition that the sea temperature is rising in shallow sea water at 700m in the world, the research focus of this paper is how to change the characteristics of sea surface, sea water temperature and brine in this area, where the sea surface topography is complex and ocean currents flow. In this paper, the annual reanalysis data of Ishii1945-2010 and the temperature and salinity data of 0-700m layer in 12 months from the data points of northeast Taiwan sea area and the typical Ishii1945-2010 section are extracted by matlab. The methods of slice analysis, cluster analysis and piecewise linear analysis are adopted in this paper. This paper probes into the month, season, interannual variation process, long term trend, regional difference and influencing factors of temperature, salinity structure in northeast Taiwan, and further understands the influence of Kuroshio on climate change in China, which provides important basis for climate prediction. This paper probes into the month, season, interannual variation process, long term trend, regional difference and influencing factors of temperature, salinity structure in northeast Taiwan, and further understands the influence of Kuroshio on climate change in China, which provides important basis for climate prediction. Based on the analysis of the results of the study, the following main conclusions can be drawn: (1) the annual variation of seawater temperature from 0 to 700 m deep in northeastern Taiwan during 1945-2010) shows that the upper sea water temperature increases in depth. In the season, the depth of sea water temperature increase in spring and summer is deeper than that in autumn and winter, and the variation law of surface water temperature can be seen from the variation of surface water temperature. The increase of surface temperature in winter is larger than that in summer. The rise of sea water temperature in spring and autumn is mainly affected by latitude position. The regional difference of annual variation of sea water temperature in northeast Taiwan during 1945-2010 is as follows: the surface layer is 0-100m). The temperature of the middle layer is mainly affected by the heat from the ocean current, and the temperature of the deep layer is mainly affected by the topography. The temperature is mainly affected by the topography in the position: the point inside the Kuroshio in the East China Sea, the point near the Kuroshio entrance in the East China Sea, and the point in the North Pacific Ocean. The annual variation of seawater salinity in northeastern Taiwan from 1945-2010 shows a trend of shallower warming. (1) in depth, the maximum salinity of seawater appears at the depth of 150-200m, The salinity value of the surface layer is larger than that of the layer of 100-300m. The salinity value of 300-700m seawater decreases gradually. It was found that the salinity increased during 1945-1962 and decreased rapidly during 1994-2010. The overall trend of interannual variation was not obvious in the period of .1963-1993, and the trend of small increase or decrease appeared, but the extreme value appeared more. In the season, the increase or decrease of salinity in autumn and winter is larger than that in spring, and the salinity increases slightly in spring and autumn in 1963-1993. However, in summer and winter seasons, the salinity decreased slightly. 4. The influencing factors of the interannual variation of seawater salinity in northeast Taiwan were 1) the low salinity occurred in shallow sea water with a surface of 50 m. Most of them are influenced by precipitation and continental runoff. (2) the higher salt content in seawater is influenced by ocean current, which is mainly due to the upwelling of high salt water brought by Kuroshio tidal current and the westward transgression of high salt seawater in the east.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P731.1

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