摘要
根据东海30°N断面1976—2013年历年2月份表、底层温度、盐度资料,采用经验正交函数(EOF)、谱分析等方法分析了断面温盐的空间分布特征和时间变化特征。结果表明:断面温度空间变化趋势可分为西段和东段,盐度变化可分为西段、中段和东段;表层温度第一模态呈现准平衡趋势且近海比外海温度变化幅度大,底层温度第一模态呈现下降趋势;表层盐度有降低趋势且近海比外海降低趋势大,底层盐度在近年来表现出降低趋势。该断面水温年际变化和El Nio关系密切;盐度短期震荡和El Nio有关系,而长期变化与PDO有关。
Spatial distributions and time variation characteristics were analyzed using EOF and spectrum analysis methods using surface and bottom temperature and salinity data in February of 1976—2013along30°N section in the East China Sea.Result showed that temperature trends can be divided into western part and east part,salinity trend divided into western,middle and eastern part.The first mode of surface temperature presented a quasi-equilibrium trend and the range was higher in the near-shore than the offshores,first mode of bottom temperature presented a decreasing trend;surface salinity had a decreasing trend and the extent was higher in the near-shore than the offshores,the bottom salinity showed a decreasing trend in recent years.The temperature inter-annual variability related to El Nino closely;short-term shocks of salinity related to El Nino,and long-term changes had something to do with PDO.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第6期1-7,共7页
Periodical of Ocean University of China
基金
海洋公益性行业科研专项(基于数字海洋的资料整合及其共享服务应用示范)子任务:海洋水体环境资料整合处理技术研究与产品研制(201305029-01)资助~~
关键词
东海
断面
温盐
EOF
谱分析
East China Sea
section
temperature and salinity
EOF
spectral analysis method
