【摘要】 采用特征量和线性拟合的方法,对1976～2003年8月的B1断面温盐调查资料进行分析。结果表明:夏季渤海暖水深入沿岸两端及渤海中部,深水处具有南北2个冷水区,形成冷、暖水体并存的分布特征。渤海夏季温度场结构分布是多种海洋物理环境要素的综合影响所致,太阳辐射和地形是基本原因之一,北黄海冷水侵入是冷暖水区维持的重要原因。冷水区多年温度有正变化率,温度变化正距平的信号来自大气气候变暖;而渤海中部高温水体则具有负变化率,温度变化负距平的信号来自北黄海次表层温度的变化,可能与北黄海冷水侵入渤海有关。夏季近岸盐度低,底层盐度高。盐度多年变化以正变率为主,造成岸边盐度升值明显的主要原因是河流入海淡水量的减少和工业污染。更多还原

【Abstract】 Based on temperature and salinity observed along section B1 in August from 1976 to 2003,structure of temperature and salinity and their variations are analyzed by using the methods of characteristic index and linear regression analysis.Results showed that: 1) Temperature at the two ends of coast and middle part was high in surface layer along the section B1;Two cold center were located in south and north of this section separated by a warm part of water in the Bohai Sea.2) Cold centers showed positive rate in the sea temperature variation,affected by global climate warming;The warmer water in the central section B1 had negative variation trend,which come from the sea temperature variation of sub-surface layer in north yellow sea.3) Salinity at the ends of coast were low in sub-surface layer along section B1 and high central salinity structure existed in the bottom layer of the section.4) Salinity showed a positive rate in 30 years of late along section B1.The main reasons of salinity raise were the decrease of freshwater input from rivers and aggravating industrial pollution.更多还原