大亚湾水温层化的季节性突变

大亚湾是粤东的一个山地溺谷湾,1987～1989年间我们采用锚碇AANDERAA自记仪器,在大亚湾近湾口处C_2、C_4两站(图1)分别进行了多层次逐时水温连续观测,两次记录了夏秋之交水温分层状态演变过程的时间序列,发现每年9月上、中旬大亚湾水温层化状态有一突变,从垂直分层过度到垂直均一状态,该过度过程历时短暂,仅数天时间。

SUDDEN CHANGE OF DAYA BAY TEMPERATURE STRATIFICATION IN'SEPTEMBER

Process of destratification during SW-NE monsoon transit was observed in Daya Bay, by moorings of temperature recorder. It was shown that seasonal destratification occurred rapidly in early September each year in Daya Bay. Within less than 10 d, the Bay suddenly changed its condition from highly vertical stratified into homogeneous. The process is accompanied by increase of water heat content. It is suggested that advection of upper layer warm water from the open shelf during monsoon transit may be responsable for this sudden change.