湄洲湾中部水体石油类含量分布特征及其年际变化趋势

于2006～2008年间2次对湄洲湾中部海域水体中石油类含量进行了调查,发现2006年该海域水体石油类含量为9.27～78.91μg/dm^3,平均含量为28.12μg/dm^3;2008年湄洲湾中部海水石油类含量为8.36～23.34μg/dm^3,平均含量为15.10μg/dm^3.在垂直方向上,其石油类含量的分布较为复杂,不过大体呈现出表层低、底层高的特征.结合前人的调查结果,得出1992～2008年湄洲湾中部海域水体中石油类含量的年际变化趋势虽时有波动,但总体较为平稳.1997年湄洲湾水体中石油类的平均含量为23.70μg/dm^3,而近几年对该湾的调查结果与10a前的比无太大增高.这可能是湄洲湾良好的水体交换条件所造成的.

Distribution characteristics and interannual variation trend of the content of petroleum hydrocarbons in the central part of Meizhou Bay

Two investigations were conducted to evaluate the content of petroleum hydrocarbons in the central part of Meizhou Bay in 2006 and 2008.The 2006 investigation found the content to be 9.27～78.91μg/dm^3,with an average content of 28.12 μg/dm^3.The 2008 investigation found the content to be 8.36～23.34μg/dm^3,with an average content of 15.10μg/dm^3.Additionally,the vertical distribution of petroleum hydrocarbon concentrations was rather complex,but generally lower in the surface layer and higher in the bottom layer.The results of the present study combined with those of previous studies indicate that,although the petroleum hydrocarbons content fluctuated annually from 1992 to 2008,overall it was stable.In 1997,the average content of petroleum hydrocarbons in Meizhou Bay was 23.70 μg/dm^3,and a recent survey did not show a significant increase.This was likely due to effective water exchange in Meizhou Bay.