台风“碧利斯”在厦门海域的酸沉降特征及其氮、磷营养盐对海洋的输入评估

Acid deposition characteristics of rainwater and inputs of inorganic nitrogen and phosphorus into the sea waters near Xiamen area during typhoon Bilis

通过对台风"碧利斯"影响期间厦门滨海地区降雨化学特征的研究,以及对台风降雨与春夏季降雨样品的比较研究发现:主要离子降雨的月沉降通量根据其特点可分为4类.台风降雨的pH明显大于非台风降雨,台风"碧利斯"和"格美"降雨样品的pH不具有酸雨特征.台风"碧利斯"的降雨能有效清除空气中的酸雨成分,同时减少对厦门滨海地区的酸沉降和对海洋的酸输入.春夏季降雨和台风降雨的N/P比都远高于海水Redfield值.通过估算发现台风"碧利斯"的直接湿沉降对台湾海峡西部表层海水D IN(溶解无机氮)有很大的增加,而PO43-的输入量则很小.

Rain samples collected from the shore of Xiamen during the impact of typhoon Bilis were analyzed. The results showed that monthly mean deposition of major ions in rain could be classified into 4 groups, pH in typhoon rain was significantly higher than that in normal rain and pH in typhoon rain showed less acidity characteristics. Acid composition in air could have been cleaned out effectively by rain during typhoon Bilis. The rain reduced acid deposition into the shore of Xiamen and its adjacent sea area at the same time. N/P ratios of rain in spring and summer seasons and from typhoon Bilis were much larger than the Redfield ratio. DIN in surface water of western Taiwan Strait was significantly increased by wet deposition during typhoon Bilis, but PO4^3- in this area increased insignificantly.