吴俊晖,劳齐斌,曾珍,周欣,骆惠洁,陈法锦

• 1:广东海洋大学海洋与气象学院
• 2:国家海洋局北海海洋环境监测中心站
• 3:广东海洋大学水产学院

摘要(Abstract)：

【目的】研究珠江口2000—2016年湿沉降的酸度、无机氮、SO_4~(2-)及其他离子的浓度变化和发展趋势,阐明珠江口大气氮(N)、硫(S)等溶解性无机离子的污染状况。【方法】利用东亚酸沉降监测网2000—2016年珠江口湿沉降浓度数据,分析其化学特征和长期变化趋势。【结果】2001—2006年,珠江口雨水中的铵根(NH_4~+)、硝酸根(NO_3~-)和硫酸根(SO_4~(2-))浓度波动下降;2007—2016年,NO_3~-和NH_4~+浓度总体缓慢波动上升,SO_4~(2-)浓度无明显变化。pH值在2000—2005年波动变化较大,2006—2016年总体呈上升趋势,但仍低于酸雨值(pH <5.6);降雨酸度变化不仅受当地污染物排放的影响,同时也受到广东省内大气污染物排放的影响。SO_4~(2-)、NH_4~+、NO_3~-、钙离子(Ca~(2+))和氯离子(Cl~-)的沉降通量在2000—2006年间呈下降趋势,2007—2016年总体波动上升,人为来源是N、S和Cl沉降通量升高的主要因素。与其他区域相比,N和S沉降通量高于南海其他近岸区域,但低于中国南方其他城市区域。【结论】N、S和Cl沉降通量的不断升高,会使珠江口雨水酸化加重,进一步危害其生态系统,需要加强对N、S和Cl排放的管控。

关键词(KeyWords)： 珠江口;湿沉降;沉降通量;pH值;酸雨

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41476066);; 广西自然科学基金(2020GXNSFBA297065);; 广东省自然科学基金(2016A030312004)

作者(Author): 吴俊晖,劳齐斌,曾珍,周欣,骆惠洁,陈法锦

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