摘要
【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。
【Objective】To study the changes in the concentrations and pattern of changes in acidity,inorganic nitrogen,SO_(4)^(2-),other anions and cations in wet deposition in the Pearl River Estuary from 2000—2016,and clarify the pollution status of dissolved inorganic ions such as nitrogen(N)and sulfur(S)in the atmosphere of the Pearl River Estuary.【Methods】Data of wet deposition in the Pearl River Estuary from 2000—2016 using the East Asian acid deposition monitoring network to analyze their concentration characteristics and long-term changes.【Results】The concentrations of NO_3^(-),NH_4^(+)and SO_(4)^(2-)decreased significantly after the implementation of the national pollutant control measures in 2001—2006.However,in 2007—2016,the concentrations of NO_3^(-)and NH_4^(+)increased slowly,while the concentration of SO_(4)^(2-)did not change significantly.The pH value fluctuated greatly from 2000 to 2005,and showed an overall upward trend from 2006 to 2016,but it was still lower than the acid rain value(pH<5.6);the change of rainfall acidity was not only affected by the local pollutant emissions,but also affected by the air pollutant emissions in Guangdong Province.The deposition fluxes of SO_(4)^(2-),NH_4^(+),NO_3^(-),Ca^(2+)and Cl^(-)decreased from 2000—2006,but the overall fluctuation increased 2007—2016.Anthropogenic sources were the main factors for the increase of deposition fluxes of N,S and Cl.Compared with other regions,N and S deposition fluxes are higher than other coastal areas in the South China Sea,but lower than those in other urban areas in southern China.【Conclusion】With the increasing of N,S and Cl deposition fluxes,the acidification of rainwater in the Pearl River Estuary may aggravate and further damage the ecosystem.Therefore,it is necessary to strengthen the regulation of N,S and Cl discharge.
作者
吴俊晖
劳齐斌
曾珍
周欣
骆惠洁
陈法锦
WU Jun-hui;LAO Qi-bin;ZENG Zhen;ZHOU Xin;LUO Hui-jie;CHEN Fa-jin(College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang 524088,China;Marine Environmental Monitoring Centre of Beihai,State Oceanic Administration,Beihai 536000,China;College of fisheries,Guangdong Ocean University,Zhanjiang 524088,China)
出处
《广东海洋大学学报》
CAS
北大核心
2021年第3期60-66,共7页
Journal of Guangdong Ocean University
基金
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)。
关键词
珠江口
湿沉降
沉降通量
PH值
酸雨
Pearl River Estuary
wet deposition
deposition flux
pH
acid rain
