摘要
了解元素的地球化学特征，运用改进了湿度计算方法的Williams干沉降模型和同步观测的气象数据，计算了不同粒径气溶胶粒子在青岛海区海水表面的干沉降速率。并结合实验测定的舢，Fe，Mn，Cu，Pb，Zn6种金属元素的平均浓度，估算了它们从2001年5月-2002年4月在仰口（1#）、八关山（2#）和沧口（3#）3个采样点的每月和全年干沉降通量。结果显示，地壳元素舢，Fe，Mn在春、冬季对海域的输入量较大，而人为元素Cu，Pb，Zn则在秋、冬季较高。总悬浮颗粒物和这6种金属元素的干沉降通量在空间上的分布特征为：3#〉2#〉1#。PM10（空气动力学粒径〈10μm的颗粒）颗粒物的干沉降通量远低于TSP（总悬浮颗粒物），仅占TSP干沉降通量的6．6％。PM10与TSP中6种金属元素的浓度比和干沉降通量比表明，Cu，Pb，Zn更容易分布在PM10颗粒物上。除Pb外，PM10及PM10颗粒物中Al，Fe，Mn，Cu，Zn干沉降通量的月际变化和TSP基本一致。
Size-dependent particle dry deposition velocities were obtained by using the improved Williams＇ model, with the observed meteorological inputs. According to the averages of measured concentrations of Al, Fe, Mn, Cu, Pb and Zn, the monthly and yearly dry deposition fluxes for one year, from May 2001 to April 2002 at three sites, Yangkou, Baguanshan and Cangkou in the Qingdao coastal region were calculated. The resuits showed that the deposition fluxes of TSP （total suspended particles） and crustal elements AI, Fe, Mn were higher in spring and winter, while the dry deposition fluxes of Cu, Pb and Zn were higher in autumn and winter. It is also shown that the dry deposition fluxes of TSP, A1, Fe and Mn reduced in the order of Cangkou 〉 Baguanshan 〉 Yangkou. The dry deposition flux of PM10 （particles with aerodynamic diameters less than 10μm） was lower than that of TSP and accounted for 6.6 % of the TSP flux. The yearly average atmospheric concentration ratios and dry deposition flux ratios of the six metal elements in PM10 to those in TSP were calculated and the results showed that Cu, Pb and Zn are liable to be distributed on PM10 aerosol particles. Except for Pb, the variation of monthly dry deposition fluxes for PM10 particles and the other five elements in PM10 is similar to that of TSP.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第3期461-467,共7页
Periodical of Ocean University of China
基金
国家自然科学基金项目(40490262
40506006)资助
