台湾海峡海表气溶胶干沉降通量研究

Dry deposition fluxes of aerosol particles to surface water in the Taiwan Strait

在已改进的Williams模型中,应用GW03海表动力学粗糙度参数化方案,考虑波浪对干沉降速率的影响,结合卫星资料和再分析资料,计算了台湾海峡海表气溶胶干沉降速率,并利用2006～2007年走航观测结果计算了台湾海峡总悬浮颗粒物的入海通量.其结果表明:台湾海峡海表气溶胶干沉降速率及总悬浮颗粒物干沉降通量具有明显的时空变化特征.台湾海峡海表气溶胶干沉降速率范围为5.83～6.17 cm/s,平均值为6.00 cm/s.其中冬季气溶胶干沉降速率最大,平均值为6.08 cm/s;夏季气溶胶干沉降速率最小,平均值为5.85 cm/s.台湾海峡气溶胶总悬浮颗粒物的干沉降通量也呈现出冬季的高[均值为7.31μg/(m2.s)],夏季的低[均值为2.23μg/(m2.s)]的特征.从空间分布上看,台湾海峡海表气溶胶干沉降速率出现1个高值中心,位于台湾海峡北部海域.总悬浮颗粒物干沉降通量出现2个高值中心和1个低值中心,分别位于台湾海峡北部海域、汕头至厦门海域和南海中北部海域.

To better stimulate the dry deposition velocity of aerosol particles to sea surface,wave effects were introduced to the improved Williams＇ model with parameterization of GW03 sea surface roughness on wave development.In this study the aerosol particle dry deposition velocity and total suspended particles（TSP） dry deposition flux were calculated over the Taiwan Strait using a newly improved model with satellite data,reanalysis data and ship-base measurement data from 2006 to 2007.The results showed obvious spatio-temporal variation with aerosol particle dry deposition velocity ranging from 5.83 cm/s to 6.17 cm/s and mean value of 6.00 cm/s,showing a clear seasonal pattern with a winter maximum（about 6.08 cm/s） and summer minimum（about 5.85 cm/s）.TSP dry deposition flux had similar seasonal variation,ranged from a maximum 7.31μg/（m2·s）in winter to a minimum 2.23μg/（m2·s）in summer.Spatially,there was an aerosol particle dry deposition high spot on the Fouzhou-Xinzhu sea area.TSP dry deposition flux had two high spots and one low spot,in the north of Taiwan Strait,Shantou-Xiamen sea area and north of South China Sea,respectively.