Spatial Variation of Nitrogen Deposition to Experimental Forests and its Wet and Dry Deposition

在东京都网络的多摩、富萨和日野原三个近距离站点，探讨了硝酸盐和铵离子湿沉降的时空变化以及相应的变量。没有显着的时间变化是可辨别的硝酸盐或铵浓度。然而，硝酸盐和铵的体积加权月平均浓度分别为42.8和38.2μ mol L-1，明显高于东京的结果，分别高出1.6至1.9和1.5至2.1倍。特别是硝酸盐浓度肯定高于多摩站。最近在该实验站对氮氧化物和臭氧的密集现场测量表明，氮氧化物NO在夜间达到零，这可能会增强N205的硝酸盐物种形成，因为臭氧与NO2反应形成NO3自由基。硝酸盐和铵离子的湿沉降在多摩是在日本的前30%的沉积。打算建造一座观测塔，用于干沉降研究。虽然由于一些需要改进的地方，使用实验塔的研究被推迟了，但初步研究已经发展成为使用改进塔的一些常规测量。

The temporal and spatial variations of wet deposition of nitrate and ammonium ions were explored together with corresponding variables at three close stations, Tama, Fussa, and Hinohara, of Tokyo Metropolitan Government network. No significant temporal variations were discernible for nitrate or ammonium concentration. Volume-weighted monthly mean concentrations, however, were 42.8 and 38.2μ mol L-1 for nitrate and ammonium, respectively, which were significantly higher than those of Tokyo results by factors of 1.6 to 1.9 and 1.5 to 2.1. Particularly nitrate concentration is surely higher than that at Tama station. A recent intensive field measurement of nitrogen oxides and ozone in this experimental station shows that nitrogen oxide, NO, reached zero during night time, which might enhance nitrate species formation from N205 because ozone reacts with NO2 to form NO3 radical. Wet deposition of nitrate and ammonium ions at Tama was in the top 30% of the deposition in Japan. An observational tower was intended to construct for the dry deposition studies. Although the studies with the use of the experimental tower were delayed because of some needed improvements, preliminary studies have developed into some routine measurements with the improved tower.