Study on influence of anthropogenic aerosol on heat island structure

在城市地区，向下红外辐射的连续测量相当有限。在这项研究中，在东京地区观测到向下的红外辐射。数据进行了比较，在郊区（筑波市）的业务观察。东京晴空条件下的1小时平均辐射量比筑波高出约3 Wm^-2，差异具有统计学意义。数值模拟结果表明，红外辐射的差异与近地面温度垂直廓线及其日变化有关。各站点间气溶胶浓度差异的估计影响很小

Continuous measurement of downward infrared radiation has been rather limited in urban area. In this study, downward infrared radiation was observed at Tokyo area. Data were compared with those observed operationally at suburban area (Tsukuba City). One-hour mean radiation in clear sky condition at Tokyo was larger approximately 3 Wm^-2 than those observed at Tsukuba and the difference was statistically significant. Additional investigation including numerical simulation showed that the difference in downward infrared radiation was related to the vertical temperature profile near land surface and its diurnal variation. Estimated influence of aerosol concentration difference between the sites was small