Seasonal variation of free tropospheric aerosol particles at Mt. Tateyama, central Japan
Seasonal variation of free tropospheric aerosol particles at Mt. Tateyama, central Japan
复制标题
DOI：
10.1029/2003jd003544
复制
发表时间：
2003-12
影响因子：
--
通讯作者：
K. Osada;M. Kido;H. Iida;K. Matsunaga;Y. Iwasaka;M. Nagatani;H. Nakada
中科院分区：
文献类型：
--
作者：
K. Osada;M. Kido;H. Iida;K. Matsunaga;Y. Iwasaka;M. Nagatani;H. Nakada
[1] 1999 年 1 月至 2002 年 11 月，在日本中部立山西侧的室堂平（北纬 36.6 度，东经 137.6 度，海拔 2450 米）测量了大气气溶胶颗粒物的数量分布和 O3 浓度。本研究使用了 2400 至 0500 小时（当地时间）的夜间数据，分析了日本上空自由对流层气溶胶和 O3 的日变化特征。 O3 浓度变化较小（标准差为 4 ppbv），冬季（10 月至 2 月）平均值为 40 ppbv；变化较大（8 ppbv），春季（3 月至 5 月）平均值较高，为 51 ppbv；变化较大（14 ppbv），夏季（6 月至 9 月）平均值较低，为 32 ppbv。堆积颗粒物（0.3μm～1.0μm）月平均体积浓度最高（2.7μm3/cm3）出现在4月份，比夏季至冬季平均值1.2μm3/cm3高出约10倍。粗颗粒物日夜间体积浓度的变异性在春季较高（标准差为13.6μm3/cm3），而在一年中的其他时间较低（约2μm3/cm3）。春季粗颗粒物体积浓度高、变化大，是由于来自亚洲大陆的科萨（黄沙）颗粒物频繁到来造成的。在科萨现象期间，经常观察到粗体积浓度的快速增加在 3 小时内增加多达 30 倍。 2001 年，科萨的活动特别强劲，季节延长，从 1 月初开始，到 7 月初结束。
[1] Number-size distribution of atmospheric aerosol particles and O3 concentration were measured at Murododaira (36.6N, 137.6E, 2450 m above sea level (asl)) on the western flank of Mt. Tateyama in central Japan from January 1999 to November 2002. This study used nighttime data from 2400 to 0500 hours (local time) on the basis of analysis of their diurnal variation to characterize free tropospheric aerosols and O3 over Japan. The O3 concentration shows small variability (standard deviation of 4 ppbv) with the mean value of 40 ppbv in winter (October to February), large variability (8 ppbv) with the higher mean value of 51 ppbv in spring (March to May), and large variability (14 ppbv) with the lower mean value of 32 ppbv in summer (June to September). Highest monthly mean volume concentration (2.7 μm3/cm3) of accumulation particles (0.3 μm 1.0 μm) was found in April, which was about 10 times higher than the mean value of 1.2 μm3/cm3 from summer to winter. Variability of daily nighttime volume concentrations of the coarse particles was high (standard deviation of 13.6 μm3/cm3) in spring and low (about 2 μm3/cm3) in the rest of the year. High volume concentration with large variability of the coarse particles in spring is caused by frequent arrival of Kosa (yellow dust) particles from the Asian continent. Rapid enhancement of coarse volume concentration was often observed to increase as much as 30 times within 3 hours during Kosa phenomena. The year 2001 had particularly strong Kosa activity with a prolonged season starting early January and ending early July.