氧同位素示踪夏季北冰洋（62.3°~74.7° N）大气硝酸盐形成途径的研究

贺鹏真,谢周清

Using oxygen isotopes to trace the formation pathways of atmospheric nitrate over summer Arctic Ocean （62.3°~74.7° N）

Pengzhen HE,Zhouqing XIE

图5 特征样品采集期间的气团后向轨迹。图中红色实线为样品2采集期间［最低Δ17O（NO3–）=21.7‰，8月6日至7日］的气团后向轨迹，蓝色实线为样品5和6采集期间［最高Δ17O（NO3–）=28.1‰~28.8‰， 8月12日至14日］的气团后向轨迹。气团后向轨迹反演时长为5 d，高度为50 m（接近采样点海拔高度），黑色点线为样品采集覆盖的位置，红色点代表城市。该图由TrajStat软件所作［44］，该软件使用HYSPLIT后向轨迹模式，其中气象场数据来自于美国国家海洋和大气管理局（NOAA），分辨率为1°×1°

Fig. 5 The backward trajectory analysis of air mass during the collection of featured aerosol samples. The red lines represent backward trajectories of air mass during the collection of Sample 2 in August 6—7 when Δ17O（NO3–） is the lowest while the blue lines represent backward trajectories of air mass during the collection of Samples 5~6 in August 12—14 when Δ17O（NO3–） are the highest. The running time and altitude for each of the backward trajectory analysis is 5 days and 50 m， respectively. The black dot-lines represent locations of the sampling covered， the red dots are cities on land. This figure was drawn by TrajStat［44］， in which the model of HYSPLIT and meteorological data of 1°×1° from NOAA was used