RADON 222 AND TROPOSPHERIC VERTICAL TRANSPORT.
RADON 222 AND TROPOSPHERIC VERTICAL TRANSPORT.
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氡气 222 和对流层垂直传输。
DOI：
10.1029/jd089id05p07291
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发表时间：
1984
影响因子：
--
通讯作者：
R. Cicerone
中科院分区：
文献类型：
--
作者：
S. Liu;J. R. McAfee;R. Cicerone
氡222是一种惰性气体，其损失只是由于放射性衰变造成的，半衰期为3.83天(5.51天的指数寿命)。它是一个非常有用的大陆空气示踪剂，因为只有地面大陆源才是重要的。本文通过对夏季、冬季和春秋季节的平均，分析了以前发布的测量的**2**2**2RN剖面。分析表明，在夏季，大约55%的**2**2**2RN是在行星边界层上方输送的，比其他季节要多得多。同样，在夏季，大约20%的海平面上升到5.5公里(500毫巴)以上。利用平均廓线求出了垂直涡旋扩散系数，最大值在对流层中层为5-7×10**5 cm**2 S**负1，在地面附近为8×10**3-5×10**4 cm**2 S**负*1。
Radon 222 is an inert gas whose loss is due only to radioactive decay with a half life of 3. 83 days (5. 51-day 'exponential' lifetime). It is a very useful tracer of continental air because only ground level continental sources are significant. Previously published measured **2**2**2Rn profiles are analyzed here by averaging for the summer, winter, and spring-fall seasons. The analysis shows that in summer, about 55% of the **2**2**2Rn is transported above the planetary boundary layer, considerably more than during the other seasons. Similarly, in summer, about 20% rises to over 5. 5 km (500 mbar). The average profiles have been used to derive vertical eddy diffusion coefficients with maximum values of 5-7 multiplied by 10**5 cm**2 s** minus **1 in the midtroposphere and 8 multiplied by 10**3 to 5 multiplied by 10**4 cm**2 s** minus **1 near the surface.