A Study of Atmospheric Motions in the Stratosphere and Troposphere Indicated by Excess Carbon-14

[摘要] Variations of excess carbon-14 injected into atmosphere by nuclear tests are analyzed during the second moratorium of atomic bomb tests.Regression equations are obtained from the time series data at different altitudes and latitudes. Vertical propagation speed of the phase of annual variation is estimated from phase difference at different altitudes. Downward propagation speed of 1.1 km/month has been obtained in the layer from 60, 000 to 40, 000 feet (18.3-12.2 km) at 72°N. At 33°N an upward propagation speed of 2.4 km/month is seen between 100, 000 and 90, 000 feet (30.5 and 27.4 km). Analyses of time series data of excess carbon-14 amount and temperature suggest that variations in carbon-14 amount with period of 1.5 to 2 months are caused by vertical motions.Some discussion is presented on variations in carbon-14 amount in comparison with ozone.

[学科分类] 大气科学