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sup36/supCl bomb peak: comparison of modeled and measured data

机译：36 Cl炸弹峰：建模数据与实测数据的比较

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The extensive nuclear bomb testing of the fifties and sixties and the finaltests in the seventies caused a strong 36Cl peak that has been observedin ice cores world-wide. The measured 36Cl deposition fluxes in eightice cores (Dye3, Fiescherhorn, Grenzgletscher, Guliya, Huascarán, NorthGRIP, Inylchek (Tien Shan) and Berkner Island) were compared with anECHAM5-HAM general circulation model simulation (1952–1972). We find a goodagreement between the measured and the modeled 36Cl fluxes assuming thatthe bomb test produced global 36Cl input was ~80 kg. The modelsimulation indicates that the fallout of the bomb test produced 36Cl islargest in the subtropics and mid-latitudes due to the strongstratosphere-troposphere exchange. In Greenland the 36Cl bomb signal isquite large due to the relatively high precipitation rate. In Antarctica the36Cl bomb peak is small but is visible even in the driest areas. Themodel suggests that the large bomb tests in the Northern Hemisphere arevisible around the globe but the later (end of sixties and early seventies)smaller tests in the Southern Hemisphere are much less visible in theNorthern Hemisphere. The question of how rapidly and to what extent the bombproduced 36Cl is mixed between the hemispheres depends on the season ofthe bomb test. The model results give an estimate of the amplitude of thebomb peak around the globe.
机译：五十年代和六十年代的广泛核弹测试以及七十年代的最终测试引起了 36 Cl的强烈峰值，在全世界的冰芯中都观察到了这一峰值。将80个冰芯（Dye3，Fiescherhorn，Grenzgletscher，Guliya，Huascarán，NorthGRIP，Inylchek（天山）和Berkner Island）中测得的 36 Cl沉积通量与ECHAM5-HAM常规循环模型模拟（1952年）进行了比较。 –1972年）。假设炸弹试验产生的整体 36 Cl输入为〜80 kg，我们发现实测通量和建模的 36 Cl通量之间存在良好的一致性。模型仿真表明，由于平流层-对流层之间的强交换，在亚热带和中纬度地区，炸弹试验产生的 36 Cl的沉降量最大。在格陵兰，由于相对较高的降水率， 36 Cl炸弹信号相当大。在南极洲， 36 Cl炸弹峰很小，但即使在最干燥的地区也可见。该模型表明，北半球的大型炸弹试验在全球范围内都是可见的，而南半球的较小的试验（六十年代末和七十年代初）在北半球却很少见。炸弹产生的 36 Cl在半球之间混合的速度和程度如何的问题取决于炸弹测试的季节。模型结果给出了地球周围炸弹峰振幅的估计值。

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