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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

&lt;sup&gt;36&lt;/sup&gt;Cl bomb peak: comparison of modeled and measured data

<sup>36</sup>Cl bomb peak: comparison of modeled and measured data