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Comparisons are made between the seasonal behavior of the global electrical circuit and the surface air temperature for the Tropics and for the globe. Positive correlations between global circuit parameters and temperature are identified on both semiannual and annual timescales. Lightning is the global circuit quantity found most responsive to temperature, with a sensitivity of the order of 10% per 1°C. These findings lend further validity to the use of global circuit measurements as a diagnostic for global change.
Earle Williams (1994) studied this question.