Finer spatial and temporal resolution of the data are also examined. This and the persistent surface and tropospheric warmth of the 1980s might be consequences of increased concentrations of CO 2 and other radiatively active gases. Some recent theories on the decreased level of Antarctic O3 require significant increases in mid- and high latitude NO2. Authors report results they describe as speculative and limited in scope, in the hope of provoking further study. That these changes could be related to CO 2 warming is considered.
Regional variations suggest an orographic influence and increases southwesterly flow.
In related work, a primitive equation atmospheric model was used to study the effect on cyclogenesis of a 2 C rise in surface air and sea surface temperatures in the northeastern Pacific. Results indicate a population decline since 1800, which the authors propose is related to a warming trend in mean temperature. Applies a statistically optimal averaging technique to surface temperatures from about 300 stations in the Northern Hemisphere to estimate mean monthly and mean annual temperatures. Results support the existence of recent global warming. Inc. For more information on Global Change contact the Editorial Office.