Why is the global warming proceeding much slower than expected

摘要: Upper air observations from radiosondes and microwave satellite instruments does not indicate any global warming during the last 19 years, contrary to surface measurements, where a trend is supposedly being found. This result somewhat difficult reconcile, since climate model experiments do reverse trend, namely, that upper tropospheric should warm faster than surface. To contribute toward an understanding of this difficulty, we have here undertaken some specific study effect on due decrease in stratospheric ozone Mount Pinatubo eruption 1991. The associated forcing was added greenhouse gases, sulfate aerosols (direct indirect effect), ozone, which investigated separate series experiments. Furthermore, ensemble order explore natural variability advanced exposed such over years. shows reduction cools only lower stratosphere but also troposphere, particular, middle part. In troposphere cooling leads significant warming. modeled generate response (stratospheric cooling) good agreement with measurements. Finally, analysis both considerable response, suggesting evolution having no period as likely another showing modest However, observed midtroposphere clear at found simulations.