Interactive ozone induces a negative feedback in CO2-driven climate change simulations

Interactive ozone and methane chemistry in GISS-E2 historical and future climate simulations

The new generation GISS climate model includes fully interactive chemistry related to ozone in historical and future simulations, and interactive methane in future simulations. Evaluation of ozone, its tropospheric precursors, and methane shows that the model captures much of the largescale spatial structure seen in recent observations. While the model is much improved compared with the previou...

Ozone, Climate, and Global Atmospheric Change

The Acpi Climate Change Simulations

The Parallel Climate Model (PCM) has been used in the Accelerated Climate Prediction Initiative (ACPI) Program to simulate the global climate response to projected CO2, sulfate, and other greenhouse gas forcing under a business-as-usual emissions scenario during the 21st century. In these runs, the oceans were initialized to 1995 conditions by a group from the Scripps Institution of Oceanograph...

Ice-driven CO2 feedback on ice volume

The origin of the major ice-sheet variations during the last 2.7 million years is a long-standing mystery. Neither the dominant 41 000-year cycles in δ18O/ice-volume during the late Pliocene and early Pleistocene nor the latePleistocene oscillations near 100 000 years is a linear (“Milankovitch”) response to summer insolation forcing. Both responses must result from non-linear behavior within t...

Atmospheric dynamics feedback: concept, simulations and climate

The regional climate response to radiative forcing is largely controlled by changes in the atmospheric circulation. It has also been suggested that global climate sensitivity depends on the circulation response, an effect we call the “atmospheric dynamics feedback”. Using a technique to isolate the effect of changes in atmospheric circulation on top-of-atmosphere (TOA) radiation, we calculate t...