Simulating the climate since 1000 AD with the AOGCM ECHO-G

Details Simulating the climate since 1000 AD with the AOGCM ECHO-G Simulating the climate since 1000 AD with the AOGCM ECHO-G

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..329g&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Computer Science

7

General Circulation Models, Transient Integrations, Solar Forcing, Anthropogenic Forcing

Scientific paper

Assessment of climate variability and changes through the last millennium is crucial for understanding and modeling current and future climate. Efforts have relied both in the statistical reconstruction of climate variability using proxy data and the numerical simulation of past climate states with the use of climate models. Numerical simulations have used models and experiments of varying complexity and design mostly focused on the impacts of solar variability on climate. This work explores the response of a state-of-the-art global atmosphere-ocean climate model to changes in external forcing. The analysis focuses on two long climate integrations with the ECHO-G global climate model (MPI, Hamburg) in which the external forcing has been gradually changed along the simulations according to the estimations of changes in the solar irradiance, atmospheric reflectivity due to volcanic eruptions and the concentrations of greenhouse gases. One of this integrations (FOR1) covers the period AD 1000 to 1990 and a second integration (FOR2) spans the period 1550 to 1990 A.D.

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