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RISVariability of the Indian Monsoon in the ECHAM3 Model: Sensitivity to Sea Surface Temperature, Soil Moisture, and the Stratospheric Quasi-Biennial Oscillation
Publisher: American Meteorological Society
Abstract: The variability of the monsoon is investigated using a set of 90-day forecasts [MONEG (Tropical Ocean Global Atmosphere Monsoon Numerical Experimentation Group) experiments] and a set of AMIP-type (Atmospheric Model ...
Variability of the Indian Monsoon in the ECHAM3 Model: Sensitivity to Sea Surface Temperature, Soil Moisture, and the Stratospheric Quasi-Biennial Oscillation
Publisher: American Meteorological Society
Abstract: The variability of the monsoon is investigated using a set of 90-day forecasts [MONEG (Tropical Ocean Global Atmosphere Monsoon Numerical Experimentation Group) experiments] and a set of AMIP-type (Atmospheric Model ...
Voigt Line Approximation in the ECMWF Radiation Scheme
Publisher: American Meteorological Society
Abstract: The vertical extension of a general circulation model generally requires a modification of the model's highly parameterized radiation scheme in order to include approximately the absorption by lines with a Voigt profile. ...
The Influence of the Spectral Truncation on the Simulation of Waves in the Tropical Stratosphere
Publisher: American Meteorological Society
Abstract: onvectively triggered waves are the main driver of the tropical stratospheric circulation. In atmospheric models, the model?s resolution limits the length of the simulated wave spectrum. In this study, the authors compare ...
Climatology and Forcing of the Quasi-Biennial Oscillation in the MAECHAM5 Model
Publisher: American Meteorological Society
Abstract: The quasi-biennial oscillation (QBO) in the equatorial zonal wind is an outstanding phenomenon of the atmosphere. The QBO is driven by a broad spectrum of waves excited in the tropical troposphere and modulates transport ...
The Influence of Sea Surface Temperatures on the Northern Winter Stratosphere: Ensemble Simulations with the MAECHAM5 Model
Publisher: American Meteorological Society
Abstract: The role of interannual variations in sea surface temperatures (SSTs) on the Northern Hemisphere winter polar stratospheric circulation is addressed by means of an ensemble of nine simulations performed with the middle ...
Tests of Monte Carlo Independent Column Approximation in the ECHAM5 Atmospheric GCM
Publisher: American Meteorological Society
Abstract: The Monte Carlo Independent Column Approximation (McICA) method for computing domain-average radiative fluxes allows a flexible treatment of unresolved cloud structure, and it is unbiased with respect to the full ICA, but ...
Sensitivity of Simulated Climate to Horizontal and Vertical Resolution in the ECHAM5 Atmosphere Model
Publisher: American Meteorological Society
Abstract: The most recent version of the Max Planck Institute for Meteorology atmospheric general circulation model, ECHAM5, is used to study the impact of changes in horizontal and vertical resolution on seasonal mean climate. In ...
The HAMMONIA Chemistry Climate Model: Sensitivity of the Mesopause Region to the 11-Year Solar Cycle and CO2 Doubling
Publisher: American Meteorological Society
Abstract: This paper introduces the three-dimensional Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA), which treats atmospheric dynamics, radiation, and chemistry interactively for the height range from the earth?s ...
Tropical Cumulus Convection and Upward-Propagating Waves in Middle-Atmospheric GCMs
Publisher: American Meteorological Society
Abstract: It is recognized that the resolved tropical wave spectrum can vary considerably among general circulation models (GCMs) and that these differences can have an important impact on the simulated climate. A comprehensive ...