Response of Northern Hemisphere extratropical cyclone activity and associated precipitation to climate change, as represented by the Community Climate System Model

2007 ◽  
Vol 112 (G4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Joel Finnis ◽  
Marika M. Holland ◽  
Mark C. Serreze ◽  
John J. Cassano
Keyword(s):  
Climate Change ◽  
Northern Hemisphere ◽  
Climate System ◽  
System Model ◽  
Extratropical Cyclone ◽  
Cyclone Activity ◽  
Community Climate System Model ◽  
Climate System Model ◽  
Community Climate

scholarly journals The Community Climate System Model Version 3 (CCSM3)

2006 ◽  
Vol 19 (11) ◽  
pp. 2122-2143 ◽  
Author(s):  
William D. Collins ◽  
Cecilia M. Bitz ◽  
Maurice L. Blackmon ◽  
Gordon B. Bonan ◽  
Christopher S. Bretherton ◽  
...  
Keyword(s):  
Climate Change ◽  
Sea Ice ◽  
Climate System ◽  
System Model ◽  
Ice Dynamics ◽  
Community Climate System Model ◽  
Climate System Model ◽  
Model Version ◽  
Systematic Biases ◽  
Community Climate

Abstract The Community Climate System Model version 3 (CCSM3) has recently been developed and released to the climate community. CCSM3 is a coupled climate model with components representing the atmosphere, ocean, sea ice, and land surface connected by a flux coupler. CCSM3 is designed to produce realistic simulations over a wide range of spatial resolutions, enabling inexpensive simulations lasting several millennia or detailed studies of continental-scale dynamics, variability, and climate change. This paper will show results from the configuration used for climate-change simulations with a T85 grid for the atmosphere and land and a grid with approximately 1° resolution for the ocean and sea ice. The new system incorporates several significant improvements in the physical parameterizations. The enhancements in the model physics are designed to reduce or eliminate several systematic biases in the mean climate produced by previous editions of CCSM. These include new treatments of cloud processes, aerosol radiative forcing, land–atmosphere fluxes, ocean mixed layer processes, and sea ice dynamics. There are significant improvements in the sea ice thickness, polar radiation budgets, tropical sea surface temperatures, and cloud radiative effects. CCSM3 can produce stable climate simulations of millennial duration without ad hoc adjustments to the fluxes exchanged among the component models. Nonetheless, there are still systematic biases in the ocean–atmosphere fluxes in coastal regions west of continents, the spectrum of ENSO variability, the spatial distribution of precipitation in the tropical oceans, and continental precipitation and surface air temperatures. Work is under way to extend CCSM to a more accurate and comprehensive model of the earth's climate system.

scholarly journals A Scalable and Adaptable Solution Framework within Components of the Community Climate System Model

2009 ◽  
pp. 332-341 ◽  
Author(s):  
Katherine J. Evans ◽  
Damian W. I. Rouson ◽  
Andrew G. Salinger ◽  
Mark A. Taylor ◽  
Wilbert Weijer ◽  
...  
Keyword(s):  
Climate System ◽  
System Model ◽  
Community Climate System Model ◽  
Climate System Model ◽  
Community Climate

scholarly journals Widely awaited community climate system model to be released soon

Eos ◽  
2002 ◽  
Vol 83 (11) ◽  
pp. 119
Author(s):  
Robert E. Dickinson ◽  
Jeffery Kiehl ◽  
Peter Gent
Keyword(s):  
Climate System ◽  
System Model ◽  
Community Climate System Model ◽  
Climate System Model ◽  
Community Climate

Sensitivity of Tropical Rainfall to Banda Sea Diffusivity in the Community Climate System Model

2008 ◽  
Vol 21 (23) ◽  
pp. 6445-6454 ◽  
Author(s):  
Markus Jochum ◽  
James Potemra
Keyword(s):  
General Circulation ◽  
Thick Layer ◽  
General Circulation Models ◽  
Climate System ◽  
System Model ◽  
Boreal Summer ◽  
Community Climate System Model ◽  
Climate System Model ◽  
Indonesian Seas ◽  
Community Climate

Abstract Several observational studies suggest that the vertical diffusivity in the Indonesian marginal seas is an order of magnitude larger than in the open ocean and what is used in most ocean general circulation models. The experiments described in this paper show that increasing the background diffusivity in the Banda Sea from the commonly used value of 0.1 cm2 s−1 to the observed value of 1 cm2 s−1 improves the watermass properties there by reproducing the observed thick layer of Banda Sea Water. The resulting reduced sea surface temperatures lead to weaker convection and a redistribution of precipitation, away from the Indonesian seas toward the equatorial Indian and Pacific Oceans. In particular, the boreal summer precipitation maximum of the Indonesian seas shifts northward from the Banda Sea toward Borneo, which reduces a longstanding bias in the simulation of the Austral–Asian Monsoon in the Community Climate System Model. Because of the positive feedback mechanisms inherent in tropical atmosphere dynamics, a reduction in Banda Sea heat loss of only 5% leads locally to a reduction in convection of 20%.

Origin of Pacific Multidecadal Variability in Community Climate System Model, Version 3 (CCSM3): A Combined Statistical and Dynamical Assessment

2008 ◽  
Vol 21 (1) ◽  
pp. 114-133 ◽  
Author(s):  
Yafang Zhong ◽  
Zhengyu Liu ◽  
R. Jacob
Keyword(s):  
North Pacific ◽  
Climate System ◽  
System Model ◽  
Community Climate System Model ◽  
Climate System Model ◽  
Multidecadal Variability ◽  
Model Version ◽  
The North ◽  
The North Pacific ◽  
Community Climate

Abstract Observations indicate that Pacific multidecadal variability (PMV) is a basinwide phenomenon with robust tropical–extratropical linkage, though its genesis remains the topic of much debate. In this study, the PMV in the Community Climate System Model, version 3 (CCSM3) is investigated with a combined statistical and dynamical approach. In agreement with observations, the modeled North Pacific climate system undergoes coherent multidecadal atmospheric and oceanic variability of a characteristic quasi-50-yr time scale, with apparent connections to the tropical Indo-Pacific. The statistical assessment based on the CCSM3 control integration cannot exclusively identify the origin of the modeled multidecadal linkage, while confirming the two-way interactions between the tropical and extratropical Pacific. Two sensitivity experiments are performed to further investigate the origin of the PMV. With the atmosphere decoupled from the tropical ocean, multidecadal variability in the North Pacific climate remains outstanding. In contrast, without midlatitude oceanic feedback to atmosphere, an experiment shows much reduced multidecadal power in both extratropical atmosphere and surface ocean; moreover, the tropical multidecadal variability seen in the CCSM3 control run virtually disappears. The combined statistical and dynamical assessment supports a midlatitude coupled origin for the PMV, which can be described as follows: extratropical large-scale air–sea interaction gives rise to multidecadal variability in the North Pacific region; this extratropical signal then imprints itself in the tropical Indo–Pacific climate system, through a robust tropical–extratropical teleconnection. This study highlights a midlatitude origin of multidecadal tropical–extratropical linkage in the Pacific in the CCSM3.

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