Modelling carbon-coupled energy and water dynamics of a boreal aspen forest in a general circulation model land surface scheme

2002 ◽  
Vol 22 (10) ◽  
pp. 1249-1265 ◽  
Author(s):  
Shusen Wang ◽  
Robert F. Grant ◽  
Diana L. Verseghy ◽  
T. Andrew Black
Keyword(s):  
General Circulation Model ◽  
Land Surface ◽  
General Circulation ◽  
Circulation Model ◽  
Water Dynamics ◽  
Land Surface Scheme ◽  
Aspen Forest ◽  
Surface Scheme

scholarly journals Water recycling by Amazonian vegetation: coupled versus uncoupled vegetation–climate interactions

2008 ◽  
Vol 363 (1498) ◽  
pp. 1865-1871 ◽  
Author(s):  
S.A Cowling ◽  
Y Shin ◽  
E Pinto ◽  
C.D Jones
Keyword(s):  
Land Surface ◽  
General Circulation ◽  
Circulation Model ◽  
Bowen Ratio ◽  
Rate Of Change ◽  
Water Dynamics ◽  
Cloud Formation ◽  
Recycled Water ◽  
Climate Interactions ◽  
Surface Scheme

To demonstrate the relationship between Amazonian vegetation and surface water dynamics, specifically, the recycling of water via evapotranspiration (ET), we compare two general circulation model experiments; one that couples the IS92a scenario of future CO 2 emissions to a land-surface scheme with dynamic vegetation (coupled) and the other to fixed vegetation (uncoupled). Because the only difference between simulations involves vegetation coupling, any alterations to surface energy and water balance must be due to vegetation feedbacks. The proportion of water recycled back to the atmosphere is relatively conserved through time for both experiments. Absolute value of recycled water is lower in our coupled relative to our uncoupled simulation as a result of increasing atmospheric CO 2 that in turn promotes lowering of stomatal conductance and increase in water-use efficiency. Bowen ratio increases with decreasing per cent broadleaf cover, with the greatest rate of change occurring at high vegetation cover (above 70% broadleaf cover). Over the duration of the climate change simulation, precipitation is reduced by an extra 30% in the coupled relative to the uncoupled simulations. Lifting condensation level (proxy for base height of cumulus cloud formation) is 520 m higher in our coupled relative to uncoupled simulations.

scholarly journals Modelling root water uptake in a complex land surface scheme coupled to a GCM

1998 ◽  
Vol 2 (2/3) ◽  
pp. 239-255 ◽  
Author(s):  
P. de Rosnay ◽  
J. Polcher
Keyword(s):  
Soil Moisture ◽  
Soil Water ◽  
Water Uptake ◽  
Land Surface ◽  
General Circulation ◽  
Circulation Model ◽  
Root Water Uptake ◽  
Soil Water Storage ◽  
Land Surface Scheme ◽  
Surface Scheme

Abstract. The aim of this paper is to improve the representation of root water uptake in the land surface scheme SECHIBA coupled to the LMD General Circulation Model (GCM). Root water uptake mainly results from the interaction between soil moisture and root profiles. Firstly, one aspect of the soil hydrology in SECHIBA is changed: it is shown that increasing the soil water storage capacity leads to a reduction in the frequency of soil water drought, but enhances the mean evapotranspiration. Secondly, the representation of the soil-vegetation interaction is improved by allowing a different root profile for each type of vegetation. The interaction between sub-grid scale variabilities in soil moisture and vegetation is also studied. The approach consists of allocating a separate soil water column to each vegetation type, thereby 'tiling' the grid square. However, the possibility of choosing the degree of soil moisture spatial heterogeneity is retained. These enhancements of the land surface system are compared within a number of GCM experiments.

scholarly journals The CSIRO Mk3L climate system model version 1.0 – Part 1: Description and evaluation

2011 ◽  
Vol 4 (2) ◽  
pp. 483-509 ◽  
Author(s):  
S. J. Phipps ◽  
L. D. Rotstayn ◽  
H. B. Gordon ◽  
J. L. Roberts ◽  
A. C. Hirst ◽  
...  
Keyword(s):  
Sea Ice ◽  
General Circulation Model ◽  
Land Surface ◽  
General Circulation ◽  
Regional Scale ◽  
Circulation Model ◽  
Climate System ◽  
System Model ◽  
Desktop Computer ◽  
Climate System Model

Abstract. The CSIRO Mk3L climate system model is a coupled general circulation model, designed primarily for millennial-scale climate simulations and palaeoclimate research. Mk3L includes components which describe the atmosphere, ocean, sea ice and land surface, and combines computational efficiency with a stable and realistic control climatology. This paper describes the model physics and software, analyses the control climatology, and evaluates the ability of the model to simulate the modern climate. Mk3L incorporates a spectral atmospheric general circulation model, a z-coordinate ocean general circulation model, a dynamic-thermodynamic sea ice model and a land surface scheme with static vegetation. The source code is highly portable, and has no dependence upon proprietary software. The model distribution is freely available to the research community. A 1000-yr climate simulation can be completed in around one-and-a-half months on a typical desktop computer, with greater throughput being possible on high-performance computing facilities. Mk3L produces realistic simulations of the larger-scale features of the modern climate, although with some biases on the regional scale. The model also produces reasonable representations of the leading modes of internal climate variability in both the tropics and extratropics. The control state of the model exhibits a high degree of stability, with only a weak cooling trend on millennial timescales. Ongoing development work aims to improve the model climatology and transform Mk3L into a comprehensive earth system model.

scholarly journals A catchment-based approach to modeling land surface processes in a general circulation model: 1. Model structure

2000 ◽  
Vol 105 (D20) ◽  
pp. 24809-24822 ◽  
Author(s):  
Randal D. Koster ◽  
Max J. Suarez ◽  
Agnès Ducharne ◽  
Marc Stieglitz ◽  
Praveen Kumar
Keyword(s):  
General Circulation Model ◽  
Land Surface ◽  
General Circulation ◽  
Circulation Model ◽  
Surface Processes ◽  
Model Structure ◽  
Land Surface Processes
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