Download A coupled biosphere-hydrosphere-atmosphere model with dynamic

Forschungszentrum Karlsruhe
in der Helmholtz-Gemeinschaft
Institute for Meteorology and Climate Research (IMK-IFU)
Garmisch-Partenkirchen, Germany
Towards integrated regional earth system modeling:
A coupled biosphere-hydrosphere-atmosphere model
with dynamic vegetation and chemistry
Edwin Haas, Rüdiger Grote, Renate Forkel, Richard Knoche, Harald Kunstmann
Abstract Climate change impacts the entire coupled Biosphere-Hydrosphere-Atmosphere (BHA) system. Quantification of the
feedbacks between the BHA-System and regional climate requires the compartment-cross-cutting description of all climate
relevant physical, chemical, and biological processes. Integrated regional climate change impact analysis still lacks an
adequate BHA-modeling system.
In order to investigate these complex feedback mechanisms between climate and regional ecosystems, a new BHA-modeling
system is developed, based on 1) the biosphere-hydrosphere model-framework MOBILE (MOdular BIosphere simuLation
Environment) which is coupled 2) to the regional meteorology-chemistry-climate-model MCCM.
MCCM is based on a climate version of MM5, which is extended by a chemistry transport model, including gas phase air
chemistry mechanisms and primary/secondary aerosols processes. MOBILE consists of modules accounting for dynamic
vegetation development, soil water and energy balance, biogenic VOC emissions, bio-geochemical C/N cycles in vegetation
and soil. It has a modular design, based on individual well established and extensively evaluated stand alone models of
different levels of complexity. It accounts for variable vegetation- and land use types within different ecosystems and allows
variable numbers of layers for canopy, foliage and soil.
In our regional BHA-modeling system, the more detailed hydro- and biosphere modules of MOBILE replace the original, simpler
MCCM land surface model. The bidirectional data exchange between MCCM and MOBILE accounts for the different time
scales of the underlying processes resulting in information update frequencies between seconds and 24 hours.
MCCM-MOBILE Model-Coupling
Initialization
MCCM
Time-Loop
Initialization
MOBILE
CO2 (atmospheric / endogene)
sugars
MM5 Meteorology
from starch degradation
or xylem transport
Vegetation
development
Vegetation
C & N balance
Chemical
Transformation
Canopy air
chemistry
vegetation
C- & Nbalance
vegetation
development
PEP
PEP
Atmospheric
N-deposition
Atmospheric
N-deposition
Organic
matter
Ammonification
Plant N
NH4+
Nitrification
N2O
NO3- → NO2- → NO → N2O → N2
N2
NO 3
Denitrification
NH4+ → NH2OH → (NOH) → NO2- → NO3↑↓
N2O + NO
Death of
microbes
microbial
N-immobilisation
mikrobial biomass
NO
NO3--leaching
soil
C- & Nbalance
Pyr
DOXP
dxr
MEP
IDP
DMADP
?
NADPH
NADP +
IsoS
(3x IDP) IDP + DMADP
2x IDP + DMADP
Cytoplasm
FDP
Sesquiterpenes
GDP
GGDP
Higher
isoprenoides
Isoprene
Monoterpenes
MonoS
climate/
air chemistry
canopy air
chemistry
Module
coupler
Plant
N-uptake
Canopy & soil
physics
Pyr
HMG-CoA
Plant litter
production
Species Transport
& Mixing
Triose-P
dxs
Acetyl-CoA
Mevalonate
Antropogenic
Emissions
Chloroplast
Triose-P
physics
(canopy &
biosphere
soil)
water
balance
Model
coupler
Data
regional
water
balance
N2-fixation
Model Coupling
Interface
Soil C & N
balance
Input / Output
Biosphere water
balance
Finalization
Termination
Implementation
The model coupling approach is using Fortran90 and C++
mixed language programming, as the models were
developed in different programming languages. The
biosphere-hydrosphere-land-surface model was implemented
as a module into the MCCM integration scheme, such that
both models affect each other on concurrent time levels.
The resulting modelling system is
parallelized using OpenMP and
MPI parallelization techniques for
the efficient use on Linux-Cluster
HPC-environments.
Current Developments
• Replacement of the currently used empirical emission
model with a bio-chemically based process model.
• Replacement of the MCCM soil model with the more
detailed model that additionally accounts for C & N biogeochemical processes.
• Incorporating canopy air chemistry processes to account
for VOC degradation and transformation within the
biosphere.
Contact:
Dr. Edwin Haas
Forschungszentrum Karlsruhe
Institute for Meteorology and Climate Research (IMK-IFU)
Garmisch-Partenkirchen, Germany
[email protected]