climate and earth systems models using scientific computing eigil kaas professor in meteorology and...
TRANSCRIPT
Climate and Earth Systems Models using Scientific Computing
Eigil Kaas
Professor in Meteorology and Climate Dynamics
Niels Bohr Institute
University of Copenhagen.
In front of the ENIAC, April 4, 1950: H.Wexler, J. von Neumann, M. H. Frankel, J. Namias, J. C. Freeman, R. Fjortoft, F. W. Reichelderfer, and J. G. Charney.
The Development of Electronic Computers
The new DMI-computer: Cray XT5
(in a bigger configuration).
3-dimensional dynamic Earth system models
Applications:
• Simulating basic processes and changes in the entire Earth system.
• Ocean and land-surface carbon cycle
• Interactive aerosol module
• Interactive chemistry (mostly gas phase)
• Ice sheets
• Biology
• …
Navier-Stokes equation (Unit mass version of “Newton's second law) expressed in the accelerated coordinate system of the Earth
12
d
dp
dt
VV g F
Equation of state for ideal gases (i.e. no particle density included in ρ). p
RT
v p
dT d dT dpc p c Qdt dt dt dt
The first equation of thermodynamics
Continuity equation for dry aird
d
d
dt
V
Continuity equation for various tracers including water vapour
t
tt
d+S
dt V
t
tq
dqS
dt
non particles
tt
Governing dynamical equations for the atmosphere
Hybrid sigma theta
Example of validation of atmospherec models:Precipitation
SST Errors: ECHAM5/MPI-OM
Systematic errors in sea surface temperature (SST)
Observed (black line) anthropogenic + natural forcings (red lines), anthropogenic forcings only (blue lines), anthroponegic (- effects of black carbon) + natural forcings (green line).
Hadley Centre simulations with HADGEM1 in ENSEMBLES
Circulation changes II
CLIMAP SSTs MOD SSTs
topographycontrol
CLIMAP+topo MOD+topo