State Agro-Meteorological Centre Meteorological Centre Gangtok
Sensitivity Study of a Coupled Carbon Dioxide Meteorological Modeling System with Case Studies
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Transcript of Sensitivity Study of a Coupled Carbon Dioxide Meteorological Modeling System with Case Studies
Sensitivity Study of a Coupled Carbon Dioxide Meteorological Modeling System with Case
Studies
András Zénó Gyöngyösi, Tamás Weidinger, László Haszpra, Zsuzsanna Iványi and Hiroaki
Kondo
The NIRE CO2 @ ETA model
Overview
Short model description i. NIREii. ETA
Implementationi. NIREii. ETA
Coupling of NIRE to ETA Sensitivity studies Case studies Conclusion, future works
Model Description
➲ NIRE ● Mesoscale circulation model (simple dynamics)● Dispersion model
➲ Boussinesq-approximation➲ Anelastic equations➲ Terrain following s-coordinate (vrbl. res.)➲ Staggered (Arakawa) grid➲ First order turbulent closure (K ~ Richardson #)
● Vertical diff – implicit solver● Horizontal diff – just for numerical stability
➲ Srfc: Monin-Obuhov; Energy Balance Eq.➲ Soil: Thermal conductivity eq.
Surface parameterization
H2O: passive scalar, saturation @ srfc➲ No clouds, relevant in sfc heat balanceCO2: ➲ Vegetation (Photosynth.+Res.) for each veg. mosaic => synthesized flux➲ Anthropogen:
● area sources @ srfc (heating and traffic)● large stacks – plume rise (CONCAWE)
Boundary conditioning; Numerical integration
➲ Lateral bndry● Flow relaxation zone
➲ Top bndry● Sponge layer
➲ Initialization● Dynamical init. – spin-up
➲ Time integration: Leap frog – Forward each 20th step to adjust numerical mode
Implementation
➲ Surface files● IGBP landcover landuse database (USGS)
➲ Sensitivity test● Dynamics
● Superadiabatic stratification● Strong wind
➲ Basin● Carpathian Basin @ bndry: nonlinear
interaction topography -- bndry
Model bndry interacts w/ topography – strong nonlinear effectsMore effective bndry conditions are necessary
Sensitivity Study
Mixing layer depth (Convective PBL) @ different cloud amounts
Time evolution of CO2 in the model domain
The “Meteorological driver”
➲ NCEP/ETA model (EMS NWS/NOAA):● Limited area NWP model● Primitive hydrostatic eqs – non-hydrost.
Option● Modified terrain following coordinate system
● Eta (modified sigma)● approx horiz. srfs separatio nof lee flow
● sfc & PBL param. sophisticated
Adaptation
•“Operational” run for Central Europe•”Operational” run for Central Europe
Adaptation of ETA
+ Budapest
Init & bndry conds downloaded from NCEP every morning
Dynamical Test (non-hydrostatic option)
➲ Hydrostatic equations, non-hydrostatic effects parameterized
● Small-scale effect are more non-hydrost.● Small impact on solutions● In the standard run non-hydrost. Option not
implemented● DF init. not used
H500 Psfc
The Mass fieldPressure falling
(approaching system)
4105 p
p
510H
H
NH departure
∆h~-.4—1.4h~5530—5620
9m
The Wind field
NH wind strongermore KE generation
NH departures associated with topography
Coupling NIRE to ETA
• Super-adiabatic lapse rate instab• Extreme wind speed • instab @ lat & top bndry• Flow relax term • changed to sine shape• Top sponge layer enlarged• Adiabat. adjustment:
A Case study
• Cold inversion in the Basin
02 February 2006
“Inversion case”
• Convective boundary layer after the decay of the inversion
06 February 2006
“Convection case”
Effect of a single large stack
● Plume rise (CONCAWE – Briggs, 1968)● 200 m high● 280 m3/s @ 3000C
● 1000 t/day CO2 emission● Located in the middle of the domain
Time evolution of temperature
Inversion Convection
Temperature Profiles @ different time of the day
Inversion Convection
Time evolution of CO2
Inversion Convection
CO2 Profiles @ different time of the day
Inversion Convection
12 LST
15 LST
18 LST
22 LST
Conclusion
➲ NIRE is able to provide realistic meteorological conditions in suitable initial and boundary conditions taken from ETA
➲ The modular structure of it makes them suitable for PBL tests
➲ The coupled system is able to calculate concentration for different extreme meteorological conditions
Future works
➲ Introduction of newer parameterization schemes into the CO2 model – further sensitivity and case studies
➲ Daily coupled system runs for the estimation of annual variation of surface fluxes
➲ Estimation of annual Carbon budget of the Carpatian Basin