Global Simulation of CH 3 Cl
description
Transcript of Global Simulation of CH 3 Cl
Global Simulation of CH3Cl
Model Description
• GEOS-CHEM global 3D model (v.5.02)
• DAO GEOS-STRAT with simulation year from September 1996 - August 1997
• Resolution: 4 º latitude x 5 º longitude, 26 layers
CH3Cl Emissions used in this study
Sources Gg/year Data description
Biogenic 2,430Hypothetical tropical source (Lee-Taylor et al. [2001])
Biomass burning 910 GEIA Inventory (Lobert et al. [1999])
Ocean (net)
660 GEIA Inventory (Khalil et al. [1999])
160Calculated using saturation anomaly and transfer velocity (Khalil et al. [1999] and Wanninkhof [1992])
Salt marshes 170 Rhew et al. [1999]
Anthropogenic 162GEIA Inventory (McCulloch et al. [1999])
Wetlands 48 Varner et al. [1999]
Emission distributions for northern and southern hemisphere
N-H
0
20
40
60
80
100
120
140
1 2 3 4 5 6 7 8 9 10 11 12
Month
Em
issi
on
s (G
g)
S-H
0
20
40
60
80
100
120
140
1 2 3 4 5 6 7 8 9 10 11 12
Month
Em
issi
on
s (G
g)
ocbbanbgsmwtGEIA_ oc
Annual net oceanic flux
Calculated GEIA Inventory
I-a) Concentration comparison between observations and model at six surface stations (1/2)
I-a) Concentration comparison between observations and model at six surface stations (2/2)
II) Vertical profile comparison between observations and model
II) Vertical profile comparison: observations VS. model (1/7)
II) Vertical profile comparison: observations VS. model (2/7)
II) Vertical profile comparison: observations VS. model (3/7)
II) Vertical profile comparison: observations VS. model (4/7)
II) Vertical profile comparison: observations VS. model (5/7)
II) Vertical profile comparison: observations VS. model (6/7)
II) Vertical profile comparison: observations VS. model (7/7)
II) Vertical profile comparison between observations and model
III-a) Latitude-altitude concentration distributions: observations VS. model for TRACE-P region (east)
III-a) Latitude-altitude concentration distributions: observations VS. model for TRACE-P region (east)
III-a) Latitude-altitude concentration distributions: comparisons of biomass burning and biogenic CH3Cl to background concentrations
for TRACE-P region (east)
IV-a) Correlation CH3OH VS. CH3Cl for TRACE-P (east)
III-b) Latitude-altitude concentration distributions: observations VS. model for TRACE-P region (west)
III-b) Latitude-altitude concentration distributions: observations VS. model for TRACE-P region (west)
III-b) Latitude-altitude concentration distributions: comparisons of biomass burning and biogenic CH3Cl to background concentrations
for TRACE-P region (west)
Global Simulation of CH2O
GOME SEP 1996
GEOS-CHME SEP 1997
GEOS-CHEM (inactive OH) without Biogenic emissions
STD Inactive OH Inact. OH w/o 3-body rxn
NO
NO2
PRPE
Regional Simulations
RCTM GEOS-CHEM
• MM5 data assimilation at 70x70km, 20 layers (up to 14 km), and 5 min time step output
• Grell scheme with mid-level downdraft
• Lightning NOx parameterization by Allen et al. [2000] and Pickering et al. [1998]
• The same chemical module as GEOS-CHEM
• DAO data assimilation (GEOS-3) at 4°x5°, 48 layers (to 80 km), and 6-hour time step output
• Full O3-NOx-HC chemistry with 24 tracers and 120 species [Bey et al., 2001]
• Provides initial and boundary trace gas conditions for RCTM
500 mb