how do regional aerosol emissions affect climate? matthew kasoar with: apostolos voulgarakis...
DESCRIPTION
SO 2, BC SO 2 SO 2, BCTRANSCRIPT
How do regional aerosol emissions affect climate?
Matthew Kasoar
With: Apostolos Voulgarakis (Imperial), Drew Shindell (NASA GISS/Duke), Greg Faluvegi (NASA GISS), Jean-Francois Lamarque (NCAR), and Dill
Shawki (Imperial)
SO2, BCSO2 SO2, BCSO2, BC
SO2
BC
N96L85 configuration (1.875°x1.25°, 85 levels up to 85km)1° NEMO oceanCLASSIC aerosol scheme
100/200 year simulations, repeat year 2000 emissionsRemove emission of interest from individual regions
HADGEM3-AOSimulations with
BC vs. SO2
TOA
SWTe
mp
US vs. China SO2
TOA
SWTe
mp
India vs. China SO2
TOA
SWTe
mp
Dynamical changes in above SO2 cases
Similarity in pattern of US and China responses corresponds to similar dynamical structure
Indian SO2 removal produces different pattern
ChinaUS
India
3X AS MANY MODELSInvestigating US and China SO2 removals with
HadGEM31.875° x 1.25°; 85 vertical levels
CESM12.5° x 1.875°; 30 vertical levels
GISS-E22.5° x 2°; 40 vertical levels
HadG
EM3
CESM
1GI
SS-E
2US CHINA
1.57 Tg HadGEM3
1.09 Tg GISS-E2
Differences between HadGEM3 and GISS-E2
SO2 dry deposition: HadGEM3 = 406.2 kg(S)/s GISS-E2 = 1399 kg(S)/s
SO2 dry oxidation: HadGEM3 = 609.3 kg(S)/s GISS-E2 = 681.9 kg(S)/s
SO2 wet removal/oxidation: HadGEM3 = 1419 kg(S)/s GISS-E2 = 742.5 kg(S)/s
0.64 Tg HadGEM3
1.15 Tg GISS-E2
SO2
SO4
Present-day BC effects are negligible compared to SO2 in HadGEM3/CLASSIC
Strong hemisphere-wide response to localised mid-latitude forcing
Mechanism of remote temperature responses
Which model is right?
Substantial model diversity in sensitivity to SO2 emission reductions
Models vary in both aerosol quantity and radiative efficiency
Conclusions
Questions
THANK YOU
EXTRA SLIDES:
AERONET comparison
Biases in aerosol amount explain some of the discrepancies
OBS
HadGEM3GISS-E2
Biases in aerosol amount explain some of the discrepancies
But differences in radiative efficiency as well
AERONET comparison
OBS
CESM1GISS-E2
Map of regionsChina (NCAR/GISS) = 80E-120E, 20N-50NSA = 70E-90E, 10N-30NEA = 105E-145E, 20N-45NUS = 70W-125W, 30N-50NNHML = 30N-60N
SO2, BCSO2 SO2, BCSO2SO2, BC
US vs. EA SO2
TOA
SWTe
mp
India vs. EA SO2
TOA
SWTe
mp