Aerosol type how to use the information from satellites for models???
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1 Aerosol type how to use the information from satellites for models??? Mian Chin, NASA Goddard Space Flight Center AeroCom/AeroSat workshop, September 2016
2 What does type mean? Satellite Estimated based on characteristics??? Retrieved category (fine, coarse) Retrieved product Source type (anthro., BB, etc. Processes (Chem, transp., removal) Mass composition (SU, NI, BC, OA, DU, SS) Particle size Optical quantities (ext, abs.) Model Input from emi. Data or calc. Directly simulated Assumed or calculated Calculated as function of size, refrac.ind, dry mass, frh) Type? Dust or nondust Polluted or clean Fine or coarse Absorbing or not absorbing
3 Dust AOD from MODIS, MISR, and models Satellite products: MODIS coarse mode fraction, MISR nonspheircal fraction AeroCom models: Dust Kim et al., 2014
4 Pollution (anthropogenic + biomass burning) MODIS-based fossil fuel and biomass burning (FF+BB) AOD: Derived empirically from the MODIS AOD and fine mode fraction, with corrections to exclude fine mode natural dust and marine aerosols (Kaufman et al., 2005; Yu et al., 2009) AeroCom models: AOD from FF and BB source only Chin et al., 2014
5 Total and absorbing aerosols from OMI and GOCART GOCART Δ AERONET OMI SU BC POM Dust Seasalt
6 Model vs. AERONET and OMI vs. AERONET Hmmm Model vs. AERONET OMI vs. AERONET
7 Aerosol type from CALIOP and GOCART Model simulations with sources tagged to group the speciation according to the sources: anthropogenic (sulfate, BC, OC), biomass burning (sulfate, BC, OC), volcanic (sulfate), biogenic (OC), dust, sea salt Type is determined by the highest fraction of aerosol from a particular source
8 _select Aerosol type from CALIOP and GOCART: Example #1 a b c d e f g Best agreement between CALIOP and GOCART aerosol type: Dust Worst agreement: Coastal water CALIOP d e f g Altitude (km) Altitude (km) Altitude (km) CALIOP a b c d e f g 49.97N 32.46E 49.97N 32.46E 36.62N 27.81E 36.62N 27.81E 23.30N 24.31E 23.30N 24.31E 8.71N 21.02E GOCART g4p0e501q0t 8.71N 21.02E 3.38S 18.44E 3.38S 18.44E 16.72S 15.53E a b c d e f g 16.72S 15.53E GOCART all altitudes when ext >= 1 Mm^-1 g4p0e501q0t a b c d e f g 49.97N 32.46E 36.62N 27.81E 23.30N 24.31E 8.71N 21.02E 3.38S 18.44E 16.72S 15.53E 30.00S 12.33E 30.00S 12.33E 30.00S 12.33E 8.71N 21.02E GOCART g4p0e501q0t 3.38S 18.44E 16.72S 15.53E 30.00S 12.33E SM PC PD DU CC CM BV OT
9 t Aerosol type Aerosol type from CALIOP and GOCART: Example #2 a b c d e f g Altitude (km) Altitude (km) Altitude (km) T ZN_select CALIOP a b c d e f g N E N E 23.29N E 9.96N E GOCART g4p0e501q0t 4.43S E 16.69S E a b c d e f g 29.97S E N 36.62N 23.29N 9.96N 4.43S 16.69S 29.97S E E E E E E E GOCART all altitudes when ext >= 1 Mm^-1 g4p0e501q0t 14 a b c d e f g N E 36.62N E 23.29N E 9.96N E 4.43S E 16.69S E a b c d e f g 29.97S E SM PC PD DU CC CM BV OT
10 GOCART CALIOP-like aerosol type near the surface
11 AOD composition MODIS 550 AOD averaged over the 10- year period (Remer et al. 2008). Pie charts show how various aerosol types contribute to the total AOD for different regions, as estimated by a global aerosol model (Myhre et al. 2009). Aerosol types are Sul (sulphate), BC and OC from fossil fuel usage, Bio (OC and BC from biomass burning), Nitrate, Sea (sea salt), and Min (mineral dust). Gray areas indicate lack of MODIS data. Some aerosol types, e.g. sulphate, have enhanced contributions to AOD due to hygroscopic growth. The contribution from OC is likely underestimated as in most of the global aerosol models (Zhang et al. 2007). (Figure from Myhre et al., 2013)
12 Surface Aerosol Composition Fig.7-13 from IPCC AR5 Chapter 7, Clouds and Aerosols, by Boucher et al.
13 Remarks and questions regarding aerosol type How can satellite estimated aerosol types be used to evaluate/ constrain the models? My experience: Dust (or fine/coarse) is the most useful product that can be used quantitatively to evaluate models, but it is only relatively reliable over the ocean Absorbing/non-absorbing is also useful, but data quality needs to be much improved CALIOP-type: Useful information but difficult to quantitatively constrain the models How quantitative the remote sensing derived aerosol type should be in order to be useful? No aerosol specie composition can be retrieved from remote sensing, leaving models unconstrained
14 All models (and satellite retrievals) are wrong, but some are useful
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