Space-based Constraints on VOC Emissions in the Pearl River Delta

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1 Christopher Chan Miller 7th International GEOS-Chem Meeting 5//15 Thanks to Daniel Jacob, Kelly Chance and Gonzalo Gonzalaz-Abad! Space-based Constraints on VOC Emissions in the Pearl River Delta

2 Glyoxal: A new product! 9 o N o N 3 o N o 3 o S o S Glyoxal (CHOCHO) 9 o S 1 o 15 o W o W 9 o W o W 3 o W o 3 o E o E 9 o E o E 15 o E 1 o New algorithm - columns are lower than previous satellite retrievals 9 o N o N 3 o N o <..... > CHOCHO and HCHO are products of VOC oxidation 3 o S o S HCHO 9 o S 1 o 15 o W o W 9 o W o W 3 o W o 3 o E o E 9 o E o E 15 o E 1 o < > Chan Miller et al. (15) Gonzalez Abad et al. (15)

3 The PRD is the Earth s Glyoxal Volano Glyoxal Column (-7 Average) PRD 7oE oe 9oE 1oE 11oE oe 13oE oe 15oE Column Density ( 1 molecules cm- ) < > PRD CHOCHO enhancement x larger than elsewhere in China

4 The PRD is the Earth s Glyoxal Volano HCHO Column! (-7 Average) PRD 7oE oe 9oE 1oE 11oE oe 13oE oe 15oE Column Density ( 115 molecules cm- ) < > HCHO levels are comparable to other Chinese hotspots

5 The PRD is the Earth s Glyoxal Volano NO Column! (-7 Average) o N o N o N o N o PRD N o os 7oE oe 9oE 1oE 11oE oe 13oE oe 15oE Column Density ( 115 molecules cm- ) < > NO levels are comparable NOto other Chinese hotspots

6 CHOCHO and HCHO have different VOC signatures! Estimated Production Rate High Resolution PRD Emission Inventory Zheng et al. (9) MCM YIELDS Aromatics AROMATICS Alkenes ALKENES Biogenics BIOGENICS Alkanes ALKANES Carbonyls CARBONYLS Alcohols ALCOHOLS Aromatics AROMATICS ALKENES Alkenes Biogenics BIOGENICS ALKANES Alkanes Carbonyls CARBONYLS ALCOHOLS Alcohols CHOCHO Molar Yield CHOCHO Production Rate (Gmol yr -1 ) HCHO Molar Yield HCHO Production Rate (Gmol yr -1 )

7 Deriving the PRD Glyoxal Source Time evolution of the PRD glyoxal plume WIND Integrate Across Trajectories Line Density (1 1 molecules cm -1 )

8 Time evolution of the PRD glyoxal plume WIND Integrate Across Trajectories Line Density (1 1 molecules cm -1 ) 1 Toluene Benzene Emission E i VOC i OH Yield: y i CHOCHO OH, hν High resolution PRD inventory evaluated against with 1D plume model

9 Other inventories are inconsistent with observed plume PRD High Res. REASv. RETRO CHOCHO Line Density (1 1 molecules cm -1 ) 1 Toluene Benzene Line Density (1 1 molecules cm -1 ) 1 Line Density (1 1 molecules cm -1 ) HCHO Line Density (1 1 molecules cm -1 ) 1 C Alkanes C3 Alkenes Line Density (1 1 molecules cm -1 ) 1 Line Density (1 1 molecules cm -1 )

10 Other inventories are inconsistent with observed plume PRD High Res. REASv. RETRO CHOCHO Line Density (1 1 molecules cm -1 ) 1 Toluene Benzene Line Density (1 1 molecules cm -1 ) 1 Line Density (1 1 molecules cm -1 ) HCHO Line Density (1 1 molecules cm -1 ) 1 C Alkanes C3 Alkenes Line Density (1 1 molecules cm -1 ) 1 Line Density (1 1 molecules cm -1 ) High REAS Toluene not supported by downwind CHOCHO concentrations

11 Other inventories are inconsistent with observed plume PRD High Res. REASv. RETRO CHOCHO Line Density (1 1 molecules cm -1 ) 1 Toluene Benzene Line Density (1 1 molecules cm -1 ) 1 Line Density (1 1 molecules cm -1 ) HCHO Line Density (1 1 molecules cm -1 ) 1 C Alkanes C3 Alkenes Line Density (1 1 molecules cm -1 ) 1 Line Density (1 1 molecules cm -1 ) High REAS Toluene not supported by downwind CHOCHO concentrations RETRO underestimates VOC emissions

12 RETRO underestimates are not limited to the PRD Glyoxal Column (-7 Average) GEOS-Chem (w/ RETRO) - GEOS-Chem differences support underestimated aromatic emissions Toluene Emissions RETRO INTEX-B REAS Emissions inventories have been revising aromatic emissions upwards over time 5 Gmol/yr.9 Gmol/yr.9 Gmol/yr Pulles (7) Zhang (9) Kurukawa ()

13 Inventory aromatic fluxes are converging with satellite CHOCHO INTEX-B/SCIAMACHY! AROMATIC SCALING PRD Plume (/REASv) Decreased Columns Increased emissions Line Density (1 molecules cm-1) SCIAMACHY Liu et al. () REAS INTEX-B RETRO