Simulation of GEOS-Chem with HTAP inventory : Evaluation

Duseong S. Jo and Rokjin J. Park

Seoul National University

23 MAY 2014 MICS-ASIA/HTAP workshop

Model GEOS-Chem v9.1.3

Meteorological field MERRA reanalysis product

Resolution 2° latitude X 2.5° longitude X 47 vertical layers up to 0.01 hpa

Emissions Anthropogenic : HTAPv2.1 inventory (SO2, NOx, NMVOC*, CO, NH3, BC and OC)

Biomass burning : GFEDv3 (monthly)

DMS : Lana et al. (2011)

Volcano SO2 : AeroCom inventory

Biogenic : MEGAN v2.1

Global 3-hourly timeseries files provided by SNU Can download 3-hourly global timeseries files in

ftp://presto.snu.ac.kr/pub/SNU_GEOS_Chem_v9.1.3/ ID : anonymous

*We used the NMVOC speciation of GEOS-Chem native inventory but scaled the total NMVOC emission to that of HTAPv2 emission.

Global 3-hourly timeseries files provided by SNU Can download 3-hourly global timeseries files in

ftp://presto.snu.ac.kr/pub/SNU_GEOS_Chem_v9.1.3/ ID : anonymous

NAME Description

BASE Base run (CH4 : 1798 ppbv)

GLOINC 20% anthropogenic emission decrease in the globe

GLODEC 20% anthropogenic emission increase in the globe

EASDEC 20% anthropogenic emission decrease in East Asia

NAMDEC 20% anthropogenic emission decrease in North America

EURDEC 20% anthropogenic emission decrease in Europe

CH4INC Global CH4 concentration of 2121 ppbv

CH4DEC Global CH4 concentration of 1562 ppbv

Evaluation against WOUDC

Ozone evaluation against climatological WOUDC observation

500 hpa 800 hpa SFC

(Kim et al., 2013 in 6th GEOS-Chem meeting)

Slope ~ 1 R2 > 0.5

Evaluation against EANET Evaluation period : 2010 Time resolution : Month

Ozone and NOx

[ppbv]

Ozone NOx

(Jeong and Park, 2013)

GEOS-Chem does not capture low concentration of ozone in both case

GEOS-Chem significantly underestimates NOx

concentration especially for urban region

Ozone and NOx

[ppbv]

Ozone NOx

(Jeong and Park, 2013)

GEOS-Chem does not capture low concentration of ozone in both case

GEOS-Chem significantly underestimates NOx

concentration especially for urban region

SO4, NH4, and NO3 (Annual) SO4 NH4 NO3

[µg m-3]

(Jeong and Park, 2013)

SO4, NH4, and NO3 (Annual vs. Monthly) SO4 NH4 NO3

Simulation ability : Annual mean comparison > Monthly mean comparison

[µg m-3]

Evaluation for the United States: against CASTNET (ozone) and

IMPROVE(aerosol)

Ozone Period : 2008~2010 Time resolution : Month

CASTNET

MO

DE

L

[ppbv]

All season

Coefficient of determination is low in terms of retrieving monthly variation of ozone

GEOS-Chem (global model) has a weakness in reproducing night-time PBL

Performance : MDA8 > 24hr averaged ozone

JJA

CASTNET

MO

DEL

(Zhang et al., 2013)

Carbonaceous aerosols BC (EC) OC

[µgC/m3]

(Park et al., 2006)

Inorganic aerosols (Annual mean)

SO4 NO3

[µg/m3]

GEOS-Chem with HTAP emission overestimates inorganic aerosol concentration observed by IMPROVE network

DJF

MAM

JJA

SON

SO4 NO3

(Heald et al., 2012)

Inorganic aerosols (Seasonal mean)

DJF

MAM

JJA

SON

SO4

(Heald et al., 2012)

[TgN(S) yr-1]

HTAPv2 BASE:2010

Heald et al, BASE:2004

NOx 5.0 5.8

SOx 6.1 6.7

NH3 3.5 2.2

(Granier et al., 2010)

Inorganic aerosols (Seasonal mean)

NMVOC speciation HTAP provides only for total NMVOC emissions and does not have speciation information. We used the NMVOC speciation of GEOS-Chem native inventory but scaled the total NMVOC emission to that of HTAP emission.

NMVOC speciation HTAP provides only for total NMVOC emissions and does not have speciation information. We used the NMVOC speciation of GEOS-Chem native inventory but scaled the total NMVOC emission to that of HTAP emission.

GEOS-Chem (Full chemistry

simulation with SOA)

RETRO

Species [TgC] [Tg] [Tg] Species Name

ALK4 32.55 39.33 30.29

Butanes(9.33) + Pentanes(9.96) + Hexanes_and_higher_alkanes(11.00)

MEK 3.51 5.26 5.84 total_ketones PRPE 2.35 2.74 2.74 propene C3H8 2.88 3.52 3.66 propane CH2O 0.46 1.16 1.17 formaldehyde C2H6 4.09 5.11 5.26 ethane ALD2 0.93 1.71 2.65 other_aldehydes BENZ 3.21 3.48 3.50 benzene TOLU 5.60 6.13 6.45 toluene XYLE 4.76 5.25 5.56 xylene C2H2 2.50 acetylene C2H4 6.48 ethene

HCOOH 9.51 total_acids 4.99 esters 3.65 ethers

23.81 other_VOCs 3.42 other_aromatics 8.93 total_alcohols 1.17 trimethylbenzene

Total 60.3 73.7 131.6 Total HTAP NMVOC total : 143 Tg

GEOS-Chem NMVOC emissions are based on RETRO emissions

GEOS-Chem does not treat all NMVOC tracers which are included in RETRO emissions

ALK4 fraction GEOS-Chem : 32.55/60.3 54% RETRO : 30.29/131.6 23%

NMVOC speciation HTAP provides only for total NMVOC emissions and does not have speciation information. We used the NMVOC speciation of GEOS-Chem native inventory but scaled the total NMVOC emission to that of HTAP emission.

GEOS-Chem (Full chemistry

simulation with SOA)

RETRO

Species [TgC] [Tg] [Tg] Species Name

ALK4 32.55 39.33 30.29

Butanes(9.33) + Pentanes(9.96) + Hexanes_and_higher_alkanes(11.00)

MEK 3.51 5.26 5.84 total_ketones PRPE 2.35 2.74 2.74 propene C3H8 2.88 3.52 3.66 propane CH2O 0.46 1.16 1.17 formaldehyde C2H6 4.09 5.11 5.26 ethane ALD2 0.93 1.71 2.65 other_aldehydes BENZ 3.21 3.48 3.50 benzene TOLU 5.60 6.13 6.45 toluene XYLE 4.76 5.25 5.56 xylene C2H2 2.50 acetylene C2H4 6.48 ethene

HCOOH 9.51 total_acids 4.99 esters 3.65 ethers

23.81 other_VOCs 3.42 other_aromatics 8.93 total_alcohols 1.17 trimethylbenzene

Total 60.3 73.7 131.6 Total HTAP NMVOC total : 143 Tg

0.23

0.04 0.02 0.03 0.01 0.04 0.01 0.03 0.05 0.04 0.02 0.05 0.01 0.04 0.03 0.18 0.03 0.07 0.01 1.00

GEOS-Chem NMVOC emissions are based on RETRO emissions

GEOS-Chem does not treat all NMVOC tracers which are included in RETRO emissions

ALK4 fraction GEOS-Chem : 32.55/60.3 54% RETRO : 30.29/131.6 23%

We further simulated the

NMVOC concentrations using emission speciation factors retrieved by RETRO inventory

Global annual benzene concentrations

HTAP (Default) HTAP

(New speciation with RETRO)

NMVOC concentrations are greatly decreased in the simulation of HTAP inventory with RETRO NMVOC speciation factor

Global annual ozone concentrations HTAP (Default)

HTAP (New speciation with RETRO)

Diff. (New-Default)

In case of ozone, there is no big difference between the model results.

Maximum difference ~7ppbv

Ozone evaluation against climatological WOUDC observation

500 hpa 800 hpa SFC (1)

(2)

Ozone (CASTNET and EANET)

CASTNET

[ppbv]

CASTNET

MO

DEL

(1) GEOS-Chem native

MO

DEL

M

OD

EL

MO

DEL

M

OD

EL

(2) RETRO speciation

CASTNET

EANET