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Comparing Models of NO x Chemistry in Asia. Tracey Holloway, Columbia University MICS-Asia Workshop 2001. Acknowledgements. Hiram Levy II, NOAA GFDL Greg Carmichael, University of Iowa Markus Amann and TAP Project, IIASA Meredith Galanter, Larry Horowitz, Mahesh Phadnis

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comparing models of no x chemistry in asia
Comparing Models of NOx Chemistry in Asia

Tracey Holloway, Columbia University

MICS-Asia Workshop 2001

acknowledgements
Acknowledgements
  • Hiram Levy II, NOAA GFDL
  • Greg Carmichael, University of Iowa
  • Markus Amann and TAP Project, IIASA
  • Meredith Galanter, Larry Horowitz, Mahesh Phadnis
  • Support from DoD, NASA, Princeton Univ., GFDL
outline
Outline
  • Model Overview
  • Comparing with Observations
  • Regional Lagrangian vs.

Global Eulerian

  • ATMOS-N Results
atmos model overview
Lagrangian, forward

1o x 1o resolution

NCEP winds (1990)

NCEP precipitation

Vertical motion by “puff splitting”

Linear chemistry only, non-interacting puffs

ATMOS: Model Overview
atmos n model chemistry
ATMOS-N Model Chemistry

Fossil Fuel, Biomass Burning, Biogenic

fossil fuel emissions in asia
Fossil Fuel Emissions in Asia

kTon NO2/grid-yr

(IIASA, Van Ardenne)

model vs observations i
Model vs. Observations, I

Annual Wet HNO3 Deposition (mg N/m2-yr)

Observations from Dentener and Crutzen, 1994

model vs observations ii
Model vs. Observations, II

Annual Wet HNO3 Deposition (mg N/m2-yr)

Observations from Fujita et al., 2000

model vs aircraft obs
Model vs. Aircraft Obs

Tropical W. Pac.

Mid-lat. W. Pac.

ATMOS

OBS

GFDL GCTM

Sept.-Oct.

Feb.-Mar.

gctm model overview
Global, Eulerian

11 vertical layers, variable resolution ~2.5o x 2.5o at mid-latitutes

GCM-generated winds/precipitation, “typical” year

Off-line chemistry—same scheme as ATMOS

GCTM: Model Overview
gctm vs atmos n
GCTM vs. ATMOS-N

Global, Eulerian

Regional, Lagrangian

Annual Wet HNO3 Deposition (meq/m2-yr)

atmos n vs gctm at sites
ATMOS-N vs. GCTM, at sites

ATMOS

OBS

GFDL GCTM

Both models too low in wet HNO3 deposition, but ATMOS lower.

atmos n vs gctm hno 3
ATMOS-N vs. GCTM, [HNO3]

Surface

Free Trop.

(~685 mb)

summary model evaluation
Overall correct “ballpark” but…

Wet HNO3 deposition too low vs. obs

Disagreement greatest at “downwind” sites

Upper Trop. NOx too low in summer

Although GCTM is also too low in wet HNO3 deposition, ATMOS-N is lower

Not enough lateral spreading

Too much dry deposition

… All trace back to the vertical transport in ATMOS-N…

Summary: Model Evaluation
china impacts
China Impacts

Winter

Summer

% wet HNO3 deposition due to fossil fuel emissions in China relative to all Asia fossil fuel emissions

india impacts
India Impacts

Winter

Summer

japan impacts
Japan Impacts

Winter

Summer

relative nitrate burden
Relative Nitrate Burden

Total= Total S + Total NO3- (meq/m2/yr)

% NO3-

summary regional transfer of hno 3
Summary: Regional Transfer of HNO3
  • Significant Transfer within east Asia, and from India to west China
  • China contributes 18% to total nitrate deposition (wet + dry) in Japan, 46% to North Korea, 26% to South Korea
  • Most exchange in winter, when winds are stronger, precipitation less
  • NOx much more localized due to shorter lifetime
  • Nitrate contributes 30-50% of total acidification over much of Japan, but less than 20% over much of east China.
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