Transpacific transport of pollution as seen from space Funding: NASA, EPA, EPRI Daniel J. Jacob, Rokjin J. Park, Becky Alexander, T. Duncan Fairlie, Arlene.

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Presentation transcript:

Transpacific transport of pollution as seen from space Funding: NASA, EPA, EPRI Daniel J. Jacob, Rokjin J. Park, Becky Alexander, T. Duncan Fairlie, Arlene M. Fiore, Robert M. Yantosca, the TRACE-P, MOPITT and MODIS Science Teams Colette L. Heald Air Quality Remote Sensing Meeting, Boulder February 22, 2006

Evolution of Pollution (Chemistry + Transport) ground stations Emissions Continuous Point observations Regional survey Suite of chemical species Limited temporally Continuous (daily) Global Coverage Cloud cover Limited Chemical Species Interpretation?X X X OBSERVE TRANSPORT EVENTS AND TEST MODELS AT ALL SCALES Objectives: 1. Evolution 2. Frequency 3. Impacts

OBJECTIVE #1: EVOLUTION (TRANSPORT) CO O3O3 A C B D E Aircraft observations during outbound trans-Pacific TRACE-P (February 2001) flights observed elevated levels of CO (and O 3 )

OBJECTIVE #1: EVOLUTION (CHEMICAL) H Origin: Warm Conveyor Belt over Asia Evolution: Split by blocking high pressure Northern plume (observed at A) sees no O 3 enhancement. Southern plume (observed at D and E) subsides, leads to PAN decomposition and O 3 production ECMWF

OBJECTIVE #1: EVOLUTION AS SEEN BY MOPITT Total column CO Asian pollution exported via cold front Plume encounters a blocking H Pressure System and splits Elevated CO reaches North America Southern branch at low latitudes produces O 3 Feb 23 Feb 24 Feb 25 Feb 26 Feb 27 MOPITT GEOS-CHEM x AvgkerGEOS-CHEM (12 GMT)

OBJECTIVE #2: FREQUENCY OF TRANSPORT EVENTS MOPITT: solid Model: dotted [Heald et al., 2003b] 4 trans-Pacific events reached North America during Spring 2001 (as observed by aircraft, ground stations, MOPITT and simulated in GEOS-Chem)

Clear Day TRANSPACIFIC TRANSPORT OF ASIAN AEROSOLS Most documented cases consist of transport of dust: Despite their short lifetimes, aerosols can be transported across the Pacific and can affect North American air quality standards and visibility. BUT Model simulations suggest that anthropogenic aerosols from Asia can ALSO be transported to the United States [Park et al., 2004] April 16, 2001 Visibility reduction at Glen Canyon, Arizona due to transpacific transport of Asian dust Asian contribution is comparable to “natural” standard set by EPA Haze Rule (0.12 µgm -3 ) IMPACT!

CHALLENGE: OBSERVING AEROSOL COMPOSITION FROM SPACE TO QUANTITAVELY VALIDATE MODELS Carbonaceous aerosols Sulfate Dust Sea Salt Nitrate SURFACE (variable reflectance properties) What we want to validate! SATELLITE AOD Assumptions: Optical Properties Size Distributions Aerosol Distributions etc. A tough measurement to make! AEROSOL SPECIATED MASS CONCENTRATIONS SIMULATED AOD *DIFFERENT* Assumptions: Optical Properties Size Distributions etc. What we are comparing! Better basis for comparison: RADIANCE (Easan Drury, Harvard)

TRANSPACIFIC TRANSPORT OF AEROSOLS (2001) GEOS-CHEM underestimates MODIS observations by factor of ~2 in Spring MODIS = MODerate resolution Imaging Spectroradiometer (launched EOS-Terra Dec 1999) GEOS-Chem = global CTM with coupled oxidant-aerosol simulation [Park et al., 2003; 2004] peak Asian dust ALSO substantial anthropogenic aerosol transport MODIS AOD GEOS-Chem AOD Sulfate AOD Dust AOD

WHAT CAN AERONET OBSERVATIONS TELL US? Is the model/MODIS bias primarily a model underestimate or a satellite retrieval bias? AERONET sites indicate a possible MODIS retrieval bias (not correlated with cloud cover). MODIS AERONET GEOS-CHEM

OBJECTIVE #1: AN EXAMPLE OF TRANSPACIFIC TRANSPORT OF ASIAN AEROSOL POLLUTION AS SEEN BY MODIS April 25, 2001 April 26, 2001 April 27, 2001

OBJECTIVE #3: IMPACT OF ASIAN SULFATE ON U.S. AIR QUALITY Asian aerosols preferentially impact ground sites in the NW US. Observations at IMPROVE sites are elevated from mean when simulated Asian influence is high Simulated Asian NW US: 0.18 μgm -3 Asian events NW US: 0.60 μgm -3 Observed NW US: 0.72 μgm -3 Observed during Asian events NW US: 1.04 μgm -3 [Heald et al., 2006]

Courtesy: Lin Zhang, Harvard OBSERVING INTERCONTINENTAL TRANSPORT FROM SPACE Continuous observation of event evolution, particularly over oceans where ground observations are sparse Monitoring of pollution transport frequency Assess air quality impacts: need high vertical resolution and sensitivity to BL concentrations Characterize chemical evolution: need multiple species observations High density of observations Necessary to track events Low data coverage compromises ability of models to be used for interpretation Interpreting aerosol observations from space: need simultaneous detection of aerosol radiative properties, size distribution and vertical distribution Observational time-scales comparable to species of interest Track O 3 formation/destruction in outflow with continuous obs  geostationary? SUCCESSES CHALLENGES