LONG-RANGE TRANSPORT OF BLACK CARBON TO THE ARCTIC REGION
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LONG-RANGE TRANSPORT OF BLACK CARBON TO THE ARCTIC REGION. Qinbin Li 1 , Daven Henze 2 , Yang Chen 1 , Evan Lyons 3 , Jim Randerson 3. 1 JPL 2 Caltech 3 UC Irvine. work supported by JPL/NASA.

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LONG-RANGE TRANSPORT OF BLACK CARBON TO THE ARCTIC REGION

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Long range transport of black carbon to the arctic region

LONG-RANGE TRANSPORT OF BLACK CARBON TO THE ARCTIC REGION

Qinbin Li1, Daven Henze2, Yang Chen1, Evan Lyons3, Jim Randerson3

1JPL 2Caltech 3UC Irvine

work supported by JPL/NASA


Arctic research of the composition of the troposphere from aircraft and satellites arctas

Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS)

ARCTAS

ARCTAS to be conducted in spring and summer 2008 (two phases)

as part of the POLARCAT program during the International Polar Year (IPY)


Long range transport of black carbon to the arctic region

EXPORT OF BC FROM ASIA: GEOS-3 vs. GEOS-4

Monthly BC profiles [124-140°E, 30-40°N]

Vertical distributions of BC during TRACE-P

GEOS-3

TRACE-P OBS.

GEOS-4

Park et al. [2005]

TRACE-P OBS.

STRONGER EXPORT OF BC IN THE FREE TROPOSPHERE WITH GEOS-Chem DRIVEN BY GEOS4 MET DATA.


Long range transport of black carbon to the arctic region

MEASUREMENTS OF BC IN HIGH-LATITUDES

Long-term measurements of BC:

- Alert (62.8ºW, 82.7ºN) mBC , ap (Aethalometer, PSAP)

- Barrow (156.6ºE, 71.3ºN) ap (PSAP)

- Ny Ålesund (11.9ºE, 78.9ºN) AOD (sun photometer)

How well does the model simulate BC in northern high-latitudes?


Long range transport of black carbon to the arctic region

BC @ ALERT (62.8ºW, 82.7ºN)

Green - CMDL obs.

Blue - GC w/ GEOS-3

Red - GC w/ GEOS-4

need to filter out contamination

  • BC component of the spring ‘Arctic Haze’ is significantly underestimated in the model. Better agreements for the summer months.

  • Little difference between the two model simulations driven by GEOS-3 vs. GEOS-4.

Data from World Data Center for Aerosols (http://wdca.jrc.it/)


Long range transport of black carbon to the arctic region

BC @ BARROW (156.6ºE, 71.3ºN)

Green - CMDL obs.

Blue - GC w/ GEOS-3

Red - GC w/ GEOS-4

Mass absorption efficiency - 10 m2/g

  • Underestimate of BC in ‘Arctic Haze’.

  • High BC levels from biomass burning in summer seen in both model results and (limited) observations.

  • Model results with GEOS-4 met. data show substantially higher BC values vs. those w/ GEOS-3 met. data.

Data from CMDL (ftp.cmdl.noaa.gov/aerosol/)


Long range transport of black carbon to the arctic region

(ADJOINT) SENSITIVITY OF ARCTIC TROPOSPHERIC

(70-90°N, 800-400 hPa) BC LOADING TO EMISSIONS

April 2001

DOMINANT INFLUENCE FROM EUROPEAN AND ASIA (CHINA) FOSSIL FUEL EMISSIONS.

SENTIVITY

BC EMISSIONS


Long range transport of black carbon to the arctic region

SENSITIVITY OF ARCTIC BC LOADING TO FOSSIL FUEL EMISSIONS

April 2001

SURFACE

~950-850 hPa

~750-400 hPa

~300-150 hPa


Long range transport of black carbon to the arctic region

SENSITIVITY OF ARCTIC BC LOADING TO BIOMASS BURNING EMISSIONS

April 2001

SURFACE

~950-850 hPa

~750-400 hPa

~300-150 hPa


Long range transport of black carbon to the arctic region

(ADJOINT) SENSITIVITY OF ARCTIC TROPOSPHERIC

(70-90°N, 800-400 hPa) BC LOADING TO EMISSIONS

July 2001

DOMINANT INFLUENCE FROM BOREAL FOREST FIRE AND EUROPEAN FOSSIL FUEL EMISSIONS.

SENTIVITY

BC EMISSIONS


Long range transport of black carbon to the arctic region

SENSITIVITY OF ARCTIC BC LOADING TO EMISSIONS

July 2001

Fossil Fuel

SURFACE

~750-400 hPa

SURFACE

~750-400 hPa

Biomass burning


Long range transport of black carbon to the arctic region

DIURNAL CYCLE OF BIOMASS BURNING


Long range transport of black carbon to the arctic region

TRANSPORT OF BOREAL FOREST FIRE BC EMISSIONS: effects of including (fire) diurnal cycle

BC AOD with 8-day GFED emissions

including diurnal cycle

BC AOD with monthly GFED emissions

Including diurnal cycle of fires results in less efficient transport of boreal forest fire emissions in Alaska while more efficient in southern Africa.


Long range transport of black carbon to the arctic region

INITIAL SPREAD INDEX AND MODELED EMISSIONS FOR ALASKA

EMISSIONS

GOES

FIRE COUNTS

ISI

PRECIP

RH

WIND

T


Long range transport of black carbon to the arctic region

GEOS Precipitation Alaska GPCP Precipitation

Red: ISI modeled emissions, Green: GFED, Black: GOES


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