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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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slide1
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)

slide3
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.

slide4
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?

slide5
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/)

slide6
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/)

slide7
(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

slide8
SENSITIVITY OF ARCTIC BC LOADING TO FOSSIL FUEL EMISSIONS

April 2001

SURFACE

~950-850 hPa

~750-400 hPa

~300-150 hPa

slide9
SENSITIVITY OF ARCTIC BC LOADING TO BIOMASS BURNING EMISSIONS

April 2001

SURFACE

~950-850 hPa

~750-400 hPa

~300-150 hPa

slide10
(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

slide11
SENSITIVITY OF ARCTIC BC LOADING TO EMISSIONS

July 2001

Fossil Fuel

SURFACE

~750-400 hPa

SURFACE

~750-400 hPa

Biomass burning

slide13
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.

slide14
INITIAL SPREAD INDEX AND MODELED EMISSIONS FOR ALASKA

EMISSIONS

GOES

FIRE COUNTS

ISI

PRECIP

RH

WIND

T

slide15
GEOS Precipitation Alaska GPCP Precipitation

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

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