CALIPSO Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations
What satellite and aircraft observations can tell us about the organic aerosol budget
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Transcript of What satellite and aircraft observations can tell us about the organic aerosol budget
What satellite and aircraft observations can tell us about the organic aerosol budget
Colette L. Heald
5th International GEOS-Chem MeetingMay 2, 2011
Acknowledgments: David Ridley, Easan Drury, Sonia Kreidenweis,
Hugh Coe, Matthew Jolleys, Jose Jimenez, Rodney Weber, Roya Bahreini, Ann Middlebrook, Lynn Russell, Armin Wisthaler, Thomas Karl, Jennifer Murphy, Joost de Gouw, Carsten Warneke
FIRST… SOME INTRODUCTIONS
Bonne Ford, graduate studentPoster: Tuesday
Luke Schiferl, graduate student
Kateryna Lapina, PostdocTalk: next!
Dave Ridley, PostdocTalk: after lunch
Maria Val MartinResearch Scientist
just joined group!
CAN SATELLITE OBSERVATIONS SHED ANY LIGHT ON THE BUDGET OF OA?
SURFACE REFLECTANCE
Bottom-up calculations suggest that SOA source may be anywhere from 140-910 TgC/yr [Goldstein and Galbally, 2007].
topz
0
AOD= α RH z M z dz
Organicaerosol
Sulfate Dust
Sea SaltNitrate
SATELLITE AOD
Assumptions:Optical PropertiesSize Distributions
Aerosol Distributions
AEROSOL SPECIATED MASS CONCENTRATIONS
Soot
ATTRIBUTE ENTIRE MODEL UNDERESTIMATE OF AOD TO ORGANICS
Estimate that ~150 TgC/yr source is required to close the
MISR-GEOS-Chem* discrepancy.
DJF JJA
MISR
GEOS-Chem*
MISR-GEOS-Chem*
*excluding OA (v8-02-04)
This is more than THREE TIMES what is currently included in global models….
BUT at the low end of Goldstein & Gallbally [2007] range.
HAVE WE REDUCED THE UNCERTAINTY ON THE OA BUDGET?
910
47 Existing GEOS-Chem sources
140 Our satellite top-down estimate 150
Range estimated
by: Goldstein
and Galbally [2007]
All units in TgCyr-1
[Heald et al., 2010]
DIGGING IN DEEPER: 17 AIRCRAFT FIELD CAMPAIGNS
* All AMS measurements, except ITCT-2K4 (PILS) and ACE-Asia (filters).
2001-2009
Aircraft constraints on the organic aerosol distribution through depth of troposphere in remote, polluted and fire influenced regions.
COMPARISON OF VERTICAL PROFILE
GEOS-Chem: v8-03-01 with GEOS-5 met product (GEOS-4 for ACE-Asia only), simulations matched to year and location of aircraft, standard POA, BSOA and ASOA.
OVERALL COMPARISON OF OA SIMULATION
In median observations range from 0.45-4.5 of simulated. Difference is largest close to source.
CAN WE ATTRIBUTE THE MODEL
UNDERESTIMATE?
Adding ~100 Tg/yr source of ASOA (as suggested by Spracklen et al., 2011)
improves comparison in polluted regions, but leads to too much OA aloft and in
remote regions.OA sink?
Higher volatility OA?
[Heald et al., in prep]