Primary Biological Aerosol Particles: an important part of the global organic aerosol budget?
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Primary Biological Aerosol Particles: an important part of the global organic
aerosol budget?
GEOS-Chem User’s MeetingApril 7, 2009
Colette L. Heald and Dominick V. Spracklen
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FIRST… SOME INTRODUCTIONS
Bonne Ford, graduate student
Gena Renninger, graduate student
Kateryna Lapina, postdoc
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PRIMARY BIOLOGICAL AEROSOL PARTICLES (PBAP)
POLLEN
BACTERIA VIRUSES
FUNGUS
ALGAEPLANTDEBRIS
Jaenicke [2005] suggests may be as large a source as dust/sea salt (1000s Tg/yr)Elbert et al. [2007] suggest emission of fungal spores ~ 50 Tg/yr
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CURRENT SOURCE ESTIMATES FOR ORGANIC AEROSOL (Tg/yr)
WITHOUT PBAP WITH PBAP?
PBAP estimates ~1000 Tg/yr would swamp all other sources of organic aerosol. Fungal spores emissions equivalent to biomass burning?
Budget #’s from GEOS-Chem [Park et al., 2003; Henze et al., 2008]
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PBAP ACROSS THE SIZE RANGE?
1.0E-2
1.0E-1
1.0E+0
1.0E+1
1.0E-1 1.0E+0 1.0E+1 1.0E+2
Diameter d , µm
dV
/dlo
gd, µ
m3 /c
m3
0%20%
40%60%
80%100%120%
140%160%
180%200%
Total
Cellular
Fraction
From Andi Andreae (unpublished data)
Dominates the coarse mode (pollens, debris…)
May also make important contribution
to fine mode aerosol
PM2.5
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GEOS-CHEM SIMULATION OF FUNGAL SPORE PBAP
Constant EmissionOptimized Emission = f(LAI, H2O)
VAST improvement for fine PBAP: capture variability, unbiased simulationMODEST improvement for coarse PBAP: relatively unbiased, but other drivers?
I. Identify tracer to test simulation: Mannitol is a unique tracer for fungal spores [Bauer et al., 2008; Elbert et al., 2007]
1 pg mannitol = 38 pg OM*
II. First-guess: constant emissions from Elbert et al. [2007], with 20% in fine mode
III. Optimize emissions: Test meteorological drivers to reproduce observed variability
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WHERE ARE FUNGAL SPORES AN IMPORTANT SOURCE OF ORGANIC AEROSOL?
Generally contribute ~10% to fine mode surface OA, but > 30% in tropics
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WHEN ARE FUNGAL SPORES AN IMPORTANT SOURCE OF ORGANIC AEROSOL?
Pronounced seasonality in extratropics (corresponding to
vegetation cover), peaking in late-summer/fall as in measurements.
Taiwan
Hyytiala
[Sousa et al., 2008]
[Ho et al., 2005]
unpublished data, Hanna Manninen
Porto, Portugal
GEOS-Chem simulation
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CONCLUSION
Next up: implications for CCN (using GLOMAP model…)
Fungal spores make a modest, but regionally important contribution to organic carbon aerosol budget. More observations needed to test…
What about other PBAP types?
FINE OA SOURCES COARSE OA SOURCE
(Tg yr-1) (Tg yr-1)
[Heald and Spracklen, GRL, in press]