biogenic emissions from tropical ecosystems
DESCRIPTION
Biogenic emissions from tropical ecosystems. Michael Barkley & Paul Palmer University of Edinburgh. HCHO August 2006 (Ozone Monitoring Instrument). biogenic, pryogenic, anthropogenic. biogenic anthropogenic. biogenic anthropogenic. pryogenic anthropogenic. pyrogenic anthropogenic. - PowerPoint PPT PresentationTRANSCRIPT
Biogenic emissions from tropical ecosystemsMichael Barkley & Paul
PalmerUniversity of Edinburgh
biogenic, pryogenic, anthropogenic
pryogenicanthropogenic
biogenicanthropogenic
pryogenicpyrogenicanthropogenic
biogenicanthropogenic
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anHCHO August 2006 (Ozone Monitoring Instrument)
Isoprene is the main driver of variability in ΩHCHO
(Palmer et al., JGR, 2003,2006) i
iiHCHO
HCHO Eyk
1Ω
Inverting HCHO columns for isoprene emissions GOME
slant columns (July 96)
Instrumentsensitivity w(s)(“scattering weight”)
Vertical shapefactor S(s)(normalized mixing ratio)
what GOMEsees
1
0
( ) ( )GAMF AMF w S d
Apply AMF
Inverting HCHO columns for isoprene emissions GOME
slant columns (July 96)
GOME vertical columns (July 96)
VCD = SCD / AMF
GOME slant columns (July 96)
GOME vertical columns (July 96)
Apply AMF
ΩHCHO=SEisop+B
Model Transfer Function
GOME slant columns (July 96)
GOME vertical columns (July 96)
Apply AMF
ΩHCHO=SEisop+B
Eisop~ (ΩHCHO-B) / S
Model Transfer Function
GOME slant columns (July 96)
GOME vertical columns (July 96)
GOME isopreneemission inventory
Apply AMF
ΩHCHO=SEisop+B
Eisop~ (ΩHCHO-B) / S
Model Transfer Function
The tropics: GOME observations: Jan-June 1997
Plots smoothed with 3x3 box-car filter!
The tropics: GOME observations: July-Dec 1997
Plots smoothed with 3x3 box-car filter!
Significant pyrogenic HCHO source
Plots smoothed with 3x3 box-car filter!
Grey diamonds = fires detected by ATSR
Partition Amazon into West & East regions
Plots smoothed with 3x3 box-car filter!
East region: Contribution of wild fires
Biomass burning is the main source of HCHO
Maximum in dry season
Partition Amazon into West & East regions
Plots smoothed with 3x3 box-car filter!
Isolate West Amazonian + remove fires
Plots smoothed with 3x3 box-car filter!
5 yr time series over western Amazonian
5 yr time series over western Amazonian
Transport of biomass burning ?
Water availability
In situ isoprene data @ 2.8°S, 59.4 ° W (Trostdorf et al., ACPD, 2004)
Yr = 2002 Rainfall
Plots smoothed with 3x3 box-car filter!
August 2001
Tropics: GEOS-CHEM 3 vs. GEOS-CHEM 4
GOME VCDs: July-Dec 1997
Plots smoothed with 3x3 box-car filter!
Plots smoothed with 3x3 box-car filter!
GEOS-CHEM v4 VCDs: July-Dec 1997
Hmm?
GEOS 4 GEOS 3
August 2001
Environmental factors affecting isoprene emissions: • temperature (exponential dependn)• solar irradiance• leaf area index• leaf age
T2M TS
T2M TS
4-3
4-3
GEOS 4 GEOS 3
Initial emission estimates: using GEOS-CHEM 3
Plots smoothed with 3x3 box-car filter!
9.90 TgC 8.01 TgC 15.98 TgC
9.01 TgC 9.26 TgC 11.91 TgC
GOME
MEGAN
GOME
MEGAN
GOME
MEGAN
Contribution of other VOCS ?
• Mean hourly VOC emissions 1-13 June 2006 in northern Benin ~9.3°S, 1.4°W (Data from African Monsoon Multidisciplinary campaign)
• Future work: Use Master Chemical Mechanism (MCM) to estimate time-dependent production of HCHO from limonene
Summary
• GOME & OMI HCHO columns– Have the potential to help improve our
understanding of isoprene in tropical regions & better quantify isoprene emission inventories
• GEOS-CHEM 4 very high HCHO columns over tropics– Welcome thoughts & suggestions
• Can produce initial estimates (using GEOS-CHEM 3)– Separate out pyrogenic component– Identify contributions of other VOCs (e.g.
limonene)
Further Discussion
Linear Regressions for 2001
GEOS-CHEM 3 vs. GEOS-CHEM 4
GEOS-CHEM 3
GEOS-CHEM 3 vs. GEOS-CHEM 4
GEOS-CHEM 4
GEOS-CHEM 3 vs. GEOS-CHEM 4
GEOS-CHEM 3
GEOS-CHEM 3 vs. GEOS-CHEM 4
GEOS-CHEM 4
Control Run No biomass burning
No biomass burning or biofuel No biomass burning, biofuel or biogenics
The End !