Pyro-convective smoke plume observed at ~10 km over British Columbia, June 2004 Vertical transport of surface fire emissions observed from space Siegfried.

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Presentation transcript:

Pyro-convective smoke plume observed at ~10 km over British Columbia, June 2004 Vertical transport of surface fire emissions observed from space Siegfried Gonzi, Paul Palmer Motivation: The height of injection has implications for subsequent pollutant transport Complicated CFD problem We offer a new approach to estimate these heights using measurements of CO from space

We use CO as a tracer for incomplete combustion We use cloud-free data from two instruments aboard the NASA Aura spacecraft (left): Tropospheric Emission Spectrometer (TES) Microwave Limb Sounder (MLS) Over burning scenes, together they are sensitive to changes in CO from the lower troposphere to the lower stratosphere: we get about 2-3 pieces of information.

We extend the traditional surface flux estimation problem Both sides describe the sensitivity of the measured quantity y to changes in surface emissions e We estimate emitted CO mass m in five crude vertical state vector regions from 0–15 km. i = 1 … 5 m i = injected BB mass [kg CO] Averaging kernel

Artificially inject mass into atmosphere over fires Injected mass % in vertical grid-boxes 22.5% 10% LS: 11-15km FT: 8-11 km UFT: 5-8 km LFT: BL – 5km BL: 0 – BL km Altitude [km]  2ºx2.5º GEOS-Chem v driven by GEOS-4 meteorology  8 day GFED v2 BB CO emissions  fossil + bioful emissions: standard GEOS-Chem inventory  prior BB mass injection in the tagged BB CO tracer

(Limited) evaluation of our product: Indonesia, October 2006 Definition injection height: 1)Posterior uncertainty is smaller than prior by 50% 2)Posterior mass is higher than the prior mass 33% pass this criterion; remaining 67% assume boundary layer injection CALIPSO 2 = cloud

Gonzi, GEOS-Chem user meeting 2009 Gfedv2 CO [g CO/m2/JJASO] 2006 JJASO 1785 TES observations (672 colocated with MLS) Statistics of injection heights

Disproportionate impact of large fires: C ptb - C ctrl Longitude [deg] Boreal (42-67 o N)Tropics (0-30 o S) Pressure [hPa] INDO

Concluding remarks  Inferred injection heights agree with GFED BB emissions within 10%.  Injections above the boundary layer are relatively rare (~20%) but result in disproportionate perturbations.  Case studies of injection heights over Siberia (July 2006) and over Indonesia (October 2006) agree well with independent observations.