mag: f.m. breon, h. dolman, g. ehret, p. flamant, n. gruber, s. houweling, m. scholze, r.t. menzies...
TRANSCRIPT
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MAG: F.M. Breon, H. Dolman, G. Ehret, P. Flamant,N. Gruber, S. Houweling, M. Scholze, R.T. Menziesand P. Ingmann (ESA)
A-Scope Measuring CO2 Using a space-based Lidar
A-SCOPE: F. M. Breon, H. Dolman, G. Ehret, P. Flamant, N. Gruber, S. Houweling, M. Scholze, R.T. Menzies and P. Ingmann (MAG)
ASCENDS: P. Rayner
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Outline• Introduction: Active remote sensing
• A-SCOPE
• ASCENDS
• Instrument Requirements
• Prospects for launch
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Measurement methods:1. Passive: Thermal IR
• e.g. AIRS, IASI
• Information on vertical profile
• But, low sensitivity to the surface
• Application: T retrieval (ECMWF)
AIRS CO2, July - August 2003
Tiwari et al, JGR, 2006
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Measurement methods:2. Passive: Short Wave IR
• e.g. Sciamachy, OCO, GOSAT
• Sensitive to the PBL
• Aim: Estimation of CO2
sources & sinks
• Critical: Aerosols, thin clouds
SCIAMACHY CO2, July - October
ppm Buchwitz et al, ACP, 2007
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Measurement methods:3. Active: Diff. Absorption Lidar
• Carries own light source (laser)
• Day + night time measurements
• Always nadir (glint, high lats)
• Detects aerosols, thin clouds
DIAL
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Wavelength selection
H2O
CO2
onoff
• Low T sensitivity
• Low contribution
H2O
• Line wing = High surface
sensitivity
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Aerosol correction 1; Passive
• Problem: Optical path
• Solution: measure CO2 & O2, wide wavelength range
• Determine CO2/O2 + aerosol parameters
Sciamachy CO2
Houweling et al., ACP, 2005
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Aerosol correction 2; Active
• Solution: pulsed laser
• Select surface echo from pulse delay time
• Potentially: use aerosol echo for CO2 vertical profile
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A-SCOPE
• Pulsed Laser CO2 (1.6 or 2.0 micron)
• Altimeter: Vegetation vertical distribution
• Aerosols & clouds
Among the 6 ESA Earth explorer missions (Phase 0) Launch (if succesful): ~2015
Proposed instrument:
Note: ECMWF(H2O, T, p) needed for conversion to XCO2
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Canopy Lidar
Harding & Carabajal (GRL, 2005)
Can
op
y heig
ht d
istribu
tion
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ASCENDS
• CO2 (1.6 micron), O2 (0.76 micron)
• CW laser (not pulsed)
Proposed instrument:
Status: No call yet but: US Decadal Survey: 2013 - 2016
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A-SCOPE: Accuracy requirements
• Target requirement on surface flux estimation (level 3):
0.02 PgC/yr over 106 km2
(or ~ 50% of the annual flux)
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Translation to XCO2 (level 2)• Inverse modelling simulations
Required precision:
0.5 - 1.5 ppm
Systematic error:10% of precision
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Performanceestimation
OCO:
DIAL (no pressure broadening):
Chevallier et al., 2007
Rayner, pers. comm.
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Performanceestimation
DIAL, no pressurebroadening:
DIAL, + pressurebroadening:
Rayner, pers. comm.
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Summary
• DIAL: Promising technique for measuring CO2
• Technological challenge
• Will A-Scope fly? => ESA User Consultation Mtg
Granada, Oct. 2008