ch 4 total columns from sciamachy comparison with atmospheric models
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CH 4 TOTAL COLUMNS FROM SCIAMACHY – COMPARISON WITH ATMOSPHERIC MODELS. P. Bergamaschi 1 , C. Frankenberg 2 , J.F. Meirink 3 , M. Krol 1 , F. Dentener 1 , M. van Weele 3 ,T. Wagner 2 , U. Platt 2 , S. Koerner 4 , M. Heimann 4 ,.

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ch 4 total columns from sciamachy comparison with atmospheric models
CH4 TOTAL COLUMNS FROM SCIAMACHY – COMPARISON WITH ATMOSPHERIC MODELS

P. Bergamaschi1, C. Frankenberg2, J.F. Meirink3, M. Krol1, F. Dentener1, M. van Weele3,T. Wagner2, U. Platt2, S. Koerner4, M. Heimann4,

1European Commission Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy

2Institute for Environmental Physics, University of Heidelberg, Heidelberg, Germany

3Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands

4Max Planck Institute for Biogeochemistry, Jena, Germany

ICDC7, Boulder, 26-30 September 2005

sciamachy
SCIAMACHY

absorption spectra of solar radiation (near-IR)

-> high sensitivity also towards the surface

Main challenge:

Target precision / accuray ~ 1%

ICDC7, Boulder, 26-30 September 2005

sciamachy validation
SCIAMACHY - validation

ground based FTIR (total column measurements)

NDSC network

- very few stations (~11) only; no coverage of tropical source regions

- FTIR precision (~3%), accuracy (~7%) [Dils et al., 2005]

comparison with other satellites

currently no other CH4 retrievals available

(except some exploratory retrievals from IMG/ADEOS (1997)

alternative approach:

inverse modelling

using high precision / accuracy surface insitu / flask measurements (DCH4 ~ 0.1%)

-> global 3D CH4 fields

ICDC7, Boulder, 26-30 September 2005

model validation
model - validation

opposite view:

validation of models (and bottom-up emission inventories)

in particular over source regions which are not well sampled by the surface measurements

Final objective:

Better quantification of CH4 emissions

ICDC7, Boulder, 26-30 September 2005

tm5 model
TM5 model

TM5 model – atmospheric zoom model

  • offline atmospheric transport model
  • meteo from ECMWF
  • global simulation 3o x 2o
  • zooming 1o x 1o (North America, South America, Europe, Africa, Asia, Australia)
  • http://www.phys.uu.nl/~tm5/
  • [Krol et al., 2005]

ICDC7, Boulder, 26-30 September 2005

tm5 simulations inversion based on groundbased monitoring sites
TM5 simulationsinversion based on groundbased monitoring sites

synthesis inversion optimizing:

- monthly emissions

- 11 source categories

- 7 global regions for wetlands

- 5 global regions for biomass burning

ground based background monitoring sites (NOAA/CMDL)

ICDC7, Boulder, 26-30 September 2005

tm5 inverse simulations examples for some monitoring sites
TM5 inverse simulationsexamples for some monitoring sites

01 Jan

31 Dec

simulation of global CH4 consistent with surface monitoring sites (background sites)

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 global
SCIAMACHY vs. TM5 - global

SCIA

TM5

2003 average

column averaged CH4 [ppb]

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 global1
SCIAMACHY vs. TM5 - global

SCIA

TM5

N-S gradient ~100 ppb

consistent between SCIA and TM5

2003 average

column averaged CH4 [ppb]

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 global2
SCIAMACHY vs. TM5 - global

SCIA

TM5

Enhanced CH4 over SouthEast Asia and tropical regions (S.America, Africa)

2003 average

column averaged CH4 [ppb]

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 asia 04 06 2003
SCIAMACHY vs. TM5 - Asia 04-06 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 asia 07 09 2003
SCIAMACHY vs. TM5 - Asia 07-09 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 asia 10 12 2003
SCIAMACHY vs. TM5 - Asia 10-12 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 south america 01 03 2003
SCIAMACHY vs. TM5 - South America 01-03 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 south america 04 06 2003
SCIAMACHY vs. TM5 - South America 04-06 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 south america 07 09 2003
SCIAMACHY vs. TM5 - South America 07-09 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 south america 10 12 2003
SCIAMACHY vs. TM5 - South America 10-12 2003

SCIA

TM5

ICDC7, Boulder, 26-30 September 2005

south america 01 03 2003 jk
South America 01-03 2003 JK

SCIA

TM5

CH4 emission from wetlands: J. Kaplan [2005]

spatial distribution of wetlands based on GLC2000

ICDC7, Boulder, 26-30 September 2005

south america 01 03 2003 bw
South America 01-03 2003 BW

SCIA

TM5

CH4 emission from wetlands: Walter et al. [2001]

spatial distribution of wetlands based on [Matthews and Fung, 1987]

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 global std bias
SCIAMACHY vs. TM5: global std, bias

daily SCIA retrievals vs. TM5 (global over land)

std

bias

ICDC7, Boulder, 26-30 September 2005

conclusions
Conclusions
  • SCIAMACHY provides view on globalCH4 distribution
  • Enhanced CH4 over SouthEast Asia, and tropical regions of South America and Africa (DCH4 up to ~70 ppb)
  • Comparison with inverse simulations, optimized towards insitu observations:
  • Background regions: reference for validation of SCIAMACHY retrievals
  • Source regions: Different model scenarios yield significantly different CH4 distributions -> rather check of consistency than strict validation
  • major uncertainty: CH4 emissions from wetlands
  • overall std: 23.6 ppb (1.4%) - upper estimate of SCIA precision
  • potential (seasonal) bias (in particular over Australia (~20 ppb))
  • average N-S gradient (~100 ppb) consistent between SCIAMACHY and TM5

ICDC7, Boulder, 26-30 September 2005

thank you
Thank you !

ICDC7, Boulder, 26-30 September 2005

supporting material
Supporting Material

ICDC7, Boulder, 26-30 September 2005

sciamachy envisat
SCIAMACHY / ENVISAT

SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY)

altitude: 800 km

14 orbits per day

full global coverage: every 6 days

CH4: 1563-1585 nm

CO2: 1631-1670 nm

(O2: 760 nm)

SCIAMACHY on ENVISAT

ICDC7, Boulder, 26-30 September 2005

sciamachy vcd vmr
SCIAMACHY VCD->VMR

Conversion

vertical column densities (V) [molec / cm2]

-> column averaged mixing ratios (VMR) [ppb]

use of CO2 instead of O2 for determination of total vertical column of dry air [Frankenberg et al., Science, 2005]

-> very similar light path distribution (scattering)

variability of total columns:

DCO2 ~ 1/3 DCH4

CO2 VMR from TM3

column averaged CH4 mixing ratio [ppb]

ICDC7, Boulder, 26-30 September 2005

sciamachy averaging kernels
SCIAMACHY - averaging kernels

[Frankenberg et al., 2005]

ICDC7, Boulder, 26-30 September 2005

sciamachy vs tm5 global incl ocean
SCIAMACHY vs. TM5 - global (incl. ocean)

ICDC7, Boulder, 26-30 September 2005

emission inventories for tm5 simulations
emission inventories for TM5 simulations

bottom-up emission inventories used as priori emissions for inverse TM5 simulations:

ICDC7, Boulder, 26-30 September 2005

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