![Page 1: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/1.jpg)
TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested on 10 years of SCIAMACHY's 2.3 μm measurementsTobias Borsdorff, Joost aan de Brugh, Paul Tol, Ilse Aben, Jochen Landgraf
Netherlands Institute for Space Research (SRON)
![Page 2: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/2.jpg)
Spectral mean signal relative to 11 Jan. 2003.
SCIAMACHY’s daily sun measurements
![Page 3: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/3.jpg)
The need for a reflectance retrieval
R=μ
0
π ⋅I Earth
I Sun
S i(t)=α(t)βi(t)S i(t0)+ϵi(t)
The need for a reflectance retrieval
![Page 4: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/4.jpg)
(grey, e.g. gloudemans et al.,2008)
A wider CO retrieval window
![Page 5: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/5.jpg)
Signal to noise of SCIAMACHY spectra
Mean (2003-2012)
![Page 6: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/6.jpg)
Radiometric offset correction
F (x ,a)=F (x)+∑i=0
n=3
a(i ) p i(λ)
Sahara
Australia
![Page 7: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/7.jpg)
Error of clear sky retrievals
![Page 8: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/8.jpg)
Error of cloud contaminated retrievals
CAK[1]
Borsdorff, T., Hasekamp, O. P., Wassmann, A., and Landgraf, J.: Insights into Tikhonov regularization: application to trace gas column retrieval and the efficient calculation of total column averaging kernels, Atmos. Meas. Tech., 7, 523-535, doi:10.5194/amt-7-523-2014, 2014.
![Page 9: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/9.jpg)
Validation: SCIAMACHY vs. NDACC/IRWG
NDACC (pink)SCIAMACHY (black)
47.42N
67.84N
![Page 10: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/10.jpg)
Validation: SCIAMACHY vs. TCCON
TCCON (blue)SCIAMACHY (black)
45.95N
-12.43S
![Page 11: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/11.jpg)
Validation: bias (SCIAMACHY - FTIR)
![Page 12: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/12.jpg)
Data usage: spatial resolution
Mean (2003-2012)
cylindrical equal area projection (nlat=180, nlon=360)
![Page 13: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/13.jpg)
Data usage: temporal resolution
30-day medians
![Page 14: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/14.jpg)
TROPOMI: single overpass over china
CO column [1018 molec cm-2]
![Page 15: TROPOMI's CO retrieval code for the Sentinel 5 Precursor ...seom.esa.int/atmos2015/files/presentation27.pdf · TROPOMI's CO retrieval code for the Sentinel 5 Precursor mission tested](https://reader033.vdocuments.net/reader033/viewer/2022042915/5f51c178170ab97eaf217152/html5/thumbnails/15.jpg)
Summary and conclusions
● TROPOMI CO retrieval code performs good on real data:
– good agreement with TCCON (0.1 ± 7.5 ppb).
– bias with NDACC/IRWG (-8.9 ± 8.3 ppb)
– good agreement with TM5 over Africa
● Next: TROPOMI cloud retrieval with SCIAMACHY spectra
● Now available: full mission SCIAMACHY CO dataset
(cloud free scenes over land)
Image: ESA
© Astrium