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Retrieval of CHOCHO using observations from the IUPB and BOKU MAX-DOAS instruments Stefan F. Schreier 1 Andreas Richter 2 , Enno Peters 2 , Mareike Ostendorf 2 , André Seyler 2 , Tim Bösch 2 , Folkard Wittrock 2 Mihalis Vrekoussis 3 1 Institute of Meteorology, University of Natural Resources and Life Sciences, Vienna, Austria 2 Institute of Environmental Physics, University of Bremen, Bremen, Germany 3 Laboratory for Modeling and Observation of the Earth System, University of Bremen, Germany CINDI-2 Workshop in Mutters, Austria, 15.03.2018

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Page 1: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

Retrieval of CHOCHO using observations from the IUPB and BOKU MAX-DOAS instruments

Stefan F. Schreier1 Andreas Richter2, Enno Peters2, Mareike Ostendorf2, André Seyler2, Tim Bösch2, Folkard Wittrock2

Mihalis Vrekoussis3

1Institute of Meteorology, University of Natural Resources and Life Sciences, Vienna, Austria 2Institute of Environmental Physics, University of Bremen, Bremen, Germany

3Laboratory for Modeling and Observation of the Earth System, University of Bremen, Germany

CINDI-2 Workshop in Mutters, Austria, 15.03.2018

Page 2: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

2

Instrument Characterization

BOKU (CINDI-2.06) IUPB (CINDI-2.18)

Measurement period 7 Sep - 28 Sep 8 Sep - 29 Sep

Spectrometer

Acton Standard Series SP-2356

Acton ARC500

Wavelength range

FOV

Spectral resolution

418-553 nm

0.8°

0.75 nm

407-579 nm

0.8°

0.8 nm

Detector PIX100B-SF-Q-F-A Princeton NTE/CCD-1340/400-EMB

(-60°C) (-30°C)

Azimuth File-character

287 / zenith _

287 S

355 T

45 U

95 V

145 W

195 X

245 Y

287 / horizon Z

almucantar A

30° test R

dark N

Page 3: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

3

CHOCHO retrieval settings / examples

Fit parameter Selection/Source

Spectral range 433-458 nm

Polynomial Order 5

Wavelength calibration Solar atlas (Kurucz et al., 1984)

Reference Sequential zenith spectrum

Cross section Temp. Data source

O3 223 K Serdyuchenko et al. (2014) (I0 corr.)

NO2

298 K

220 K

Vandaele et al. (1998) (I0 corr.)

Vandaele et al. (1998) (I0 corr.)

O4

CHOCHO

293 K

296 K

Thalman and Volkamer (2013)

Volkamer et al. (2005)

H2O 296 K Rothmann et al. (2010)

Ring - QDOAS

BOKU IUPB

- consistent fit residuals

- overall good agreement for glyoxal

- IUPB CHOCHO is 10-15%

higher than BOKU CHOCHO

- for NO2, only about 5% relative difference

Page 4: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

4

Slant column intercomparison (time series)

BOKU IUPB

- good agreement for the lowest elevation angles

- BOKU glyoxal is more smooth

- scatter increases with increasing elevation angles, in particular for the IUPB instrument

- IUPB glyoxal shows many negative values for EA = 30°

Page 5: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

5

Slant column intercomparison (scatter plots)

- high correlation coefficients for the lowest elevation angles

- IUPB glyoxal always higher than BOKU glyoxal

- for EA = 15° and 30°, agreement is not good anymore

Page 6: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

6

Slant column intercomparison (scatter plots)

- much better agreement for NO2 in the same fitting window (no surprise)

- however, higher NO2 values are observed by the BOKU instrument, excpet for EA = 30°

- highest correlation

is found for the larger elevation angles (in contrast to glyoxal)

Page 7: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

7

Slant column intercomparison (average diurnal cycle)

BOKU IUPB

- very stable CHOCHO levels throughout the day

- CHOCHO amounts rise in the afternoon and reach a maximum before sun rise

- BOKU CHOCHO measurements show larger (smaller) values for the standard deviation for the lower (higher) directions

Page 8: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

8

Slant column intercomparison (average diurnal cycle)

CHOCHO

BOKU IUPB

NO2

BOKU IUPB

AA = 287°

Page 9: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

9

Vertical column intercomparison (time series)

𝑽𝑪𝑫 (𝑪𝑯𝑶𝑪𝑯𝑶, 𝑯𝑪𝑯𝑶) =𝑫𝑺𝑪𝑫 (𝑪𝑯𝑶𝑪𝑯𝑶, 𝑯𝑪𝑯𝑶) 𝜶

𝟏𝒔𝒊𝒏 (α)

− 𝟏

Geomteric approach:

α = 30° α = 15°

BOKU instrument

IUPB instrument

RGF

𝑅𝐺𝐹 =𝐶𝐻𝑂𝐶𝐻𝑂

𝐻𝐶𝐻𝑂

Page 10: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

10

Diurnal cycles of VCD CHOCHO

13.9.2016 14.9.2016

- distinct diurnal variation of CHOCHO for all azimuth angles

- overall, low day-to-day variability for most directions, except for directions T (355°) and X (195°)

- highest daily CHOCHO averages are found at direction W (135°)

--> up to factor 1.5 larger than at other directions

Page 11: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

11

Diurnal cycles of VCD NO2

13.9.2016 14.9.2016

- distinct diurnal variation also observed for NO2

- larger day-to-day

variability (anthropogenic emissions?)

- higher horizontal variability of NO2 amounts on 14.9.

Page 12: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

12

Diurnal cycles of VCD HCHO

13.9.2016 14.9.2016

- distinct diurnal variation also observed for HCHO

- lower day-to-day

variability and also lower horizontal variability

- overall, smoothest curves, when compared with the other two trace gases

- least affected by anthropogenic emissions?

Page 13: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

13

VCD CHOCHO vs. VCD HCHO and VCD NO2

- data from all azimuth directions

- only 13.9. and 14.9. are included

- data only from direction S (287°)

- but for all days

Page 14: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

14

RGF vs. VCD NO2

13.9.2016 14.9.2016

- positive correlation between RGF and VCD NO2, which is in agreement with ground-based studies and in disagreement with satellite-based studies

- overall better correlation between RGF and VCD NO2 on 14.9. (because of higher NO2 amounts?)

Page 15: Retrieval of CHOCHO using observations from the IUPB and ...€¦ · Acton ARC500 Wavelength range FOV Spectral resolution 418-553 nm 0.8° 0.75 nm 407-579 nm 0.8° 0.8 nm Detector

15

Summary

Overall, the two instruments compare well with each other and the agreement for CHOCHO is good

Better agreement is found for the lower elevation angles (decreasing signal-to-noise ratio, in particular for the IUPB instrument)

The IUPB instrument observes higher CHOCHO values than the BOKU instrument, while the opposite is found for NO2

Conversion of DSCDs into VCDs works better for 15° than for 30° measurements (better signal-to-noise ratio for 15°)

For CHOCHO, but also for HCHO and NO2, distinct diurnal cycles are found on 13.9. and 14.9. (cloud-free and unusually hot days)

While the day-to-day variability is highest for NO2, the horizontal variability is highest for CHOCHO

Low correlation between CHOCHO and NO2 on those two days suggests that glyoxal amounts are not dominated by anthropogenic emission sources


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