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Pandora Data https://avdc.gsfc.nasa.gov/pub/DSCOVR/Pandora/Web_Pandora/

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Presentation on theme: "Pandora Data https://avdc.gsfc.nasa.gov/pub/DSCOVR/Pandora/Web_Pandora/"— Presentation transcript:

1 Pandora Data

2

3

4 Level 3B NOT Filtered

5 Level 3C Filtered

6 Pandora Measured Diurnal Variation of Formaldehyde
And NO2 NO2 and HCHO measurements in Korea from 2012 to 2016 from Pandora Spectrometer Instruments compared with OMI retrievals and with aircraft measurements during the KORUS-AQ campaign Jay Herman1, Elena Spinei2, Alan Fried3, Jhoon Kim4, Jae Kim5, Woogyung Kim3,Alexander Cede6,Nader Abuhassan1, Michal Segal-Rozenhaimer7,8, AMT, 2018

7 Talking Points Conventional LEO satellites miss the important diurnal variation. Underestimates health effects. We need GEO Coincident satellite data underestimates amounts of NO2 and HCHO. Affects tropospheric chemsitry models Main reason in polluted regions is the large satellite FOV Aircraft profile data also underestimates total column HCHO Satellite Error sources for NO2 or HCHO: 1) AMF 2) Surface Reflectivity 3) selection of spectral window Satellite Bias: Large FOV

8 The Effect of Clouds on NO2 Retrieval
Difference within ± 0.05 DU

9 NO2 Diurnal Variation Seoul Olympic Park Gwangju Busan Anmyeondo
Taewha

10 NO2: Compare Pandora with OMI
Difference mostly due to different FOV 13 x 24 km2 for OMI Distance < 20 km for most points

11 Comparison of Pandora HCHO Measurements with DC8 CAMS
Compact Atmospheric Multispecies Spectrometer (CAMS) (Richter et al., 2015) 4 May 2016 Olympic Park Korea CAMS CAMS HCHO altitude profile measured onboard the DC8 on 4 May at 07:54 (A) and 11:54 (B) local time over Olympic Park, Korea. Panel C: PSI measurements of C(HCHO). Vertical bars mark the DC8 flight duration for the profiles yielding altitude integrated column amounts of 0.38 and 0.26 DU.

12 Comparison of Pandora Measurements with DC8 CAMS
Compact Atmospheric Multispecies Spectrometer (CAMS) (Richter et al., 2015) 5 June 2016 Olympic Park Korea CAMS CAMS HCHO altitude profile measured onboard the DC8 on 5 June at 8:30 (A) and 15:21 (B) local time over Olympic Park, Korea. Panel C: PSI measurements of total column HCHO. Vertical bars mark the DC8 flight duration for the profiles yielding column amounts of 0.60 and 0.82 DU.

13 HCHO from Pandora at Yonsei University
Total column HCHO from Pandora Yonsei University, Seoul for 6 days in June C(HCHO) on 2 June 2016 has a peak value of 1.2 DU at 13:30 hours. Total column HCHO from Pandora Taehwa Mountain for 6 days in June C(HCHO) on 2 June 2016 has a peak value of 1.7 DU at 16:20.

14 HCHO Frequency of Occurrence
Summary of total column HCHO for the stated dates during the KORUS-AQ campaign. The solid line is a Lowess(0.1) fit to the data. The sharp cutoffs in panel A, B, and C were caused obstructions of the direct sun from the PSI FOV in the afternoon.

15 HCHO Frequency of Occurrence
Summary of total column HCHO for the stated dates during the KORUS-AQ campaign. Panels A and B represent the daily variation at a given local time. The solid line is a Lowess(0.1) fit to the data. Panels C and D show the frequency of occurrence (%) for different amounts of HCHO.

16 HCHO: Pandora vs OMI Compare PSI • and OMI o retrievals of C(HCHO) at 13.5 ± 0.5 hours

17 Conventional LEO satellites miss the important diurnal variation
Conventional LEO satellites miss the important diurnal variation. Underestimates health effects. We need GEO Coincident satellite data underestimates amounts of NO2 and HCHO. Affects tropospheric chemsitry models Main reason in polluted regions is the large satellite FOV Aircraft profile data also underestimates total column HCHO Satellite Error sources for NO2 or HCHO: 1) AMF 2) Surface Reflectivity 3) selection of spectral window Satellite Bias: Large FOV

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