MAX-DOAS observations of NO 2 in NDACC: status and perspectives
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1 MAX-DOAS observations of NO 2 in NDACC: status and perspectives F. Hendrick 31/01/2015 C. Gielen, G. Pinardi, B. Langerock, M. De Mazière, and M. Van Roozendael Royal Belgian Institute for Space Aeronomy (BIRA-IASB) + NDACC UV-vis Working Group 1
2 Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) Measures the absorption of sunlight scattered by molecules and aerosols in the UV-visible range Off-axis viewing directions + zenith: Typical elevation angles: 0, 1, 2, 3, 6, 8, 10, 12, 15, 30, and 90 Measurements from ~85 SZA sunrise to 85 SZA sunset ~20 minutes per scan sza 31/01/2015 Scattering Stratosphere * Troposphere Zenith Spectrometer Ground * Off-axis GAW N-cycle Workshop, University of York, UK, 13 April elevation 2
3 MAX-DOAS System Optical head including telescope on a suntracker Two grating spectrometers (UV + visible) Controlling and acquisition unit GAW N-cycle Workshop, University of York, UK, 13 April
4 MAX-DOAS retrieval Two-step method: 1. Spectral inversion giving the slant column densities (SCDs): ' I( ) ' ( ) ln ( ). SCD( ) ' I0( ) 2. Vertical column and/or profile retrieval from SCDs: VCD(,, ) SCD(,, ) AMF(,, ) GAW N-cycle Workshop, University of York, UK, 13 April
5 MAX-DOAS horizontal representativeness 360 nm 450 nm 560 nm MAD-CAT intercomparison campaign (June-July 2013; MPIC/Mainz) Mainz (MPIC), 17 June 2013 Ortega et al., AMT, 2015 MAX-DOAS and satellite nadir air quality measurements are sensitive to similar spatial domain (e.g., OMI and TROPOMI pixel sizes: 13 x 24 and 3.5 x 7 km 2, respectively) MAX-DOAS suitable for satellite nadir air quality instrument validation
6 NDACC-related MAXDOAS stations (Network for the Detection of Atmospheric Composition Change) International research network of ~90 remote sensing stations (Dobson/Brewer, FTIR, LIDAR, MW, sondes, UV-vis) Contributor to the GAW programme Main objective: Observing and understanding the physical/chemical state of the stratosphere and troposphere Plays a key role for trend studies, ground truthing of satellite data, model assessment MAX-DOAS systems and algorithms are still under development, generally operated at scientific level by expert scientists GAW N-cycle Workshop, University of York, UK, 13 April Harmonisation efforts under progress (started in 2011 with the FP7 project NORS)
7 Model validation: CAMS C-IFS (global) OHP (Southern France) Rural 27/01/2015 Xianghe (Beijing suburban area) suburban/ Highly polluted 31/01/2015 Uccle (Brussels) Urban/ Polluted 7
8 Model validation: CAMS Regional Model Ensemble (LOTOS-EUROS, CHIMERE, EMEP, EMEP-MACCEVA, SILAM, MOCAGE) Bremen (Germany)-2011 Uccle (Brussels)-2012 OHP (Southern France)-2010 Urban Urban Rural Correlation plots 27/01/2015 Seasonal variation Bremen (Germany) Uccle (Brussels) OHP (Southern France) 31/01/2015 Vertical profiles Bremen (Germany) Uccle (Brussels) OHP (Southern France) Courtesy A. Blechschmidt (IUP- Bremen) + CAMS regional model team + IUP-Bremen and BIRA-IASB MAX-DOAS teams 8
9 Satellite NO 2 validation using MAX-DOAS About 20 MAX-DOAS stations have been used to validate tropospheric NO 2 from nadir satellite sensors (OMI/AURA, GOME-2/METOP-A): SATELLITE MAXDOAS VCD tropo = (SCD total AMF strato VCD strato )/AMF tropo Pixels (cloud fraction<20%) falling within 50km around the stations, MAX-DOAS interpolated at the satellite overpass time GAW N-cycle Workshop, University of York, UK, 13 April
10 OMI (TEMIS) versus MAX-DOAS Overpass time: 13h30 Suburban and Remote Urban sites Validation results strongly depend on the location of the station, with generally smaller satellite columns than the ground-based MAX-DOAS. - Good agreement in suburban and remote stations - Urban conditions: MAX-DOAS is generally higher than satellite impact of local pollution sources, not adequately sampled at the coarse resolution of the pixel 10
11 MAX-DOAS versus in-situ at Uccle (Brussels) 25/07/ B km 41R012 + MAX-DOAS 17/07/
12 Nitrous acid (HONO) from MAX-DOAS CAS/IAP (06/ /2009) H O N O NO 2 Hendrick et al., ACP, 2014 (03/2010 till now ) A O D 14
13 Nitrous acid (HONO) from MAX-DOAS Hendrick et al., ACP,
14 MAX-DOAS harmonisation: FP7 project NORS ( ) Perform the required research and developments to optimize the NDACC data products for the purpose of supporting the quality assessments of CAMS MAX-DOAS data harmonisation (NO 2, HCHO, aerosols): retrieval algorithms and settings, uncertainties, spatial representativeness, cloud flagging, data reporting (GEOMS hdf format), etc NRT (24h latency) data submission to the RD database: ftp://ftp.cpc.ncep.noaa.gov/ndacc/rd/ NORS validation server: 16
15 Perspectives: Centralised Processing System ( ) Stations: Ny-Alesund, Bremen, Cabauw, Uccle, Mainz, Heidelberg, Xianghe, Athens, Bujumbura, Lauder, Neumayer 17
16 Final remarks MAX-DOAS instruments are currently monitoring tropospheric NO 2 yearround at ~50 sites worldwide (urban, suburban, and remote conditions) HONO can be measured for high NO x and aerosols emissions MAX-DOAS provides vertical column + information on the vertical distribution (especially the surface concentration) Suitable correlative data for satellite nadir air quality instrument validation Could be used as a link between in-situ air quality networks and satellite data Harmonisation efforts currently under progress (FP7 projects NORS, QA4ECV, ESA project FRM 4 DOAS, CINDI-II campaign) Updated NDACC data policy We are currently aiming at integrating (MAX)DOAS in ACTRIS RI. 18
17 Acknowledgements 21
18 Back-up slides 22
19 DOAS fit NO 2 in Beijing Ma et al., ACP,
20 MAX-DOAS data format homogeneisation Clear-sky, thin clouds, thick clouds, broken clouds 4 GEOMS templates (off-axis trace gas + aerosols, zenith, and directsun; see AVDC at 24
21 GOME-2A (DLR GDP4.8) versus MAX-DOAS Overpass time: 9h30 Suburban and Remote Urban sites Validation results strongly depend on the location of the station, with generally smaller satellite columns than the ground-based MAX-DOAS. - Good agreement in suburban and remote stations - Urban conditions: MAX-DOAS is generally higher than satellite impact of local pollution sources, not adequately sampled at the coarse resolution of the pixel 25
MAX-DOAS observations of NO 2 in NDACC: status and perspectives
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