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MAX-DOAS Measurements in the Canadian High Arctic Xiaoyi Zhao, Cristen Adams, Kimberly Strong University of Toronto Department of Physics July-3-2012 NDACC.

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Presentation on theme: "MAX-DOAS Measurements in the Canadian High Arctic Xiaoyi Zhao, Cristen Adams, Kimberly Strong University of Toronto Department of Physics July-3-2012 NDACC."— Presentation transcript:

1 MAX-DOAS Measurements in the Canadian High Arctic Xiaoyi Zhao, Cristen Adams, Kimberly Strong University of Toronto Department of Physics July-3-2012 NDACC UV-Vis Working Group Meeting at BIRA

2 Outline  Status of PEARL  Instruments upgrades  Research tasks  Data processing  Summary

3 The PEARL at Eureka  Polar Environment Atmospheric Research Laboratory  Formerly Env. Canada’s Arctic Stratospheric Ozone Observatory  Run by the Canadian Network for Detection of Atmospheric Change (CANDAC) since August 2005  ~25 experiments at 3 facilities Located on Ellesmere Island, Nunavut (80°N, 86°W) 15 km from Env. Canada’s Eureka Weather Station 1100 km from North Pole Photo: Dan Weaver

4 2012: A Challenging Spring  February to April – annual ACE Arctic Validation Campaign  Weather was colder than usual at the Ridge Lab for longer than usual (-40 ºC for more than a few days)  Had issues with pipes freezing and rupturing  Difficulty keeping building heated  Blowing snow made it more difficult to keep the road open  On March 18, breaker in main panel failed  Power was shut off and some instruments slowly brought back on-line but limited heating  Breaker was repaired at end of campaign when electrician arrived  April 30 – PEARL ended full-time year-round operations  Efforts continue to find new sources of funding  Current status: no operator on site, automated instruments running with remote access, summer and fall campaigns planned  Will operate on a campaign basis for the immediate future

5 2010-2012 UV-Vis Publications  C. Adams, C. McLinden, K. Strong, and V. Umlenski. Ozone and NO 2 variations measured during the August 1, 2008 solar eclipse above Eureka, Canada with a UV-visible spectrometer. J. Geophys. Res., 115, D19310, doi:10.1029/2010JD014424, 2010.  H. K. Roscoe et al. Intercomparison of slant column measurements of NO 2 and O 4 by MAX-DOAS and zenith-sky UV and visible spectrometers. Atmos. Meas. Tech., 3, 1629-1646, 2010.  A.J. M. Piters, et al. The Cabauw Intercomparison campaign for Nitrogen Dioxide Measuring Instruments (CINDI): design, execution, and early results. Atmos. Meas. Tech. 5, 457-485, 2012.  C. Adams, K. Strong, X. Zhao, M.R. Bassford, M.P. Chipperfield, W. Daffer, J.R. Drummond, E.E. Farahani, W. Feng, A. Fraser, F. Goutail, G. Manney, C.A. McLinden, A. Pazmino, M. Rex, and K.A. Walker. Severe 2011 ozone depletion assessed with 11 years of ozone, NO 2, and OClO measurements at 80°N. Geophys. Res. Lett., 39, L05806, 2012.  C. Adams, K. Strong, R.L. Batchelor, P.F. Bernath, S. Brohede, C. Boone, D. Degenstein, W.H. Daffer, J.R. Drummond, P.F. Fogal, E. Farahani, C. Fayt, A. Fraser, F. Goutail, F. Hendrick, F. Kolonjari, R. Lindenmaier, G. Manney, C.T. McElroy, C.A. McLinden, J. Mendonca, J.-H. Park, B. Pavlovic, A. Pazmino, C. Roth, V. Savastiouk, K.A. Walker, D. Weaver, and X. Zhao. Validation of ACE and OSIRIS ozone and NO 2 measurements using ground-based instruments at 80  N. Atmos. Meas. Tech., 5, 927- 953, 2012.  C. Adams, K. Strong, X. Zhao, A.E. Bourassa, W.H. Daffer, D. Degenstein, J.R. Drummond, E.E. Farahani, A. Fraser, N.D. Lloyd, G.L. Manney, C.A. McLinden, M. Rex, C. Roth, S.E. Strahan, K.A. Walker, and I. Wohltmann. NOx-driven ozone loss and a frozen-in anticyclone observed during the Arctic spring 2011 stratospheric final warming. Submitted to Atmos. Chem. Phys., May 2012.  C. Adams, Measurements of Atmospheric Ozone, NO 2, OClO, and BrO at 80  N Using UV-Visible Spectroscopy, Ph.D. Thesis, University of Toronto, May 2012.

6 Outlook  Long-term operational funding for PEARL is an issue  Pursuing funds from new NSERC Climate Change and Atmospheric Research Program  Funding for students and science is better  Six-year NSERC CREATE Training Program in Arctic Atmospheric Science (2010-2016)  Two more years of CSA support for GOSAT validation (2012-14)  Several smaller NSERC science grants  May have a fall campaign, will be proposing a spring 2013 campaign to the Canadian Space Agency  NDACC data submission  1999-2011 data have been reanalyzed following the NDACC UV-Vis Working Group recommendations. Data will be reorganized and submitted in the next couple of months.

7 Two Instruments UT-GBS (University of Toronto Ground-Based Spectrometer)  Jobin-Yvon Triax-180 triple grating spectrometer  Thermoelectrically cooled CCD detector  Operation indoors using dome  Automated operation (LabView)  History:  Involved in spring field campaigns since 1999 and currently at PEARL  Participated in CINDI 2009 (Roscoe et al., 2010) PEARL-GBS (Polar Environment Atmospheric Research Laboratory GBS)  Nearly identical to UT-GBS  Filter Wheel  History:  Installed permanently at PEARL in August 2006  Installed sun tracker in 2008, enabling MAX-DOAS and direct-sun observations  NDACC certification in January 2009

8 Viewing Geometries UT-GBS  Taking zenith-sky measurements  Using 600 gr/mm grating center at 450 nm (visible) optimized for ozone, NO 2 PEARL-GBS Taking zenith-sky/direct sun/MAX- DOAS alternating measurements Using 1200 gr/mm grating center at 350 nm (UV) optimized for BrO

9 UT-GBS  Input optics upgrade  removed F# matcher  installed AFO-XY fiber mount  changed the telescope lens (change from F#/2.5 to F#/4)  changed the telescope tube  FOV improved from 2° to 0.2°  Slit change (mechanical slit -> fixed slit)

10 PEARL-GBS  Installed new dome mount & dome  Lowest elevation angle improved from 8° to 6°  Upgraded software (SynerJY1.8.5 -> SynerJY3.5)  Labview code has been modified for the upgrade

11 Remote Power Control Plan UT-GBS Sundog PC UPS PEARL- GBS Moondog PC Trax PC Tracker UPS ibootbar Input AInput B

12 Research Tasks Cooling system Depolarization: 3 m long fiber/ mode mixing box

13 Polarization Cristen Adams Platt, U. & Stutz, J.

14 Research Tasks Viewing geometry: -180° Az measurement, negative elevation angle measurement Data analysis: NDACC NO 2 AMF LUT, daily reference -> individual scanning reference

15 Research Tasks Profile retrievals: Stratosphere, troposphere Other research sources: DMPs (Derived Metrological Products), backward trajectory analysis, sea ice age data Data comparison: Brewer spectrometers, the York University Tropospheric Ozone Lidar, OSIRIS, OMI …

16 Figure 2: PEARL-GBS MAX-DOAS BrO DSCDs from day 75 to 82 (upper three panels) and 87 to 95 (lower three panels), in 2011. DSCDs retrieved from different elevation angles (8°, 10°, 15, 30°, °45 and 90°) are shown in different colors. ‘BrO RMS’ means the root mean square of the BrO DOAS fits. O 4 DSCDs retrieved from BrO DOAS fits are also shown. Preliminary MAX-DOAS DSCD Results (Single Daily Reference, 2011)

17 Figure 2: PEARL-GBS MAX-DOAS BrO DSCDs from day 75 to 82 (upper three panels) and 87 to 95 (lower three panels), in 2011. DSCDs retrieved from different elevation angles (8°, 10°, 15, 30°, °45 and 90°) are shown in different colors. ‘BrO RMS’ means the root mean square of the BrO DOAS fits. O 4 DSCDs retrieved from BrO DOAS fits are also shown. Preliminary MAX-DOAS DSCD Results (Single Daily Reference, 2011)

18 MAX-DOAS BrO with Individual Scanning Reference (2011 Campaign)

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20 MAX-DOAS BrO with Individual Scanning Reference (2012 Campaign)

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22 New NDACC NO 2 AMFs

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24 Summary  PEARL stopped its annual operation, but we still have campaign based operation and GBSs are continually taking measurements at PEARL without operator onsite  Both GBSs performed well during 2012 spring campaign  Instrumentation and viewing geometry upgrades are planned for the future  Preliminary MAX-DOAS DSCDs  Differences observed between VCDs retrieved with new AMF LUTs compared with old version.”

25 Acknowledgements We gratefully acknowledge support from the following groups: PEARL/CANDAC  ARIF, AIF/NSRIT, CFCAS, CFI, CSA, EC, GOC-IPY, INAC, NSERC, NSTP, OIT, ORF, PCSP, SEARCH ACE Arctic Campaigns  Co-PI Kaley Walker  CSA, EC, NSERC, NSTP Logistical and operational support at Eureka  The wonderful team at the EC Weather Station  CANDAC/PEARL PI James R Drummond  PEARL site manager Pierre Fogal  The CANDAC operators BIRA-IASB  Thanks to M. Van Roozendael and F. Hendrick provide us NDACC NO 2 AMFs LUT v1_0  Thanks to Caroline Fayt provide us QDOAS2.0

26 Thank you ! xizhao@atmosp.physics.utoronto.ca

27 MAX-DOAS BrO 2011  Day 95Elevation angle = 6°SZA = 75.5 °

28 MAX-DOAS BrO 2012  Day 116Elevation angle = 5°SZA =67.3 °


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