max-doas measurements in the canadian high arctic
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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 UV-Vis Working Group Meeting at BIRA. Outline. Status of PEARL Instruments upgrades Research tasks Data processing Summary. - PowerPoint PPT PresentationTRANSCRIPT
MAX-DOAS Measurements in the Canadian High Arctic
Xiaoyi Zhao, Cristen Adams, Kimberly StrongUniversity of Toronto
Department of PhysicsJuly-3-2012
NDACC UV-Vis Working Group Meeting at BIRA
Outline
Status of PEARL Instruments upgradesResearch tasksData processingSummary
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
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
2010-2012 UV-Vis Publications C. Adams, C. McLinden, K. Strong, and V. Umlenski. Ozone and NO2 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 NO2 and O4 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, NO2, 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 NO2 measurements using ground-based instruments at 80N. 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, NO2, OClO, and BrO at 80N Using UV-Visible Spectroscopy, Ph.D. Thesis, University of Toronto, May 2012.
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.
Two InstrumentsUT-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
Viewing GeometriesUT-GBS Taking zenith-sky measurements Using 600 gr/mm grating center at
450 nm (visible) optimized for ozone, NO2
PEARL-GBS• Taking zenith-sky/direct sun/MAX-
DOAS alternating measurements• Using 1200 gr/mm grating center
at 350 nm (UV) optimized for BrOElevation
MotorAzimuthal
Motor
Mirror 1
Mirror 2
Sunlight
GBS
Zenith sky
SZA
Elevation angle
Stratosphere
Troposphere
Sun
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)
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
Remote Power Control Plan
UT-GBS Sundog PC
UPS
PEARL-GBS
Moondog PC Trax PCTracker
UPS
ibootbar
Input A Input B
Research Tasks• Cooling system• Depolarization: 3 m long fiber/ mode mixing box
Polarization
Cristen Adams
Platt, U. & Stutz, J.
Circular entrance from telescope
Fiber bundle
Rectangular exit to spectrometer entrance
slit via F/# matcher
Research Tasks• Viewing geometry: -180° Az measurement, negative
elevation angle measurement• Data analysis: NDACC NO2 AMF LUT, daily reference ->
individual scanning reference
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 …
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. O4 DSCDs retrieved from BrO DOAS fits are also shown.
Preliminary MAX-DOAS DSCD Results (Single Daily Reference, 2011)
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. O4 DSCDs retrieved from BrO DOAS fits are also shown.
Preliminary MAX-DOAS DSCD Results (Single Daily Reference, 2011)
MAX-DOAS BrO with Individual Scanning Reference (2011 Campaign)
MAX-DOAS BrO with Individual Scanning Reference (2011 Campaign)
MAX-DOAS BrO with Individual Scanning Reference (2012 Campaign)
MAX-DOAS BrO with Individual Scanning Reference (2012 Campaign)
New NDACC NO2 AMFs
New NDACC NO2 AMFs
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 DSCDsDifferences observed between VCDs retrieved with
new AMF LUTs compared with old version.”
AcknowledgementsWe gratefully acknowledge support from the following groups:
PEARL/CANDAC ARIF, AIF/NSRIT, CFCAS, CFI, CSA, EC, GOC-IPY, INAC, NSERC, NSTP, OIT,
ORF, PCSP, SEARCHACE Arctic Campaigns Co-PI Kaley Walker CSA, EC, NSERC, NSTPLogistical 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 operatorsBIRA-IASB Thanks to M. Van Roozendael and F. Hendrick provide us NDACC NO2 AMFs LUT
v1_0 Thanks to Caroline Fayt provide us QDOAS2.0
Thank you！[email protected]
MAX-DOAS BrO 2011
Day 95 Elevation angle = 6° SZA = 75.5 °
MAX-DOAS BrO 2012
Day 116 Elevation angle = 5° SZA =67.3 °