Transcript MAX-DOAS measurement in PEARL

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
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
Photo:
1100 km from North Pole
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, 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 NO2 measurements using ground-based instruments at 80N. Atmos. Meas. Tech., 5, 927953, 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 80N 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 Instruments
UT-GBS (University of Toronto
Ground-Based Spectrometer)
PEARL-GBS (Polar Environment
Atmospheric Research Laboratory GBS)
 Jobin-Yvon Triax-180 triple grating
 Nearly identical to UT-GBS
spectrometer
 Filter Wheel
 Thermoelectrically cooled CCD detector
 History:
 Operation indoors using dome
 Installed permanently at PEARL in
 Automated operation (LabView)
August 2006
 History:
 Installed sun tracker in 2008, enabling
 Involved in spring field campaigns since
MAX-DOAS and direct-sun
1999 and currently at PEARL
observations
 Participated in CINDI 2009 (Roscoe et al.,
 NDACC certification in January 2009
2010)
Viewing Geometries
UT-GBS
PEARL-GBS
 Taking zenith-sky measurements
 Using 600 gr/mm grating center at
450 nm (visible) optimized for
ozone, NO2
•
•
Taking zenith-sky/direct sun/MAXDOAS alternating measurements
Using 1200 gr/mm grating center
at 350 nm (UV) optimized for BrO
Mirror 1
Elevation
Motor
Azimuthal
Motor
Mirror 2
Sunlight
Zenith sky
SZA
GBS
Sun
Stratosphere
Troposphere
Elevation angle
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
UPS
Sundog
PC
PEARLGBS
Tracker
UPS
ibootbar
Input A
Input B
Moondog
PC
Trax PC
Research Tasks
• Cooling system
• Depolarization: 3 m long fiber/ mode mixing box
Polarization
Fiber bundle
Circular entrance
from telescope
Rectangular exit to
spectrometer entrance
slit via F/# matcher
Platt, U. & Stutz, J.
Cristen Adams
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 …
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)
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.
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 DSCDs
 Differences observed between VCDs retrieved with
new AMF LUTs compared with old version.”
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 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 °