Comparisons of ACE-FTS and PARIS-IR Measurements of Several Trace Gases in the Northern Mid-latitude Atmosphere Dejian Fu, Kaley A. Walker, Keeyoon Sung, Chris Boone, Sean D. McLeod, Peter F. Bernath, Dept. of Chemistry, University of Waterloo

PARIS-IR Ground-based Measurements Purpose for these Measurements Purpose for these Measurements 1. To monitor the concentrations of atmospheric trace gases simultaneously 1. To monitor the concentrations of atmospheric trace gases simultaneously 2. To conduct measurements over large time scales for observing trends 2. To conduct measurements over large time scales for observing trends 3. To assist in validating ACE-FTS 3. To assist in validating ACE-FTS Target Species: Target Species: O 3, CH 4, N 2 O, H 2 O, HNO 3, HCl, NO, NO 2, CCl 3 F, CCl 2 F 2, HF, CO O 3, CH 4, N 2 O, H 2 O, HNO 3, HCl, NO, NO 2, CCl 3 F, CCl 2 F 2, HF, CO Location of Measurements Location of Measurements 1. Waterloo Atmospheric Observatory (WAO), Waterloo, Ontario (43°N, 81°W) 1. Waterloo Atmospheric Observatory (WAO), Waterloo, Ontario (43°N, 81°W) 2. Vanscoy, Saskatchewan (52°N, 107°W) during Middle Atmosphere Nitrogen TRend Assessment (MANTRA) balloon campaign 2. Vanscoy, Saskatchewan (52°N, 107°W) during Middle Atmosphere Nitrogen TRend Assessment (MANTRA) balloon campaign

Portable Atmospheric Research Interferometric Spectrometer (PARIS-IR) Max. Res. : 0.02 cm -1 Meas. Reg.: 750–4400 cm -1 Max. Scan Speed: 2.5 cm/s Detectors : InSb HgCdTe pendulum arm ZnSe beam splitter elevation gimbal azimuth gimbal sun sensor pointing mirror solar beam

Spectrum recorded by PARIS-IR O3O3 N2ON2O CO 2 CH 4 HF HCl OCS CO 2 H2OH2O

Retrievals: Process of Going from Spectra to Trace Gas Concentration No A retrieval code named SFIT2 used for trace gas retrievals. It contains a line- by-line calculation program for the forward model and uses the optimal estimation method (developed by C. Rinsland, NASA Langley, and B. Connor, NIWA, New Zealand). a priori VMR profiles p & T profile from ozonesonde NCEP and MSIS spectral line parameters (HITRAN2004) air mass (RAYTRACE 2.03) altitude grid (29 layers) Computed Spectra Observed Spectra Optimal Estimation Discrepancy within a specified convergence criterion Adjust VMR Profile Output retrieval result yes Volume Mixing Ratio (VMR) : P i / P

A Sample for N 2 O Retrievals N2ON2O

Column Densities Retrieved from Spectra on Nov. 3 rd, 2004 Columns Density of N 2 O Retrieved on 2005/11/03 Columns Density of O 3 Retrieved on 2005/11/03 1DU = 2.687x10 16 /cm 2

Error budget Error sourcesN2ON2O O3O3O3O3 Systematic errors Spectroscopic line parameters~2%~5% A priori profile A priori profile<1%7.1% Line shape function Line shape function1%3% Random errors RMS noise + model parameters RMS noise + model parameters2.8%2.7% Solar Zenith Angle Solar Zenith Angle<1%<1% Temperature Temperature < 1% <1% Total errors (not including smoothing errors) 8.8 % %

Daily Mean Column Densities on Nov. 3 rd, 2004 Species Column Density CH (10) x10 19 /cm 2 CO (22) x10 21 /cm 2 N2ON2ON2ON2O 6.40 (18) x10 18 /cm 2 O3O3O3O (7.0) DU* HCl 2.81 (07) x10 15 /cm 2 HF 1.23 (02) x10 15 /cm 2 * 1DU = 2.687x10 16 /cm 2

Total ozone map for the globe Map was downloaded from website of Meteorological Service of Canada data from World Ozone and Ultraviolet radiation Data Centre (WOUDC) 253DU This work 258(7)DU * 1DU = x /cm 2

O 3 Column Density from ACE-FTS ACE–FTS (9.64) DU PARIS–IR (6.94) DU ACE – FTS Measurements taken from September to December, 2004 around Waterloo region * 1DU = 2.687x10 16 /cm 2

Middle Atmosphere Nitrogen TRend Assessment (MANTRA) Balloon Campaign Environment Canada Balloon Launch Facility Vanscoy, Saskatchewan (52°N, 107°W) Campaign period: from Aug. 3rd to Sept. 16th 2004

Mean Column Densities on Aug. 13th, 2004 Species Column Density CH (09) x10 19 /cm 2 CO (20) x10 21 /cm 2 N2ON2ON2ON2O 6.13 (17) x10 18 /cm 2 O3#O3#O3#O3# (8.3) DU* HCl 3.15 (08) x10 15 /cm 2 N2N2N2N (03) x10 25 /cm 2 # Results obtained from Brewer, UV-visible Spectrometer and Ozonesonde are 310, 312, 300 DU respectively. * 1DU = 2.687x10 16 /cm 2

O 3 Column Density from ACE-FTS ACE–FTS (14.7) DU PARIS–IR (8.29) DU * 1DU = 2.687x10 16 /cm 2 ACE–FTS Measurements taken from July to September, 2004 around Vanscoy region

Summary Measurements were performed by PARIS–IR at Mid–latitudes. Measurements were performed by PARIS–IR at Mid–latitudes. Column densities of several trace gases were retrieved using SFIT2 program. Column densities of several trace gases were retrieved using SFIT2 program. Good agreement of the results between PARIS–IR, Brewer, Ozonesonde and ACE-FTS measurements. Good agreement of the results between PARIS–IR, Brewer, Ozonesonde and ACE-FTS measurements. Observations are continuing at WAO and will be used for ACE- FTS validation. Observations are continuing at WAO and will be used for ACE- FTS validation.

Acknowledgements Natural Science and Engineering Research Council, Canada Canadian Space Agency Meteorological Service of Canada World Ozone and Ultraviolet radiation Data Centre Jonathan Davies, Annemarie Fraser, Tom McElroy