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Comparison of ER-2 aircraft and POAM III, MLS, and SAGE II satellite measurements during SOLVE using traditional correlative analysis and trajectory hunting technique

Danilin, M. Y. and Ko, M. K. W. and Bevilacqua, R. M. and Lyjak, L. V. and Froidevaux, L. and Santee, M. L. and Zawodny, J. M. and Hoppel, K. W. and Richard, E. C. and Spackman, J. R. and Weinstock, E. M. and Herman, R. L. and McKinney, K. A. and Wennberg, P. O. and Eisele, F. L. and Stimpfle, R. M. and Scott, C. J. and Elkins, J. W. and Bui, T. V. (2002) Comparison of ER-2 aircraft and POAM III, MLS, and SAGE II satellite measurements during SOLVE using traditional correlative analysis and trajectory hunting technique. Journal of Geophysical Research D, 107 (D5). Art. No. SOL 58. ISSN 0148-0227.

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We compared the version 5 Microwave Limb Sounder (MLS), version 3 Polar Ozone and Aerosol Measurement III (POAM III), version 6.0 Stratospheric Aerosol and Gas Experiment II (SAGE II), and NASA ER-2 aircraft measurements made in the Northern Hemisphere in January–February 2000 during the SAGE III Ozone Loss and Validation Experiment (SOLVE). This study addresses one of the key scientific objectives of the SOLVE campaign, namely, to validate multiplatform satellite measurements made in the polar stratosphere during winter. This intercomparison was performed by using a traditional correlative analysis (TCA) and a trajectory hunting technique (THT). TCA compares profiles colocated within a chosen spatial-temporal vicinity. Launching backward and forward trajectories from the points of measurement, the THT identifies air parcels sampled at least twice within a prescribed match criterion during the course of 5 days. We found that the ozone measurements made by these four instruments agree most of the time within ±10% in the stratosphere up to 1400 K (∼35 km). The water vapor measurements from POAM III and the ER-2 Harvard Lyman α hygrometer and Jet Propulsion Laboratory laser hygrometer agree to within ±0.5 ppmv (or about ±10%) in the lower stratosphere above 380 K. The MLS and ER-2 ClO measurements agree within their error bars for the TCA. The MLS and ER-2 nitric acid measurements near 17- to 20-km altitude agree within their uncertainties most of the time with a hint of a positive offset by MLS according to the TCA. We also applied the Atmospheric and Environmental Research, Inc. box model constrained by the ER-2 measurements for analysis of the ClO and HNO3 measurements using the THT. We found that: (1) the model values of ClO are smaller by about 0.3–0.4 (0.2) ppbv below (above) 400 K than those by MLS and (2) the HNO3 comparison shows a positive offset of MLS values by ∼1 and 1–2 ppbv below 400 K and near 450 K, respectively. Our study shows that, with some limitations (like HNO3 comparison under polar stratospheric cloud conditions), the THT is a more powerful tool for validation studies than the TCA, making conclusions of the comparison statistically more robust.

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URLURL TypeDescription PublisherErratum
McKinney, K. A.0000-0003-1129-1678
Wennberg, P. O.0000-0002-6126-3854
Additional Information:© 2002 American Geophysical Union. Received 27 April 2001; revised 7 August 2001; accepted 19 September 2001; published 11 December 2002. We thank R.J. Salawitch for providing the ER-2 merged files and D. W. Fahey, C. R. Webster, K. K. Perkins, J. C. Wilson, and D. G. Baumgardner for their instrument data used in our model initialization. We thank A. Tabazadeh for her STS code. Comments of two anonymous reviewers are appreciated. Work at AER, Inc., was supported by the UARS Guest Investigator Program (NAS5-98131) and NASA Atmospheric Chemistry and Model Analysis Program (NAS5-97039 and NAS1-00138). M.Y.D. acknowledges the travel support from the NASA Atmospheric Effects of Aviation Project for his involvement in SOLVE. L.V.L. is partially supported by the UARS Guest Investigator Program (S10109-X). Work at the Jet Propulsion Laboratory, California Institute of Technology, was done under contract with NASA. The ER-2 instrument coauthors acknowledge support from the NASA Upper Atmosphere Research Program. NCAR is supported by the National Science Foundation.
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Subject Keywords:measurement comparison; trajectory hunting; correactive analysis; SOLVE
Issue or Number:D5
Record Number:CaltechAUTHORS:20140630-153240695
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Official Citation:Danilin, M. Y., et al., Comparison of ER-2 aircraft and POAM III, MLS, and SAGE II satellite measurements during SOLVE using traditional correlative analysis and trajectory hunting technique, J. Geophys. Res., 107, 8315, doi:10.1029/2001JD000781, 2002. [printed 108(D5), 2003]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46581
Deposited By: Jason Perez
Deposited On:30 Jun 2014 23:13
Last Modified:09 Mar 2020 13:19

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