Ten years of Southern Hemisphere polar mesospheric cloud observations from the Polar Ozone and Aerosol Measurement instruments

2008 ◽  
Vol 113 (D4) ◽  
Author(s):  
J. D. Lumpe ◽  
J. M. Alfred ◽  
E. P. Shettle ◽  
R. M. Bevilacqua
Keyword(s):  
Southern Hemisphere ◽  
Measurement Instruments ◽  
Aerosol Measurement ◽  
Polar Ozone

scholarly journals A revised linear ozone photochemistry parameterization for use in transport and general circulation models: multi-annual simulations

2007 ◽  
Vol 7 (9) ◽  
pp. 2183-2196 ◽  
Author(s):  
D. Cariolle ◽  
H. Teyssèdre
Keyword(s):  
Time Evolution ◽  
Southern Hemisphere ◽  
General Circulation ◽  
Polar Vortex ◽  
General Circulation Models ◽  
Reaction Rates ◽  
Heterogeneous Reactions ◽  
Ozone Destruction ◽  
Ozone Photochemistry ◽  
Polar Ozone

Abstract. This article describes the validation of a linear parameterization of the ozone photochemistry for use in upper tropospheric and stratospheric studies. The present work extends a previously developed scheme by improving the 2-D model used to derive the coefficients of the parameterization. The chemical reaction rates are updated from a compilation that includes recent laboratory work. Furthermore, the polar ozone destruction due to heterogeneous reactions at the surface of the polar stratospheric clouds is taken into account as a function of the stratospheric temperature and the total chlorine content. Two versions of the parameterization are tested. The first one only requires the solution of a continuity equation for the time evolution of the ozone mixing ratio, the second one uses one additional equation for a cold tracer. The parameterization has been introduced into the chemical transport model MOCAGE. The model is integrated with wind and temperature fields from the ECMWF operational analyses over the period 2000–2004. Overall, the results from the two versions show a very good agreement between the modelled ozone distribution and the Total Ozone Mapping Spectrometer (TOMS) satellite data and the "in-situ" vertical soundings. During the course of the integration the model does not show any drift and the biases are generally small, of the order of 10%. The model also reproduces fairly well the polar ozone variability, notably the formation of "ozone holes" in the Southern Hemisphere with amplitudes and a seasonal evolution that follow the dynamics and time evolution of the polar vortex. The introduction of the cold tracer further improves the model simulation by allowing additional ozone destruction inside air masses exported from the high to the mid-latitudes, and by maintaining low ozone content inside the polar vortex of the Southern Hemisphere over longer periods in spring time. It is concluded that for the study of climate scenarios or the assimilation of ozone data, the present parameterization gives a valuable alternative to the introduction of detailed and computationally costly chemical schemes into general circulation models.

scholarly journals Aerosol optical depth measurements by airborne sun photometer in SOLVE II: Comparisons to SAGE III, POAM III and airborne spectrometer measurements

2005 ◽  
Vol 5 (5) ◽  
pp. 1311-1339 ◽  
Author(s):  
P. Russell ◽  
J. Livingston ◽  
B. Schmid ◽  
J. Eilers ◽  
R. Kolyer ◽  
...  
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Stratospheric Aerosol ◽  
Line Of Sight ◽  
Aerosol Measurement ◽  
Validation Experiment ◽  
Satellite Sensors ◽  
Beam Transmission ◽  
Relative Differences ◽  
Polar Ozone

Abstract. The 14-channel NASA Ames Airborne Tracking Sunphotometer (AATS-14) measured solar- beam transmission on the NASA DC-8 during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II). This paper presents AATS-14 results for multiwavelength aerosol optical depth (AOD), including comparisons to results from two satellite sensors and another DC-8 instrument, namely the Stratospheric Aerosol and Gas Experiment III (SAGE III), the Polar Ozone and Aerosol Measurement III (POAM III) and the Direct-beam Irradiance Airborne Spectrometer (DIAS). AATS-14 provides aerosol results at 13 wavelengths λ spanning the range of SAGE III and POAM III aerosol wavelengths. Because most AATS measurements were made at solar zenith angles (SZA) near 90°, retrieved AODs are strongly affected by uncertainties in the relative optical airmass of the aerosols and other constituents along the line of sight (LOS) between instrument and sun. To reduce dependence of the AATS-satellite comparisons on airmass, we perform the comparisons in LOS transmission and LOS optical thickness (OT) as well as in vertical OT (i.e., optical depth, OD). We also use a new airmass algorithm that validates the algorithm we previously used to within 2% for SZA<90°, and in addition provides results for SZA≥90°. For 6 DC-8 flights, 19 January-2 February 2003, AATS and DIAS results for LOS aerosol OT at λ=400nm agree to ≤12% of the AATS value. Mean and root-mean-square (RMS) differences, (DIAS-AATS)/AATS, are -2.3% and 7.7%, respectively. For DC-8 altitudes, AATS-satellite comparisons are possible only for λ>440nm, because of signal depletion for shorter λ on the satellite full-limb LOS. For the 4 AATS-SAGE and 4 AATS-POAM near-coincidences conducted 19-31 January 2003, AATS-satellite AOD differences were ≤0.0041 for all λ>440nm. RMS differences were ≤0.0022 for SAGE-AATS and ≤0.0026 for POAM-AATS. RMS relative differences in AOD ([SAGE-AATS]/AATS) were ≤33% for λ<~755nm, but grew to 59% for 1020nm and 66% at 1545nm. For λ>~755nm, AATS-POAM differences were less than AATS-SAGE differences, and RMS relative differences in AOD ([AATS-POAM]/AATS) were ≤31% for all λ between 440 and 1020nm. Unexplained differences that remain are associated with transmission differences, rather than differences in gas subtraction or conversion from LOS to vertical quantities. The very small stratospheric AOD values that occurred during SOLVE II added to the challenge of the comparisons, but do not explain all the differences.

The Polar Ozone and Aerosol Measurement instrument

1996 ◽  
Vol 101 (D9) ◽  
pp. 14479-14487 ◽  
Author(s):  
W. Glaccum ◽  
R. L. Lucke ◽  
R. M. Bevilacqua ◽  
E. P. Shettle ◽  
J. S. Hornstein ◽  
...  
Keyword(s):  
Measurement Instrument ◽  
Aerosol Measurement ◽  
Polar Ozone

scholarly journals An analysis of Polar Ozone and Aerosol Measurement (POAM) II Arctic polar stratospheric cloud observations, 1993-1996

1999 ◽  
Vol 104 (D20) ◽  
pp. 24341-24357 ◽  
Author(s):  
Michael D. Fromm ◽  
Richard M. Bevilacqua ◽  
John Hornstein ◽  
Eric Shettle ◽  
Karl Hoppel ◽  
...  
Keyword(s):  
Aerosol Measurement ◽  
Polar Stratospheric Cloud ◽  
Polar Ozone

scholarly journals Comparison of Polar Ozone and Aerosol Measurement (POAM) II and Stratospheric Aerosol and Gas Experiment (SAGE) II aerosol measurements from 1994 to 1996

2000 ◽  
Vol 105 (D3) ◽  
pp. 3929-3942 ◽  
Author(s):  
C. E. Randall ◽  
R. M. Bevilacqua ◽  
J. D. Lumpe ◽  
K. W. Hoppel ◽  
D. W. Rusch ◽  
...  
Keyword(s):  
Stratospheric Aerosol ◽  
Aerosol Measurement ◽  
Polar Ozone

scholarly journals Polar Ozone and Aerosol Measurement (POAM) II stratospheric NO2, 1993-1996

1998 ◽  
Vol 103 (D21) ◽  
pp. 28361-28371 ◽  
Author(s):  
C. E. Randall ◽  
D. W. Rusch ◽  
R. M. Bevilacqua ◽  
K. W. Hoppel ◽  
J. D. Lumpe
Keyword(s):  
Aerosol Measurement ◽  
Polar Ozone

Polar Ozone and Aerosol Measurement Experiment (POAM-II)

1994 ◽  
Author(s):  
Richard M. Bevilacqua ◽  
Eric P. Shettle ◽  
John S. Hornstein ◽  
Philip R. Schwartz ◽  
Davidson T. Chen ◽  
...  
Keyword(s):  
Aerosol Measurement ◽  
Measurement Experiment ◽  
Polar Ozone
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