World Library  

QR link for Sage III Aerosol Extinction Validation in the Arctic Winter: Comparisons with Sage II and Poam III : Volume 7, Issue 5 (08/03/2007)
Add to Book Shelf
Flag as Inappropriate
Email this Book

Sage III Aerosol Extinction Validation in the Arctic Winter: Comparisons with Sage II and Poam III : Volume 7, Issue 5 (08/03/2007)

By Thomason, L. W.

Click here to view

Book Id: WPLBN0003994721
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Sage III Aerosol Extinction Validation in the Arctic Winter: Comparisons with Sage II and Poam III : Volume 7, Issue 5 (08/03/2007)  
Author: Thomason, L. W.
Volume: Vol. 7, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Poole, L. R., Randall, C. E., & Thomason, L. W. (2007). Sage III Aerosol Extinction Validation in the Arctic Winter: Comparisons with Sage II and Poam III : Volume 7, Issue 5 (08/03/2007). Retrieved from http://community.ebooklibrary.org/


Description
Description: NASA Langley Research Center, Hampton, Virginia, USA. The use of SAGE III multiwavelength aerosol extinction coefficient measurements to infer PSC type is contingent on the robustness of both the extinction magnitude and its spectral variation. Past validation with SAGE II and other similar measurements has shown that the SAGE III extinction coefficient measurements are reliable though the comparisons have been greatly weighted toward measurements made at mid-latitudes. Some aerosol comparisons made in the Arctic winter as a part of SOLVE II suggested that SAGE III values, particularly at longer wavelengths, are too small with the implication that both the magnitude and the wavelength dependence are not reliable. Comparisons with POAM III have also suggested a similar discrepancy. Herein, we use SAGE II data as a common standard for comparison of SAGE III and POAM III measurements in the Arctic winters of 2002/2003 through 2004/2005. During the winter, SAGE II measurements are made infrequently at the same latitudes as these instruments. We have mitigated this problem through the use of potential vorticity as a spatial coordinate and thus greatly increased of the number of coincident events. We find that SAGE II and III extinction coefficient measurements show a high degree of compatibility at both 1020 nm and 450 nm except a 10–20% bias at both wavelengths. In addition, the 452 to 1020 nm extinction ratio shows a consistent bias of ~30% throughout the lower stratosphere. We also find that SAGE II and POAM III are on average consistent though the comparisons show a much higher variability and larger bias than SAGE II/III comparisons. In addition, we find that SAGE II and POAM III data sets are not well correlated at and below 18 km. Overall, we find both the extinction values and the spectral dependence from SAGE III are robust and we find no evidence of a significant defect within the Arctic vortex.

Summary
SAGE III aerosol extinction validation in the Arctic winter: comparisons with SAGE II and POAM III

Excerpt
Alfred, J., Fromm, M., Bevilacqua, R., et al.: Observations and analysis of polar stratospheric clouds detected by POAM III and SAGE III during the SOLVE II/VINTERSOL campaign in the 2002/2003 Northern Hemisphere winter, Atmos. Chem. Phys. Discuss., 6, 11 391–11 426, 2006.; Chu, W. P., McCormick, M. P., Lenoble, J., Brogniez, C., and Pruvost, P.: SAGE II inversion algorithm, J. Geophys. Res., 94, 8339–8351, 1989.; Curtius, J., Weigel, R., Vössing, H.-J., Wernli, H., Werner, A., Volk, C.-M., Konopka, P., Krebsbach, M., Schiller, C., Roiger, A., Schlager, H., Dreilling, V., and Borrmann, S.: Observations of meteoric material and implications for aerosol nucleation in the winter Arctic lower stratosphere derived from in situ particle measurements, Atmos. Chem. Phys., 5, 3053–3069, 2005.; Fromm, M., Alfred, J., and Pitts, M.: A unified, long-term, high-latitude stratospheric aerosol and cloud database using SAM II, SAGE II, and POAM II/III data: algorithm description, database definition, and climatology, J. Geophys. Res., 108, 4366, doi: 10.1029/2002JD002772, 2003.; Kent, G. S., Trepte, C. R., Farrukh, U. O., and McCormick, M. P.: Variation in the stratospheric aerosol associated with the north cyclonic polar vortex as measured by the SAM II satellite sensor, J. Atmos. Sci., 42, 1536–1551, 1985.; Thomason, L. W. and Taha, G.: SAGE III Aerosol Extinction Measurements: Initial Results, Geophys. Res. Lett., 30, 33-1–33-4, doi:10.1029/2003GL017317, 2003.; Lumpe, J. D., Bevilacqua, R. M., Hoppel, K. W., and Randall, C. E.: POAM III retrieval algorithm and error analysis, J. Geophys. Res., 107(D21), 4575, doi:10.1029/2002JD002137, 2002.; Manney, G. L., Michelsen, H. A., Bevilacqua, R. M., Gunson, M. R., Irion, F. W., Livesey, N. J., Oberheide, J., Riese, M., Russell III, J. M., Toon, G. C., and Zawodny, J. M.: Comparison of satellite ozone observations in coincident air masses in early November 1994, J. Geophys. Res., 106, 9923–9943, 2001.; McCormick, M. P., Chu, W. P., Grams, G. W., Hamill, P., Herman, B. M., McMaster, L. R., Pepin, T. J., Russell, P. B., Steele, H. M., and Swissler, T. J.: High-latitude stratospheric aerosols measured by the SAM II satellite system in 1978 and 1979, Science, 214, 328–331, 1981.; Poole, L. R. and Pitts, M. C.: Polar stratospheric cloud climatology based on Stratospheric Aerosol Measurement II observations from 1978 to 1989, J. Geophys. Res., 99, 13 083–13 089, 1994.; Poole, L. R., Trepte, C. R., Harvey, V. L., Toon, G. C., and VanValkenberg, R. L.: SAGE III observations of Arctic polar stratospheric clouds – December 2002, Geophys. Res., Lett., 30(23), 2216, doi10.1029/2003GL018496, 2003.; Randall, C. E., Bevilacqua, R. M., Lumpe, J. D., and Hoppel, K. W.: Validation of POAM~III aerosols: Comparison to SAGE II and HALOE, J. Geophys. Res., 106(D21), 27 525–27 536, 2001.; Russell, P., Livingston, J., Schmid, B., Eilers, J., Kolyer, R., Redemann, J., Ramirez, S., Yee, J.-H., Swartz, W., Shetter, R., Trepte, C., Risley Jr., A., Wenny, B., Zawodny, J., Chu, W., Pitts, M., Lumpe, J., Fromm, M., Randall, C., Hoppel, K., and Bevilacqua, R.: Aerosol optical depth measurements by airborne sun photometer in SOLVE II: Comparisons to SAGE~III, POAM III and airborne spectrometer measurements, Atmos. Chem. Phys., 5, 1311–1339, 2005.; SAGE~III Algorithm Theoretical Basis Document: Solar and Lunar Algorithm, LaRC 475-00-108, Version 2.1, 26 March 2002.; Strawa, A. W., Drdla, K., Fromm, M., Pueschel, R. F., Hoppel, K. W., Browell, E. V., Hamill, P., and Dempsey, D. P.: Discriminating Types Ia and Ib polar stratospheric clouds in POAM satellite data, J. Geophys. Res., 107(D20), 8291, doi:10.1029/2001JD000458, 2002.; Thomason, L. W. and Poole, L. R.: Use of stratospheric aerosol properties as diagnostics of Antarctic vortex processes, J. Geophys. Res., 98, 23 003–23 012, 1993.; Thomason, L. W., Zawodny

 

Click To View

Additional Books


  • Technical Note: a New Method for the Lag... (by )
  • Heterogeneous Conversion of No2 on Secon... (by )
  • Ozone Vegetation Damage Effects on Gross... (by )
  • Multicomponent Aerosol Dynamics Model Uh... (by )
  • Ice Particle Habit and Surface Roughness... (by )
  • Technical Note: First Spectral Measureme... (by )
  • Evaluation of Aerosol Number Concentrati... (by )
  • Emergence of a Tracer Source from Air Co... (by )
  • Modelling Study of the Impact of Deep Co... (by )
  • A Gcm Study of Organic Matter in Marine ... (by )
  • Evaluation of Ecmwf Era-40 Temperature a... (by )
  • Model Study on the Dependence of Primary... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.