Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to the lower mesosphere

The ACE-FTS (Atmospheric Chemistry Experiment – Fourier Transform Spectrometer) solar occultation instrument that was launched onboard the Canadian SCISAT-1 satellite in August 2003 is measuring vertical profiles from the upper troposphere to the lower mesosphere for a large number of atmospheric constituents. Methane is one of the key species. The version v2.2 data of the ACE-FTS CH 4 data have been compared to correlative satellite, balloon-borne and ground-based Fourier transform infrared remote sensing data to assess their quality. The comparison results indicate that the accuracy of the data is within 10% in the upper troposphere – lower stratosphere, and within 25% in the middle and higher stratosphere up to the lower mesosphere (<60 km). The observed differences are generally consistent with reported systematic uncertainties. ACE-FTS is also shown to reproduce the variability of methane in the stratosphere and lower mesosphere.

[1]  Peter F. Bernath,et al.  Stratospheric abundances of water and methane based on ACE‐FTS measurements , 2005 .

[2]  Clive D Rodgers,et al.  Inverse Methods for Atmospheric Sounding: Theory and Practice , 2000 .

[3]  G. Toon,et al.  Lamination and polar vortex development in fall from ATMOS long‐lived trace gases observed during November 1994 , 2000 .

[4]  B. Connor,et al.  Intercomparison of remote sounding instruments , 1999 .

[5]  J. H. Park,et al.  Measurements of methane and nitrous oxide distributions by the improved stratospheric and mesospheric sounder: Retrieval and validation , 1996 .

[6]  C. Piccolo,et al.  Validation and data characteristics of methane and nitrous oxide profiles observed by MIPAS and processed with Version 4.61 algorithm , 2007 .

[7]  William G. Read,et al.  EOS Microwave Limb Sounder observations of the Antarctic polar vortex breakup in 2004 , 2005 .

[8]  J. F. Meirink,et al.  Assessing Methane Emissions from Global Space-Borne Observations , 2005, Science.

[9]  Guy P. Brasseur,et al.  Atmospheric chemistry and global change , 1999 .

[10]  M. Wahlen The Global Methane Cycle , 1993 .

[11]  C. Rinsland,et al.  Intercomparison of retrieval codes used for the analysis of high-resolution, ground-based FTIR measurements , 2004 .

[12]  V. Catoire,et al.  SPIRALE: a multispecies in situ balloonborne instrument with six tunable diode laser spectrometers. , 2005, Applied optics.

[13]  James M. Russell,et al.  The Halogen Occultation Experiment , 1993 .

[14]  P. Duchatelet,et al.  Comparisons between ground-based FTIR and MIPAS N 2 O and HNO 3 profiles before and after assimilation in BASCOE , 2006 .

[15]  K. Hoppel,et al.  Northern hemisphere summer ozone variability observed by POAM II , 1999 .

[16]  T. Clarmann,et al.  Atmospheric non-local thermodynamic equilibrium emissions as observed by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) , 2005 .

[17]  P. Bernath,et al.  Solar Occultation Satellite Data and Derived Meteorological Products: Sampling Issues and Comparisons with Aura MLS , 2007 .

[18]  Mark R. Schoeberl,et al.  The structure of the polar vortex , 1992 .

[19]  Peter F. Bernath,et al.  Atmospheric chemistry experiment (ACE): mission overview , 2004, SPIE Optics + Photonics.

[20]  Carl A. Reber,et al.  The Upper Atmosphere Research Satellite (UARS) mission , 1993 .

[21]  Manuel López-Puertas,et al.  MIPAS level 2 operational analysis , 2006 .

[22]  Gang Li,et al.  The HITRAN 2008 molecular spectroscopic database , 2005 .

[23]  Arlan W. Mantz,et al.  Measurement of the temperature dependence of line mixing and pressure broadening parameters between 296 and 90 K in the ν3 band of 12CH4 and their influence on atmospheric methane retrievals , 2007 .

[24]  M. Luo,et al.  An analysis of the Antarctic Halogen Occultation Experiment trace gas observations , 1995 .

[25]  J. Zawodny,et al.  Comparison of satellite ozone observations in coincident air masses in early November 1994 , 2001 .

[26]  Yuk L. Yung,et al.  The Atmospheric Trace Molecule Spectroscopy (ATMOS) Experiment: Deployment on the ATLAS Space Shuttle Missions , 1996 .

[27]  M. Santee,et al.  Polar vortex dynamics during spring and fall diagnosed using trace gas observations from the Atmospheric Trace Molecule Spectroscopy instrument , 1999 .

[28]  P. E. Morris,et al.  Optimized forward model and retrieval scheme for MIPAS near-real-time data processing. , 2000, Applied optics.

[29]  C. Piccolo,et al.  Precision validation of MIPAS-Envisat products , 2007 .

[30]  John C. Gille,et al.  Validation of CH4 and N2O measurements by the cryogenic limb array etalon spectrometer instrument on the Upper Atmosphere Research Satellite , 1996 .

[31]  B. Heese,et al.  Quantification of the transport of chemical constituents from the polar vortex to midlatitudes in the lower stratosphere using the high-resolution advection model MIMOSA and effective diffusivity , 2002 .

[32]  P. Hartogh,et al.  MIPAS (Michelson Interferometer for Passive Atmosphere Sounding): Potential of the experiment, data processing and validation of results , 2008 .

[33]  D. Hauglustaine,et al.  MIPAS reference atmospheres and comparisons to V4.61/V4.62 MIPAS level 2 geophysical data sets , 2007 .

[34]  M. Newchurch,et al.  On the Assessment and Uncertainty of Atmospheric Trace Gas Burden Measurements with High Resolution Infrared Solar Occultation Spectra from Space , 1996 .

[35]  P. Bernath,et al.  Retrievals for the atmospheric chemistry experiment Fourier-transform spectrometer. , 2005, Applied optics.

[36]  Christopher R. Webster,et al.  Validation of Halogen Occultation Experiment CH4 measurements from the UARS , 1996 .

[37]  F. Hasea,et al.  Intercomparison of retrieval codes used for the analysis of high-resolution , ground-based FTIR measurements , 2004 .

[38]  James M. Russell,et al.  Comparison of atmospheric retrievals from ACE and HALOE , 2005 .

[39]  Christopher D. Barnet,et al.  Trace gas measurements from the atmospheric infrared sounder (AIRS) , 2003 .

[40]  P. Bernath,et al.  Solar occultation satellite data and derived meteorological products: Sampling issues and comparisons with Aura Microwave Limb Sounder , 2007 .

[41]  T. Clarmann,et al.  MIPAS: an instrument for atmospheric and climate research , 2007 .

[42]  J. H. Shaw,et al.  Measurements of CH4, N2O, CO, H2O, and O3 in the middle atmosphere by the Atmospheric Trace Molecule Spectroscopy experiment on Spacelab 3 , 1990 .