Spectroscopy as long as the Atmospheric Chemistry Experiment (ACE) Line mixing (Voigt) Line mixing (speed-dependent) Line mixing plus speed-dependence (continued) Line shape benefits
Devine, Caribe, Meteorologist has reference to this Academic Journal, PHwiki organized this Journal Spectroscopy as long as the Atmospheric Chemistry Experiment (ACE) Chris Boone, Kaley Walker, in addition to Peter Bernath HITRAN Meeting June, 2010 Atmospheric Chemistry Experiment Satellite mission as long as remote sensing of the Earths atmosphere, with a primary focus on Arctic ozone Developed by the Canadian Space Agency Launched August 2003, science operations began February 2004 Operating well, no major problems yet. Primary instrument ACE-FTS: 0.02 cm-1 resolution, 750-4400 cm-1, ~300:1 SNR. Line mixing (Voigt) Rosenkranz first order line mixing (Voigt) gV,LM is the Voigt function with line mixing, W(z) is the complex probability function, in addition to Y is the line mixing parameter. In the absence of line mixing (Y = 0), only the K(x,y) term contributes to the line shape.
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Analytical expressions derived as long as L(x,y) using the Humlicek algorithm. A paper describing these expressions is about to be submitted to JQSRT. Line mixing (speed-dependent) Some methane lines feature both line mixing in addition to speed dependence. Simple empirical extension of the first order Rosenkranz approximation as long as line mixing Assume coupling coefficient Y has no speed dependence Line mixing plus speed-dependence (continued)
For these lines, speed-dependence appears to be a stronger effect than line mixing. It is the opposite as long as other CH4 lines in the vicinity. With CH4 line mixing in addition to speed-dependent Voigt parameters in place (derived from ACE-FTS spectra), we can now retrieve acetone from the ACE-FTS. Line shape benefits Analytical, simple, in addition to efficient. The most complicated is line mixing + SDV: requires real parts + imaginary parts of 2 Voigt-type functions. Well-suited to line-by-line calculations. One extra parameter per line as long as speed-dependence (2) in addition to one extra parameter per line as long as line mixing (Y). Extra parameters as long as temperature dependences Not aiming as long as the truest physical model or the most accurate calculation approach. Aiming as long as accurate enough: a significant improvement over the Voigt function, improved fitting residuals, improved VMRs Geared toward atmospheric VMR retrievals.
H2O Obtained a set of 27 lab spectra from Manfred Birk at DLR (23 air-broadening), covering the range 1250-1750 cm-1. Currently exclude 4 with poorer SNR but will include them in final analysis. Awaiting a few higher-P measurements. Analyzing spectra with a speed-dependent Voigt line shape, generating spectroscopic parameters. Self-broadened spectra
Temperature-dependent Pressure-shift Difficult Doublets Pairs of closely spaced H2O lines (same isotopologue, nearly the same E, etc.) can often be difficult to fit Something else going on. Including line mixing improves results, but far from perfect. H2O in ACE-FTS Speed-dependent Voigt parameters derived from gas cell measurements improve fitting residuals in ACE-FTS, but problems remain. Deficiencies in the as long as ward model as long as H2O in the troposphere. Forward model employs a 1-km altitude grid. H2O VMR can double over the span of 1 km in the troposphere. Changing the as long as ward model.
Missing HNO3 H15NO3 HNO3 HNO3 HNO3 O2 continuum N2 continuum Residual spectra full of missing HNO3. CHF3 Fluorine budget in the stratosphere is an important measure of anthropogenic activity (unlike Chlorine, few natural sources). No spectroscopic data available as long as the molecule. Found a set of lab measurements with various problems. Used low-resolution measurements from PNNL as long as absolute calibration, in addition to then Geoff Toon generated a set of pseudo-lines as long as the molecule.
ACE-FTS window as long as CH3OH retrievals No CH3OH in this region in HITRAN Missing CH3Cl Red curve = CH3Cl calculated with HITRAN 2008 CH3Cl excluded from calculation Missing a lot of CH3Cl lines in HITRAN 2008. Looking at the program as long as this meeting, is this now fixed Wish list: CH3OOH K.H. Becker et al, Tunable diode laser measurements of CH3OOH cross-sections near 1320 cm-1, Geophys Res Lett, 16, 1367-1370 (1989).
17O12C16O Is the isotopic differentiation really this large, or are there problems with the intensities of the isotopologue 4 lines 18O13C16O Conclusions Refining ACE-FTS line shape calculations to improve residuals ( in addition to thereby retrievals). Continuing to search as long as weak absorbers. Would especially like spectroscopy as long as the 3-micron region. Generating spectroscopic parameters as long as H2O in addition to CH4 from lab spectra.
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