HIghResolution TRANsmission molecular absorption database HITRAN

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HIgh-Resolution TRANsmission molecular absorption
database (HITRAN)
http//www.cfa.harvard.edu/hitran/
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Why HITRAN?

• There is a need for a database of spectroscopic
  parameters for atmospheric molecules, CFCs, NOx,
  organics, aerosols, etc.
• HITRAN is indispensable as input to atmospheric
  transmission and radiance simulation codes
• HITRAN is the internationally recognized
  standard
• Users have faith that the data is validated
• Contributors have faith that the data will get
  to a large user community

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Schematic of Fundamental Spectroscopic Parameters
of a Line Transition in HITRAN(the Dotted Line
Refers to a Perturbed Transition)
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Molecular Absorption
Partition Sum
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HITRAN Line-by-line Parameters
(39 molecules)
160-character total
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M I
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Diatomics in HITRAN
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Triatomics in HITRAN
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More Molecules in HITRAN
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Impact of HITRAN (Examples)

• Global Climate Modeling
• Support for NASA Earth Orbiting System (EOS)
• Integral part of the DOE ARM program
• Ozone Depletion Studies
• NASA Upper Atmosphere Research Satellite (UARS)
• Atmospheric Trace Molecule Spectroscopy (ATMOS)
• Greenhouse Effect
• Enables balloon-borne, aircraft, and satellite
  systems to make remote sensing retrievals
• Industrial Processes
• Monitoring of production processes, temperature
  in furnaces
• Monitoring of stack emissions
• Oil exploration techniques
• Surveillance
• Target acquisition
• Fence-line monitoring

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C2F6 (CFC-116)
CCl4
CCl3F (CFC-11)
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Pressure and temperature pairs example
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File Structure of HITRAN Compilation
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JavaHAWKS
Java version of HITRAN Atmospheric WorKStation

• Functions to manipulate and filter the HITRAN
  and
• associated molecular spectroscopic databases

• Plotting of line-by-line files and
  cross-section files

• Internet access to HITRAN and other related
  databases

• Links to abstracts that are the sources for
• HITRAN parameters

• Access to archival HITRAN documentation

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Development and Improvementof the HITRAN Database
Laboratory MEASUREMENTS
Atmospheric Planetary
MOLECULAR MODELS (Theory)
HITRAN Database
SIMULATED Spectra
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Original preference order for adding
air-broadened half-width data into HITRAN2004

• Intercomparison database (averaging of 2-8
  experimental data)
• Database of the single measurements

R. Gamache and J.-M. Hartmann, Can. J. Chem., 82
(2004) 1013

• Smoothed values from R. Toth

• Database of complex Robert-Bonamy (CRB)
  calculations
• (http//faculty.uml.edu/Robert_Gamache/)

• Semi-empirical calculations that employ all
  available experimental and theoretical data, D.
  Jacquemart, R.R. Gamache, and L.S. Rothman, JQSRT
  96, 205-239 (2005).

• Default estimate

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Sources of errors

• No available data is flawless
• Experiments are plagued by impurities and line
  overlaps, which are especially difficult for weak
  lines
• Smoothed values are dependant on the quality of
  experimental information
• CRB calculations are not perfectly applied to all
  types of transitions
• Semi-empirical calculations inherit uncertainties
  from the above sources (except smoothed values)
• Approach Each transition have its own
  metabolism and it has own dietsource
  preference

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Intercomparison of experimental data
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Intercomparison of experimental data
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Gordon et al, JQSRT 108 (2007) 389402
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Validation (AER)
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Validation (ACE)