Denis Plutov Dennis Killinger Department of Physics

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Presentation transcript:

Blended HITRAN and other spectra databases for modeling emission-based LIDAR Denis Plutov Dennis Killinger Department of Physics University of South Florida Tampa, FL 11th HITRAN Conference, Cambridge MA, June 16, 2010

Outline Emission based LIDAR - LIBS (Laser-induced breakdown spectroscopy) - LITE (Laser-induced thermal emission) - Modification of LIDAR detected spectrum by atmosphere Use of HITRAN-PC and LIDAR-PC for LIBS / LITE modeling Blended databases for modeling - Comparison of HITRAN and GEISA - Comparison of PNNL, EPA, HITRAN, and GEISA Current work - Need for embedded web-browser to access web-based databases (Mpi-Mainz, JPL, CDMS, EPA) - New spectral features planned for HITRAN-PC 5.0 Beta - Real time spectral decomposition approach examples 5. Overall Philosophy of HITRAN-PC as a Spectral Design Tool

Emission based LIDAR

Emission based LIDAR setups LIBS setup LITE setup

Example of atmospheric effects on experimental LITE spectra Experimental LITE spectrum of painted wood Atmospheric path ~1 meter

Importance of blended databases for accurate transmission spectra Modify our existing HITRAN-PC to include - UV-VIS databases (important for UV LIBS etc.) - IR experimental databases (atmospheric pollutants etc) • Combined use / blending and comparison of databases - Addition of contaminant clouds to the atmosphere - Supplementing spectral data unavailable in HITRAN (such as O2 absorption in the UV for LIBS etc.)

Emission based LIDAR modeling and evolution of HITRAN-PC

Blended / new databases supported by HITRAN-PC 5.0 Beta GEISA line-by-line GEISA cross-sections (difficult to use with automated access) New experimental databases supported - AEDC / EPA (Atmospheric pollutants) - Coblentz IR database - NIST IR databases - Mpi-Mainz UV-VIS spectral atlas JPL and CDMS

Running HITRAN-PC with HITRAN and GEISA at the same time and same parameters Calculation parameters: Slant path 45 degree up looking, 20 km path, 20 layers, US standard

Example: HITRAN and GEISA line-by-line comparisons for CH4 Calculation parameters: 1000m path, part. press: 5E-4 Atm

Example: Comparison of the PNNL, EPA, HITRAN and GEISA line-by-line for CH3Br * - EPA (Multi-spectra, some with contaminants) CH3Br , 1 km path, 5ppm

Example: Comparison of the PNNL, EPA, HITRAN and GEISA line-by-line for CH3Cl * - EPA (Multi-spectra, some with contaminants) CH3Cl , 1 km path, 5ppm

Web-browser database access approach from within HITRAN-PC May need to use embedded Web browser for some databases with manual record-by-record access (Need to interface and work with database owners) Databases: MPI-Mainz UV-VIS Spectral Atlas JPL CDMS AEDC / EPA

HITRAN-PC 5.0 Beta Overview

New spectral features Planned for Beta 5.0 Store individual line spectra for each line-by-line record (and for each layer) Easy to assemble / merge lines or isotopes separately or as a composite in real time with no recalculation Easy direct comparison of different databases in number of lines, differences in coverage etc. New lineshapes and models

Real time spectra decomposition Composite Molecule totals Isotope totals Separate molecule lines Separate isotope lines Calculation parameters: HITRAN database, US Standard (H2O and CO2), horizontal 1000 m path

PNNL and HITRAN comparison for CO2 with spectral decomposition Green – Hitran line-by-line, Blue - PNNL Calculation parameters: US Standard, 100m, CO2

Overall Philosophy

Thank you