# Presentation: 525180

## Evaluated Data and Calibration Standards Requirements for Real-time Atmospheric MeasurementsPrepared byC.E. KolbAerodyne Research, Inc.Prepared forWorkshop on Atmospheric Measurement and StandardsNational Institute of Standards and TechnologyGaithersberg, MD6 September 2001

**Evaluated Data and Calibration ****Standards Requirements for ****Real-time Atmospheric Measurements**Prepared byC.E. KolbAerodyne Research, Inc.Prepared forWorkshop on Atmospheric Measurement and StandardsNational Institute of Standards and TechnologyGaithersberg, MD6 September 2001

***AERODYNE RESEARCH, INC.***

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- Billerica, MA  01821-3976
- TEL:  (978) 663-9500
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- http://www.aerodyne.com

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## Composition of the Earth’s Lower Atmosphere

**Condensed Phase****	****Condensed Phase/Gas Phase**
**	****	****	****	****	****	****Volume Ratio**
**	****	****Tropospheric Cloud****	****	****	****        ~3 x 10****-7**
**	****	****Tropospheric Aerosol****	****	****        ~10****-12**** - 10****-7**** ****	****	****	****Stratospheric Sulfate Aerosol****	****	****        ~3 x 10****-14**
**	****	****Polar Stratospheric Cloud****	****	****        ~10****-11**** - 10****-12**

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## Trace Gas Atmospheric Measurements:  Evaluated Data Requirements

**Parameter****	****	****	****	****Comments**
**Spectral Line Strengths****	****	****	**** ********-wave/mm-wave/IR/VIS/UV**
**Line Broadening Coefficienst****	****	****	**** ********-wave/mm-wave/IR**
**Photolysis Cross Sections/Quantum Yields****	****VIS/UV/VU**
**Photoionization Cross Sections****	****	****Single Photon-UV/VUV, **
**	****	****	****	****	****	****     ****2-3 Photon, VIS-UV**
**Electron Impact Cross Sections****	****	****70 eV, Other Energies, **
**	****	****	****	****	****	****     ****T Dependence**
**Electron Impact Fragmentation Patterns****	****	****70 eV, Other Energies**
**Chemical Ionization Cross Sections****	****	****CO****3****-****(H****2****O)****n****, NO****3****-****(H****2****O)****n****, ****	****	****	****	****	****	****    H****3****O****+****(H****2****O)****n****, Others**
**	**

## Trace Gas Atmospheric Measurements:  Evaluated Data Requirements (Cont’d)

**Parameter****	****	****	****	****       Comments**
**	****Reaction Rate Constants****	****	****	****Radical/Radical, ****	****	****	****	****	****	****	****    ****	****	****	****	****     Radical/Molecule,Gas/Surface**
**	****Vapor Pressures****	****	****	****	****T= 77 - 2000 K**
**	****Henry’s Law Constants****	****	****	****Water/Sulfuric Acid/Others**
**	****Gas Phase Diffusion Constants****	****	****T = 77 - 2000 K**
**	****Liquid Phase Diffusion Constants****	****Water/Sulfuric Acid/Others**
**	****Thermochemical Parameters****	****	****T = 77 - 2000 K**
**	**

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## Atmospheric Measurements -Calibration Standards

**Standard****	****	****	****	****            Comments**
**	****Calibration Gases****	****	****	****	****     Precise, Stable Trace Gas Levels **
**	****	****	****	****	****     ****	****    ****	****	****          ****from 10 pptv to 10 ppmv**
**	**
**	****Radiometric Standards****	****	****	****     ********-wave, mm-wave, IR, VIS, UV**
**	****Solar Irradiance/Actinic Flux Standards****	****     Near IR, VIS, UV**
**	****Standard Particle Aerosols****	****	****	****     Monodisperse, 3 nm to 10 ********m,**
**	****	****	****	****	****     ****	****     ****	****	****          ****Selected Solids, Liquids, Mixtures**
**	****Isotopic Samples****	****	****	****	****     Gaseous/Liquid/Solid ****13****C/****12****C, D/H, ****	****	****	****	****	****     ****	****	****	****          ****15****N/****14****N, ****18****O/****16****/****17****/, ****34****S/****33****S/****32****S**

## Resource Allocation

**Panels of Atmospheric Scientists to Identify Critical Evaluated Data/Calibration Standard Needs:**
**	****Field Specific: Meteorology - In Situ Measurement - Remote Sensing, Etc.**
**	****Community Wide:  NIST/NOAA - Other Gov. - Academic - Private Sector**
**Directed, Multi-Agency Sponsored Parameter Measurement and Data Evaluation Programs - Use Data Evaluation Effort and Community Input **
**	****to Identify/Prioritize Key Parameter Uncertainties**
**Directed, Multi-Agency Sponsored Calibration Standard/Calibration Facility R&D Programs - Use Standards and Measurement Community Inputs to Identify/Prioritize Needs**
**Open Panels and Resulting Programs to Full Community.  Allocate R&D Funds Through Fair and Open Competition.  NIST and NOAA Should **
**	****Guide and Compete - Not Suck Dry.**
**	**