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Comparison of Preliminary 3β+2α microphysics with in situ measurements from PSAP/Nephelometer and PCASP 1 NASA Langley Research Center, Hampton, VA, USA 2 Lockheed-Martin, NASA Langley Research Center, Hampton, VA, USA 3 Science Systems and Applications, Inc., Hampton, VA, USA 4 Oak Ridge Associated Universities (ORAU), NASA Langley Research Center Hampton, VA, USA 5 NASA Goddard Institute for Space Studies, New York, NY, USA 6 NASA Ames Research Center, Moffett Field, CA, USA 7 Bay Area Environmental Research Institute NASA Ames Research Center, Moffett Field, CA, USA 8 Pacific Northwest National Laboratory, Richland, WA, USA Chris Hostetler 1 , Richard Ferrare 1 , John Hair 1 , Anthony Cook 1 , David Harper 1 , Terry Mack 2 , Rich Hare 1 , Craig Cleckner 1 , Ray Rogers 1 , Detlef Müller 3 , Eduard Chemyakin 4 , Sharon Burton 1 , Amy Jo Scarino 3 , Michael D. Obland 1 , Duli Chand 8 , Jason Tomlinson 8 , Brian Cairns 5 , Phil Russell 6 , Jens Redemann 6 , Yohei Shinozuka 7 , Beat Schmid 8 , Jerome Fast 8 , Larry Berg 8 , Connor Flynn 8 Airborne Multi-wavelength High Spectral Resolution Lidar Observations and Applications from TCAP NASA B200 King Air Extensive Aerosol Data Products (used in 3β+2α retrievals) Extinction 355, 532 nm Backscatter 355, 532, 1064 nm Intensive Aerosol Data Products (used for Aerosol Classification) Depolarization 355, 532, 1064 nm Depolarization spectral dependence 1064/532, 532/355 Backscatter spectral dependence 1064/532, 532/355 Extinction spectral dependence 532/355 Lidar Ratio 355, 532 nm Aerosol classification: two layers on 25 July 2012 Aerosol Backscatter (532 nm) Lidar Ratio (532 nm) Backscatter Angstrom (1064/532) Aerosol Classification Aerosol Depolarization (532 nm) Ratio of Depolarization (1064/532) Marine Urban Urban outflow indicated by high lidar ratio and larger backscatter angstrom (smaller particles) Marine indicated by low lidar ratio and small backscatter angstrom (large particles) HSRL-2 TCAP flight tracks HSRL-2 Introduction NASA Langley has developed the first airborne multi-wavelength high spectral resolution lidar (HSRL) instrument, “HSRL-2Follow-on to HSRL-1 flown on past ASR missions Prototype lidar for the NASA Aerosols-Clouds-Ecosystems (ACE) satellite mission The Two-Column Aerosol Project (TCAP) was the first deployment of HSRL-2 Data from TCAP are being used to retrieve vertically resolved aerosol microphysical parameters using the “3β + 2α" technique The 3β + 2α retrieval provides separate vertically-resolved profiles of scattering and absorption that are required for estimates of direct and semi-direct aerosol forcing and radiative heating Better quantification of aerosol type (via refractive index) and loading (via concentration) enables assessments of aerosol transport models Vertically-resolved retrievals of aerosol concentration and particle size enhance studies of aerosol-cloud interactions HSRL/AERONET AOT Comparison Acknowledgements: The authors thank the NASA Langley B200 King Air flight crew for their outstanding work supporting research flights. Support for the HSRL and RSP flight operations on TCAP was provided by the DOE ARM program: Interagency Agreement DE- SC0006730. Support for data analysis was provided in part by the DOE Atmospheric System Research (ASR) program. Support for the development of HSRL-2 was provided by the NASA Science Mission Directorate, ESTO, AITT, and Radiation Science Program. Summary and Conclusions Basic Level-2 Products Much higher laser energy and hence much higher Signal-to-Noise Ratio than HSRL-1 355 and 532 nm aerosol extinction validated via comparison to AERONET AOT Aerosol Classification Aerosol type full-curtain product provides context for composition measured in situ at G1 altitudes. Preliminary 3β + 2α retrieval of aerosol microphysics and optical properties Aerosol effective radius typically in good agreement with in situ measurements, but outliers exist Aerosol concentrations typically in good agreement with in situ Surface area concentration shows excellent agreement Number and volume concentrations have outliers Separation of total extinction into scattering and absorption Aerosol total scattering and extinction in good agreement with in situ measurements Absorption biased high relative to in situ measurements in some cases Overall: 3β + 2α aerosol microphysics products are preliminary . Work is underway to assess the products against in situ observations and improve the algorithms/software. Outlook: Advanced microphysical products (e.g., effective radius, concentration, scattering vs. absorption) and aerosol type from HSRL-2 provide full horizontally and vertically resolved curtains for extrapolating detailed information gathered in situ on G-1 aircraft for estimating aerosol microphysical evolution by type. 17 July 2012 • B200:16.0 UT • G1:15.7-16.0 UT 22 July 2012 • B200:16.8 UT • G1:16.8-17.0 UT 25 July 2012 • B200:14.7 UT • G1:14.9-15.1 UT Preliminary 3β+2α Microphysics retrieval using Inversion with Regularization: 17 July Aerosol Microphysics 1064 nm Backscatter 532 nm Backscatter 355 nm Backscatter 355 nm Extinction 532 nm Extinction Aerosol Backscatter 355 nm,532 nm,1064 nm Aerosol Extinction 355 nm, 532 nm + 2α Inversion with Regularization 3β Total Scattering Absorption Number Concentration Effective Radius Surface Area Concentration
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Transcript of NASA B200 King Air Airborne Multi-wavelength High...

  • Comparison of Preliminary 3+2 microphysics with in situ measurements from PSAP/Nephelometer and PCASP

    1NASA Langley Research Center, Hampton, VA, USA 2Lockheed-Martin, NASA Langley Research Center, Hampton, VA, USA 3Science Systems and Applications, Inc., Hampton, VA, USA 4Oak Ridge Associated Universities (ORAU), NASA Langley Research Center Hampton, VA, USA 5NASA Goddard Institute for Space Studies, New York, NY, USA 6NASA Ames Research Center, Moffett Field, CA, USA 7Bay Area Environmental Research Institute NASA Ames Research Center, Moffett Field, CA, USA 8Pacific Northwest National Laboratory, Richland, WA, USA

    Chris Hostetler1, Richard Ferrare1, John Hair1, Anthony Cook1, David Harper1, Terry Mack2, Rich Hare1,

    Craig Cleckner1, Ray Rogers1, Detlef Mller3, Eduard Chemyakin4, Sharon Burton1, Amy Jo Scarino3,

    Michael D. Obland1, Duli Chand8, Jason Tomlinson8, Brian Cairns5, Phil Russell6, Jens Redemann6,

    Yohei Shinozuka7, Beat Schmid8, Jerome Fast8, Larry Berg8, Connor Flynn8

    Airborne Multi-wavelength High Spectral Resolution Lidar

    Observations and Applications from TCAP

    NASA B200 King Air

    Extensive Aerosol Data Products (used in 3+2 retrievals)

    Extinction 355, 532 nm

    Backscatter 355, 532, 1064 nm

    Intensive Aerosol Data Products (used for Aerosol Classification)

    Depolarization 355, 532, 1064 nm

    Depolarization spectral dependence 1064/532, 532/355

    Backscatter spectral dependence 1064/532, 532/355

    Extinction spectral dependence 532/355

    Lidar Ratio 355, 532 nm

    Aerosol classification: two layers on 25 July 2012

    Aerosol Backscatter (532 nm)

    Lidar Ratio (532 nm)

    Backscatter Angstrom (1064/532)

    Aerosol Classification

    Aerosol Depolarization (532 nm)

    Ratio of Depolarization (1064/532)

    Marine

    Urban

    Urban outflow indicated by high lidar ratio and

    larger backscatter angstrom (smaller particles)

    Marine indicated by low lidar ratio and small

    backscatter angstrom (large particles)

    HSRL-2

    TCAP flight tracks

    HSRL-2

    Introduction

    NASA Langley has developed the first airborne multi-wavelength high spectral resolution lidar (HSRL) instrument, HSRL-2

    Follow-on to HSRL-1 flown on past ASR missions Prototype lidar for the NASA Aerosols-Clouds-Ecosystems

    (ACE) satellite mission

    The Two-Column Aerosol Project (TCAP) was the first deployment of HSRL-2

    Data from TCAP are being used to retrieve vertically resolved aerosol microphysical parameters using the 3 + 2" technique

    The 3 + 2 retrieval provides separate vertically-resolved profiles of scattering and absorption that are required for

    estimates of direct and semi-direct aerosol forcing and

    radiative heating

    Better quantification of aerosol type (via refractive index) and loading (via concentration) enables assessments of

    aerosol transport models

    Vertically-resolved retrievals of aerosol concentration and particle size enhance studies of aerosol-cloud interactions

    HSRL/AERONET AOT Comparison

    Acknowledgements:

    The authors thank the NASA

    Langley B200 King Air flight

    crew for their outstanding

    work supporting research

    flights. Support for the HSRL

    and RSP flight operations on

    TCAP was provided by the

    DOE ARM program:

    Interagency Agreement DE-

    SC0006730. Support for data

    analysis was provided in part

    by the DOE Atmospheric

    System Research (ASR)

    program. Support for the

    development of HSRL-2 was

    provided by the NASA

    Science Mission Directorate,

    ESTO, AITT, and Radiation

    Science Program.

    Summary and Conclusions

    Basic Level-2 Products

    Much higher laser energy and hence much higher Signal-to-Noise Ratio than HSRL-1 355 and 532 nm aerosol extinction validated via comparison to AERONET AOT Aerosol Classification

    Aerosol type full-curtain product provides context for composition measured in situ at G1 altitudes.

    Preliminary 3 + 2 retrieval of aerosol microphysics and optical properties

    Aerosol effective radius typically in good agreement with in situ measurements, but outliers exist

    Aerosol concentrations typically in good agreement with in situ Surface area concentration shows excellent agreement Number and volume concentrations have outliers

    Separation of total extinction into scattering and absorption Aerosol total scattering and extinction in good agreement with in situ measurements Absorption biased high relative to in situ measurements in some cases

    Overall: 3 + 2 aerosol microphysics products are preliminary. Work is underway to assess the products against in situ observations and improve the

    algorithms/software.

    Outlook: Advanced microphysical products (e.g., effective radius, concentration,

    scattering vs. absorption) and aerosol type from HSRL-2 provide full horizontally and

    vertically resolved curtains for extrapolating detailed information gathered in situ on G-1

    aircraft for estimating aerosol microphysical evolution by type.

    17 July 2012 B200:16.0 UT G1:15.7-16.0 UT 22 July 2012 B200:16.8 UT G1:16.8-17.0 UT 25 July 2012 B200:14.7 UT G1:14.9-15.1 UT

    Preliminary 3+2 Microphysics retrieval using Inversion with Regularization: 17 July Aerosol Microphysics

    1064 nm Backscatter

    532 nm Backscatter

    355 nm Backscatter

    355 nm Extinction

    532 nm Extinction

    Aerosol Backscatter

    355 nm,532 nm,1064 nm

    Aerosol Extinction

    355 nm, 532 nm +

    2

    Inversio

    n w

    ith R

    egula

    rizatio

    n

    3

    Total

    Scattering

    Absorption

    Number

    Concentration

    Effective

    Radius

    Surface Area

    Concentration