Presentation is loading. Please wait.

Presentation is loading. Please wait.

4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research Development and Results from First Test-flights A collaboration involving: PNNL:

Published byAngel Reynolds Modified over 8 years ago

Similar presentations

Presentation on theme: "4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research Development and Results from First Test-flights A collaboration involving: PNNL:"— Presentation transcript:

1 4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research Development and Results from First Test-flights A collaboration involving: PNNL: C. Flynn, B. Schmid, C. Kluzek NASA Ames: S. Dunagan, R. Johnson, P. Russell, and J. Redemann NASA GSFC: B. Holben

2 4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research AERONET-like capability Ground-based direct beam + sky scanning yields column- integrated properties: AOD Size distributions Single-scattering albedo Asymmetry parameter Sphericity Cloud OD 4STAR: AATS-like capability: AOD at 13 wavelengths H 2 O horizontally and vertically resolved AATS-like capability: AOD at 13 wavelengths H 2 O horizontally and vertically resolved

3 Meet the family…4STAR(2012- AATS-6(1985-2001) AATS-14(1996-

4 4STAR Integration and test flights on PNNL/Battelle G-1, Aug-Sep 2010

5 Anticipated 4STAR data products: Solar Direct Beam Atmospheric Transmittance Aerosol Optical Depth and Ångstrom exponent Aerosol Extinction (via aircraft vertical profiling) Gases: H 2 O, O 3, NO 2, CO 2 (column and in profile) Angularly-resolved sky radiance inversions Scattering phase function, asymmetry parameter Aerosol size distributions, fine/coarse mode fraction Aerosol sphericity Aerosol absorption Zenith radiance cloud retrievals Cloudy/clear transition zone (Marshak, Chiu) Cloud Optical Depth, Droplet effective Radius (with auxilliary measurements, Barker et al.) Water vapor, liquid water, ice water fractionation (Daniels et al.)

6 4STAR and its Use…

7 Key Technological Hurdles Sun tracking across pressure differential Entrance window contamination Fiber optic couplings with <1% calibration stability (Connections/Rotation) Irradiance calibration to 1% over a period of months. Radiance calibration to a few percent. Stray light rejection: measure skylight down to within 3° of sun Sky scan within 100 seconds (10 km in flight) Stray light inside spectrometers

8 Ground Prototypes (4STAR-G)

9 Rotating Fiber Optics Coupling Throughput Repeatability

10 Radiance Calibration4STAR-Ground AERONET Cimel NASA Ames 30” Sphere

11 4STAR-Ground AERONET Cimel Jens Redemann Roy Johnson

12

13 Stray light rejection close to Sun - old barrel

14 Size Distribution Retrieval using AERONET Code

15 Sun Photometer Inter-Comparison Experiment Mauna Loa, Aug. 24 - Sep. 2 2008 4STAR Prede AATS-14 3 Cimels

16

17 Stray light inside Spectrometers 17

18 18 3 flights in Sep 2010: 1.Pilots only: Airworthiness certification 2.Science ops: Pasco, WA to San Jose, CA 3.Science ops: San Jose local Flights met all goals (sun tracking only). Large data set to guide improvements & test/demo flights in 2011. 3 flights in Sep 2010: 1.Pilots only: Airworthiness certification 2.Science ops: Pasco, WA to San Jose, CA 3.Science ops: San Jose local Flights met all goals (sun tracking only). Large data set to guide improvements & test/demo flights in 2011. max alt 5.7 km

19 Sun Tracking Performance 19 9/28/2010; SJC t/o ~10 am

20 Vertical profile of optical depth (normalized to top of layer) 20 (nm) 9/28/2010 SJC ~10 am

21 Key Technological Hurdles Sun tracking across pressure differential. Yes, some issues with glint Entrance window contamination. Not yet Fiber optic couplings with <1% calibration stability (Connections/Rotation). Yes Irradiance calibration to 1% over a period of months. Not yet Radiance calibration to a few percent. Yes Stray light rejection: measure skylight down to within 3° of sun. Yes Sky scan within 100 seconds (10 km in flight). Yes Stray light inside spectrometers. Yes

22 Next steps… In FY11: bring 4STAR to full science capability Install/characterize skylight optics Improve FOV uniformity of sun optics Make tracking immune to glint Adding temperature-stabilized enclosure for spectrometers and electronics Apply correction of stray light inside spectrometer Full characterization in test-flight series on G-1 in April, Jul, Sep Mauna Loa Calibration In FY12 Hardening and retrieval algorithms 4STAR/AATS-14 intercomparison flight on NASA P-3 DOE/ARM Mission on G-1, Cape Cod, Summer and Winter 2012 Funding: NASA, DOE ARM, BMI, PNNL

Download ppt "4STAR: Spectrometer for Sky-Scanning, Sun-Tracking Atmospheric Research Development and Results from First Test-flights A collaboration involving: PNNL:"

Similar presentations

Proposed new uses for the Ceilometer Network

Proposed new uses for the Ceilometer Network
Using a Radiative Transfer Model in Conjunction with UV-MFRSR Irradiance Data for Studying Aerosols in El Paso-Juarez Airshed by Richard Medina Calderón.

Using a Radiative Transfer Model in Conjunction with UV-MFRSR Irradiance Data for Studying Aerosols in El Paso-Juarez Airshed by Richard Medina Calderón.
Analysis of SPUV aerosol data for the May 2003 BBC2 campaign Piet Stammes Wouter Knap KNMI.

Analysis of SPUV aerosol data for the May 2003 BBC2 campaign Piet Stammes Wouter Knap KNMI.
May 10, 2004Aeronet workshop Can AERONET help with monitoring clouds? Alexander Marshak NASA/GSFC Thanks to: Y. Knyazikhin, K. Evans, W. Wiscombe, I. Slutsker.

May 10, 2004Aeronet workshop Can AERONET help with monitoring clouds? Alexander Marshak NASA/GSFC Thanks to: Y. Knyazikhin, K. Evans, W. Wiscombe, I. Slutsker.
The EvK2 Pyramid and the AERONET network “Atmospheric Brown Cloud Characterization via Sunphotometer Observations G.P. Gobbi, F. Barnaba, and F. Angelini.

The EvK2 Pyramid and the AERONET network “Atmospheric Brown Cloud" Characterization via Sunphotometer Observations G.P. Gobbi, F. Barnaba, and F. Angelini.
Constraining aerosol sources using MODIS backscattered radiances Easan Drury - G2

Constraining aerosol sources using MODIS backscattered radiances Easan Drury - G2
Ben Kravitz Tuesday, November 10, 2009 AERONET. What is AERONET? AErosol RObotic NETwork Worldwide collection of sun photometers.

Ben Kravitz Tuesday, November 10, 2009 AERONET. What is AERONET? AErosol RObotic NETwork Worldwide collection of sun photometers.
1 Cloud Droplet Size Retrievals from AERONET Cloud Mode Observations Christine Chiu Stefani Huang, Alexander Marshak, Tamas Várnai, Brent Holben, Warren.

1 Cloud Droplet Size Retrievals from AERONET Cloud Mode Observations Christine Chiu Stefani Huang, Alexander Marshak, Tamas Várnai, Brent Holben, Warren.
Figure 2.10 IPCC Working Group I (2007) Clouds and Radiation Through a Soda Straw.

Figure 2.10 IPCC Working Group I (2007) Clouds and Radiation Through a Soda Straw.
An Introduction to Using Angular Information in Aerosol Remote Sensing Richard Kleidman SSAI/NASA Goddard Lorraine Remer UMBC / JCET Robert C. Levy NASA.

An Introduction to Using Angular Information in Aerosol Remote Sensing Richard Kleidman SSAI/NASA Goddard Lorraine Remer UMBC / JCET Robert C. Levy NASA.
Single-Scattering Stuff + petty chap 12 intro April 27-29, 2015.

Single-Scattering Stuff + petty chap 12 intro April 27-29, 2015.
Direct Radiative Effect of aerosols over clouds and clear skies determined using CALIPSO and the A-Train Robert Wood with Duli Chand, Tad Anderson, Bob.

Direct Radiative Effect of aerosols over clouds and clear skies determined using CALIPSO and the A-Train Robert Wood with Duli Chand, Tad Anderson, Bob.
CINDI Workshop, BIRA, Brussels, 2010-3-10 Pandora Direct Sun Data during CINDI Alexander Cede Nader Abuhassan Jay Herman.

CINDI Workshop, BIRA, Brussels, Pandora Direct Sun Data during CINDI Alexander Cede Nader Abuhassan Jay Herman.
NASA Ames: P. Russell, J. Redemann, S. Dunagan, R. Johnson, J. Zavaleta PNNL: B. Schmid, C. Flynn, E. Kassianov NASA GSFC: AERONET Team A collaboration.

NASA Ames: P. Russell, J. Redemann, S. Dunagan, R. Johnson, J. Zavaleta PNNL: B. Schmid, C. Flynn, E. Kassianov NASA GSFC: AERONET Team A collaboration.
EARLINET and Satellites: Partners for Aerosol Observations Matthias Wiegner Universität München Meteorologisches Institut (Satellites: spaceborne passive.

EARLINET and Satellites: Partners for Aerosol Observations Matthias Wiegner Universität München Meteorologisches Institut (Satellites: spaceborne passive.
SeaDAS Training ~ NASA Ocean Biology Processing Group 1 Level-2 ocean color data processing basics NASA Ocean Biology Processing Group Goddard Space Flight.

SeaDAS Training ~ NASA Ocean Biology Processing Group 1 Level-2 ocean color data processing basics NASA Ocean Biology Processing Group Goddard Space Flight.
Lidar Intercomparion Study with Airborne Aerosol Optical Measurements near Tokyo on April 23, 2001 Toshiyuki Murayama Tokyo University of Mercantile Marine,

Lidar Intercomparion Study with Airborne Aerosol Optical Measurements near Tokyo on April 23, 2001 Toshiyuki Murayama Tokyo University of Mercantile Marine,
M. Van Roozendael, AMFIC Final Meeting, 23 Oct 2009, Beijing, China1 MAXDOAS measurements in Beijing M. Van Roozendael 1, K. Clémer 1, C. Fayt 1, C. Hermans.

M. Van Roozendael, AMFIC Final Meeting, 23 Oct 2009, Beijing, China1 MAXDOAS measurements in Beijing M. Van Roozendael 1, K. Clémer 1, C. Fayt 1, C. Hermans.
Solar Energy Part 1: Resource San Jose State University FX Rongère January 2009.

Solar Energy Part 1: Resource San Jose State University FX Rongère January 2009.
Mainly sampled Asian outflow in the Alaska phase local forest fire smoke in the Canada phase We expect these phases to represent the two extremes among.

Mainly sampled Asian outflow in the Alaska phase local forest fire smoke in the Canada phase We expect these phases to represent the two extremes among.

Similar presentations

Ads by Google