1 / 19

(IPCC, 2001)

8th Circumpolar Symposium on Remote Sensing of Polar Environments, 8-12 June 2004, Chamonix, France. Long-term monitoring of the tropospheric aerosol vertical structure and optical properties by active and passive remote-sensing at Ny-Aalesund, Svalbard

milly
Download Presentation

(IPCC, 2001)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 8th Circumpolar Symposium on Remote Sensing of Polar Environments, 8-12 June 2004, Chamonix, France Long-term monitoring of the tropospheric aerosol vertical structure and optical properties by active and passive remote-sensing at Ny-Aalesund, Svalbard M. Shiobara1), M. Yabuki 1), R. Neuber 2), E.J. Welton 3), T.A. Berkoff 3), J.R. Campbell 3), and J.D. Spinhirne 3) 1) National Institute of Polar Research, Tokyo, Japan 2) Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany 3) NASA Goddard Space Flight Center, Greenbelt, MD, USA

  2. (IPCC, 2001)

  3. Objectives of aerosol remote sensing in the Arctic 1. Climatology of aerosol optical/physical properties in the Arctic: # Aerosol optical depth # Aerosol size distribution # Single scattering albedo # Scattering phase function 2. Aerosol-cloud interaction: # Arctic haze and arctic stratus clouds # Formation and dissipation processes of aerosol and clouds 3. Contribution to MPLNET: # Data transfer to the NASA/GSFC aerosol/cloud group # Validation of satellite retrievals from ICESat/GLAS

  4. Ny-Alesund Location of the NIPR Arctic Observation Site

  5. Ny-Aalesund, a unique international research site in Svalbard

  6. All-sky camera Sky-radiometer Anemometer Thermometer X-band 10GHz radar POSS Microwave radiometer Remote-sensing instrumentation for atmospheric research at Rabben NIPR Rabben Observatory is located 1.5km west of downtown Ny-Aalesund

  7. Sky radiometer, Prede POM-01 Specifications Wavelength 315, 400, 500, 675, 870, 940, 1020 nm Monochromator Narrow-band interference filter FWHM of filter 3 nm for 315, 10 nm for others Detector Silicon photodiode Elec. dynamic range 107 FOV angle 1 deg in full angle Ambient environment -30 to +35 ℃ (sensor unit) 0 to +35 ℃ (control unit) [ Analysis method ] Sky-radiance inversion method, SKYRAD ( Nakajima et al., 1996 )

  8. Haze Background ( a ) 23 March 2000 ( b ) 17 April 2000 Volume size distribution for the haze and background days during the ASTAR 2000 campaign. The number of the smaller particles for the haze case was larger than that for the background case.

  9. Cloud detection from all-sky images All-sky image over Ny-Alesund on 30 May 2004, 13UTC All-sky camera with a fish-eye lens

  10. MPL operated at NIPR Rabben Observatory since March 1998 until June 2003 Micro-Pulse Lidar (MPL) Specifications Laser Diode-pumped Nd/YLF laser Wavelength 523 nm Pulse energy 8-10 mJ Pulse frequency 2500 Hz Detector Single photon counting APD Range resolution 30 m MPL operated at AWI Koldewey Station since June 2003 to present Micro-Pulse Lidar System in Ny-Alesund, Svalbard

  11. Range corrected relative backscatter profile and the temporal variation over Ny-Alesund on 13 May 2004

  12. 5 4 3 Altitude (km) 2 1 0 25 (18:00) 26 (06:00) 26 (12:00) 25 (12:00) 26 (00:00) March 2000 Cloud formation process associated with development of a haze layer Vertical structure and temporal variation of aerosol and cloud layer observed by a Micro-Pulse Lidar at Ny-Aalesund, Svalbard

  13. Analysis of passive/active remote sensing using sky-radiometer and MPL Analysis focuses on the difference of aerosol optical properties for the haze condition and for the background condition in the Arctic. HZ : Averaged optical thickness > 0.1 BG : Averaged optical thickness < 0.07 Sky-radiometer MPL Single scattering albedo Vertical profile of the extinction coefficient Size distribution Optical thickness Angstrom parameter τ- matching method S1 parameter (Lidar ratio)

  14. Aerosol optical depth Angstrom parameter Results from ASTAR 2000 campaign 1. AOD: HZ>0.1, BG<0.07 2. Angstrom parameter: HZ>BG 3. Single scattering albedo: HZ=BG AOD of arctic haze became larger with contribution of small particles such as sulfate aerosol. Sometimes arctic haze includes absorptive aerosol such as soot. Single scattering albedo

  15. absorptive aerosol? (a) (b) Fig. (a): Relation between the τ(523 nm) and S1 parameter at 523 nm. S1 parameter has a positive correlation with the optical depth τ(523nm). The averaged S1 parameter of the background case (BG) is 11.4 sr and that of the haze case (HZ) is 21.2 sr. Fig. (b) shows the relation between the Angstrom parameter and S1 parameter.

  16. MPLNET Sites Ny-Alesund (79N, 12E) Syowa (69S, 40E) MPLNET is operated by NASA/GSFC and participating partners including NIPR’s polar sites (From http://mplnet.gsfc.nasa.gov)

  17. Ice, Cloud, and land Elevation Satellite ICESat/GLAS Geoscience Laser Altimeter System Launched on 12 January 2003

  18. ICESat/GLAS Tracks of ICESat MPL, Ny-Alesund All-sky image ICESat/GLAS passed over Ny-Alesund on 21 May 2004, around 01:40 UTC

  19. 8th Circumpolar Symposium on Remote Sensing of Polar Environments, 8-12 June 2004, Chamonix, France Summary • Combined remote sensing with active/passive instruments is being continued at Ny-Aalesund, Svalbard for the atmospheric environment research in the Arctic. • Aerosol optical properties and their vertical/temporal variations are investigated for their climate impact based on long-term monitoring with Sky-Radiometer and Micro-Pulse Lidar. • These measurements are expected to also contribute to ground validation of satellite aerosol/cloud retrievals from space-borne active sensors such as ICESat/GLAS. Acknowledgments: Operations of MPL at Rabben Station in Ny-Alesund until June 2003 were helped by the on-site engineers of Norwegian Polar Institute. Operations of MPL at Koldewey Station since June 2003 were helped by the on-site engineers of Alfred Wegener Institute for Polar and Marine Research.

More Related