Regional Radiation Center (RRC) II (Asia)

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Presentation transcript:

Regional Radiation Center (RRC) II (Asia) Average vertical distribution of aerosols over Atmospheric Environment Observatory aquired by operational lidar system of JMA kohei HONDA Regional Radiation Center (RRC) II (Asia) Global Environment and Marine Department Japan Meteorological Agency (JMA) IPC-X / Japan

JMA Observation station for aerosol Phyrheriometers(14station） 1932～ Sunphotometer（3station） Ryori 1988/1～ Minamitorishima 1995/1～ Yonagunijima 1998/1～ Aerosol Lidar 　　　　Ryori　2002/3～　　　　Product Scattering Ratio Depolarization Ratio Extinction coefficient 　　　　Observation time 02-04, 08-09, 14-15, 20-22 (JST) Total 6hours/day IPC-X / Japan

JMA’s Observational lidar system specifications A/D resolution Sampling rate (MHz) 12 bit 20 Photon counting Analog Signal Processor R3237-01 (@607 nm) R3234-01 (@532 nm) Photomultiplier tube 607 Raman wavelength (nm) P and S Polarization 0.3-3.0 Field of view (mrad) 355 280 Telescope diameter (mm) Upper atmosphere Lower atmosphere Receiver 0.12 Beam divergence (mrad) 10 Pulse repetition (Hz) 300 Pulse energy (mJ) 532 Wavelength (nm) Transmitter Flashlamp pumped Q-switch Nd:YAG Type IPC-X / Japan

JMA’s operational lidar system bloc diagram IPC-X / Japan

Daily schedule and its time sequences of lidar operation IPC-X / Japan

An example of one-day quick-looking image Clear day 10 / 5 / 2005 Yellow sand 1 / 5 / 2005 Forest fire 23 / 5 /2003 IPC-X / Japan

Data selection (Vertical profiles of 3-month averaged scattering ratio) Night data No cloud day data(sky clear) Event data was delete yellow sand & forest fire Vertical resolution : 150m IPC-X / Japan

Characteristic of data (Vertical profiles of 3-month averaged scattering ratio) Autumn&Winter：aerosols is few Spring: middle troposphere was large Summer: boundary layer was large All seasons: The stratosphere aerosols is very few. IPC-X / Japan

Conclusion Average vertical distribution of aerosols data was characteristic at the seasons. Near future analysis of anther data. (satellite,sunphotometers ・　・　・stc. data） JMA is now planning to submit our aerosol lidar data to the World Data Centre for Aerosols (WDCA). 【Data publication】 [Annual Report on Atmospheric and Marine Environment Monitoring] IPC-X / Japan