Simultaneous observation of aerosols in the planetary boundary layer by using Kytoon and Lidar

Simultaneous observation of aerosols in the planetary boundary layer by using Kytoon and Lidar

J.Am,solScr Vol.29,Suppl. l,pp.S1215-Sl216. 1998 0 1998 Published by Elsevier Science Ltd. All rights reserved Printed in Great Britain 0021.8502/98 $...

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J.Am,solScr Vol.29,Suppl. l,pp.S1215-Sl216. 1998 0 1998 Published by Elsevier Science Ltd. All rights reserved Printed in Great Britain 0021.8502/98 $19.00 + 0.00

Pergamon

SIMULTANEOUS

OBSERVATION OF AEROSOLS IN THE PLANETARY LAYER BY USING KYTOON AND LIDAR

BOUNDARY

K. MIURA”, M. YABUKI”, M. ICHIKAWA”, S. NAKAE”, H. KOJIMA”, N. TAKEUCHI”, H. KUZE’!, H. KINJO”, and N. [email protected]’ I’ Department of Physics, Faculty of Science, Science University of Tokyo, l-3 Kagurazaka, Shinjuku-ku, Tokyo 162, Japan [email protected] ‘I Department of Liberal Arts, Faculty of Science and Technology, Science University ‘) Center for Environmental Remote Sensing (CEReS), Chiba University

of Tokyo

KEYWORDS Kytoon, Lidar, OPC, EDX, extinction coefficient, refractive index, chemical composition

It is very important to characterize atmospheric aerosols to know their effects on the radiative transfer. However, their inlormation is insufticient, so we can not know the effects in detail. There are a few differences between values of aerosol properties in a vertical column obtained by solar observation and those on surface, so it is necessary to add the information of aerosol vertical profile and chemical composition rate. In this work, we observed aerosol behaviors in the planetary boundary layer (O-350 m) by using kytoon system and lidar simultaneously. Observation was pert’ormed at a campus of Science University of Tokyo (35”54’50”N, 139”54’30”E), which is about 30 km northeastern of Tokyo, during 16-19 October 1997. Kytoon (about 7 mi in volume), which alternately loaded an optical particle counter (OPC; RION Co., KM07), a portable sampler consisting of a low-pressure cascade impactor (PIXE Int. Corp., Model I-1L) and a mini pump (Shibata Co., MP-303) or a meteorological sonde, was ascended and descended repeatedly up to 350 m as a rule on the roof of the first building (12 m in height). Aerosol particles greater than 0.15 and 0.25 pm in radius were counted with the KM07 and temperature and relative humidity were measured with the sonde for 1 min at every 50 m. Aerosol particles were collected directly on a carbon-covered nitrocellulose grid by using two impactors for 5 min at the highest level and on the roof at the same time. Solar observation was automatically measured by using an aureole meter (PREDE Co., POM-01; h=315, 400, 500, 870, 940,104O nm) and a radio spectrometer (OPT0 Research Corp., MSR7000; h=280-2500 nm, every 5 nm) on the roof. Movable lidar (Nd:YAG laser, A=532 nm), which was designed by CEReS group, was set up in the face of a north side window at the laboratory room on the highest lloor. The other OPC (RION Co., KCOl; r>0.15, 0.25, 0.5, 1, 2.5 urn), a CNC (TSI, Model 3022A; r>0.007 pm), and a nepherometer (Radiance Research Co., MY03; A=530 nm) were set up at the room. Surface meteorological elements were measured at the meteorological field near the building Coincidence loss of particle concentration (No) measured with the OPCs was corrected: N,, = N exp (-NV), where N and v are real concentration and a sensing volume. Threshold voltages of channels of the OPCs are set with polystyrene latex spheres, the refractive index (m) of which is 1.595. Setting radii of two OPCs were corrected for a more s1215

Abstracts

S1216

of the 5th International

Aerosol

Conference

19%

realistic index by calculating the response. After the corrections, size distributions were calculated. We assumed that the values at rmincrc0.15 pm extrapolated the Junge distribution and kept a constant value at r
1997.10.18 350 300

at

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1000 (cIT-~)

Fig. 1. Vertical profile of the concentration measured with the KM07. ACKNOWLEDGEMENTS This work was carried out by the joint research program of CEReS, Chiba University (9-3).