Vertically resolved aerosol optical properties over the ARM SGP site B. Schmid, H. Jonsson, A. Strawa, B. Provencal, K. Ricci, D. Covert, R. Elleman, W.

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Presentation transcript:

Vertically resolved aerosol optical properties over the ARM SGP site B. Schmid, H. Jonsson, A. Strawa, B. Provencal, K. Ricci, D. Covert, R. Elleman, W. P. Arnott, A. Bucholtz, P. Pilewskie, J. Pommier, T. Rissman, T. VanReken, J. Wang, J. Seinfeld, R. Flagan, J. Redemann, J. Eilers, R. Ferrare, E. J. Welton, and many others Photo from Roy Woods

Aerosol: number, size distr., extinction, scattering (cavity ring-down), absorption (photoacoustic) hygroscopicity, aerosol optical depth Gases: Water vapor Cloud: liquid water, droplet size distribution, CCN Radiation: solar and IR, up and downwelling, broadband and spectral Stabilized platform Flew 60.6 flight hours during 16 flights on 15 days CIRPAS Twin Otter ARM Aerosol IOP – May 2003

Photo courtesy Yin-Nan Lee, BNL Raman Lidar Disclaimer: Talk covers only small subset of IOP data. All results are preliminary SMART trailer (Tsay, Ji)

NASA Ames Airborne Tracking Sunphotometer AATS-14: nm Aerosol Optical Depth and H 2 O column Aerosol Extinction and H 2 O density in suitable profiles

H 2 O Density Comparisons (all flights) AATS-14 vs. in situRaman Lidar (< 3km) vs. in situ

In situ measurement of Extinction = Absorption Particle Soot Absorption Photometer (PSAP) =467, 530, 660 nm low RH Corrections (Bond et al., 1999) –scattering contribution –… –inlet-cutoff (D a =8  m)* –correct to ambient RH* Scattering Nephelometers –TSI: = 450, 550, 700 nm, low RH –RR: = 540 nm, RH=20,60,85% Corrections (Anderson & Ogren, 1998) –light source –angular truncation (7°-170°) –inlet-cutoff (D a =8  m)* –correct to ambient RH + * correction not required or done Measurements: D. Covert & R. Elleman

I in (t) ring-down cavity I out (t) time Cavity Ring-Down -The Ping-Pong Model A. Strawa, K. Ricci, B. Provencal

Elevated layer as seen from Twin Otter on May 27, 2003 Photo courtesy of Roy Woods

R. Husar,

MODIS 5/14/2003