HR: 1330h
AN: A22B-1065    [PDF]
TI: Cavity Ring-Down Measurement of Aerosol Optical Properties During the Asian Dust Above Monterey Experiment and DOE Aerosol Intensive Operating Period
AU: * Ricci, K
EM: kricci@mail.arc.nasa.gov
AF: Bay Area Environmental Research, MS 245-4, Moffett Field, CA 94035 United States
AU: Strawa, A W
EM: astrawa@mail.arc.nasa.gov
AF: NASA Ames Research Center, MS 245-4, Moffett Field, CA 94035 United States
AU: Provencal, R
EM: provencal@picarro.com
AF: Picarro, Inc, 480 Oakmead Parkway, Sunneyvale, CA 94085 United States
AU: Castaneda, R
EM: rcastaneda@mail.arc.nasa.gov
AF: NASA Ames Research Center, MS 245-4, Moffett Field, CA 94035 United States
AU: Bucholtz, A
EM: bucholtz@nrlmry.navy.mil
AF: Naval Research Laboratory, 7 Grace Hopper Street, Stop 2, Monterey,, CA 93943 United States
AU: Schmid, B
EM: bschmid@mail.arc.nasa.gov
AF: Bay Area Environmental Research, MS 245-4, Moffett Field, CA 94035 United States
AB: Large uncertainties in the effects of aerosols on climate require improved in-situ measurements of extinction coefficient and single-scattering albedo. This paper describes preliminary results from Cadenza, a new continuous wave cavity ring-down (CW-CRD) instrument designed to address these uncertainties. Cadenza measures the aerosol extinction coefficient for 675 nm and 1550 nm light, and simultaneously measures the scattering coefficient at 675 nm. In the past year Cadenza was deployed in the Asian Dust Above Monterey (ADAM) and DOE Aerosol Intensive Operating Period (IOP) field projects. During these flights Cadenza produced measurements of aerosol extinction in the range from 0.2 to 300 Mm-1 with an estimated precision of 0.1 Mm-1 for 1550 nm light and 0.2 Mm-1 for 675 nm light. Cadenza data from the ADAM and Aerosol IOP missions compared favorably with data from the other instruments aboard the CIRPAS Twin Otter aircraft and participating in those projects. We present comparisons between the Cadenza measurements and those from a TSI nephelometer, Particle Soot Absorption Photometer (PSAP), and the AATS14 sun-photometer. Measurements of the optical properties of smoke and dust plumes sampled during these campaigns are presented and estimates of heating rates due to these plumes are made.
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 0368 Troposphere--constituent transport and chemistry
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting