Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/62192

Characterization of Marine Stratocumulus Clouds and Aerosol-Cloud Interactions During Oracles.

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Title:Characterization of Marine Stratocumulus Clouds and Aerosol-Cloud Interactions During Oracles.
Authors:Heikkila, Ashley C.
Contributors:Atmospheric Sciences (department)
Date Issued:Aug 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:ORACLES (ObseRvations of Aerosols above CLouds and their
intEractionS) is a 3-year field campaign taking place during the months of
August, September, and October in the years 2017, 2016, and 2018,
respectively, off the coasts of Namibia and São Tomé in the southeastern
Atlantic (SEA). The purpose of this campaign is to study the effects of
biomass burning aerosols (BBA) on climatologically important stratocumulus
clouds. For this project, we focus on data collected during the 2016 field
deployment and specifically focus on in-cloud data collected with the Flight
Probe Dual Range - Phase Doppler Interferometer (FPDR-PDI) aboard the
NASA P-3 aircraft. The FPDR-PDI has the ability to measure microphysical
cloud properties such as instantaneous cloud drop size, cloud drop
concentration, drop size distributions and liquid water content. In addition,
we used black carbon (BC) measurements from the Single Particle Soot
Photometer (SP2) to characterize aerosol and cloud properties during the
flight.
We found that for the high BC level leg segments, cloud properties
exhibited characteristics of the 1st Indirect Effect. The median diameter for
all of the level legs combined was 14.6 μm. The median diameter was found to
be 12.81 μm for the high BC cases, and 15.39 μm for the low BC cases, which
indicates a shift of the size distribution to smaller droplet sizes with more
“polluted” clouds and to larger droplet sizes for the “clean” clouds. The
median effective radius for the high BC cloud legs was 9.02 μm and 11.43 μm
for the low BC cloud legs. Overall, total number concentration (TNC)
increased with BC, with the mean shifting downwards toward lower TNC
with the low BC cases, and upwards towards higher TNC with the high BC
cases.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2018.
URI:http://hdl.handle.net/10125/62192
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Atmospheric Sciences


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