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Aerosol-Cloud Interactions from Hawaii's Kīlauea Volcano.

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Title:Aerosol-Cloud Interactions from Hawaii's Kīlauea Volcano.
Authors:Yamamoto, Kayla K. L.
Contributors:Atmospheric Sciences (department)
Keywords:Aerosol indirect effects
sulfate aerosols
volcanic emissions
Date Issued:Aug 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:Aerosols, clouds, and their interactions play significant roles in both the Earth’s
radiative budget and hydrological cycle. Therefore, it is necessary to establish
meaningful relationships between aerosols, clouds, and climate in order to improve
our understanding of global climate change. However, due to the complex feedbacks
involved, aerosol-cloud interactions (ACI) remain poorly understood and account for
much of the current uncertainty in global climate models. Kīlauea volcano on the
Big Island of Hawaii provides a unique opportunity to study ACI in a setting where
sulfur is continuously emitted into a clean marine boundary layer. This natural
laboratory allows for a simplified analysis of ACI in warm trade wind cumulus
downwind of Kīlauea volcano. Furthermore, we address the complication of
orographic effects in investigating changes in cloud properties downwind of the
Hawaiian Islands. This is an important distinction from previous Hawaii studies,
which have attributed changes in cloud properties to either ACI or orographic
effects. Instead, we propose a combined ACI and orographic effect and include both
within our analysis.
In this study, we combine Level-2 Collection 6 cloud properties from the
MODerate-Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua
platform, together with Vog model results from the Vog Measurement and
Prediction (VMAP) project to compare clouds within the Kīlauea aerosol plume to
nearby clouds located out of the aerosol plume (both pristine and orographic). From
the 127 MODIS cases selected during the months of June, July, and August from
2011 – 2017, we found clouds located within the Kīlauea aerosol plume to have
smaller droplets, increased thickness, increased liquid water content, higher cloud
tops, and increased fractional coverage compared to out of plume clouds. These
findings agree with previous Kīlauea studies and provide evidence for the first and
second indirect effects.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2018.
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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