University of Arizona
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Data from "What are the similarities and differences in marine boundary layer cloud and drizzle microphysical properties during the ACE-ENA and MARCUS field campaigns?"

posted on 2023-08-29, 13:26 authored by Alexa Renee MarcovecchioAlexa Renee Marcovecchio, Baike Xi, Xiaojian Zheng, Peng WuPeng Wu, Xiquan Dong, Ali Behrangi

Data used to generate figures and calculations for the publication "What are the similarities and differences in marine boundary layer cloud and drizzle microphysical properties during the ACE-ENA and MARCUS field campaigns?" This study investigates cloud and drizzle microphysics during the MARCUS field campaign in the Southern Ocean and the ACE-ENA field campaign in the Azores. This data is produced by a retrieval algorithm that decomposes cloud and drizzle vertical profiles observed by surface-based remote sensors.

This study compares macrophysical and microphysical properties of single-layered, liquid-dominant MBL clouds from the Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean (MARCUS) (above 60°S) and the ARM East North Atlantic (ENA) site during the Aerosol and Cloud Experiments in Eastern North Atlantic (ACE-ENA) field campaign. A total of 1,136 (16.5% of clouds) and 6,034 5-min cloud samples are selected from MARCUS and ARM ENA in this study. MARCUS clouds have higher cloud-top heights, thicker cloud layers, larger liquid water path, and colder cloud temperatures than ENA. Thinner, warmer MBL clouds at ENA can contain higher layer-mean liquid water content due to higher cloud and ocean surface temperatures along with greater precipitable water vapor (PWV). MARCUS has a higher drizzle frequency rate (71.8%) than ENA (45.1%). Retrieved cloud and drizzle microphysical properties from each field campaign show key differences. MARCUS clouds feature smaller cloud droplets, whereas ENA clouds have larger cloud droplets, especially at the upper region of the cloud. From cloud top to cloud base, drizzle drop sizes increase while number concentrations decrease. Drizzle drop radius and number concentration decrease from cloud base to drizzle base due to net evaporation, and MARCUS’ lower specific humidity leads to a higher drizzle base than ENA. The broader surface pressure and lower tropospheric stability (LTS) distributions during MARCUS have demonstrated that there are different synoptic patterns for selected cases during MARCUS with less PWV, while ENA is dominated by high pressure systems with nearly doubled PWV.

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Collaborative Research: Contrasting the Effects of Aerosols on Marine Boundary Layer (MBL) Cloud-precipitation Properties and Processes in Boreal and Austral Mid-latitude Regions

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Pacific Northwest National Laboratory is operated for the Department of Energy by Battelle Memorial Institute under Contract DE-AC05-76 RL01830


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