Impact of various air mass types on cloud condensation nuclei concentrations along coastal southeast Florida

Edwards, Eva Lou; Corral, Andrea F.; Dadashazar, Hossein; Barkley, Anne E.; Gaston, Cassandra J.; Zuidema, Paquita; Sorooshian, Armin

doi:10.1016/j.atmosenv.2021.118371

Cited by 12 publications

(24 citation statements)

References 132 publications

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“…Concentrations at 0.4% S were only 9.6%, 8.9%, and 12% higher for the three cases indicating a less soluble aerosol than for the M case. Higher CCN concentrations for cases with more biomass burning aerosol is consistent with results of CCN measurements made at Virginia Key, an island east of Miami, FL (Edwards et al., 2021).…”

Section: Resultssupporting

confidence: 83%

Wintertime Observations of Tropical Northwest Atlantic Aerosol Properties During ATOMIC: Varying Mixtures of Dust and Biomass Burning

et al. 2022

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The Atlantic Tradewind Ocean‐Atmosphere Mesoscale Campaign (ATOMIC) took place from 7 January to 11 July 2020 in the tropical North Atlantic between the east coast of Barbados and the Northwest Tropical Atlantic Station (NTAS) mooring. Measurements of aerosol chemical, microphysical, optical, and cloud‐nucleating properties were made during boreal winter onboard the NOAA RV Ronald H. Brown from 7 January to 13 February 2020. Observed aerosol properties indicate there were distinct periods when the aerosol was typical of clean marine conditions (particle number concentrations <400 cm−3, light absorption levels <1 Mm−1, and 222Rn concentrations <500 mBq m−3) and when there were intrusions of dust mixed to varying degrees with biomass burning aerosol. In comparison to the long‐term dust record at the Barbados Atmospheric Chemistry Observatory, the fraction of samples collected during ATOMIC with dust concentrations greater than 20 μg m−3 exceeded all years of the Barbados January to February record with the exception of 1983. The degree of mixing of the dust with biomass burning aerosol was modulated by the location of the North Atlantic subtropical high. A high located to the west of Africa led to a more northerly transport route and more dust‐like (MDL) aerosol arriving at the ship. A location of the high further to the east over northern Africa led to a more southerly transport route and more biomass burning aerosol mixed with the dust. Properties for the marine, MDL, and mixed dust and biomass burning aerosol are presented.

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Section: Resultssupporting

confidence: 83%

Wintertime Observations of Tropical Northwest Atlantic Aerosol Properties During ATOMIC: Varying Mixtures of Dust and Biomass Burning

et al. 2022

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“…PM 2.5 increased from ∼5 to 25-30 μg m −3 upon the arrival of smoke to New York City from wildfires over Alberta, Canada, with enhancements in OC, EC, and K + (Wu et al, 2018). Edwards et al (2021) showed a twofold increase in PM 2.5 when comparing BB days (9.54 μg m −3 ) to background days (4.26 μg m −3 ) in coastal southeast Florida. In contrast with the previous studies, Sapkota et al (2005) reported much higher PM 2.5 enhancements over Baltimore (8-fold increase relative to background) during the arrival of BB plumes from Quebec forest fires in July 2002, with the 24 h PM 2.5 concentration reaching as high as 86 μg m −3 .…”

Section: Surface Air Qualitymentioning

confidence: 92%

Biomass Burning Over the United States East Coast and Western North Atlantic Ocean: Implications for Clouds and Air Quality

et al. 2021

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“…Other studies have found that dust can commonly act as a cloud condensation nucleus even from the source, as it often has hygroscopic material, and thus can influence cloud formation (Twohy et al, 2009). In contrast to these findings, Denjean et al (2015) saw that African dust transported from Africa to the Caribbean Basin remained mainly externally mixed and that dust particles did not take up significant amounts of water when exposed to up to 94 % relative humidity, a similar finding to that of Edwards et al (2021) from African dust transported to Florida. The larger, super-micron dust particles act as giant CCN that can form large cloud droplets that lead to the earlier formation of raindrops (Rosenfeld et al, 2008).…”

Section: Introductionmentioning

confidence: 63%

Measurement report: Impact of African aerosol particles on cloud evolution in a tropical montane cloud forest in the Caribbean

2021

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Abstract. African aerosol particles, traveling thousands of kilometers before reaching the Americas and the Caribbean, directly scatter and absorb solar radiation and indirectly impact climate by serving as cloud condensation nuclei (CCN) or ice-nucleating particles (INPs) that form clouds. These particles can also affect the water budget by altering precipitation patterns that subsequently affect ecosystems. As part of the NSF-funded Luquillo Critical Zone Observatory, field campaigns were conducted during the summers of 2013 (23 d), 2014 (11 d), and 2015 (92 d) at Pico del Este, a site in a tropical montane cloud forest on the Caribbean Island of Puerto Rico. Cloud microphysical properties, which included liquid water content, droplet number concentration, and droplet size, were measured. Using products from models and satellites, as well as in situ measurements of aerosol optical properties, periods of high- and low-dust influence were identified. The results from this study suggest that meteorology and air mass history have a more important effect on cloud processes than aerosols transported from Africa. In contrast, air masses that arrived after passing over the inhabited islands to the southeast led to clouds with much higher droplet concentrations, presumably due to aerosols formed from anthropogenic emissions.

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Impact of various air mass types on cloud condensation nuclei concentrations along coastal southeast Florida

Cited by 12 publications

References 132 publications

Wintertime Observations of Tropical Northwest Atlantic Aerosol Properties During ATOMIC: Varying Mixtures of Dust and Biomass Burning

Wintertime Observations of Tropical Northwest Atlantic Aerosol Properties During ATOMIC: Varying Mixtures of Dust and Biomass Burning

Biomass Burning Over the United States East Coast and Western North Atlantic Ocean: Implications for Clouds and Air Quality

Measurement report: Impact of African aerosol particles on cloud evolution in a tropical montane cloud forest in the Caribbean

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