Measurements from the RV &amp;lt;i&amp;gt;Ronald H. Brown&amp;lt;/i&amp;gt; and related platforms as part of the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC)

Quinn, Patricia K.; Thompson, Elizabeth; Coffman, D. J.; Baidar, Sunil; Bariteau, Ludovic; Bates, T. S.; Bigorre, Sébastien P.; Brewer, Alan; Boer, Gijs de; Szoeke, Simon P. de; Drushka, Kyla; Foltz, Gregory R.; Intrieri, J. M.; Iyer, Suneil; Fairall, C. W.; Gaston, Cassandra J.; Jansen, Friedhelm; Johnson, James E.; Krüger, Ovid O.; Marchbanks, Richard D.; Moran, K. P.; Noone, David; Pezoa, Sergio; Pincus, Robert; Plueddemann, Albert J.; Pöhlker, Mira L.; Pöschl, Ulrich; Meléndez, Estefanía Quiñones; Royer, Haley M.; Szczodrak, M.; Thomson, Jim; Upchurch, L.; Zhang, Chidong; Zhang, Dongxiao; Zuidema, Paquita

doi:10.5194/essd-13-1759-2021

Cited by 38 publications

(58 citation statements)

References 44 publications

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“…These distributions show that the aerosol particle size distribution at Ragged Point during the campaign were relatively invariant and 220 always contained the same modes centred at about 0.04, 0.15 and 1.5 µm. The mode at 0.15 µm is probably associated with sea spray, whereas the 0.04 µm was probably associated with new particle formation events [Quinn et al, 2021;Wex et al, 2016]. The mode at 1.5 µm is associated with mineral dust, which is similar to the mode centred at 2.0 µm associated with mineral dust in the Amazon [Moran-Zuloaga et al, 2018].…”

Section: Characterisation Of Aerosol In Barbados During the Campaignmentioning

confidence: 62%

The ice-nucleating activity of African mineral dust in the Caribbean boundary layer

Harrison

O’Sullivan

Adams

et al. 2022

Preprint

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Abstract. African mineral dust is transported many thousands of kilometres from its source regions and, because of its ability to nucleate ice, it plays a major role in cloud glaciation around the globe. The ice-nucleating activity of desert dust is influenced by its mineralogy, which varies substantially between source regions and across particle sizes. However, in models it is often assumed that the activity (expressed as active sites per unit surface area as a function of temperature) of atmospheric mineral dust is the same everywhere on the globe. Here, we find that the ice-nucleating activity of African desert dust sampled in the summertime marine boundary layer of Barbados (July and August, 2017) is substantially lower than parameterizations based on soil from specific locations in the Saharan desert or dust sedimented from dust storms. We conclude that the activity of dust in Barbados’ boundary layer is primarily defined by the low K-feldspar content of the dust, which is around 1 %. We propose that the dust we sampled in the Caribbean was from a region in West Africa (in and around the Sahel in Mauritania and Mali), which has a much lower feldspar content than other African sources across the Sahara and Sahel.

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Section: Characterisation Of Aerosol In Barbados During the Campaignmentioning

confidence: 62%

The ice-nucleating activity of African mineral dust in the Caribbean boundary layer

Harrison

O’Sullivan

Adams

et al. 2022

Preprint

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“…Leg 1 deployments were made in the northeastern part of the study area and Leg 2 deployments were made in the southwestern part of the study area. Details of these deployments and other measurements that were made during ATOMIC from the NOAA Ship Ronald H. Brown or other oceanic platforms are included in Quinn et al (2021).…”

Section: Swift Observationsmentioning

confidence: 99%

Variations in Wave Slope and Momentum Flux From Wave‐Current Interactions in the Tropical Trade Winds

et al. 2022

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Observations from six Lagrangian Surface Wave Instrument Float with Tracking drifters in January‐February 2020 in the northwestern tropical Atlantic during the Atlantic Tradewind Ocean‐atmosphere Mesoscale Interaction Campaign are used to evaluate the influence of wave‐current interactions on wave slope and momentum flux. At observed wind speeds of 4–12 ms−1, wave mean square slopes are positively correlated with wind speed. Wave‐relative surface currents varied significantly, from opposing the wave direction at 0.24 ms−1 to following the waves at 0.47 ms−1. Wave slopes are 5%–10% higher when surface currents oppose the waves compared to when currents strongly follow the waves, consistent with a conservation of wave energy flux across gradients in currents. Assuming an equilibrium frequency range in the wave spectrum, wave slope is proportional to wind friction velocity and momentum flux. The observed variation in wave slope equates to a 10%–20% variation in momentum flux over the range of observed wind speeds (4–12 ms−1), with larger variations at higher winds. At wind speeds over 8 ms−1, momentum flux varies by at least 6% more than the variation expected from current‐relative winds alone, and suggests that wave‐current interactions can generate significant spatial and temporal variability in momentum fluxes in this region of prevailing trade winds. Results and data from this study motivate the continued development of fully coupled atmosphere‐ocean‐wave models.

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“…More details about all atmospheric and oceanic measurements onboard, deployment of uncrewed assets, and interplatform comparisons can be found in Quinn et al. (2021).…”

Section: Resultsmentioning

confidence: 99%

“…The ship then transited downwind to Station 3, 20 NM upwind of the Barbados Cloud Observatory (BCO) and Barbados Atmospheric Chemistry Observatory (BACO), for an interplatform comparison of aerosol, cloud, and meteorological parameters. Results of the comparison, which was conducted from 24 January 18:20 to 25 January 23:40 UTC, were reported byQuinn et al (2021).…”

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confidence: 99%

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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Measurements from the RV <i>Ronald H. Brown</i> and related platforms as part of the Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign (ATOMIC)

Cited by 38 publications

References 44 publications

The ice-nucleating activity of African mineral dust in the Caribbean boundary layer

The ice-nucleating activity of African mineral dust in the Caribbean boundary layer

Variations in Wave Slope and Momentum Flux From Wave‐Current Interactions in the Tropical Trade Winds

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

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