scholarly journals On the budget of photooxidants in the marine boundary layer of the tropical South Atlantic

1999 ◽  
Vol 104 (D7) ◽  
pp. 8039-8046 ◽  
Author(s):  
Wolfgang Junkermann ◽  
William R. Stockwell
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
South Atlantic

Variability of the atmospheric electric field in the South Atlantic marine boundary layer from the SAIL campaign

2021 ◽  
Author(s):  
Susana Barbosa ◽  
Mauricio Camilo ◽  
Carlos Almeida ◽  
Guilherme Amaral ◽  
Nuno Dias ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Electric Field ◽  
Buenos Aires ◽  
Marine Boundary Layer ◽  
South Atlantic ◽  
Atmospheric Electric Field ◽  
Surface Ionization ◽  
Diurnal Pattern ◽  
The South ◽  
Near Surface

<p>The marine boundary layer offers a unique opportunity to investigate the electrical properties of the atmosphere, as the effect of natural radioactivity in driving near surface ionization is significantly reduced over the ocean, and the concentration of aerosols is also typically lower than over land. This work addresses the temporal variability of the atmospheric electric field in the South Atlantic marine boundary layer based on measurements from the SAIL (Space-Atmosphere-Ocean Interactions in the marine boundary Layer) project. The SAIL monitoring campaign took place on board the Portuguese navy tall ship NRP Sagres during its circumnavigation expedition in 2020.  Two identical field mills (CS110, Campbell Scientific) were installed on the same mast but at different heights (about 5 and 22 meters), recording the atmospheric electric field every 1-second. Hourly averages of the atmospheric electric field are analyzed for the ship’s leg from 3<sup>rd</sup> to 25<sup>th</sup> March, between Buenos Aires (South America) and Cape Town (South Africa). The median daily curve of the electric field has a shape compatible with the Carnegie curve, but significant variability is found in the daily pattern of individual days, with only about 30% of the days exhibiting a diurnal pattern consistent with the Carnegie curve.</p>

scholarly journals Ozone, hydroperoxides, oxides of nitrogen, and hydrocarbon budgets in the marine boundary layer over the South Atlantic

1996 ◽  
Vol 101 (D19) ◽  
pp. 24221-24234 ◽  
Author(s):  
Brian Heikes ◽  
Meehye Lee ◽  
Daniel Jacob ◽  
Robert Talbot ◽  
John Bradshaw ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
South Atlantic ◽  
Oxides Of Nitrogen ◽  
The South

scholarly journals Hydrogen peroxide in the marine boundary layer over the South Atlantic during the OOMPH cruise in March 2007

2015 ◽  
Vol 15 (12) ◽  
pp. 6971-6980 ◽  
Author(s):  
H. Fischer ◽  
A. Pozzer ◽  
T. Schmitt ◽  
P. Jöckel ◽  
T. Klippel ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Hydrogen Peroxide ◽  
Atmospheric Chemistry ◽  
Marine Boundary Layer ◽  
Austral Summer ◽  
Circulation Model ◽  
South Atlantic ◽  
Strong Increase ◽  
Global Circulation Model ◽  
The South

Abstract. In the OOMPH (Ocean Organics Modifying Particles in both Hemispheres) project a ship measurement cruise took place in the late austral summer from 01 to 23 March 2007. The French research vessel Marion Dufresne sailed from Punta Arenas, Chile (70.85° W, 53.12° S), to Réunion island (55.36° E, 21.06° S) across the South Atlantic Ocean. In situ measurements of hydrogen peroxide, methylhydroperoxide and ozone were performed and are compared to simulations with the atmospheric chemistry global circulation model EMAC (ECHAM/MESSy Atmospheric Chemistry). The model generally reproduces the measured trace gas levels, but it underestimates hydrogen peroxide mixing ratios at high wind speeds, indicating too-strong dry deposition to the ocean surface. An interesting feature during the cruise is a strong increase of hydrogen peroxide, methylhydroperoxide and ozone shortly after midnight off the west coast of Africa due to an increase in the boundary layer height, leading to downward transport from the free troposphere, which is qualitatively reproduced by the model.

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