Aerosol size distributions in the cloudy atmospheric boundary layer of the North Atlantic Ocean

1993 ◽  
Vol 98 (D5) ◽  
pp. 8841-8846 ◽  
Author(s):  
Dean A. Hegg ◽  
Ronald J. Ferek ◽  
Peter V. Hobbs
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
Atmospheric Boundary Layer ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Size Distributions ◽  
The North ◽  
The North Atlantic

Simulation of mid-latitude winter storms over the North Atlantic Ocean: impact of boundary layer parameterization schemes

2019 ◽  
Vol 53 (11) ◽  
pp. 6785-6814 ◽  
Author(s):  
P. K. Pradhan ◽  
Margarida L. R. Liberato ◽  
Vinay Kumar ◽  
S. Vijaya Bhaskara Rao ◽  
Juan Ferreira ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Winter Storms ◽  
Parameterization Schemes ◽  
The North ◽  
The North Atlantic

scholarly journals Automated Processing of Oceanic Bubble Images for Measuring Bubble Size Distributions underneath Breaking Waves

2016 ◽  
Vol 33 (8) ◽  
pp. 1701-1714 ◽  
Author(s):  
Raied S. Al-Lashi ◽  
Steve R. Gunn ◽  
Helen Czerski
Keyword(s):  
High Resolution ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
Bubble Size ◽  
North Atlantic Ocean ◽  
Breaking Waves ◽  
Size Distributions ◽  
The North ◽  
Automated Processing ◽  
The North Atlantic

AbstractAccurate in situ measurements of oceanic bubble size distributions beneath breaking waves are needed for a better understanding of air–sea gas transfer and aerosol production processes. To achieve this goal, a novel high-resolution optical instrument for imaging oceanic bubbles was designed and built in 2013 for the High Wind Gas Exchange Study (HiWinGS) campaign in the North Atlantic Ocean. The instrument is able to operate autonomously and can continuously capture high-resolution images at 15 frames per second over an 8-h deployment. The large number of images means that it is essential to use an automated processing algorithm to process these images. This paper describes an automated algorithm for processing oceanic images based on a robust feature extraction technique. The main advantages of this robust algorithm are it is significantly less sensitive to the noise and insusceptible to the background changes in illumination, can extract circular bubbles as small as one pixel (approximately 20 μm) in radius accurately, has low computing time (approximately 5 seconds per image), and is simple to implement. The algorithm was successfully used to analyze a large number of images (850 000 images) from deployment in the North Atlantic Ocean as part of the HiWinGS campaign in 2013.

scholarly journals The Impact of a Bottom Boundary Layer Scheme on the North Atlantic Ocean in a Global Coupled Climate Model

2005 ◽  
Vol 35 (2) ◽  
pp. 202-217 ◽  
Author(s):  
Yong Ming Tang ◽  
Malcolm J. Roberts
Keyword(s):  
Boundary Layer ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
General Circulation ◽  
North Atlantic Ocean ◽  
Bottom Boundary Layer ◽  
Bottom Boundary ◽  
The North ◽  
Boundary Layer Scheme ◽  
The North Atlantic

Abstract Although the overflow and descent of cold, dense water across the Greenland–Iceland–Scotland ridge is the principal means for the maintenance of the thermohaline circulation in the North Atlantic Ocean, this feature is not adequately treated in global ocean numerical models. In this paper, a bottom boundary layer scheme is introduced into the HadCM3 coupled atmosphere–ocean–sea ice general circulation climate model, in order to give an improved representation of cold water formation in the North Atlantic Ocean. The scheme uses a simple terrain-following bottom boundary layer incorporated into the ocean general circulation model; only the tracer tendencies are evaluated in the bottom boundary layer, with the velocities taken from the near-bottom interior values. It is found that with the bottom boundary layer scheme, there are several significant effects on the deep water formation and flow. The overflow of dense water from the Nordic Seas into the North Atlantic Seas is improved with the introduction of the authors’ bottom boundary layer scheme. Further, the thermohaline circulation is reduced in strength, but is also deeper, when compared with simulations without any bottom boundary layer scheme. There is also a stronger flow along the northwestern boundary, a more southerly location of the North Atlantic Current, and a stronger and larger subpolar gyre. Overall, these effects are an improvement when compared with climatology, although some differences remain.

Spatiotemporal evolution of the chlorophyll a trend in the North Atlantic Ocean

2018 ◽  
Vol 612 ◽  
pp. 1141-1148 ◽  
Author(s):  
Min Zhang ◽  
Yuanling Zhang ◽  
Qi Shu ◽  
Chang Zhao ◽  
Gang Wang ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Chlorophyll A ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Spatiotemporal Evolution ◽  
The North ◽  
The North Atlantic
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