Surface currents imaged with hybrid along and cross track interferometry

2002 ◽  
Author(s):  
R. Siegmund ◽  
Mingquan Bao ◽  
S. Lehner ◽  
A. Niedermeier ◽  
R. Mayerle
Keyword(s):  
Surface Currents ◽  
Cross Track

scholarly journals Honing in on bioluminescent milky seas from space

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Steven D. Miller ◽  
Steven H. D. Haddock ◽  
William C. Straka ◽  
Curtis J. Seaman ◽  
Cynthia L. Combs ◽  
...  
Keyword(s):  
Scientific Inquiry ◽  
Water Mass ◽  
Marine Ecosystem ◽  
Sea Surface ◽  
Surface Currents ◽  
Maritime Continent ◽  
Low Light ◽  
Composition Formation ◽  
Mass Isolation ◽  
New Generation

AbstractMilky seas are a rare form of marine bioluminescence where the nocturnal ocean surface produces a widespread, uniform and steady whitish glow. Mariners have compared their appearance to a daylit snowfield that extends to all horizons. Encountered most often in remote waters of the northwest Indian Ocean and the Maritime Continent, milky seas have eluded rigorous scientific inquiry, and thus little is known about their composition, formation mechanism, and role within the marine ecosystem. The Day/Night Band (DNB), a new-generation spaceborne low-light imager, holds potential to detect milky seas, but the capability has yet to be demonstrated. Here, we show initial examples of DNB-detected milky seas based on a multi-year (2012–2021) search. The massive bodies of glowing ocean, sometimes exceeding 100,000 km2 in size, persist for days to weeks, drift within doldrums amidst the prevailing sea surface currents, and align with narrow ranges of sea surface temperature and biomass in a way that suggests water mass isolation. These findings show how spaceborne assets can now help guide research vessels toward active milky seas to learn more about them.

Comment on “Stepped pressure profile equilibria in cylindrical plasmas via partial Taylor relaxation” [J. Plasma Physics (2006), vol. 72, part 6, pp. 1167–1171]

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Yuanfan Wang ◽  
Dhairya Malhotra ◽  
Antoine J. Cerfon
Keyword(s):  
Plasma Physics ◽  
Pressure Profile ◽  
Surface Currents ◽  
Magnetohydrodynamic Model ◽  
Taylor Relaxation

In an early study of the properties and capabilities of the multiregion, relaxed magnetohydrodynamic model, Hole, Hudson & Dewar claim that they are able to construct a multiregion stepped pressure cylindrical equilibrium which does not require the existence of surface currents. We present a brief argument showing that this claim is incorrect, and clarify the meaning of their statement. Furthermore, even with the statement clarified, we demonstrate that it is not possible to find solutions to reproduce the equilibrium corresponding to the parameters given in the article. We invite the authors to provide a corrigendum with the correct values of the equilibrium they constructed.

scholarly journals Potential changes in the connectivity of marine protected areas driven by extreme ocean warming

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Luciana Shigihara Lima ◽  
Douglas Francisco Marcolino Gherardi ◽  
Luciano Ponzi Pezzi ◽  
Leilane Gonçalves dos Passos ◽  
Clarissa Akemi Kajiya Endo ◽  
...  
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Oceanic Islands ◽  
Ocean Warming ◽  
Surface Currents ◽  
Southwest Atlantic ◽  
Tropical Ocean ◽  
Regional Effects ◽  
Rcp 8.5

AbstractProjected future climate scenarios anticipate a warmer tropical ocean and changes in surface currents that will likely influence the survival of marine organisms and the connectivity of marine protected areas (MPAs) networks. We simulated the regional effects of climate change on the demographic connectivity of parrotfishes in nine MPAs in the South Atlantic through downscaling of the HadGEM2-ES Earth System Model running the RCP 8.5 greenhouse gas trajectory. Results indicate a tropicalization scenario over the tropical southwest Atlantic following an increase of sea surface temperature (SST) between 1.8 and 4.5 °C and changes in mean surface currents between − 0.6 to 0.5 m s−1 relative to present conditions. High mortality rates will reduce demographic connectivity and increase the isolation of oceanic islands. The simulation of organismal response to ocean warming shows that acclimation can significantly improve (p < 0.001) particle survival, promoting connectivity and tropicalization of MPAs, with potential impacts on their functional integrity and long-term resilience.

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