18-year variability of ultraviolet radiation penetration in the mid-latitude coastal waters of the western boundary Pacific

2015 ◽  
Vol 160 ◽  
pp. 1-9 ◽  
Author(s):  
Victor S. Kuwahara ◽  
Sena Nozaki ◽  
Junji Nakano ◽  
Tatsuki Toda ◽  
Tomohiko Kikuchi ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Coastal Waters ◽  
Western Boundary

Variability of Bio-optical Factors Influencing the Seasonal Attenuation of Ultraviolet Radiation in Temperate Coastal Waters of Japan¶

2007 ◽  
Vol 72 (2) ◽  
pp. 193-199
Author(s):  
Victor S. Kuwahara ◽  
Hiroshi Ogawa ◽  
Tatsuki Toda ◽  
Tomohiko Kikuchi ◽  
Satoru Taguchi
Keyword(s):  
Ultraviolet Radiation ◽  
Coastal Waters ◽  
Factors Influencing

Acclimation of brown algal photosynthesis to ultraviolet radiation in Arctic coastal waters (Spitsbergen, Norway)

Polar Biology ◽  
1998 ◽  
Vol 20 (6) ◽  
pp. 388-395 ◽  
Author(s):  
Kai Bischof ◽  
Dieter Hanelt ◽  
Helmut Tüg ◽  
Ulf Karsten ◽  
Patty E. M. Brouwer ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Coastal Waters ◽  
Algal Photosynthesis

scholarly journals Shelf Transport Pathways Adjacent to the East Australian Current Reveal Sources of Productivity for Coastal Reefs

2022 ◽  
Vol 8 ◽  
Author(s):  
Moninya Roughan ◽  
Paulina Cetina-Heredia ◽  
Nina Ribbat ◽  
Iain M. Suthers
Keyword(s):  
Coastal Waters ◽  
Western Boundary ◽  
Mesoscale Circulation ◽  
East Australian Current ◽  
Separation Region ◽  
Inner Shelf ◽  
Transport Pathways ◽  
Rocky Reefs ◽  
Productivity Potential ◽  
The Impact

The region where the East Australian Current (EAC) separates from the coast is dynamic and the shelf circulation is impacted by the interplay of the western boundary current and its eddy field with the coastal ocean. This interaction can drive upwelling, retention or export. Hence understanding the connection between offshore waters and the inner shelf is needed as it influences the productivity potential of valuable coastal rocky reefs. Near urban centres, artificial reefs enhance fishing opportunities in coastal waters, however these reefs are located without consideration of the productivity potential of adjacent waters. Here we identify three dominant modes of mesoscale circulation in the EAC separation region (~31.5−34.5°S); the ‘EAC mode’ which dominates the flow in the poleward direction, and two eddy modes, the ‘EAC eddy mode’ and the ‘Eddy dipole mode’, which are determined by the configuration of a cyclonic and anticyclonic eddy and the relationship with the separated EAC jet. We use a Lagrangian approach to reveal the transport pathways across the shelf to understand the impact of the mesoscale circulation modes and to explore the productivity potential of the coastal waters. We investigate the origin (position and depth) of the water that arrives at the inner-mid shelf over a 21-day period (the plankton productivity timescale). We show that the proportion of water that is upwelled from below the euphotic zone varies spatially, and with each mesoscale circulation mode. Additionally, shelf transport timescales and pathways are also impacted by the mesoscale circulation. The highest proportion of upwelling (70%) occurs upstream of 32.5°S, associated with the EAC jet separation, with vertical displacements of 70–120 m. From 33 to 33.5°S, water comes from offshore above the euphotic layer, and shelf transport timescales are longest. The region of highest retention over the inner shelf is immediately downstream of the EAC separation region. The position of the EAC jet and the location of the cyclonic eddy determines the variability in shelf-ocean interactions and the productivity of shelf waters. These results are useful for understanding productivity of temperate rocky reefs in general and specifically for fisheries enhancements along an increasingly urbanised coast.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

803: Interactions Between Ultraviolet Radiation and Polymorphisms in the Vitamin D Receptor Gene Mediate Prostate Cancer Susceptibility

2006 ◽  
Vol 175 (4S) ◽  
pp. 260-260
Author(s):  
Nicholas J. Rukin ◽  
Samuel J. Moon ◽  
Dhaval Bodiwala ◽  
Christopher J. Luscombe ◽  
Mark F. Saxby ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Vitamin D ◽  
Ultraviolet Radiation ◽  
Vitamin D Receptor ◽  
Cancer Susceptibility ◽  
Receptor Gene ◽  
Vitamin D Receptor Gene ◽  
Prostate Cancer Susceptibility
Sign in / Sign up

Export Citation Format

Share Document