Seasonal dynamics of coastal water masses in a Scottish fjord and their potential influence on benthic foraminiferal shell geochemistry

2008 ◽  
Vol 303 (1) ◽  
pp. 155-172 ◽  
Author(s):  
Alix G. Cage ◽  
William E. N. Austin
Keyword(s):  
Coastal Water ◽  
Seasonal Dynamics ◽  
Water Masses ◽  
Potential Influence ◽  
Shell Geochemistry

scholarly journals Local Coastal Water Masses Control Heat Levels in a West Greenland Tidewater Outlet Glacier Fjord

2018 ◽  
Vol 123 (11) ◽  
pp. 8068-8083 ◽  
Author(s):  
J. Mortensen ◽  
S. Rysgaard ◽  
K. E. Arendt ◽  
T. Juul-Pedersen ◽  
D. H. Søgaard ◽  
...  
Keyword(s):  
Coastal Water ◽  
Water Masses ◽  
Outlet Glacier ◽  
West Greenland

scholarly journals A novel method for tracing coastal water masses using Sr/Ca ratios and salinity in Nanwan Bay, southern Taiwan

2005 ◽  
Vol 65 (1-2) ◽  
pp. 135-142 ◽  
Author(s):  
Chuan-Chou Shen ◽  
Kon-Kee Liu ◽  
Meng-Yang Lee ◽  
Typhoon Lee ◽  
Chung-Ho Wang ◽  
...  
Keyword(s):  
Coastal Water ◽  
Water Masses ◽  
Novel Method ◽  
Southern Taiwan

scholarly journals Bony fish bycatch in the southern Brazil pink shrimp (Farfantepenaeus brasiliensis and F. paulensis) fishery

2005 ◽  
Vol 48 (4) ◽  
pp. 611-623 ◽  
Author(s):  
Marcelo Vianna ◽  
Tabajara Almeida
Keyword(s):  
Seasonal Variation ◽  
Coastal Water ◽  
Critical Period ◽  
Fish Assemblages ◽  
Bony Fish ◽  
Water Masses ◽  
Southern Brazil ◽  
Pink Shrimp ◽  
Bony Fishes ◽  
Homogenous Distribution

Trawling for pink shrimp (Farfantepenaeus brasiliensis and F. paulensis) catches also large quantities of fish, mostly bony fish, which are discarded, as they have no commercial value. Their composition and abundance were studied in an area that corresponded to the southeastern coastline of Brazil. Ninety one species were registered. Incidental fishing affected mainly small individuals and occured throughout the year. The year round rate of bony fish to shrimp catches was 10,5:1,0. Three assemblages of bony fishes could be identified, influenced by the seasonal variation of the water masses, the predominant group being associated with the Coastal Water, another with the penetration of colder waters onto the platform (SACW) and a third group of a more homogenous distribution. The most critical period identified for the bycatch capture was the beginning of the winter, which was due to the overlapping of fish assemblages and the peak of fishing recruitment.

scholarly journals Equatorward Pathways of Solomon Sea Water Masses and Their Modifications

2011 ◽  
Vol 41 (4) ◽  
pp. 810-826 ◽  
Author(s):  
Angélique Melet ◽  
Jacques Verron ◽  
Lionel Gourdeau ◽  
Ariane Koch-Larrouy
Keyword(s):  
Water Column ◽  
Water Mass ◽  
Sea Water ◽  
Southern Oscillation ◽  
Equatorial Pacific ◽  
Water Masses ◽  
Internal Tides ◽  
Tidal Mixing ◽  
Western Boundary ◽  
Potential Influence

Abstract The Solomon Sea is a key region of the southwest Pacific Ocean, connecting the thermocline subtropics to the equator via western boundary currents (WBCs). Modifications to water masses are thought to occur in this region because of the significant mixing induced by internal tides, eddies, and the WBCs. Despite their potential influence on the equatorial Pacific thermocline temperature and salinity and their related impact on the low-frequency modulation of El Niño–Southern Oscillation, modifications to water masses in the Solomon Sea have never been analyzed to our knowledge. A high-resolution model incorporating a tidal mixing parameterization was implemented to depict and analyze water mass modifications and the Solomon Sea pathways to the equator in a Lagrangian quantitative framework. The main routes from the Solomon Sea to the equatorial Pacific occur through the Vitiaz and Solomon straits, in the thermocline and intermediate layers, and mainly originate from the Solomon Sea south inflow and from the Solomon Strait itself. Water mass modifications in the model are characterized by a reduction of the vertical temperature and salinity gradients over the water column: the high salinity of upper thermocline water [Subtropical Mode Water (STMW)] is eroded and exported toward surface and deeper layers, whereas a downward heat transfer occurs over the water column. Consequently, the thermocline water temperature is cooled by 0.15°–0.3°C from the Solomon Sea inflows to the equatorward outflows. This temperature modification could weaken the STMW anomalies advected by the subtropical cell and thereby diminish the potential influence of these anomalies on the tropical climate. The Solomon Sea water mass modifications can be partially explained (≈60%) by strong diapycnal mixing in the Solomon Sea. As for STMW, about a third of this mixing is due to tidal mixing.

Multispecies larval fish associations: Accident or Adaptation?

1983 ◽  
Vol 40 (6) ◽  
pp. 754-762 ◽  
Author(s):  
Kenneth T. Frank ◽  
William C. Leggett
Keyword(s):  
Coastal Water ◽  
Dominant Species ◽  
Water Mass ◽  
Larval Survival ◽  
Water Masses ◽  
Potential Growth ◽  
Safe Sites ◽  
Demersal Eggs ◽  
Frequency Distributions ◽  
Larval Drift

Capelin larvae (Mallotus villosus) time their period of larval drift to coincide with water masses containing abundant food resources and a reduced predator complex by responding to environmental cues associated with coastal water mass replacement. This persistent, coast-wide phenomenon led us to hypothesize that the initiation of larval drift in species of fishes other than capelin, having similar spawning modes, should be linked to the occurrence of these "safe site" water masses. The abundance of larvae of demersal spawning species, other than capelin, in the nearshore waters of our study site in eastern Newfoundland was highly variable during June–August in 1979 and 1980 and was unrelated to seasonal trends. The abundance of this sympatric noncapelin component of the ichthyoplankton was, however, positively related to both water temperature and larval capelin density, both of which are strongly influenced by coastal water mass replacement, and to the occurrence of conditions favorable to larval survival: "safe sites." The noncapelin larval assemblage was dominated by species having demersal eggs (90% of the total catch in two years) spawned in shallow water, in particular, winter flounder (Pseudopleuronectes americanus), radiated shanny (Ulvaria subbifurcata), and seasnails (Liparis spp.). Weekly size frequency distributions of these three species were dominated by newly hatched larvae. We conclude that the onset of larval drift in these species was also synchronized to the temporally variable occurrence of ecological safe sites for larvae. Three advantages accrue: food levels and potential growth rates would be greatly enhanced, predator density would be reduced, and predation rates would be reduced due to association with the dominant species (capelin) that saturate the predator field. Similar associations between a single dominant species and other much less abundant species appear to be common features of the ichthyoplankton of temperate/boreal regions.

scholarly journals Otolith elemental signatures reflect residency in coastal water masses

2010 ◽  
Vol 89 (3-4) ◽  
pp. 341-356 ◽  
Author(s):  
Mary M. Nishimoto ◽  
Libe Washburn ◽  
Robert R. Warner ◽  
Milton S. Love ◽  
Georges L. Paradis
Keyword(s):  
Coastal Water ◽  
Water Masses

scholarly journals Seasonal dynamics of microzooplankton in the São Sebastião Channel (SP, Brazil)

2006 ◽  
Vol 66 (1b) ◽  
pp. 221-231 ◽  
Author(s):  
E. M. Eskinazi-Sant’Anna ◽  
T. K. S. Björnberg
Keyword(s):  
Seasonal Dynamics ◽  
Seasonal Distribution ◽  
Water Masses ◽  
Qualitative Composition ◽  
Numerical Abundance

The qualitative composition, numerical abundance and seasonal distribution of microzooplankton in the São Sebastião Channel were studied in different seasonal periods. Data are presented for 43 Protozoa, 4 rotifer and 30 copepod nauplii specimens. Tintinnids represented the most abundant group within the microzooplankton community, with 31 species recorded, among which Amphorellopsis acuta, Codonellopsis morchella, Eutintinnus tenuis, Favella ehrenbergii, Leprotintinnus nodqvisti, Tintinnopsis buetschlil, T. lobiancoi and T. radix stood out, followed in abundance by copepod nauplii. Our findings indicated that water masses play a fundamental role in the seasonal composition of microzooplankton assemblages in the São Sebastião Channel.

scholarly journals Interannual-to-Multidecadal Responses of Antarctic Ice Shelf–Ocean Interaction and Coastal Water Masses during the Twentieth Century and the Early Twenty-First Century to Dynamic and Thermodynamic Forcing

2020 ◽  
Vol 33 (12) ◽  
pp. 4941-4973
Author(s):  
Kazuya Kusahara
Keyword(s):  
Twentieth Century ◽  
Southern Ocean ◽  
Sea Ice ◽  
Coastal Water ◽  
Water Masses ◽  
First Century ◽  
Ice Shelf ◽  
Early Twenty ◽  
Basal Melting ◽  
The Antarctic

AbstractMuch attention has been paid to ocean–cryosphere interactions over the Southern Ocean. Basal melting of Antarctic ice shelves has been reported to be the primary ablation process for the Antarctic ice sheets. Warm waters on the continental shelf, such as Circumpolar Deep Water (CDW) and Antarctic Surface Water (AASW), play a critical role in active ice shelf basal melting. However, the temporal evolution and mechanisms of the basal melting and warm water intrusions throughout the twentieth century and the early twenty-first century have not been rigorously examined and are not fully understood. Here, we conduct a numerical experiment of an ocean–sea ice–ice shelf model forced with a century-long atmospheric reanalysis for the period 1900–2010. To begin with, we provide an assessment of the atmospheric conditions by comparing with available observation and show biases in warming and stronger westerly trends. Taking into account the limitation, we examine the interannual-to-multidecadal variability in the Antarctic ice shelf basal melting and the role of coastal water masses. A series of numerical experiments demonstrate that wind stress changes over the Southern Ocean drive enhanced poleward heat transport by stronger subpolar gyres and reduce coastal sea ice and cold-water formations, both of which result in an increased ocean heat flux into Antarctic ice shelf cavities. Furthermore, an increase of sea ice–free days leads to enhanced regional AASW contribution to the basal melting. This study demonstrates that changes in Antarctic coastal water masses are key metrics for better understanding of the ocean–cryosphere interaction over the Southern Ocean.

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