scholarly journals Tidally driven residual circulation in shallow estuaries with lateral depth variation

1997 ◽  
Vol 102 (C13) ◽  
pp. 27915-27929 ◽  
Author(s):  
Chunyan Li ◽  
James O'Donnell
Keyword(s):  
Residual Circulation ◽  
Depth Variation ◽  
Tidally Driven ◽  
Shallow Estuaries

Variations of tidally driven three-layer residual circulation in fjords

2014 ◽  
Vol 64 (3) ◽  
pp. 459-469 ◽  
Author(s):  
Arnoldo Valle-Levinson ◽  
Mario A. Caceres ◽  
Oscar Pizarro
Keyword(s):  
Residual Circulation ◽  
Tidally Driven

The role of tides, river discharge and wind on the residual circulation of Maputo Bay

2020 ◽  
pp. 101604
Author(s):  
Paulo J. Sigaúque ◽  
Carlos A.F. Schettini ◽  
Samuel S. Valentim ◽  
Eduardo Siegle
Keyword(s):  
River Discharge ◽  
Residual Circulation

scholarly journals A multi-variable box model approach to the soft tissue carbon pump

2010 ◽  
Vol 6 (6) ◽  
pp. 827-841 ◽  
Author(s):  
A. M. de Boer ◽  
A. J. Watson ◽  
N. R. Edwards ◽  
K. I. C. Oliver
Keyword(s):  
Soft Tissue ◽  
Numerical Models ◽  
Nutrient Utilization ◽  
Atmospheric Co2 ◽  
Box Model ◽  
Co2 Uptake ◽  
Residual Circulation ◽  
Biological Mechanisms ◽  
Export Production ◽  
Model Approach

Abstract. The canonical question of which physical, chemical or biological mechanisms were responsible for oceanic uptake of atmospheric CO2 during the last glacial is yet unanswered. Insight from paleo-proxies has led to a multitude of hypotheses but none so far have been convincingly supported in three dimensional numerical modelling experiments. The processes that influence the CO2 uptake and export production are inter-related and too complex to solve conceptually while complex numerical models are time consuming and expensive to run which severely limits the combinations of mechanisms that can be explored. Instead, an intermediate inverse box model approach of the soft tissue pump is used here in which the whole parameter space is explored. The glacial circulation and biological production states are derived from these using proxies of glacial export production and the need to draw down CO2 into the ocean. We find that circulation patterns which explain glacial observations include reduced Antarctic Bottom Water formation and high latitude upwelling and mixing of deep water and to a lesser extent reduced equatorial upwelling. The proposed mechanism of CO2 uptake by an increase of eddies in the Southern Ocean, leading to a reduced residual circulation, is not supported. Regarding biological mechanisms, an increase in the nutrient utilization in either the equatorial regions or the northern polar latitudes can reduce atmospheric CO2 and satisfy proxies of glacial export production. Consistent with previous studies, CO2 is drawn down more easily through increased productivity in the Antarctic region than the sub-Antarctic, but that violates observations of lower export production there. The glacial states are more sensitive to changes in the circulation and less sensitive to changes in nutrient utilization rates than the interglacial states.

Channel head dynamics: capelin (Mallotus villosus) aggregation in the tidally driven upwelling system of the Saguenay - St. Lawrence Marine Park's whale feeding ground

2002 ◽  
Vol 59 (2) ◽  
pp. 197-210 ◽  
Author(s):  
Yvan Simard ◽  
Diane Lavoie ◽  
François J Saucier
Keyword(s):  
Circulation Model ◽  
Feeding Strategies ◽  
Total Biomass ◽  
Balaenoptera Acutorostrata ◽  
Mallotus Villosus ◽  
Tidal Dynamics ◽  
Lawrence Estuary ◽  
Fin Whale ◽  
Capelin Mallotus Villosus ◽  
Tidally Driven

Capelin (Mallotus villosus) tridimensional distribution at the head of the Laurentian Channel in the St. Lawrence estuary was investigated using 38- and 120-kHz acoustic surveys in the summers of 1994, 1995, 1997, and 1998. The results are interpreted with the help of a high-resolution tridimensional tidal circulation model. Total biomasses were small (93–4583 t) and showed rapid fluctuations, whereas mesoscale distribution was more constant. Capelin tended to occupy the very end of the channel head, especially the slopes and shallows surrounding the basins. This pattern did not coincide with the krill distribution, but the two total biomass series were significantly correlated. Capelin tidal dynamics is characterized by herding of capelin against the channel head slopes by the starting flooding currents, followed by an upwelling over the sills and shallows during maximum flood currents, and a return to the channel by the surface outflow during ebb. Each side of the channel head has a distinct capelin retention tidal cycle involving passive advection, swimming, and the two-layer estuarine circulation. This capelin distribution and tidal dynamics closely match the local fin whale (Balaenoptera physalus) and minke whale (Balaenoptera acutorostrata) distributions observed from the whale-watching fleet and typical tidal feeding strategies at the channel head.

Characteristics of atmospheric aerosol optical depth variation over China in recent 30 years

2000 ◽  
Vol 45 (14) ◽  
pp. 1328-1334 ◽  
Author(s):  
Yunfeng Luo ◽  
Daren Lü ◽  
Qing He ◽  
Weiliang Li ◽  
Xiuji Zhou
Keyword(s):  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Atmospheric Aerosol ◽  
Depth Variation

scholarly journals Residual Circulation in the Stratosphere and Lower Mesosphere as Diagnosed from Microwave Limb Sounder Data

1996 ◽  
Vol 53 (2) ◽  
pp. 217-240 ◽  
Author(s):  
Janusz Eluszkiewicz ◽  
David Crisp ◽  
Richard Zurek ◽  
Lee Elson ◽  
Evan Fishbein ◽  
...  
Keyword(s):  
Residual Circulation
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