Radon: A Geochemical and Geophysical Tracer in Marine System

2016 ◽  
pp. 119-144 ◽  
Author(s):  
Mark Baskaran
Keyword(s):  
Marine System

Shifts in cell size and community composition of bacterioplankton due to grazing by heterotrophic flagellates: evidence from a marine system

2019 ◽  
Vol 83 (3) ◽  
pp. 295-308
Author(s):  
MG Weinbauer ◽  
S Suominen ◽  
J Jezbera ◽  
ME Kerros ◽  
S Marro ◽  
...  
Keyword(s):  
Cell Size ◽  
Community Composition ◽  
Heterotrophic Flagellates ◽  
Marine System

Mean Sea Level as a Reference for Geodetic Leveling

1974 ◽  
Vol 28 (5) ◽  
pp. 524-530 ◽  
Author(s):  
G. W. Lennon
Keyword(s):  
Sea Level ◽  
World Ocean ◽  
Equipotential Surface ◽  
Scientific Discipline ◽  
Mean Sea Level ◽  
Sea Levels ◽  
Coastal Sea ◽  
Long Time ◽  
Marine System

The use of mean sea level as a surface of reference that might provide an independent control for geodetic leveling has been a long term goal arising from the classical analogy between the geoid as an equipotential surface and the surface assumed by a hypothetical undisturbed world ocean. The problems associated with this aim are now known to be vast, and are associated with the dynamics of the marine system, notably its response to meteorological forces, to variations in density and to the effects of basic circulation patterns. In consequence the mean sea level surface varies rapidly in both time and space. This identifies in fact a distinctive scientific discipline, coastal geodesy, in which contributions are required by both geodesists and oceanographers. It has come to be recognized that the coastal zone is a hazardous environment for all observational techniques concerned. On the one hand, the difficulties of measurement of coastal sea levels have only recently been understood; on the other hand, precise leveling procedures are now known to be influenced by the attraction of marine tides and by crustal deformation of tidal loading. Much of the data available for study are therefore inadequate and, moreover, it should be noted that long-time series are required. It is now possible to lay plans for both geodetic and oceanographic procedures to remedy these deficiencies in the long-term interests of the study.

scholarly journals Dissolved Methane Distribution in the Reloncaví Fjord and Adjacent Marine System During Austral Winter (41°–43° S)

2017 ◽  
Vol 40 (6) ◽  
pp. 1592-1606 ◽  
Author(s):  
Laura Farías ◽  
Karen Sanzana ◽  
Sandra Sanhueza-Guevara ◽  
Mariela A. Yevenes
Keyword(s):  
Austral Winter ◽  
Dissolved Methane ◽  
Marine System ◽  
Methane Distribution

scholarly journals First report of vampyrellid predator–prey dynamics in a marine system

2018 ◽  
Vol 13 (4) ◽  
pp. 1110-1113 ◽  
Author(s):  
Catharina Alves-de-Souza ◽  
Tatiane S. Benevides ◽  
Mariângela Menezes ◽  
Christian Jeanthon ◽  
Laure Guillou
Keyword(s):  
Predator Prey ◽  
First Report ◽  
Marine System

scholarly journals Prediction of Student Performance in Academic and Military Learning Environment: Use of Multiple Linear Regression Predictive Model and Hypothesis Testing

2017 ◽  
Vol 6 (4) ◽  
pp. 152 ◽  
Author(s):  
Wasi Z. Khan ◽  
Sarim Al Zubaidy
Keyword(s):  
Student Performance ◽  
Undergraduate Students ◽  
Physical Training ◽  
Multiple Regression Model ◽  
Academic Risk ◽  
Learning Capability ◽  
Specific Discipline ◽  
Marine System ◽  
Course Load ◽  
Military College

The variance in students’ academic performance in a civilian institute and in a military technological institute could be linked to the environment of the competition available to the students. The magnitude of talent, domain of skills and volume of efforts students put are identical in both type of institutes. The significant factor is the physical training, students undergo in a military college. It is important to couple the dominating factor which is academic perceivable effort under a different environment with each students learning capability. This paper determine whether there is a relationship between students’ performance and influencing factors like academic aptitude, military or physical training, and the time spent on training need analysis (TNA) modules. A sample of 242 first year- undergraduate students from four different engineering programs (Marine, System, Civil, and Aeronautical) at Military College was used to explore this relationship. The multiple regression model used for predicting the students’ performance is adequate for independent variables of aptitude test score, time spent in physical training, and time spent in TNA modules. The values of R2 indicate that at least one of the predictor variables contributes to information for the prediction of the students’ performance. The model makes it possible to predict moderately the possibility of attrition in engineering program. This study verifies that military academy has a very defined and directed core engineering course load and TNA course load which every student must take. Therefore, choice of specific discipline have less impact than at civilian institutions. The early detection of students at academic risk is a useful instrument that can help to design mentoring strategies right from the end of admission process. 

scholarly journals Processes determining the marine alkalinity and calcium carbonate saturation state distributions

2014 ◽  
Vol 11 (24) ◽  
pp. 7349-7362 ◽  
Author(s):  
B. R. Carter ◽  
J. R. Toggweiler ◽  
R. M. Key ◽  
J. L. Sarmiento
Keyword(s):  
Calcium Carbonate ◽  
The Arctic ◽  
Effect Of Temperature ◽  
Minor Role ◽  
Co2 Solubility ◽  
Saturation State ◽  
Marine System ◽  
Calcite Saturation ◽  
River Mouths ◽  
Arctic Surface

Abstract. We introduce a composite tracer for the marine system, Alk*, that has a global distribution primarily determined by CaCO3 precipitation and dissolution. Alk* is also affected by riverine alkalinity from dissolved terrestrial carbonate minerals. We estimate that the Arctic receives approximately twice the riverine alkalinity per unit area as the Atlantic, and 8 times that of the other oceans. Riverine inputs broadly elevate Alk* in the Arctic surface and particularly near river mouths. Strong net carbonate precipitation results in low Alk* in subtropical gyres, especially in the Indian and Atlantic oceans. Upwelling of dissolved CaCO3-rich deep water elevates North Pacific and Southern Ocean Alk*. We use the Alk* distribution to estimate the variability of the calcite saturation state resulting from CaCO3 cycling and other processes. We show that regional differences in surface calcite saturation state are due primarily to the effect of temperature differences on CO2 solubility and, to a lesser extent, differences in freshwater content and air–sea disequilibria. The variations in net calcium carbonate cycling revealed by Alk* play a comparatively minor role in determining the calcium carbonate saturation state.

scholarly journals Spatiotemporal Signals and Palaeoenvironments of Endemic Molluscan Assemblages in the Marine System of the Sarmatian Paratethys

2011 ◽  
Vol 56 (4) ◽  
pp. 767-784 ◽  
Author(s):  
Susanne Lukeneder ◽  
Martin Zuschin ◽  
Mathias Harzhauser ◽  
Oleg Mandic
Keyword(s):  
Marine System
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