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Exceptional mixing events in meromictic Lake Lugano (Switzerland/Italy), studied using environmental tracers
Exceptional mixing events Lake Lugano
2014/4/18
The deep northern basin of Lake Lugano was permanently stratified over the last 4 decades because of
mineralization in response to strong eutrophication. However, two consecutive cold and windy winte...
The Horizontal Diffusion of Tracers by Surface Waves
Horizontal Diffusion Tracers Surface Waves
2009/2/7
The horizontal dispersion of tracers in the presence of a random field of ocean surface waves is examined. Random fluctuations in the local Stokes-drift current cause a water particle to follow a rand...
The Roles of Langmuir Circulations in the Dispersion of Surface Tracers
Langmuir Circulations Dispersion of Surface Tracers
2009/1/6
A hierarchy of theoretical and numerical models for the dispersion of discrete floating tracers on lakes and oceans is presented. Central to these models is the role of Langmuir circulations, which co...
Determining Velocities and Mixing Coefficients from Tracers
oceanic velocities smooth flows Tracers
2008/12/30
The effort to determine oceanic velocities from tracer distributions relies on a knowledge of the effects of mixing. However, the macroscopic diffusion coefficient, K, is generally not known and must ...
Eddy Resolution versus Eddy Diffusion in a Double Gyre GCM. Part II：Mixing of Passive Tracers
Eddy Resolution Double Gyre GCM Eddy Diffusion Passive Tracers
2008/12/15
The parameterization of the effect of the unresolved scales of motion on a passive tracer field in large-scale numerical ocean models is analyzed through a combination of Lagrangian and Eulerian veloc...
The dispersion of a tracer by a two-dimensional gyre circulation is studied using simple numerical models. Two approaches are taken: a random walk model formulated in a streamline coordinate system an...
Tracers and Potential Vorticities in Ocean Dynamics
Tracers Potential Vorticities Ocean Dynamics
2008/6/25
The Ertel potential vorticity theorem for stratified viscous fluids in a rotating system is analyzed herein. A set of “tracers,” that is, materially conserved scalar quantities, and the corresponding ...
Lagrangian Motion of Particles and Tracers on Isopycnals
Lagrangian Motion Particles Tracers Isopycnals
2008/6/11
This study looks at the behavior of fluid particles/parcels that move along isopycnic surfaces. The aim is to show that the diffusive process of mixing by eddies causes such particles to move toward r...
Use of Passive Tracers as a Diagnostic Tool in Coupled Model Simulations—Northern Hemisphere
Passive Tracers Diagnostic Tool Northern Hemisphere
2008/6/4
This study focuses on the uptake of a passive idealized tracer in the Northern Hemisphere oceans from two coupled ocean–atmosphere simulations: a standard horizontal diffusion case and the second case...
Short-lived radionuclides (7 Be and 210 Pb) as tracers of particle dynamics in a river system in southeast Michigan
Short-lived radionuclides particle dynamics
2014/4/21
Riverine water samples (dissolved and particulate), surficial bottom sediments, and trapped sediments were
collected mostly monthly from three stations along the Clinton River, in southeastern Michig...
Rapid deep-water renewal in Lake Issyk-Kul (Kyrgyzstan) indicated by transient tracers
deep-water renewal Lake Issyk-Kul transient tracers
2014/5/27
Simultaneous profiles of the transient tracers sulfur hexafluoride (SF6), 3H-3He, and the chlorofluorocarbons CFC-11 and CFC-12 were measured in Lake Issyk-Kul, a large, deep lake in Kyrgyzstan. Appar...
The use of photolytic rhodamines WT and sulpho G as conservative tracers of dispersion in surface waters
photolytic rhodamine WT sulphur Gas conservative tracers dispersion in surface waters
2014/6/9
We describe the use of sulpho rhodamine G (SG) and rhodamine WT (WT) as oceanographic tracers in tidally active waters of the southeastern North Sea. Ten kilograms of SG and 5 kg of WT dissolved in 1,...