Study of the Kuroshio/Ryukyu Current system based on satellite-altimeter and in situ measurements

2008 ◽  
Vol 64 (6) ◽  
pp. 937-950 ◽  
Author(s):  
Magdalena Andres ◽  
Jae-Hun Park ◽  
Mark Wimbush ◽  
Xiao-Hua Zhu ◽  
Kyung-Il Chang ◽  
...  
Ocean Science ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 453-463 ◽  
Author(s):  
Sergey V. Prants ◽  
Maxim V. Budyansky ◽  
Michael Y. Uleysky

Abstract. A Lagrangian methodology is developed to simulate, track, document and analyze the origin and history of water masses in ocean mesoscale features. It aims to distinguish whether water masses inside the mesoscale eddies originated from the main currents in the Kuroshio–Oyashio confluence zone. By computing trajectories for a large number of synthetic Lagrangian particles advected by the AVISO velocity field after the Fukushima accident, we identify and track the mesoscale eddies which were sampled in the cruises in 2011 and 2012 and estimate their risk of being contaminated by Fukushima-derived radionuclides. The simulated results are compared with in situ measurements, showing a good qualitative correspondence.


2017 ◽  
Author(s):  
Sergey V. Prants ◽  
Maxim V. Budyansky ◽  
Michael Yu. Uleysky

Abstract. A Lagrangian methodology is elaborated to simulate, track, document and analyze origin and history of water masses in ocean mesoscale features. It is aimed to distinguish water masses inside the mesoscale eddies originated from the main currents in the Kuroshio–Oyashio confluence zone. Computing trajectories for a large number of synthetic tracers advected by the AVISO velocity field after the Fukushima accident, we identify and track the mesoscale eddies which have been sampled in the cruises in 2011 and 2012 and estimate their risk to be contaminated by Fukushima-derived radionuclides. The simulated results are compared with in situ measurements to be in a good qualitative correspondence.


2003 ◽  
Vol 59 (6) ◽  
pp. 751-763 ◽  
Author(s):  
Konstantin V. Lebedev ◽  
Max Yaremchuk ◽  
Humio Mitsudera ◽  
Iwao Nakano ◽  
Gang Yuan

2019 ◽  
Author(s):  
Michael Stukel ◽  
Thomas Kelly

Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon:thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U-234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking.


2013 ◽  
Vol 24 (3) ◽  
pp. 147
Author(s):  
Ming LI ◽  
Qinghua YANG ◽  
Jiechen ZHAO ◽  
Lin ZHANG ◽  
Chunhua LI ◽  
...  

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