Journal ArticleDOI
An Automated Approach to Detect Oceanic Eddies From Satellite Remotely Sensed Sea Surface Temperature Data
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TLDR
An automated scheme for eddy detection from remote sensing SST data is presented based on the analysis of velocity fields derived from SST measurements (thermal-wind velocity field), which can identify positions of eddy centers and derive eddy size, intensity, path, and lifetime.Abstract:
Cyclonic (anticyclonic) oceanic eddies drive local upwelling (downwelling), leaving footprints in the sea surface temperature (SST) field as local extremes. Satellite-measured SST images can therefore be used to obtain information of the characteristics of oceanic eddies. Remotely sensed measurements represent very large data sets, both spatially and temporally. Manual eddy detection and analysis are thus practically impossible. In this letter, an automated scheme for eddy detection from remote sensing SST data is presented. The method is based on the analysis of velocity fields derived from SST measurements (thermal-wind velocity field). Using the geometric features of the velocity field, we can identify positions of eddy centers and derive eddy size, intensity, path, and lifetime. The scheme is applied to a realistic remotely sensed SST data set in a strong eddy activity region: Kuroshio Extension region.read more
Citations
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Journal ArticleDOI
Global heat and salt transports by eddy movement
TL;DR: It is shown that eddy transports are mainly due to individual eddy movements, and the estimated meridional heat transport by eddy movement is similar in magnitude and spatial structure to previously published eddy covariance estimates from models.
Journal ArticleDOI
A daily global mesoscale ocean eddy dataset from satellite altimetry
TL;DR: In this paper, the authors present a global daily mesoscale ocean eddy dataset that contains ~45 million features and 3.3 million trajectories that persist at least two days as identified in the AVISO dataset.
Journal ArticleDOI
Southern Ocean eddy phenomenology
TL;DR: In this paper, the authors used satellite observations of sea level anomalies and sea surface temperature (SST) as well as in situ temperature and salinity measurements from profiling floats to identify over a million mesoscale eddy instances and were able to track about 105 of them over 1 month or more.
Journal ArticleDOI
Atmospheric responses to oceanic eddies in the Kuroshio Extension region
TL;DR: In this paper, the authors examined atmospheric responses to 35,000+ oceanic eddies in the Kuroshio Extension region during the period of 2006-2009 using satellite data, and showed that cold (warm) eddies cause surface winds to decelerate (accelerate) and reduce (increase) latent and sensible heat fluxes, cloud liquid water, water vapor content, and rain rate; all of these changes are quantified.
Journal ArticleDOI
An exceptional anticyclonic eddy in the South China Sea in 2010
TL;DR: In this article, an anticyclonic eddy was observed for the first time in the South China Sea (SCS) and the reconstructed three-dimensional temperature and salinity were used to explore the eddy's features and vertical structure.
References
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A Computational Approach to Edge Detection
TL;DR: There is a natural uncertainty principle between detection and localization performance, which are the two main goals, and with this principle a single operator shape is derived which is optimal at any scale.
Journal ArticleDOI
Global observations of nonlinear mesoscale eddies
TL;DR: In this paper, an automated procedure for identifying and tracking mesoscale features based on their SSH signatures yields 35,891 eddies with average lifetime of 32 weeks and an average propagation distance of 550 km.
Journal ArticleDOI
A Vector Geometry–Based Eddy Detection Algorithm and Its Application to a High-Resolution Numerical Model Product and High-Frequency Radar Surface Velocities in the Southern California Bight
TL;DR: In this article, a new algorithm was developed based exclusively on the geometry of the velocity vectors, which is applied to both a high-resolution model product and highfrequency radar surface velocity fields in the Southern California Bight.
Journal ArticleDOI
Eddy-mean flow interaction in the decadally modulating Kuroshio Extension system
Bo Qiu,Shuiming Chen +1 more
TL;DR: In this paper, the authors used satellite altimeter sea-surface height (SSH) data of the past 16 years to investigate the decadal changes of the Kuroshio Extension (KE) system that oscillated between a stable and an unstable dynamic state.
Journal ArticleDOI
Characteristics of Mesoscale Eddies in the Kuroshio-Oyashio Extension Region Detected from the Distribution of the Sea Surface Height Anomaly
Sachihiko Itoh,Ichiro Yasuda +1 more
TL;DR: In this article, the authors investigated the distribution of the sea surface height anomaly (SSHA) with the aim of quantifying the characteristics of mesoscale eddies in the Kuroshio-Oyashio extension region (KOER).