Mesoscale eddy aswirl with data in Gulf of Alaska

Crawford, William R.; Whitney, Frank A.

doi:10.1029/eo080i033p00365-01

Cited by 57 publications

(15 citation statements)

References 4 publications

(4 reference statements)

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“…The MODAS analyses from 1998 confirm the presence of numerous eddies that are seen in the model results. On the basis of the same altimeter data, the intense mesoscale activity in the GoA during 1998 has previously been reported by Crawford and Whitney [1999].…”

Section: Summary and Concluding Remarkssupporting

confidence: 69%

“… Matthews et al [1992] found large eddies similar to those inferred from in situ observations using data from the Geosat geodetic mission. Data from more recent altimeters have proven that the large anticyclonic eddies in the GoA may remain intact for a period well beyond 1 year [ Crawford and Whitney , 1999; Okkonen et al , 2001]. These eddies can also be observed in infrared radiometer images from satellites [ Thomson and Gower , 1998], but winter conditions in the GoA generally present few cloud‐free days.…”

Section: Introductionmentioning

confidence: 99%

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Impact of remote oceanic forcing on Gulf of Alaska sea levels and mesoscale circulation

2003

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.[1] We examine the relative importance of regional wind forcing and teleconnections by an oceanic pathway for impact on interannual ocean circulation variability in the Gulf of Alaska. Any additional factors that contribute to this variability, such as freshwater forcing from river runoff, are disregarded. The study is based on results from numerical simulations, sea level data from tide gauge stations, and sea surface height anomalies from satellite altimeter data. At the heart of this investigation is a comparison of ocean simulations that include and exclude interannual oceanic teleconnections of an equatorial origin. Using lagged correlations, the model results imply that 70-90% of the interannual coastal sea level variance in the Gulf of Alaska can be related to interannual sea levels at La Libertad, Equador. These values are higher than the corresponding range from sea level data, which is 25-55%. When oceanic teleconnections from the equatorial Pacific are excluded in the model, the explained variance becomes about 20% or less. During poleward propagation the coastally trapped sea level signal in the model is less attenuated than the observed signal. In the Gulf of Alaska we find well-defined sea level peaks in the aftermath of El Niño events. The interannual intensity of eddies in the Gulf of Alaska also peaks after El Niño events; however, these maxima are less clear after weak and moderate El Niño events. The interannual variations in eddy activity intensity are predominantly governed by the regional atmospheric forcing.

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Section: Summary and Concluding Remarkssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Impact of remote oceanic forcing on Gulf of Alaska sea levels and mesoscale circulation

2003

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“…The eddy detection methods are mainly categorized into three types: (1) methods based on eddy inherit parameters, such as the Okubo-Weiss (OW) method; (2) eddy geometry-based methods, including the eddy-induced sea level anomaly (SLA)-based method; and (3) hybrid methods, which use both physical parameters and flow pattern associated with eddies. The eddy tracking methods have attracted a great deal of attention to understand different scientific problems [10][11][12][13][14][15][16]. The first school of tracking methods is referred to as the similarity method.…”

Section: Introductionmentioning

confidence: 99%

An Improved Automatic Algorithm for Global Eddy Tracking Using Satellite Altimeter Data

et al. 2017

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Abstract:In this paper, we propose a new hybrid mesoscale eddy tracking method to enhance the eddy tracking accuracy from global satellite altimeter data. This method integrates both physical and geometric eddy properties (including the distance between eddies, the area and amplitude of eddy, and the shape of the eddy edge) via the output of detection and the calculation of Hausdorff distance, which could describe the similarity between eddy boundaries. We applied the proposed hybrid method to several previously reported eddies and compared the results with those from two traditional tracking methods. A quantitative comparison indicates that the hybrid algorithm can better reveal eddy signals in terms of their spatial scale, amplitude, lifespan, and splitting. The hybrid method was used for global mesoscale eddies tracking from 1993 to 2015. Global distributions of net eddy numbers revealed that the sources of eddies are located along the eastern boundaries of the world oceans, while the sinks of eddies are located along the western boundaries. The lifespan distribution of eddies exhibited steep growth from high and low latitudes to middle latitudes. A clear divergent pathway demonstrates that cyclonic/anticyclonic eddies tend to travel poleward/equatorward in the world oceans.

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“…, are predominantly anticyclonic, and are more commonly observed in spring (Crawford & Whitney, 1999). Modeling studies have suggested that such eddies near the shelf break are intensified by ENSO warm events (Melsom, Meyers, Hurlburt, Metzger, & O'Brien, 1999).…”

mentioning

confidence: 99%