Simulation of Mixed Layer Depth in the Northeast Pacific Utilizing Spectral Nudging

Donohue, Shawn M.; Stacey, Michael W.

doi:10.1175/2010jpo4499.1

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…They first applied this method to the North Atlantic regional model and approximated the temperature-salinity to the seasonal climatology of observation, which indirectly optimized the simulation results of meso and small scales while suppressing large-scale bias and drifts. Since then, the idea of scale-selective correction has also been extended to the study of continental shelf circulation, mixed layer thickness, mesoscale eddy simulation, and tidal prediction, and its effectiveness has also been proved [14][15][16][17][18].…”

Section: Of 23mentioning

confidence: 99%

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Fu,

He,

Zhao

et al. 2023

JMSE

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Previous studies have pointed out that spectral nudging is still insufficient in improving the long-term simulation ability of numerical models. In response to this problem, this study started with the Luzon Strait and its adjacent areas and discussed the influence of the selection of correction targets on its long-term spectral nudging. We established two sets of numerical experiments with the same parameter configuration except for the correction target: one was the monthly climatological target, and the other was the monthly real-time. The results showed that, compared with the climatology, the real-time target improved the consistency with the observations in large-scale variability on the premise of ensuring the correction of the climatological bias of the model. Further verification of the real-time scheme better simulated the meso- and small-scale characteristics, especially more accurately reproducing the position, intensity, and movement trend of eddies when the Kuroshio intrusion event occurred. Multi-scale energy analysis revealed the significance of adjusting large-scale potential energy to improve the overall simulation ability. The premise is that the correction target needs to fully contain these effective large-scale signals and non-stationary features, and then introduce them into the numerical integration of the regional model through appropriate band-pass filter parameter settings, driving a more reasonable large-scale background state thereby.

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Section: Of 23mentioning

confidence: 99%

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Fu,

He,

Zhao

et al. 2023

JMSE

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Simulated eddy induced vertical velocities in a Gulf of Alaska model

Nudds

Shore

2011

Deep Sea Research Part I: Oceanographic Research Papers

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Simulation of the 2001–02 Anomalous Intrusion in the Northeast Pacific

Donohue

Stacey

2013

Atmosphere-Ocean

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A numerical model, the Parallel Ocean Program (POP) was used to run a 46-year simulation of the North Pacific Ocean beginning in January 1960. The model had a horizontal resolution of 0.25°, 28 vertical levels, and employed spectral nudging that, unlike standard nudging, nudges only specific frequency and wavenumber bands. This simulation was nudged to the mean and monthly Levitus climatology of potential temperature and absolute salinity (S A). The model was forced with the mean monthly winds, sea level pressure, net heat flux, and precipitation from the National Centers for Environmental Prediction (NCEP). The simulation was used to examine the anomalous intrusions, previously observed from 2001 to 2002, of cooler and fresher (less spicy) water flowing southward along the coast of western North America. The simulated anomaly began in 1999 in the North Pacific, progressed southeastward towards the coast and then southward, at least as far south as southern California. The southward velocity signal, modulated by a strong annual cycle, reached Point Conception in 2000 while the temperature and S A anomalies arrived later, in 2002-03. The simulated velocity anomalies were eastward at about 3 cm s −1 in the northeast Pacific near 47°N in agreement with observations. Simulated coastal southward flow speeds reached 10-20 cm s −1 during the summer from 2000 to 2002. This intrusion was by far the largest to occur over the entire length of the simulation. It was also the only time during the simulation when the Victoria mode was positive (associated with enhanced flow to the east via the North Pacific Gyre Oscillation (NPGO)) and the Multivariate El Niño-Southern Oscillation (ENSO) Index (MEI) was negative (La Niña conditions), tending to cause a southward flow anomaly along the coast. RÉSUMÉ [Traduit par la rédaction] Nous avons utilisé un modèle numérique, le Parallel Ocean Program (POP), pour exécuter une simulation sur 46 ans de l'océan Pacifique Nord à partir de janvier 1960. Le modèle avait une résolution horizontale de 0,25°, 28 niveaux verticaux et employait la technique du « poussage spectral » qui, contrairement au poussage ordinaire, ne pousse que certaines bandes de fréquence ou de nombre d'ondes. Cette simulation a été poussée vers la climatologie moyenne et mensuelle de Levitus de la température potentielle et de la salinité absolue (S A). Le modèle a été forcé avec les vents mensuels moyens, la pression au niveau de la mer, le flux de chaleur net et les précipitations des NCEP (National Centers for Environmental Prediction). La simulation a servi à examiner les intrusions anormales, précédemment observées de 2001 à 2002, d'eau plus froide et plus douce (moins épicée) circulant vers le sud le long de la côte ouest de l'Amérique du Nord. L'anomalie simulée a commencé en 1999 dans le Pacifique Nord et a progressé vers le sud-est en direction de la côte puis vers le sud, au moins jusque vis-à-vis le sud de la Californie. Le signal de vitesse vers le sud, modulé par un fort cycle annuel, a atteint Point Concept...

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Simulation of Mixed Layer Depth in the Northeast Pacific Utilizing Spectral Nudging

Cited by 4 publications

References 22 publications

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Simulated eddy induced vertical velocities in a Gulf of Alaska model

Simulation of the 2001–02 Anomalous Intrusion in the Northeast Pacific

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