Evaluation of a Coupled Modeling Approach for the Investigation of the Effects of SST Mesoscale Variability on the Atmosphere

Szunyogh, Istvan; Forinash, Eric; Gyarmati, Gyorgyi; Jia, Yunfeng; Chang, Ping; Saravanan, R.

doi:10.1029/2020ms002412

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…The variability of the North Pacific jet exerts crucial influences on weather and climate of North America associated with the Pacific–North American pattern, synoptic features and the structure and evolution of the large‐scale circulation (Griffin & Martin, 2017; Jaffe et al., 2011; Otkin & Martin, 2004; Yu et al., 2021). Previous studies have shown that by enhancing the simulation capabilities of ocean eddies in numerical models, the forecast of extratropical cyclones and storm systems over the North Pacific in winter can be improved (Ma, Chang et al., 2015; Ma et al., 2017; Szunyogh et al., 2021), but the specific mechanism remains to be revealed. From the review, in the mid‐latitude North Pacific Ocean, there are complex phenomena of multi‐scale SST anomalies, such as the basin‐scale PDO‐pattern SST anomaly, the frontal‐scale smoothed SST with STFZ intensity anomalies, and the eddy‐scale SST anomalies with the spatial distribution of oceanic eddies.…”

Section: Introductionmentioning

confidence: 99%

The Influences of the Multi‐Scale Sea Surface Temperature Anomalies in the North Pacific on the Jet Stream in Winter

Yihang

Yang

et al. 2023

JGR Atmospheres

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Using Climate Forecast System Reanalysis (CFSR) data and numerical simulations, the impacts of the multi‐scale sea surface temperature (SST) anomalies in the North Pacific on the boreal winter atmospheric circulations are investigated. The basin‐scale SST anomaly as the Pacific Decadal Oscillation (PDO) pattern, a narrow meridional band of frontal‐scale smoothed SST anomaly in the subtropical front zone (STFZ) and the spatial dispersed eddy‐scale SST anomalies within the STFZ are the three types of forcings. The results of statistical methods find that all three oceanic forcings may correspond to the winter North Pacific jet changing with the similar pattern. Furthermore, several atmospheric general circulation model simulations are used to reveal the differences and detail processes of the three forcings. The basin‐scale cold PDO‐pattern SST anomaly first causes negative turbulent heat flux anomalies, atmospheric cooling, and wind deceleration in the lower atmosphere. Subsequently, the cooling temperature with an amplified southern lower temperature gradient and baroclinity brings a lagging middle warming because of the enhanced atmospheric eddy heat transport. The poleward and upward development of baroclinic fluctuations eventually causes the acceleration of the upper jet. The smoothed frontal‐ and eddy‐scales SST anomalies in the STFZ cause comparable anomalous jet as the basin‐scale by changing the upward baroclinic energy and Eliassen‐Palm fluxes. The forcing effects of multi‐scales SST anomalies coexist simultaneously in the mid‐latitude North Pacific, which can cause similar anomalous upper atmospheric circulations. This is probably why it is tricky to define the certain oceanic forcing to the specific observed atmospheric circulation variation.

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Section: Introductionmentioning

confidence: 99%

The Influences of the Multi‐Scale Sea Surface Temperature Anomalies in the North Pacific on the Jet Stream in Winter

Yihang

Yang

et al. 2023

JGR Atmospheres

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“…Some found linear baroclinic response with a sea surface low downstream of the warm SST anomaly (Yulaeva et al 2001;Sutton and Mathieu 2002), while others produced an equivalent barotropic high downstream of the warm SST anomaly (Liu and Wu, 2004). Previous studies have shown that by enhancing the simulation capabilities of ocean eddies in numerical models, the forecast of extratropical cyclones and storm systems over the North Pacific in winter can be improved (Ma et al, 2015(Ma et al, , 2017Szunyogh et al, 2021), but the specific mechanism remains to be revealed. From the review, in the mid-latitude North Pacific Ocean, there are complex phenomena of multi-scale SST anomalies, such as the basin-scale PDO-pattern SST anomaly, the frontal-scale smoothed SST with STFZ intensity anomalies, and the eddy-scale SST anomalies with the spatial distribution of oceanic eddies.…”

mentioning

confidence: 99%

The influences of the multi-scale sea surface temperature anomalies in the North Pacific on the jet stream in winter: Application of Liang-Kleeman information flow method and CAM5.3

Zhao

Yang

et al. 2022

Preprint

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Using Climate Forecast System Reanalysis (CFSR) data and numerical simulations, the impacts of the multi-scale sea surface temperature (SST) anomalies in the North Pacific on the boreal winter atmospheric circulations are investigated. The basinscale SST anomaly as the Pacific Decadal Oscillation (PDO) pattern, a narrow meridional band of frontal-scale smoothed SST anomaly in the subtropical front zone (STFZ) and the spatial dispersed eddy-scale SST anomalies within the STFZ are the three types of forcings. The results of Liang-Kleeman information flow method find that all three oceanic forcings may correspond to the winter North Pacific jet changing with the similar pattern. Furthermore, several simulations are used to reveal the differences and detail processes of the three forcings. The basin-scale cold PDO-pattern SST anomaly first causes negative turbulent heat flux anomalies, atmospheric cooling, and wind deceleration in the lower atmosphere. Subsequently, the cooling temperature with an amplified southern lower temperature gradient and baroclinity brings a lagging middle warming because of the enhanced atmospheric eddy heat transport. The poleward and upward development of baroclinic fluctuations eventually causes the acceleration of the upper jet. The smoothed frontal-and eddy-scale SST anomalies in the STFZ cause comparable anomalous jet as the basin-scale by changing the upward baroclinic energy and E-P fluxes. The forcing effects of multi-scale SST anomalies coexist simultaneously in the mid-latitude North Pacific, which can cause similar anomalous upper atmospheric circulations. This is probably why it is tricky to define the certain oceanic forcing that leads to specific atmospheric circulation variation in observations Hosted file essoar.10512720.1.docx available at https://authorea.com/users/531863/articles/620358-theinfluences-of-the-multi-scale-sea-surface-temperature-anomalies-in-the-north-pacific-onthe-jet-stream-in-winter-application-of-liang-kleeman-information-flow-method-and-cam5-3

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Evaluation of a Coupled Modeling Approach for the Investigation of the Effects of SST Mesoscale Variability on the Atmosphere

Cited by 2 publications

References 20 publications

The Influences of the Multi‐Scale Sea Surface Temperature Anomalies in the North Pacific on the Jet Stream in Winter

The Influences of the Multi‐Scale Sea Surface Temperature Anomalies in the North Pacific on the Jet Stream in Winter

The influences of the multi-scale sea surface temperature anomalies in the North Pacific on the jet stream in winter: Application of Liang-Kleeman information flow method and CAM5.3

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