Sea surface salinity response to variations in the Aleutian Low

Grodsky, Semyon A.; Reul, Nicolás; Vandemark, D.

doi:10.1016/j.jmarsys.2023.103888

Cited by 3 publications

(6 citation statements)

References 33 publications

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“…The salinification in region V, which is located downstream of region IV, was also caused by horizontal advection mainly. This is consistent with the indication of previous studies for the eastward propagation of subarctic salinity anomalies (Cummins & Masson, 2018; Grodsky et al., 2023; Zhi et al., 2019). In region II, the effect of geostrophic advection controlled salinification.…”

Section: Reasons For the Salinity Changessupporting

confidence: 93%

“…The eastward propagation speed of the anomaly in the subarctic was 3.1 cm s −1 (not shown), which is close to the mean zonal geostrophic velocity over the Subarctic Current in the upper layer shown by Cummins and Masson (2018) and Grodsky et al. (2023). The anomaly in Region V north of 45°N propagated northward into Region VII along the Alaska Current (Figures 5 and 6).…”

Section: Spatiotemporal Variations Of Upper‐ocean Salinitysupporting

confidence: 79%

“…Grodsky et al. (2023) showed that positive (negative) salinity anomaly appeared in the subarctic after the Aleutian Low weakened (strengthened). Meanwhile, the location of the maximum salinity gradient at 100 dbar also migrated southward during the 2010s (Figure 11a).…”

Section: Reasons For the Salinity Changesmentioning

confidence: 99%

“…(2021) reported that anomalous temperature increases frequently occurred in the Oyashio region south of Hokkaido during the summer of 2010–2016 mainly due to the intrusions of warm, saline water from the Kuroshio Extension. Salinity became anomalously high in the surface layer above 150 m depth when one of the most significant, famous marine heatwaves, the Blob, occurred in the northeastern North Pacific Ocean (NP) in 2014–2016 (Cummins & Masson, 2018; Grodsky et al., 2023; Zhi et al., 2019). Zhi et al.…”

Section: Introductionmentioning

confidence: 99%

“…(2019) pointed out that freshening before the Blob event contributed to shallowing the mixed layer, resulting in the strong warming. Just after the freshening, positive salinity anomaly propagated eastward in the subarctic and reached the Blob region following the weakening of the Aleutian Low (Grodsky et al., 2023). Meanwhile, El Niño events cause salinity anomalies in the tropics and subtropics through changes of horizontal advection and freshwater flux (e.g., Delcroix & Picaut, 1998; Hasson et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Variations in Upper‐Ocean Salinity Over the North Pacific in 2004–2021

Kawai,

Katsura,

Hosoda

2024

JGR Oceans

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Interannual variations in upper ocean salinity in the North Pacific Ocean (NP) were examined comprehensively over a period of 18 years (2004–2021) with gridded data sets considering vertical profiles of salinity. The salinity in nearly half of the basin varied in phase with a slight lag, and the rest of the basin exhibited the opposite phase on a decadal scale. The average salinity above 400 dbar prominently increased in the eastern and western mid‐latitude regions from approximately 2010 to the latter half of the 2010s, and decreased in the central subarctic and subtropics during the same period. This spatial pattern was similar to that of temperature change. While the freshening in the subtropics was remarkably above 100 dbar, salinity changes in the subarctic were large even in the subsurface. The first mode of the complex empirical orthogonal function analysis indicated the eastward (westward) propagation of salinity anomalies in the subarctic (subtropics), that is, a clockwise shift. Salinity budget analysis revealed that the changes in the 2010s were mainly caused by geostrophic advection in zonal regions around 40°N and 20°N, and the eastern NP. Precipitation also contributed to freshening in the subtropics, but not in the central subarctic. The meridional migration of salinity fronts in the subarctic and subtropics induced by wind stress, which is meridional contraction of the subtropical gyre, contributed to freshening in the central NP. It is unclear whether salinification in the eastern and western regions inevitably synchronizes and should be further examined.

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Section: Reasons For the Salinity Changessupporting

confidence: 93%

Section: Spatiotemporal Variations Of Upper‐ocean Salinitysupporting

confidence: 79%

Section: Reasons For the Salinity Changesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spatiotemporal Variations in Upper‐Ocean Salinity Over the North Pacific in 2004–2021

Kawai,

Katsura,

Hosoda

2024

JGR Oceans

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WITHDRAWN: Interactions of the background state and eddies in shaping Aleutian Low variation

Lin,

Zhang,

Ren

et al. 2024

Preprint

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The Aleutian Low (AL) is a dominant feature of the mean circulation in the North Pacific during the winter season. The background stationary wave, air-sea interaction, and transient eddies over the North Pacific exert distinct impacts on the interannual variations of the AL intensity and position. In this study, we adopt the geopotential tendency equation to investigate the roles of various physical processes in the maintenance and interannual variation of the AL. It shows that the absolute vorticity advection plays the most important role in the formation and maintenance of the AL intensity, while the high-frequency transient eddies contribute most to both the meridional and zonal shifts of the AL. The high-frequency transient eddy vorticity forcing affects the AL through barotropic energy conversion process, and in turn the AL enhances the high-frequency transient eddies through baroclinic energy conversion process, forming a positive feedback. The associated high-frequency eddy kinetic energy anomalies exhibit an eastward movement to the east coast of North America in the years of intensified AL, which explains why the strengthening of the AL is often accompanied by an eastward movement. Furthermore, the energy conversion terms of high-frequency transient eddies are mostly located over the eastern part of the extratropical North Pacific, leading to asymmetric features in the zonal movement of the AL.

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WITHDRAWN: Interactions of the background state and eddies in shaping Aleutian Low variation

Lin,

Zhang,

Ren

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Sea surface salinity response to variations in the Aleutian Low

Cited by 3 publications

References 33 publications

Spatiotemporal Variations in Upper‐Ocean Salinity Over the North Pacific in 2004–2021

Spatiotemporal Variations in Upper‐Ocean Salinity Over the North Pacific in 2004–2021

WITHDRAWN: Interactions of the background state and eddies in shaping Aleutian Low variation

WITHDRAWN: Interactions of the background state and eddies in shaping Aleutian Low variation

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