Interdecadal change of winter SST variability in the Kuroshio Extension region and its linkage with Aleutian atmospheric low pressure system

Yu, Peilong; Zhang, Lifeng; Zhang, Yongchui; Deng, Bing

doi:10.1007/s13131-016-0859-0

Cited by 7 publications

(4 citation statements)

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“…In order to further understand the advantage of the EAI, a power spectrum analysis was conducted. Surprisingly, this index mainly shows significant oscillations with a period of about 8 years (Figure 2a), which is different with the period of about 10 years in KE jet fluctuations reported by previous studies [26][27][28][29]. Actually, the conventional EKE index also shows the spectral peak of about 8 years, but it is not statistically significant (Figure 2b).…”

Section: Advantage Of the New Eaicontrasting

confidence: 77%

An Index for Depicting the Long-Term Variability of Mesoscale Eddy Activity over the Kuroshio Extension Region

Zhang

et al. 2020

Atmosphere

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Using high-resolution satellite-derived sea surface temperature (SST) data from September 1981 to December 2015, the present study develops a new index to detect the long-term variation in mesoscale eddy activity over the Kuroshio Extension (KE) region. This eddy activity index (EAI) highlights the strength of eddy-induced poleward heat transport and has obvious advantages over the other existing KE indices in depicting the low-frequency changes in KE eddy activity. An analysis of the EAI shows that over the long term, the KE eddy activity variability presents a significant spectral peak of about 8 years and is not directly modulated by wind-driven oceanic Rossby waves generated in the central North Pacific. When the EAI is positive, the strengthened KE eddy activity significantly enhances the heat release from ocean to atmosphere over the Kuroshio–Oyashio confluence region (KOCR). This induces an anomalous dipole pattern of near-surface baroclinicity over this region that can persist for up to 6 months, favoring a weakened and northward-moving East Asian jet, and vice versa. It is believed that the new EAI will facilitate future studies focusing on the climatic effects of the KE eddy activity variation.

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Section: Advantage Of the New Eaicontrasting

confidence: 77%

An Index for Depicting the Long-Term Variability of Mesoscale Eddy Activity over the Kuroshio Extension Region

Zhang

et al. 2020

Atmosphere

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“…As a result, downward latent and sensible heat fluxes in these areas increase (Figures 11a and 11b). The cold Ekman advection anomalies along 30°N (Figure 10b) are associated with a basin-scale cyclonic wind stress anomaly and intensified Aleutian Low [Wang et al, 2012;Yu et al, 2016].…”

Section: Wintermentioning

confidence: 99%

An observational study of the North Pacific storm‐track impact on the midlatitude oceanic front

et al. 2017

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A lagged Maximum Covariance Analysis is used to examine the impact of North Pacific storm‐track activity on midlatitude oceanic frontal intensity in this study. It is found that an enhanced storm track tends to intensify the oceanic frontal intensity with a lag of 1–2 months. The forcing effect of storm‐track anomalies on oceanic frontal intensity is strongest in autumn, followed by that in summer and winter, and it is weakest in spring. Moreover, the mixed layer heat budget analysis suggests that sea surface temperature anomalies (SSTAs) related to oceanic fronts are primarily attributed to the storm‐track‐induced net surface heat flux and Ekman advection anomalies, while contributions of geostrophic advection and entrainment are relatively small. In summer and autumn, the impact of net surface heat flux anomalies on SSTAs plays a more important role than that of Ekman heat transport anomalies. Whereas in winter, Ekman heat transport anomaly forcing is comparable to the net surface heat flux forcing. Anomalous turbulent heat fluxes contribute to generating net surface heat flux anomalies in those three seasons, while the shortwave radiative fluxes make a strong contribution in summer but have little impact in winter. The anomalies of both net surface heat flux and Ekman heat transport are presumed to be associated with storm‐track‐induced surface wind anomalies. Results of the present study provide observational evidences for the positive feedback between the North Pacific storm‐track activity and midlatitude oceanic frontal intensity.

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“…In recent decades, the climate variability over the North Pacific experienced significant decadal changes (Miyasaka et al., 2014; Yu et al., 2016). For example, Miyasaka et al.…”

Section: Introductionmentioning

confidence: 99%

“…In recent decades, the climate variability over the North Pacific experienced significant decadal changes (Miyasaka et al, 2014;Yu et al, 2016). For example, Miyasaka et al (2014) indicated that the dominant decadal variability of the North Pacific sea surface temperature (SST) is along the subarctic frontal zone from the 1950s to the 1980s, which is highly correlated with the decadal variability of the AL.…”

mentioning

confidence: 99%

Diminished Impact of the East Asian Winter Monsoon on the Maritime Continent Rainfall After the Late‐1990s Tied to Weakened Siberian High–Aleutian Low Covariation

et al. 2023

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Interdecadal change of winter SST variability in the Kuroshio Extension region and its linkage with Aleutian atmospheric low pressure system

Cited by 7 publications

References 50 publications

An Index for Depicting the Long-Term Variability of Mesoscale Eddy Activity over the Kuroshio Extension Region

An Index for Depicting the Long-Term Variability of Mesoscale Eddy Activity over the Kuroshio Extension Region

An observational study of the North Pacific storm‐track impact on the midlatitude oceanic front

Diminished Impact of the East Asian Winter Monsoon on the Maritime Continent Rainfall After the Late‐1990s Tied to Weakened Siberian High–Aleutian Low Covariation

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