Observed positive feedback between the NAO and the North Atlantic SSTA tripole

Pan, Linlin

doi:10.1029/2005gl022427

Cited by 96 publications

(87 citation statements)

References 17 publications

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“…The KOElike SST anomalies can provide anomalous forcing to the regional climate especially when the atmosphere has reduced its internal variability during spring. Most recently, Pan (2005) demonstrated that there is a positive feedback between the NAO and the tripole pattern of the SST anomalies in the North Atlantic, which supports our results on the coupling between SST anomalies and the overlying atmosphere in the extratropics. Miller and Schneider (2000) have suggested that the response of the western Pacific SST to decadal forcing by the Aleutian Low is a 2-5 year lagged KOE SST pattern.…”

Section: Summary and Discussionsupporting

confidence: 80%

A seasonally lagged signal of the North Atlantic Oscillation (NAO) in the North Pacific

Hong-yan

Moore

2006

Intl Journal of Climatology

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The North Atlantic Oscillation (NAO) has been identified as an important mode of variability in the climate system. However, little is known about its impact on the climate of the North Pacific region. In this paper, we discuss the existence of a seasonally lagged signal of the NAO in the North Pacific region. In particular, we show that the spring sea-level pressures (SLPs) and surface temperatures in the region are positively correlated with the characteristics of the NAO during the preceding winter. This signal is identified in a number of long-term climate data sets including a Japanese tree-ring time series that has been shown to be a proxy for spring temperatures in the North Pacific region. We identify two distinct mechanisms responsible for this lagged signal: one involving sea-surface temperature anomalies in the North Pacific and the other involving Eurasian snow anomalies. We show that both these anomalies develop during the winter and persist into spring, resulting in the observed lagged response.

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Section: Summary and Discussionsupporting

confidence: 80%

A seasonally lagged signal of the North Atlantic Oscillation (NAO) in the North Pacific

Hong-yan

Moore

2006

Intl Journal of Climatology

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“…The heat flux anomalies associated with the NAO can enhance or diminish the impact of ENSO, depending on the NAO phase (e.g., Grö tzner et al 1998;Giannini et al 2001b;Czaja et al 2002). It has been demonstrated that atmospheric anomalies associated with NAO produce tripolelike SSTA in the North Atlantic (Deser and Timlin 1997;Marshall et al 2001;Pan 2005). As the tropical Atlantic signature of the NAO-forced SST tripole in the North Atlantic, the NTA SST variability is also modulated by the NAO.…”

Section: Influences Of the Nao On The Nta Wpbmentioning

confidence: 96%

Winter Persistence Barrier of Sea Surface Temperature in the Northern Tropical Atlantic Associated with ENSO

Ding

2011

Journal of Climate

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This study investigates the persistence characteristics of the sea surface temperature anomaly (SSTA) in the northern tropical Atlantic (NTA). It is found that a persistence barrier exists around December and January. This winter persistence barrier (WPB) is prominent during the mature phase of strong ENSO events but becomes indistinct during weak ENSO and normal (non-ENSO) events. During strong El Niñ o events, the NTA SSTA shows a reversal in sign and a rapid warming during December and January. It is possible that this SSTA sign reversal reduces the persistence, leading to the occurrence of the NTA WPB. The present analyses indicate a dynamic relationship among the Pacific ENSO, the NTA SSTA, and the NTA WPB on a quasibiennial time scale: a strong El Niñ o event is usually preceded by a strong La Niñ a event, which leads to a sign reversal of the NTA SSTA in winter as a delayed response to ENSO, finally resulting in the NTA WPB. Analyses also suggest that the NTA WPB is affected by the North Atlantic Oscillation (NAO). The NAO enhances the persistence of the NTA SSTA during winter, tending to weaken the NTA WPB.

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“…A number of factors contribute to the less distinct nature of the NAE teleconnection. Transient eddy feedbacks and air-sea interactions are important (Watanabe and Kimoto 1999;Pan 2005), with North Atlantic SSTs playing a possible role in delaying the response to ENSO or modifying it to project onto the North Atlantic Oscillation (Herceg-Bulić and Kucharski 2012). A more general challenge for simulating ENSO impacts is the chaotic nature of the midlatitude atmosphere, which reduces the signal-tonoise ratio and limits predictability, also giving rise to uncertainty on what the real-world teleconnection actually is (Deser et al 2017).…”

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confidence: 99%

Importance of Late Fall ENSO Teleconnection in the Euro-Atlantic Sector

King

Bulić

Bladé

et al. 2018

Bulletin of the American Meteorological Society

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Recent studies have indicated the importance of fall climate forcings and teleconnections in influencing the climate of the northern mid- to high latitudes. Here, we present some exploratory analyses using observational data and seasonal hindcasts, with the aim of highlighting the potential of the El Niño–Southern Oscillation (ENSO) as a driver of climate variability during boreal late fall and early winter (November and December) in the North Atlantic–European sector, and motivating further research on this relatively unexplored topic. The atmospheric ENSO teleconnection in November and December is reminiscent of the east Atlantic pattern and distinct from the well-known arching extratropical Rossby wave train found from January to March. Temperature and precipitation over Europe in November are positively correlated with the Niño-3.4 index, which suggests a potentially important ENSO climate impact during late fall. In particular, the ENSO-related temperature anomaly extends over a much larger area than during the subsequent winter months. We discuss the implications of these results and pose some research questions.

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Observed positive feedback between the NAO and the North Atlantic SSTA tripole

Cited by 96 publications

References 17 publications

A seasonally lagged signal of the North Atlantic Oscillation (NAO) in the North Pacific

A seasonally lagged signal of the North Atlantic Oscillation (NAO) in the North Pacific

Winter Persistence Barrier of Sea Surface Temperature in the Northern Tropical Atlantic Associated with ENSO

Importance of Late Fall ENSO Teleconnection in the Euro-Atlantic Sector

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