Role of planetary waves in the stratosphere‐troposphere coupled variability in the northern hemisphere winter

Kuroda, Yoji; Kodera, Kunihiko

doi:10.1029/1999gl900507

Cited by 126 publications

(125 citation statements)

References 15 publications

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“…The same dataset is used as that in the previous study [Kuroda and Kodera, 1999]: National Centers for Environmental Prediction (NCEP) operational data combined with the stratospheric data derived from satellite observations [Randel, 1992]. Pentad (five-day) mean data for 18 years (1979 to 1996) covering pressure levels from 850 to i hPa are first created as a basic dataset.…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

“…Thompson and Wallace [1998] considered that the AO extends from the troposphere up into the stratosphere during the winter-spring season. However, recent analysis [Kuroda and Kodera, 1999] indicates that changes in stratospheric zonal wind anomalies first appear in the subtropics and slowly propagate poleward and downward into the troposphere. Similar downward penetration of circulation anomalies related to the AO is also found in the analysis by Baldwin and Dunkerton [1999].…”

Section: Introductionmentioning

confidence: 99%

“…In a previous paper, Kuroda and Kodera [1999] investigated how the tropospheric variability is related to changes in the stratospheric mode of variability. In order to get complete information, in the present paper, we examine how the stratospheric variability is associated with the change …”

Section: Introductionmentioning

confidence: 99%

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Tropospheric and stratospheric aspects of the Arctic oscillation

Kodera¹,

Kuroda²

2000

Geophysical Research Letters

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Abstract. The role of the stratospheric variability in the Arctic Oscillation (AO) is investigated by selecting 18 large month-to-month variation events. It is shown that although tropospheric features are very similar, the vertical structure of the AO differs considerably depending on whether it is initiated by a downward propagation of zonal-mean zonal wind anomalies from the stratosphere (type S) or it is produced within the troposphere (type T). Type S events preferentially occur during February and March, while type T events are seen during November and December. The results of the analysis suggest that diverse aspects of the AOrelated variability can more easily be understood as coupling and uncoupling of stratospheric and tropospheric modes of variability.

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Section: Data and Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tropospheric and stratospheric aspects of the Arctic oscillation

Kodera¹,

Kuroda²

2000

Geophysical Research Letters

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“…In particular, the three positive centres between 40 • N and 60 • N are nearly collocated. Based on the later study, it could arguably be understood as a downward influence of the enhanced positive phase of the northern annular mode, or NAM (Baldwin and Dunkerton, 1999;Kuroda and Kodera, 1999), associated with the cold polar stratosphere. In the stratosphere (50 mb), the anomalies show clear evidence of a strengthened polar vortex, maximizing at lag 0, and fading at lag +1.…”

Section: The 500 Mb Tropospheric Circulation During Cold Stratospherimentioning

confidence: 99%

Variability of the Northern Hemisphere polar stratospheric cloud potential: the role of North Pacific disturbances

Orsolini

Karpechko

Nikulin

2009

Quart J Royal Meteoro Soc

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ABSTRACT:The potential of the Arctic stratosphere to sustain the formation of Polar Stratospheric Clouds (PSCs) is a key factor in determining the amount of ozone destroyed each winter, and is often measured as a 'PSC volume'. The latter quantity has been shown to closely follow a near-linear compact relationship with winter-averaged column ozone loss, and displays a high variability from monthly to decadal time-scales. We examine the connection between meteorological conditions in the troposphere and the variability of lower polar stratospheric temperatures over the last four decades, and specifically, conditions leading to a high PSC volume. In addition to the well-established connection between the North Atlantic Oscillation (NAO) and the polar vortex, we demonstrate the large influence of precursory disturbances over the North Pacific and the Far East, the region of maximum climatological upward wave activity flux. Namely, very high monthly PSC volume (in the top 12%) predominantly follows the development of positive tropospheric height anomalies over the Far East, which lead to a weakening of the background planetary wave trough, and lessened upward wave activity flux into the stratosphere. Precursory anomalies over the Far East are reminiscent of East Asian monsoon amplification episodes.

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“…However, studies in the recent decades have revealed that stratosphere can play an important role in the near surface climate change. For example, data diagnosis showed that the stratosphere zonal-mean zonal wind anomalies can propagate poleward and downward to the troposphere consecutively from the stratopause region (Christiansen 2001;Kodera 1995;Kuroda and Kodera 1999). It was further illustrated that the anomalous Arctic Oscillation (AO) signal, which is the dominant mode of the geopotential fields north of 20°N, appears firstly in the upper stratosphere, and propagates all the way down to the troposphere and can have significant influence on the surface extended-range weather and shortterm climate Dunkerton, 1999, 2001;Baldwin et al, 2003b;Moritz et al, 2002).…”

Section: Introductionmentioning

confidence: 99%