Resonant interaction between two planetary waves as a precursor for stratospheric warmings?

Wüst, Sabine; Bittner, Michael

doi:10.1016/j.jastp.2011.01.004

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…Graversen and Burtu [] revealed that planetary waves provide the largest fraction of meridional energy transport leading to a net warming over the Arctic. In addition, planetary waves are capable of propagating upward into the stratosphere and are responsible for sudden stratosphere warming events [ Wust and Bittner , ; Watt‐Meyer and Kushner , ]. The THORPEX project pointed out that planetary waves can serve as a link between remote forcing and regional synoptic‐scale patterns and can thereby substantially influence the predictability of high‐impact weather on weekly time scales [ Shapiro and Thorpe , ].…”

Section: Introductionmentioning

confidence: 99%

Daily‐scale planetary wave patterns and the modulation of cold season weather in the northern extratropics

2017

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Tropospheric planetary waves, often linked to asymmetries in lower boundary forcing, significantly modulate atmospheric blocking and storm track structures that are, in turn, linked to extreme surface weather events. Day‐to‐day variability in the planetary scale circulation, taken as wave numbers 1 to 5 in the daily 500 hPa geopotential heights, and the associated impact on storm tracks and regional weather are studied for the period 1950–2005. Six boreal cold‐season distinct planetary wave patterns are identified via hierarchical cluster analysis. The first, second, and sixth patterns feature a prominent zonal wave number 1 structure, while the fourth and fifth patterns resemble the negative and positive phases of northern annular mode, respectively. The second pattern represents an amplification of the climatological mean wave structure, while the third pattern resembles the zonal wave number 3 pattern. A multitaper spectral analysis of the daily projection indices indicates that the planetary wave patterns are primarily intraseasonal in nature. The first (sixth) pattern combines the positive (negative) phase of the Pacific‐North American teleconnection pattern and negative (positive) phase of the North Atlantic Oscillation, inducing poleward (equatorward) shifts in the Pacific storm track and a weakened (strengthened) Atlantic storm track. In contrast, the fourth (fifth) pattern results in a simultaneous equatorward (poleward) displacement of both storm tracks. Extreme cold waves over the continental United States (U.S.) are favored during occurrences of the fourth and sixth patterns. During episodes of the first pattern, increased rainfall prevails over much of the U.S., while precipitation anomalies induced by the other patterns are more regional in nature.

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Section: Introductionmentioning

confidence: 99%

Daily‐scale planetary wave patterns and the modulation of cold season weather in the northern extratropics

2017

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“…Gubbins, 2004) based on the number of spline sampling points used. Depending on the field of interest, either the smoothed data series or the residuals-the subtraction of a spline from the original time series-are further analysed (see for example the work of Kramer et al, 2016;Baumgarten et al, 2015;Zhang et al, 2012;Wüst and Bittner, 2011;Wüst and Bittner, 2008;Young et al, 1997;Eckermann et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Smoothing data series by means of cubic splines: quality of approximation and introduction of an iterative spline approach

Wüst¹,

Wendt²,

Linz³

et al. 2017

Preprint

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Abstract. Cubic splines with equidistant spline sampling points are a common method in atmospheric science for the approximation of undisturbed background conditions by means of filtering superimposed fluctuations from a data series. Often, not only the background conditions are of scientific interest but also the residuals – the subtraction of the spline from the original time series. Based on test data sets, we show that the quality of approximation is not increasing continuously with increasing number of spline sampling points/decreasing distance between two spline sampling points. Splines can generate considerable artificial oscillations in the data. We introduce an iterative spline approach which is able to significantly reduce this phenomenon. We apply it not only to the test data but also to TIMED-SABER temperature data and choose the distance between two spline sampling points in a way that we are sensitive for a large spectrum of gravity waves.

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Multi-exponential wave solutions to two extended Jimbo–Miwa equations and the resonance behavior

Ruan

Zhang

et al. 2020

Applied Mathematics Letters

119

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Resonant interaction between two planetary waves as a precursor for stratospheric warmings?

Cited by 5 publications

References 30 publications

Daily‐scale planetary wave patterns and the modulation of cold season weather in the northern extratropics

Daily‐scale planetary wave patterns and the modulation of cold season weather in the northern extratropics

Smoothing data series by means of cubic splines: quality of approximation and introduction of an iterative spline approach

Multi-exponential wave solutions to two extended Jimbo–Miwa equations and the resonance behavior

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