Longitudinal structure of stationary planetary waves in the middle atmosphere–extraordinary years

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F18%3A00486127" target="_blank" >RIV/68378289:_____/18:00486127 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.5194/angeo-36-181-2018" target="_blank" >http://dx.doi.org/10.5194/angeo-36-181-2018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/angeo-36-181-2018" target="_blank" >10.5194/angeo-36-181-2018</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Longitudinal structure of stationary planetary waves in the middle atmosphere–extraordinary years

Popis výsledku v původním jazyce

One important but little studied factor in the middle atmosphere meridional circulation is its longitudinal structure. Kozubek et al. (2015) disclosed the existence of the two-cell longitudinal structure in meridional wind at 10hPa at higher latitudes in January. This two-cell structure is a consequence of the stratospheric stationary wave SPW1 in geopotential heights. Therefore here the longitudinal structure in geopotential heights and meridional wind is analysed based on MERRA data over 1979-2013 and limited NOGAPS-ALPHA data in order to find its persistence and altitudinal dependence with focus on extraordinary years. The SPW1 in geopotentia lheights and related two-cell structure in meridional wind covers the middle stratosphere (lower boundary ∼50hPa), upper stratosphere and most of the mesosphere (almost up to about 0.01hPa). The two-cell longitudinal structure in meridional wind is a relatively persistent feature, only 9 out of 35 winters (Januaries) display more complex structure. Morphologically the deviation of these extraordinary Januaries consists in upward propagation of the second (Euro-Atlantic) peak (i.e. SPW2 structure) to higher altitudes than usually, mostly up to the mesosphere. Allthese Januaries occurred under the positive phase of PNA (Pacific North American) index but there are also other Januaries under its positive phase, which behave in an ordinary way. The decisive role in the existence of extraordinary years (Januaries) appears to be played by the SPW filtering by the zonal wind pattern. In all ordinary years the mean zonal wind pattern in January allows the upward propagation of SPW1 (Aleutian peak in geopotential heights) up to the mesosphere but it does not allow the upward propagation of the EuroAtlantic SPW2 peak to and above the 10hPa level. On the other hand, the mean zonal wind filtering pattern in extraordinary Januaries is consistent with the observed pattern of geopotential heights at higher altitudes.n

Název v anglickém jazyce

Longitudinal structure of stationary planetary waves in the middle atmosphere–extraordinary years

Popis výsledku anglicky

One important but little studied factor in the middle atmosphere meridional circulation is its longitudinal structure. Kozubek et al. (2015) disclosed the existence of the two-cell longitudinal structure in meridional wind at 10hPa at higher latitudes in January. This two-cell structure is a consequence of the stratospheric stationary wave SPW1 in geopotential heights. Therefore here the longitudinal structure in geopotential heights and meridional wind is analysed based on MERRA data over 1979-2013 and limited NOGAPS-ALPHA data in order to find its persistence and altitudinal dependence with focus on extraordinary years. The SPW1 in geopotentia lheights and related two-cell structure in meridional wind covers the middle stratosphere (lower boundary ∼50hPa), upper stratosphere and most of the mesosphere (almost up to about 0.01hPa). The two-cell longitudinal structure in meridional wind is a relatively persistent feature, only 9 out of 35 winters (Januaries) display more complex structure. Morphologically the deviation of these extraordinary Januaries consists in upward propagation of the second (Euro-Atlantic) peak (i.e. SPW2 structure) to higher altitudes than usually, mostly up to the mesosphere. Allthese Januaries occurred under the positive phase of PNA (Pacific North American) index but there are also other Januaries under its positive phase, which behave in an ordinary way. The decisive role in the existence of extraordinary years (Januaries) appears to be played by the SPW filtering by the zonal wind pattern. In all ordinary years the mean zonal wind pattern in January allows the upward propagation of SPW1 (Aleutian peak in geopotential heights) up to the mesosphere but it does not allow the upward propagation of the EuroAtlantic SPW2 peak to and above the 10hPa level. On the other hand, the mean zonal wind filtering pattern in extraordinary Januaries is consistent with the observed pattern of geopotential heights at higher altitudes.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

<a href="/cs/project/GA15-03909S" target="_blank" >GA15-03909S: Scénář dlouhodobých trendů v systému stratosféra-mezosféra-termosféra-ionosféra</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Annales Geophysicae

ISSN

0992-7689

e-ISSN

—

Svazek periodika

36

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

181-192

Kód UT WoS článku

000423805400001

EID výsledku v databázi Scopus

2-s2.0-85041417307