Spatial changes in two major modes of atmospheric circulation variability during the 20th century

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F23%3A00580719" target="_blank" >RIV/68378289:_____/23:00580719 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/23:10473397

Výsledek na webu

<a href="https://geografie.cz/media/pdf/geografie.2023.017.pdf" target="_blank" >https://geografie.cz/media/pdf/geografie.2023.017.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37040/geografie.2023.017" target="_blank" >10.37040/geografie.2023.017</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spatial changes in two major modes of atmospheric circulation variability during the 20th century

Popis výsledku v původním jazyce

This study presents the time development of two major modes of atmospheric circulation variability in the Northern Hemisphere, the North Atlantic Oscillation (NAO) and the Pacific/North American Pattern (PNA), during the 20th century. We employ 500 hPa winter monthly means of the long-term reanalysis 20CR, which cover the 1871-2011 period. We use a moving Principal Component Analysis calculated for 40-year periods with a one-year step. The spatial structure of NAO is well developed and stable during the whole 20th century using the ensemble mean. However, substantial changes in PNA pattern occur during the late 19th century. Its centres are weaker and smaller, except the centre over the northern Pacific Ocean, which is stronger and larger in the early period. However, these changes are not visible when using ensemble members. Therefore, we suggest that these shifts do not reflect real changes in the atmosphere but are produced by the reanalysis and statistical method itself.

Název v anglickém jazyce

Spatial changes in two major modes of atmospheric circulation variability during the 20th century

Popis výsledku anglicky

This study presents the time development of two major modes of atmospheric circulation variability in the Northern Hemisphere, the North Atlantic Oscillation (NAO) and the Pacific/North American Pattern (PNA), during the 20th century. We employ 500 hPa winter monthly means of the long-term reanalysis 20CR, which cover the 1871-2011 period. We use a moving Principal Component Analysis calculated for 40-year periods with a one-year step. The spatial structure of NAO is well developed and stable during the whole 20th century using the ensemble mean. However, substantial changes in PNA pattern occur during the late 19th century. Its centres are weaker and smaller, except the centre over the northern Pacific Ocean, which is stronger and larger in the early period. However, these changes are not visible when using ensemble members. Therefore, we suggest that these shifts do not reflect real changes in the atmosphere but are produced by the reanalysis and statistical method itself.

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/GA17-07043S" target="_blank" >GA17-07043S: Dálkové vazby - hlavní stavební kameny atmosférické cirkulace</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Geografie

ISSN

1212-0014

e-ISSN

2571-421X

Svazek periodika

128

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

18

Strana od-do

379-396

Kód UT WoS článku

001125204300004

EID výsledku v databázi Scopus

2-s2.0-85179329748