Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales
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Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales. / Schmith, T.; Olsen, S. M.; Yang, S.; Christensen, J. H.
In: Geophysical Research Letters, Vol. 49, No. 11, ARTN e2022GL098149, 16.06.2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales
AU - Schmith, T.
AU - Olsen, S. M.
AU - Yang, S.
AU - Christensen, J. H.
PY - 2022/6/16
Y1 - 2022/6/16
N2 - The North Atlantic Oscillation (NAO) index is often characterized by independent positive and negative NAO events with a characteristic spatial pattern and a typical lifetime of around 1 week. These events are separated by periods of near-neutral NAO conditions. Here, we challenge this view by showing in reanalysis and observed data that the strength and spatial shape of NAO events depends on the NAO index prior to the window of 1 week and this dependency is most pronounced for negative NAO events. The influence is seen in the mean sea level pressure, and in other important features, including blocking frequency and jet stream characteristics, and also in air surface temperature and precipitation in parts of Europe. This new appreciation is important for efforts to improve methods for subseasonal-to-seasonal predictions of NAO.
AB - The North Atlantic Oscillation (NAO) index is often characterized by independent positive and negative NAO events with a characteristic spatial pattern and a typical lifetime of around 1 week. These events are separated by periods of near-neutral NAO conditions. Here, we challenge this view by showing in reanalysis and observed data that the strength and spatial shape of NAO events depends on the NAO index prior to the window of 1 week and this dependency is most pronounced for negative NAO events. The influence is seen in the mean sea level pressure, and in other important features, including blocking frequency and jet stream characteristics, and also in air surface temperature and precipitation in parts of Europe. This new appreciation is important for efforts to improve methods for subseasonal-to-seasonal predictions of NAO.
KW - NAO
KW - circulation
KW - synoptic time scale
KW - ATMOSPHERIC BLOCKING
KW - CLIMATE VARIABILITY
KW - TELECONNECTIONS
KW - PREDICTABILITY
KW - LINKS
U2 - 10.1029/2022GL098149
DO - 10.1029/2022GL098149
M3 - Journal article
VL - 49
JO - Geophysical Research Letters (Online)
JF - Geophysical Research Letters (Online)
SN - 1944-8007
IS - 11
M1 - ARTN e2022GL098149
ER -
ID: 315529643