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Titel |
Dominant modes of Diurnal Temperature Range variability over Europe and their relationships with large-scale atmospheric circulation and sea surface temperature anomaly patterns |
VerfasserIn |
Monica Ionita-Scholz, Gerrit Lohmann, Norel Rimbu, Patrick Scholz |
Konferenz |
EGU General Assembly 2013
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 15 (2013) |
Datensatznummer |
250078224
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Zusammenfassung |
The relationships between the dominant modes of interannual variability of Diurnal
Temperature Range (DTR) over Europe and large-scale atmospheric circulation and sea
surface temperature anomaly fields are investigated through statistical analysis of observed
and reanalysis data. It is shown that the dominant DTR modes as well as their relationship
with large-scale atmospheric circulation and sea surface temperature anomaly fields are
specific for each season.
During winter the first and second modes of interannual DTR variability are strongly
related with the North Atlantic Oscillation and the Scandinavian pattern, while the third mode
is related with the Atlantic Multidecadal Oscillation. Strong influence of the Atlantic
Multidecadal Oscillation and the Arctic Oscillation on spring DTR modes of variability was
also detected. During summer the DTR variability is influenced mostly by a blocking-like
pattern over Europe, while the autumn DTR variability is associated with a wave-train like
pattern, which develops over the Atlantic Ocean and extends up to Siberia. It is also found
that the response of DTR to global sea surface temperature is much weaker in spring and
summer comparing to winter and autumn. A correlation analysis reveals a strong relationship
between DTR modes of variability and the Cloud Cover anomalies during all seasons.
The influence of the potential evapotranspiration and precipitation anomalies on
DTR modes of variability is strongest during summer, but it is significant also in
spring and autumn. It is suggested that a large part of interannual to decadal DTR
variability over Europe is induced by the large-scale climate anomaly patterns via
modulation of cloud cover, precipitation and potential evapotranspiration anomaly fields. |
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