Fig b) pág 167

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Y. Castro Díez, D. Pozo-Vázquez, M.J. Esteban-Parra and S.R. Gámiz-Fortis
Grupo de Física de la Atmósfera. Dpto. Física Aplicada. Facultad de Ciencias, Universidad de Granada, 18071 Granada. Spain. E-mail: [email protected]
RESULT 2nd REOF
DATA: Gridded winter air-temperature (Jones et al.,
1994)
METHOD: PCA
OBJECTIVE: to obtain the general spatio-temporal
characteristics of the temperature variability
PERIOD: 1852-1997
AREA: 10ºW-20ºE
•Explains 20% of the total variance
•Representative mainly of the variability over
southwestern Europe, specially over the Iberian
Peninsula
35ºN-60ºN
Loading factors (by ten) for the 2nd REOF
2nd PC series
Temperaturas PC 2 invierno
3
Correlation Coef. = 0.06
Temperaturas (ºC)(ºC)
Temperature
2
between 2nd PC series
and NAO index
1
Fig b) pág 167
0
non-stat. significant
-1
-2
2000
1990
1980
1970
1960
1950
1940
1930
1920
1910
1900
1890
1880
1870
1860
1850
-3
Tiempo (años)
Year
NCEP/NCAR reanalysis data 1959-1997
SLP and Wind Surface
Anomalies
Indice NAO y anomalías temperatura (º C)
NAO
Index & Temperature anomaly (ºC)
Continuous Line: 2nd PC series
Dashed Line: 1826-1997 winter index representative of the NAO (Jones et al., 1997)
4
3
2
1
0
-1
-2
-3
1950
1960
1970
1980
1990
Tiempo (años)
Year
Years corresponding to
extreme negative NAO phase
Winter 1963
NAO Index = -2.3
Temperature anomaly = -1.0ºC
positive precipitation anomaly
Years corresponding to
extreme positive NAO phase
Winter 1981
NAO Index = +1.3
Temperature anomaly = -0.8ºC
Negative precipitation anomaly
Positive and negative
temperature anomalies can be found
The same NAO extreme phase
Winter 1965
NAO Index = -1.5
Temperature anomaly = -1.3ºC
negative precipitation anomaly
different locations of the south dipole centre
Winter 1990
NAO Index = +2.3
Temperature anomaly = +2.2ºC
positive precipitation anomaly
different temperature anomalies patterns
The location of the south dipole centre
(not the positive or negative character of the NAO phase)
determines the circulation type over the Iberian Peninsula
and, thus, the thermal behaviour
Winter 1979
NAO Index = -1.8
Temperature anomaly = +1.8ºC
positive precipitation anomaly
Winter 1995
NAO Index = +3.0
Temperature anomaly = +2.0ºC
negative precipitation anomaly
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