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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:08 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
The connection between long-term variation of annual mean temperature and solar activity at mid-latitudes of the Northern Hemisphere
Authors:
Razvan PIRLOAGA(1,2), Venera DOBRICA(1), Sabina STEFAN(2)
Affiliation:
(1)Institute of Geodynamics, Romanian Academy, Bucharest, Romania
(2)University of Bucharest, Faculty of Physics, P.O. BOX MG-11, Magurele, Romania
E-mail
Keywords:
reanalyzed temperatures,Northern Hemisphere, solar/geomagnetic activity,
Abstract:
In this study the possible long-term effects of solar variability over the mid-latitudes of the Northern Hemisphere, found in annual means of temperature data from NCEP/NCAR Reanalysis database are discussed. For comparison we also used ERA-40 (ECMWF) and observation (ECA&D) time series. The reanalyzed time series have been compared with each other and with the observed ones for different locations over the temperate zone (35 – 65° band) of the Northern Hemisphere. The similarities and differences are discussed. In order to infer the effects of solar variability on temperature, data have been processed to obtain signals at the 11-year and at the 22-year solar cycle timescales. The connection between solar/geomagnetic variability, described by solar and geomagnetic indices (the sunspot number R and, respectively the Raa geomagnetic index) and reanalyzed temperature data is investigated by correlation maps at the scale of northern temperate climate area.
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