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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:11 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
The North temperate climate on long-term timescales. Connection to solar variability
Authors:
R. PIRLOAGA(1,2), Venera DOBRICĂ(1)
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
razvan_pirloaga@geodin.ro
Keywords:
NCEP/NCAR database, solar variability, geomagnetic activity
Abstract:
The Earth'’s climate is influenced by solar variability in multiple ways: the well-known effect of changes in the solar irradiance and also via the interaction of the solar wind with Earth’s magnetosphere resulting in the so-called geomagnetic activity. In this study we analyze the possible long-term effects of the solar variability as external natural forcing over the North temperate climate (35 – 65° N band) using surface air temperature (SAT) data from NCEP/NCAR Reanalysis database. The database has a global coverage by 2,5° latitude x 2,5° longitude and a temporal one beginning at 1948 to present. The reanalyzed time series have been compared to the long-term observed surface air temperature for several locations over the Northern Hemisphere, and the differences between them were discussed. In order to obtain the interdecadal and centennial trend in data, time series have been treated by means of 11- and 22-year running averages. The solar signals at Schwabe (11-year) and Hale (22-year) solar cycles have been computed as differences between the initial data and interdecadal trend, and between interdecadal and centennial trends, respectively. The corresponding trends and 11-, 22- signals in SAT will be discussed.
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