The connection between geomagnetic secular variations and atmospheric circulation and climate changes in europe

2004 ◽  
Vol 10 (5-6) ◽  
pp. 93-99
Author(s):  
V. Bakhmutov ◽  
Keyword(s):  
Atmospheric Circulation ◽  
Climate Changes ◽  
Secular Variations

scholarly journals Oceanic Impact on European Climate Changes during the Quaternary

Geosciences ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 119
Author(s):  
Gloria Martin-Garcia
Keyword(s):  
Atmospheric Circulation ◽  
North Atlantic ◽  
Deep Water ◽  
Climate Changes ◽  
Formation Rate ◽  
Ice Sheet ◽  
Southern Europe ◽  
The North ◽  
European Climate ◽  
The North Atlantic

Integrative studies on paleoclimate variations over oceanic and continental regions are scarce. Though it is known that Earth’s climate is strongly affected by sea-air exchanges of heat and moisture, the role of oceans in climate variations over land remains relatively unexplored. With the aim to unveil this influence, the present work studies major climate oscillations in the North Atlantic region and Europe during the Quaternary, focusing on the oceanic mechanisms that were related to them. During this period, the European climate experienced long-term and wide-amplitude glacial-interglacial oscillations. A covariance between the North Atlantic sea surface temperature and climate signals over the continent is especially observed in Southern Europe. The most severe and drastic climate changes occurred in association to deglaciations, as a consequence of major oceanographic reorganizations that affected atmospheric circulation and ocean-atmosphere heat-flow, which led to variation of temperature and precipitation inland. Most deglaciations began when Northern Hemisphere summer insolation was maximal. Increased heating facilitated the rapid ice-sheet collapse and the massive release of fresh water into the Northern Atlantic, which triggered the weakening or even the shutdown of the North Atlantic Deep Water (NADW) formation. Though the extension of ice-sheets determined the high-latitude European climate, the climate was more influenced by rapid variations of ice volume, deep-water formation rate, and oceanic and atmospheric circulation in middle and subtropical latitudes. In consequence, the coldest stadials in the mid-latitude North Atlantic and Europe since the early Pleistocene coincided with Terminations (glacial/interglacial transitions) and lesser ice-sheet depletions. They were related with decreases in the NADW formation rate that occurred at these times and the subsequent advection of subpolar waters along the western European margin. In Southern Europe, steppe communities substituted temperate forests. Once the freshwater perturbation stopped and the overturning circulation resumed, very rapid and wide-amplitude warming episodes occurred (interstadials). On the continent, raised temperature and precipitations allowed the rapid expansion of moisture-requiring vegetation.

Atmospheric circulation climate changes

1995 ◽  
Vol 31 (2-4) ◽  
pp. 427-453 ◽  
Author(s):  
Kevin E. Trenberth
Keyword(s):  
Atmospheric Circulation ◽  
Climate Changes

Atmospheric circulation epochs and climate changes

2008 ◽  
Vol 33 (9) ◽  
pp. 553-559 ◽  
Author(s):  
N. S. Sidorenkov ◽  
I. A. Orlov
Keyword(s):  
Atmospheric Circulation ◽  
Climate Changes

Atmospheric circulation patterns during late Pleistocene climate changes at Lake Malawi, Africa

2011 ◽  
Vol 312 (3-4) ◽  
pp. 318-326 ◽  
Author(s):  
Bronwen L. Konecky ◽  
James M. Russell ◽  
Thomas C. Johnson ◽  
Erik T. Brown ◽  
Melissa A. Berke ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
Late Pleistocene ◽  
Climate Changes ◽  
Lake Malawi ◽  
Atmospheric Circulation Patterns ◽  
Pleistocene Climate ◽  
Circulation Patterns

Zonal and tesseral harmonic perturbations of an artificial satellite

1966 ◽  
Vol 25 ◽  
pp. 323-325 ◽  
Author(s):  
B. Garfinkel
Keyword(s):  
Angular Velocity ◽  
Spherical Harmonics ◽  
Artificial Satellite ◽  
Compact Form ◽  
Earth’S Rotation ◽  
Earth's Rotation ◽  
Secular Variations ◽  
Tesseral Harmonics

The paper extends the known solution of the Main Problem to include the effects of the higher spherical harmonics of the geopotential. The von Zeipel method is used to calculate the secular variations of orderJmand the long-periodic variations of ordersJm/J2andnJm,λ/ω. HereJmandJm,λare the coefficients of the zonal and the tesseral harmonics respectively, withJm,0=Jm, andωis the angular velocity of the Earth's rotation. With the aid of the theory of spherical harmonics the results are expressed in a most compact form.

On the Configuration of the Magnetic Field of β CrB

1976 ◽  
Vol 32 ◽  
pp. 613-622
Author(s):  
I.A. Aslanov ◽  
Yu.S. Rustamov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Radial Velocity ◽  
Magnetic Field Strength ◽  
Complex Shape ◽  
Rotation Period ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Secular Variations ◽  
The Magnetic Field

SummaryMeasurements of the radial velocities and magnetic field strength of β CrB were carried out. It is shown that there is a variability with the rotation period different for various elements. The curve of the magnetic field variation measured from lines of 5 different elements: FeI, CrI, CrII, TiII, ScII and CaI has a complex shape specific for each element. This may be due to the presence of magnetic spots on the stellar surface. A comparison with the radial velocity curves suggests the presence of a least 4 spots of Ti and Cr coinciding with magnetic spots. A change of the magnetic field with optical depth is shown. The curve of the Heffvariation with the rotation period is given. A possibility of secular variations of the magnetic field is shown.

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