The geomagnetic field's imprint on the twentieth century's climate variability

Kilifarska, N.; Бахмутов, В. Г.; Melnyk, G. V.

doi:10.1144/sp497-2019-38

Cited by 3 publications

(1 citation statement)

References 90 publications

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“…Finally, in this section, a discussion on the possible relationship between geomagnetic field intensity and climate is included. Kilifarska et al (2020) analyse several climatic variables during the twentieth century in order to offer evidence of a possible geomagnetic 'signal' imprinted on climate. Their analyses show that the geomagnetic field-climate relationship is not rigid, but is rather a flexible one, because it is mediated by the near-tropopause ionization, ozone and humidity, each of which is subject to other influences.…”

Section: Palaeosecular Variation Sediments and Climatementioning

confidence: 99%

Geomagnetic field variations in the past: an introduction

Chiara

Herrero‐Bervera²,

Tema

2020

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In the last decades, palaeomagnetic research has provided us with a picture of the temporal and spatial behaviour of the Earth's magnetic field (EMF) from its origin up to the present day. Well-dated palaeomagnetic data offer important sources of information about the past variation of the geomagnetic field and have shown that it is characterized by temporal fluctuations such as reversals, excursions and spikes. Despite the advances in our understanding of EMF behaviour, the current dataset is biased towards high and northern latitudes and, therefore, several questions remain open to debate, such as the origin and evolution of the EMF and the frequency and spatial distribution of its variations. This Special Publication focuses on the study of the temporal and spatial evolution of the EMF in the past through new data from palaeomagnetic and rock magnetic studies of archaeological materials, sediments and lavas from Europe, Africa, Australia, New Zealand, India and Baltic Sea, and their applications in archaeology, stratigraphy and climate. This paper summarizes our current knowledge on geomagnetic field variations in the past, open questions and future challenges and gives an overview of the volume's context, which aims to disclose fundamental properties of the Earth's magnetic field evolution. EMF variation in the past: state of the art and open questions Reference data and mathematical models have shown that the EMF is characterized by continuous spatial

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Section: Palaeosecular Variation Sediments and Climatementioning

confidence: 99%

Geomagnetic field variations in the past: an introduction

Chiara

Herrero‐Bervera²,

Tema

2020

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Interpretation of space-time temperature variations in Antarctica in connection with changes in the geomagnetic field and low stratospheric ozone

Bakhmutov

Kilifarska

Melnyk

et al. 2020

UAJ

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In this work we review space-time temperature variations in Antarctica and possible ways the various geophysical factors caused by fluctuations of the main geomagnetic field could influence it. We analyzed data of direct ground observations of temperature and the geomagnetic field, and data of ERA-20CM and ERA Interim on air temperature variation, ozone concentration and specific humidity at the upper troposphere-lower stratosphere level. The values of module of total intensity of the magnetic field vector were calculated according to the IGRF model. Time series of galactic cosmic rays (annual data since 1700) were provided by the World Data Center for Paleoclimatology. Solar proton fluxes with energies ≥10 MeV were taken from several sources: (1) historical reconstructions of large solar proton events before 1950, (2) published data on solar proton fluxes and (3) satellite data on solar proton events. Time series were analyzed using Statistica and Microsoft Excel software. The fastest decrease in geomagnetic field's intensity occurs in West Antarctica where there is also seen the largest increase in surface temperature in the region during the XX th century. Besides that, in Central and East Antarctica there are trends towards decreasing of air temperature and strengthening of geomagnetic field. The concomitance might indicate a link between the geomagnetic field and regional climatic change. We explain it thusly: (i) the geomagnetic field controls the charged particles flux entering the Earth's atmosphere; (ii) the charged particles influence the ozone concentration near tropopause and through this, the temperature and humidity in the upper troposphere-lower stratosphere, (iii) the induced changes in humidity near tropopause have an effect on surface temperature by strengthening or weakening the greenhouse effect. Changes in the geomagnetic field intensity can be one of the factors which shape the temporal and regional variability of surface temperature. Low intensity of the geomagnetic field and the highest speed of its changes in the West Antarctica correspond to the systematically low ozone concentration and increased air humidity near tropopause. The factors cause retention of Earth's longwave radiation in the troposphere due to the greenhouse effect which results in regional warming in the region.

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Coupling between Geomagnetic Field and Earth’s Climate System

Kilifarska¹,

Bakhmutov²,

Melnyk³

2022

Magnetosphere and Solar Winds, Humans and Communication

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The idea about synchronized variations of geomagnetic field and climate appears in the middle of the twentieth century. Among others, one of the main reasons for its unpopularity is the missing mechanism of coupling between magnetic and non-magnetic media. This chapter offers such a mechanism, consisting of a chain of relations transmitting the geomagnetic spatial-temporal variations down to the planetary surface. The first element of this chain is energetic particles propagating in Earth’s atmosphere, whose density and depth of penetration are modulated by geomagnetic field. Thus, the non-dipolar geomagnetic irregularities are projected on the ionization layer in the lower atmosphere (known as Regener-Pfotzer maximum). This unevenly distributed ionization, in certain conditions (i.e. dry atmosphere), acts as a secondary source of ozone near the tropopause. Ozone at this level is of special importance due to its influence on the tropopause temperature and humidity, and consequently on the planetary radiation balance. Hence, the geomagnetic spatial and temporal variations are imprinted down to the surface, impacting the climate system and its regional structures. The chapter provides synthesized information about geomagnetic field variability, particles’ propagation in Earth’s atmosphere, ion-molecular reactions initiating ozone formation in the lower stratosphere, as well as evidence for its covariance with some atmospheric variables.

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The geomagnetic field's imprint on the twentieth century's climate variability

Cited by 3 publications

References 90 publications

Geomagnetic field variations in the past: an introduction

Geomagnetic field variations in the past: an introduction

Interpretation of space-time temperature variations in Antarctica in connection with changes in the geomagnetic field and low stratospheric ozone

Coupling between Geomagnetic Field and Earth’s Climate System

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