Relation between geomagnetic field and climate variability. Part 2: Probable mechanism

Kilifarska, N.; Bakhmutov, V.; Melnik, G.

doi:10.24028/gzh.0203-3100.v37i5.2015.111146

Cited by 2 publications

(3 citation statements)

References 45 publications

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“…Additional supporting evidence includes the revealed correlations of the GCR and SP with ozone concentration (Fig. 3), and the found higher ozone concentration and lower humidity at the level of upper troposphere-lower stratosphere over the East Antarctica compared to the West during the whole of the studied period, 1900 to 2010, and not just in the last 50 years, as we have previously shown (Kilifarska et al, 2016). The proposed mechanism allows to explain the observed asymmetry in the V. Bakhmutov et al: Interpretation of space-time temperature variations in Antarctica Antarctic temperatures which is clearer in the second half of the XX th century.…”

Section: Discussionsupporting

confidence: 83%

“…Some studies also evaluate the changes in the main magnetic field of the Earth whose sources lie in the core and at the core-mantle boundary at the timescale of the first hundreds-dozens of years. One such paper (Campuzano et al, 2018) used an example of analyzing changes in the area of the South Atlantic magnetic anomaly and in the global sea level in the last three hundred years after the long-term trend was discarded, and confirmed a hypothesis on which we had based our previous research Kilifarska et al, , 2016Kilifarska et al, 2020), namely that the geomagnetic field can have an effect on climatic changes but not the other way round.…”

Section: Introductionmentioning

confidence: 60%

“…In this work we continue our lasting search for the connection between the changes in the geomagnetic field and climate Kilifarska et al, , 2016Kilifarska et al, 2020) since the start of the last century and until today, but the object of study here is the Antarctic region. Our aim is to provide an explanation for the empirical material on the problem of the geomagnetic field -climate connection, including, as part of our hypothesis, the regional specifics of change in surface temperature in the Antarctica: the fast growth it shows in the west concurrently with a slower growth and even decrease in the center and in the east.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 83%