Cosmic ray flux variations, modulated by the solar and earth’s magnetic fields, and climate changes. 1. Time interval from the present to 10–12 ka ago (the Holocene Epoch)

Dergachev, V. A.; Dmitriev, P. B.; Raspopov, O.M.; Jungner, H.

doi:10.1134/s0016793206010130

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…These proxy datasets cover the past 11 millennia (see, e.g., Beer, 2000;Solanki et al, 2004;Dergachev et al, 2006). Solar magnetic activity varied dramatically throughout the Holocene, decreasing sometimes to an extremely low level .…”

Section: Introductionmentioning

confidence: 99%

Long-Term Changes in Sunspot Activity, Occurrence of Grand Minima, and Their Future Tendencies

Мордвинов

Kramynin

2010

Sol Phys

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Long-term changes in the magnetic activity of the Sun were studied in terms of the empirical mode decomposition that revealed their essential modes. The occurrence of grand minima was also studied in their relation to long-term changes in sunspot activity throughout the past 11 000 yr. Characteristic timescales of long-term changes in solar activity manifest themselves in the occurrence of grand minima. A quantitative criterion has been defined to identify epochs of grand minima. This criterion reveals the important role of secular and bicentennial activity variations in the occurrence of grand minima and relates their amplitudes with the current activity level, which is variable on a millennial timescale. We have revealed specific patterns in the magnetic activity between successive grand minima which tend to recur approximately every 2300 yr but occasionally alternate with irregular changes. Such intermittent activity behavior indicates low dimensional chaos in the solar dynamo due to the interplay of its dominant modes. The analysis showed that in order to forecast activity level in forthcoming cycles, one should take into account long-term changes in sunspot activity on a ≈2300-yr timescale. The regularities revealed suggest solar activity to decrease in the foreseeable future.

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Section: Introductionmentioning

confidence: 99%

Long-Term Changes in Sunspot Activity, Occurrence of Grand Minima, and Their Future Tendencies

Мордвинов

Kramynin

2010

Sol Phys

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“…129 I released by volcanism likely arrived at the land surface quickly and entered the sediments through rock weathering, which, together with the fission product, might have elevated the 129 I/ 127 I from rock weathering. Temporal records of other cosmogenic nuclides (e.g., 14 C and 10 Be) have suggested geomagnetic field modulation of their production rates (Dergachev et al., 2006; Tang et al., 2019). However, the relatively higher production rates (suggested from varied nuclide concentrations) from ca.…”

Section: Discussionmentioning

confidence: 99%

Climate Control of Iodine Isotopic Composition Evidenced by Argentine Entisols Records

Fan,

Cheng,

Negri

et al. 2024

Geophysical Research Letters

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The long half‐life of 129I makes it useful for dating marine sediments aged 2–90 Ma. However, the lack of initial value dating hinders its application for dating terrestrial sediments. A large scatter of 129I/127I in prenuclear terrestrial samples has been reported; however, the key influencing factors remain unclear. This study presented iodine isotope data from three Argentine Entisol profiles and developed an iodine‐source model to determine the influence of the source on iodine isotopic composition. The temporal patterns demonstrated clear climate modulations in natural terrestrial iodine isotopes over the last ∼15 Kyr. The model identified rock weathering as a major source of iodine in continental sediments. Higher 129I/127I ratios at mid‐high latitudes arise from weak geomagnetic shielding of cosmic rays and thus a high production rate, implying limited meridional diffusion of atmospheric iodine. These findings reveal that environmental factors are significant for constraining the initial value of terrestrial 129I.

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“…The age of the considered ice samples is not more than , E RT k e −Δ ∝ E Δ λ 11 000 years, i.e., the beginning of the Holocene, which is generally characterized by rather stable cli matic conditions (Dergachev et al, 2006). Seasonal or other short term variations in climatic conditions can substantially affect the physicochemical properties of the snow cover; however, these variations are local in depth.…”

Section: Discussionmentioning

confidence: 99%

Radiocarbon in polar ice: The mechanism by which radiocarbon is preserved in firn grains

Nesterenok

Naidenov

2011

Geomagn. Aeron.

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Cosmic ray flux variations, modulated by the solar and earth’s magnetic fields, and climate changes. 1. Time interval from the present to 10–12 ka ago (the Holocene Epoch)

Cited by 12 publications

References 16 publications

Long-Term Changes in Sunspot Activity, Occurrence of Grand Minima, and Their Future Tendencies

Long-Term Changes in Sunspot Activity, Occurrence of Grand Minima, and Their Future Tendencies

Climate Control of Iodine Isotopic Composition Evidenced by Argentine Entisols Records

Radiocarbon in polar ice: The mechanism by which radiocarbon is preserved in firn grains

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