Origin of the climatic cycles from orbital to sub-annual scales

Stoykova, D.; Shopov, Y.; Garbeva, D.; Tsankov, L.; Yonge, Charles J.

doi:10.1016/j.jastp.2007.08.018

Cited by 10 publications

(15 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is demonstrated in Table 1. Here we calculated cycles in the record of the intensity of geomagnetic dipole moment during the last 80 000 years [20] and in a long record of the solar irradiance [13], which is completely independent on the geomagnetic field [21,22]. All cycles of geomagnetic field exist also in variations of the solar irradiance (Table 1) which demonstrates their solar origin.…”

Section: Figurementioning

confidence: 92%

See 1 more Smart Citation

Cycles of the Solar Wind Flux at the Front of the Earth’s Magnetosphere

Shopov¹,

Stoykova²

2011

AIP Conference Proceedings

View full text Add to dashboard Cite

We studied various long solar wind proxy records in order to reveal prolonged solar wind cycles. Inverted rate of atmospheric 14 C production as derived from the standard radiocarbon calibration curve represents good proxy record of the past variations of the solar wind flux at the upper atmosphere because it modulates the galactic cosmic rays flux, which produces the radiocarbon there. We made periodogramme time series analysis of the inverted rate of atmospheric 14 C production record in order to obtain the solar wind cycles. In such a way, we found cycles of 11 500, 1670, 1420, 1280, 924, 835, 787, 750, 663, 610, and 545 years in this solar wind proxy record.Records of the intensity of the geomagnetic dipole are also proxy records of variations of the solar wind flux, because it modulates the geomagnetic field. We made periodogramme time series analysis of the one long record of the intensity of the geomagnetic dipole in order to obtain the solar wind cycles. In this way we found cycles of 11 500, and 835 yrs in this solar wind proxy record. We have confirmed the solar origin of all this cycles by their detection in an independent solar luminosity proxy record.The 11 500-yr cycle was found previously to be the most intensive cycle in the 14 C calibration record and was interpreted to be of geomagnetic origin. Our studies suggest that this is a solar cycle modulating the geomagnetic field. We determined the solar origin of strong cycles with duration of 11 500, and 538 years and of many weak cycles with duration from one to five centuries. This was achieved by their detection in proxy records of solar luminosity, atmospheric 14 C production and the intensity of the geomagnetic dipole. The main variations in the last two records are known to be produced by the solar wind while the first record is absolutely independent on the geomagnetic field, so non of these cycles can be of terrestrial origin.The main variations in the 14 C and geomagnetic field records are produced by the solar wind. Known decadal and even centennial solar cycles have negligible intensity (100 times less intensive) relative to these cycles. These millennial solar luminosity cycles can produce climatic variations with intensity comparable to that of the orbital variations known to produce the glacial periods on Earth.We discovered a sub-annual cycle of 27 days in very high-resolution soil surface temperature proxy records, attributed to solar rotation, which causes the periodic appearance of active zones on the visible solar surface, which are the major emitters of solar wind. Solar wind modulates cosmic ray flux at the Earth, while cosmic rays influence the atmospheric transparency, thus producing a multiplication of solar variations in insolation. Hence small variations of the solar activity can produce a measurable influence on insolation.

show abstract

Section: Figurementioning

confidence: 92%

“…In this work, we use experimental luminescent speleothem proxy records of the solar insolation and solar irradiance, which appear to be most convenient for calculation of prolonged cycles of solar irradiance [13]. Used instruments and their characteristics are described in [14].…”

Section: Proxy Records Of Solar Irradiancementioning

confidence: 99%

Cycles of the Solar Wind Flux at the Front of the Earth’s Magnetosphere

Shopov¹,

Stoykova²

2011

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Our recent studies suggest that this is a solar cycle modulating the geomagnetic field. Stoykova et al [13] determined the solar origin of cycles with durations of 11 500, 4400, 3950, 2770, 2500, 2090, 1960, 1670, 1460, 1280, 1195, 1145, 1034, 935, 835, 750 and 610 yrs. This was achieved by their detection in proxy records of speleothem luminescence [10], 14 C [37] and the intensity of the geomagnetic dipole measured by [38].…”

Section: Past Variations Of the Solar Irradiance And Their Influence mentioning

confidence: 99%

“…Production of the organic acids is determined by variations of the solar irradiance affecting photosynthesis and thermal decomposition of the soil, which is heated by solar radiation [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Solar impact on global climate changes

Shopov¹

2013

AIP Conference Proceedings

View full text Add to dashboard Cite

“…al., 2003;Muscheler et al, 2003). Other cycles sometimes attributed to the Sun (Stoykova et al, 2008) may be ascribed to atmospheric periodicities.…”

Section: Equatorial Featuresmentioning

confidence: 99%

Solar activity and its influence on climate

Jager¹

2008

Netherlands Journal of Geosciences

View full text Add to dashboard Cite

Solar activity, as manifested by its many equatorial as well as high-latitude components of short-term variability is regulated by the Sun’s dynamo. This constitutes an intricate interplay between the solar toroidal and poloidal magnetic field components. The dynamo originates in the tachocline, which is a thin layer situated about 200,000 km beneath the solar surface. The dynamo is a non-linear system with deterministic chaotic elements, hence in principle unpredictable. Yet there are regularities in the past behaviour, such as the Grand Maxima (example: the recent high maximum of the 2nd half of the 20th century) the Grand Minima (e.g. the Maunder Minimum between 1650 and 1710) and the Regular Oscillations such as those between 1730 and 1923. Their occurrences are described by a phase diagram in which a specific point can be identified: the Transition Point. This diagram plays an essential role in determining the future solar activity. Guided by its quasi-regularities and by recent measurements of the solar magnetic fields we find that the Sun is presently undergoing a transition between the past Grand Maximum and a forthcoming period of Regular Oscillations. We forecast that this latter period will start in a few years and will continue for at least one Gleissberg cycle and that the next solar maximum (expected for 2014) will be low (Rmax ~ 68).We discuss the heliospheric drivers of Sun-climate interaction and find that the low-latitude magnetic regions contribute most to tropospheric temperatures but that also the influence of the - so far always neglected - polar activity is significant. Subtraction of these components from the observed temperatures of the past 400 years shows a residual series of relative peaks and dips in the temperature. These tops and lows last for periods of the order of the Gleissberg cycle. One of these is the recent period of global warming, which, from this point of view, is not an exceptional period.

show abstract

Origin of the climatic cycles from orbital to sub-annual scales

Cited by 10 publications

References 29 publications

Cycles of the Solar Wind Flux at the Front of the Earth’s Magnetosphere

Cycles of the Solar Wind Flux at the Front of the Earth’s Magnetosphere

Solar impact on global climate changes

Solar activity and its influence on climate

Contact Info

Product

Resources

About