sergeogrИзвестия Российской академии наук. Серия географическаяIzvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya2587-55662658-697510.7868/S0373244417030057sergeogr-566Research ArticleЭволюция природных системEvolution of Natural SystemОРБИТАЛЬНАЯ КОРРЕКТИРОВКА ГЕОТЕРМИЧЕСКИХ РЕКОНСТРУКЦИЙ ПАЛЕОКЛИМАТАORBITAL TUNING OF PALEOCLIMATE GEOTHERMAL RECONSTRUCTIONSГорностаеваА. А.GornostaevaA. A.free_ride_@mail.ruАнтипинА. Н.AntipinA. N.free_ride_@mail.ruИнститут геофизики УрО РАН, ЕкатеринбургРоссияInstitute of Geophysics, Urals Branch, Russian Academy of Sciences, YekaterinburgRussian Federation201713062017035864Copyright © Горностаева А.А., Антипин А.Н., 20172017Горностаева А.А., Антипин А.Н.Gornostaeva A.A., Antipin A.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://izvestia.igras.ru/jour/article/view/566

Предложен новый метод повышения точности датировок геотермических реконструкций палеоклимата, основанный на совместной инверсии поверхностных палеотемператур и изменений теплового потока через земную поверхность и сопоставлении последних с вариациями внешнего радиационного воздействия на длинных временных шкалах. Разработанный алгоритм схож с методикой орбитальной подгонки для изотопных температурных хронологий, однако имеет существенное преимущество: для уточнения хронологий палеоклиматических реконструкций сопоставляются две энергетические характеристики, что способствует адекватному учету задержки температурной реакции на изменение внешнего радиационного воздействия. Методика наиболее применима к палеоклиматическим реконструкциям масштаба нескольких десятков тысяч лет. Алгоритм следует применять с осторожностью в районах древних оледенений. Методика реализована на примере реконструированной на Урале температурной истории земной поверхности за последние 35 тыс. лет. Применение орбитальной корректировки геотермических реконструкций позволило достичь корреляции 99% между изменениями теплового потока через земную поверхность и инсоляции в интервале 35–6 тыс. лет назад, оставаясь в рамках естественной изменчивости теплофизических параметров разреза.

A new method is presented to increase the dating accuracy of geothermal paleoclimate reconstructions. The method is based on a simultaneous inversion of surface paleotemperatures and changes of ground surface heat flux, and on a comparison of the latter with external radiative forcing variations on long time scales. The developed algorithm is similar to the method of orbital tuning used for isotope temperature chronologies, but has a substantial advantage: for the revision of reconstructed paleoclimate chronologies, two energy characteristics are compared. It promotes adequate accounting the delay of the temperature reaction to changes in external radiative forcing. The presented method works best for the long-period paleoclimate reconstructions (some tens of thousands of years long). The algorithm should be used carefully for the former glaciation regions. The method was tested using ground surface temperature history reconstructed in the Urals for the past 35 kyr. The applying of the orbital tuning of geothermal paleoclimate reconstructions made it possible to achieve the 99% correlation between the ground surface heat flux and insolation changes in time interval of 35–6 kyr BP staying within the natural variability of the thermophysical properties of the rocks.

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The authors declare that there are no conflicts of interest present.