Prof. Dmitry M. Sonechkin
Prof. Dmitry M. Sonechkin
Shirshov Institute of Oceanology, Russian Academy of Sciences, Russia
Title: Chinese and North-American long-lived conifers reveal millennial variations and several explosive growth events perhaps associated with worldwide environmental catastrophes
Nina M. Datsenko (Hydrometeorological Research Centre of Russia),
Bao Yang, Jingjing Liu and Chun Qin (all from Cold and Arid region environmental study and engineering Institute CAS, Lanzhou, China).

Based on two, Two ~4600 year long dendrochronologies are created based on sets of records of very long-lived (>1000 years) Chinese junipers and American pines. Both dendrochronologies reveal a similar alternation of the increased, decreased, and increased again tree growths during the last millennium. These alternations are fingerprints of the well-known climatic epochs of the Modern Climate Warming, the Little Ice Age and the Medieval Warming as well. 
The main strict peculiarity of both dendrochronologies consists of the existence of two grand minima and two subsequent maxima of the tree growth. One of the maxima is localized near 2000 BD almost at the same time in both dendrochronologies. This maximum is preceded by a tree growth grand minimum near 2300 BD. There are a huge number of evidences in paleoclimatology that there were many catastrophic events in environment at the time of this minimum caused byan explosive eruption of the Hekla volcano in Iceland (Hekla4). This eruption was so powerful that its effects were essential around the world. The tree growth maxima followed after Hekla4 in both dendrochronologies perhaps represent delayed responses of Chinese and American trees to enrichment of the atmosphere by carbon dioxide and of the soil by minerals. 
Time moments of the second grand maximum are essentially different in both dendrochronologies: near 900 BD in the Chinese dendrochronology; and near 1500 BD in the North American one. One may suppose that the very well-known explosive eruption of the Santorin volcano in Mediterrania (near 1100 BD) is the cause of the grand minimum that precedes the maximum of 900 BD in Chinese’s dendrochronology, and the second grand maximum itself (near 1500 BD) is just a delayed tree response to this eruption caused by the same factors that were indicated above (enrichments of the atmosphere by carbon dioxide, and of the soil by minerals). 
As concern the origin of the second pair of minimum/maximum in American’s dendrochronology, one may suppose that an explosive volcano eruption, that took place in Havaii or Alaska, and remains to be undocumented up to now, is the cause of these.

Education (degrees, dates, universities)

        1959 – geophysicist (Geographical Department of the Moscow State University),
        1966 – candidate of physical-mathematical sciences (Computer Hydrometeorological Center of the USSR),
        1991 – doctor of physical-mathematical sciences (Main Geophysical Observatory),
        1993 – full professor of geophysics (Hydrometeorological Research Center of Russia).
Career/Employment (employers, positions and actes)

         1959-1974 – scientist of the Central Institute of Weather Forecasting (Moscow),
         1974-1991 – head of the dynamical-stochastical laboratory of Hydrometeorological Research Center of the                 USSR (Moscow),
         1991- 2005 – head of the dynamical-stochastical laboratory of Hydrometeorological Research Center of              Russia (Moscow).
         2001 – up to now – principal scientist of P.P. Shirshov Oceanology Institute, Russian Academy of Sciences (Moscow).
         2005- up to now – leading scientist (on one half position) of the dynamical-stochastical laboratory of Hydrometeorological Research Center ofRussia (Moscow) (on a half position).

As a professor Sonechkin was a lecturer on satellite meteorology and long-range weather forecasting at the Moscow State University during many years. He delivered lectures on satellite meteorology at the Kiew State University during 1968, and on the climate dynamics at the Pecking and Lanzhou State Universities and Beijing and Nanjing Meteorological Institutes (all in China) during 1993 and 1998. 
In the frame of the Professorships of the internationally recognized scientists of the Chinese Acanemy of Sciences Sonechkin was visiting professor at the Cold and Arid region ebvironmental study and engineering during 2006-2012.

He was a scientific adviser for seven candidate theses.
 Sonechkin was a lecturer at the WMO meetings on satellite meteorology (Moscow, 1966) and on climate diagnostic and forecasting (Nanjing, 1990).