date: Thu, 31 Oct 1996 18:38:43 from: Andrey.Salamatin@ksu.ru subject: Abstract submission to: mscarlett@peg.apc.org, convnet@peg.apc.org, p.jones@uea.ac.uk IAMAS/IAPSO Secretariat Convention Network 224 Rouse Street Port Melbourne Victoria 3207 AUSTRALIA E-mail: mscarlett@peg.apc.org convnet@peg.apc.org p.jones@east-anglia.ac.uk November 1, 1996 Dear Organizing Committee, Dear Prof. Phil Jones: Please find enclosed into this message a repeatedly sent the Notice of Intention to Attend and the Abstract Submission Form for a presentation at the Symposium JMP17. The file containing the abstract in the Microsoft Word format is also attached. I would be much obliged if the Organizing Committee could respond by a confirmation, confirming that the materials are acceptable for consideration. I would also request to inform me in what way and to what address I could apply for a supporting grant to cover my travel and living expenses to participate in the Symposia. Sincerely Andrey N. Salamatin Professor Kazan State University Russia ********************************************************************** NOTICE OF INTENTION TO ATTEND Professor Surname: SALAMATIN Given Names: ANDREY Organization: Kazan State University Department: Department of Applied Mathematics Position: Professor Address: Kazan State University, 18, Lenin Street, KAZAN State (Republic): Tatarstan, Post Code: 420008, Country: RUSSIA Tel.: (7)(8432)31-84-45, Fax:(7)(8432)38-09-94, 38-74-18 E-mail: Andrey.Salamatin@ksu.ru I am interested in a scientific tour: Seminar on Antarctica & Global Change - Hobart, Tasmania - Australia (13-19 July, 1997) ********************************************************************** ABSTRACT SUBMISSION FORM Page 1 Abstract Title: Temperature Change During the Last Climate Transition in Central Antarctica as Deduced from Borehole Temperature and Isotopic Record at Vostok Station Corresponding Author's Name: Andrey N. Salamatin Contact Address: Kazan State University, 18, Lenin Street City: KAZAN, State(Republic): Tatarstan, Post Code: 420008, Country: RUSSIA, Tel.: (7)(8432)31-84-45, Fax: (7)(8432)38-09-94, 38-74-18 E-mail: Andrey.Salamatin@ksu.ru I would like to present my paper in Symposium: Palaeoclimate in the Southern Hemisphere - JMP17 I would prefer my presentation to be ORAL. ---------------------------------------------------------------------- -- Page 2 Temperature Change During the Last Climate Transition in Central Antarctica as Deduced from Borehole Temperature and Isotopic Record at Vostok Station Andrey N. Salamatin Kazan State University, Kazan, Russia Vladimir Ya. Lipenkov, Nartsiss I. Barkov Arctic and Antarctic Research Institute, St.Petersburg, Russia Temperature measurements in deep boreholes drilled at Vostok Station (East Antarctica) have provided the ice-sheet temperature profile down to a depth of 2700 m. The accuracy of the data is sufficient to analyze perturbations induced by the recent climate history and to calibrate isotopic paleothermometer. A special mathematical model and computer system are developed to infer the main Milankovitch components of temperature climatic oscillations on the glacier surface in the past directly from the temperature - depth curve. The ratio between ice-core deuterium content and cloud temperature fluctuations (at the top of the inversion layer) is also verified by fitting the simulated and measured present-day borehole temperature profiles. It appears that this value may be about 5.8-6.5 permil/C, i.e. approximately 30% lower than the conventional estimate (9 permil/C) derived from the contemporary spatial distribution of isotopes over the Antarctic ice sheet. At the same time it becomes evident that the surface temperatures responsible for the thermal state of the glacier body does not proportionally follow the inversion temperatures. The precession climatic oscillations in the inversion strength undergo additional selective amplification which makes the early Holocene temperatures on the ice- sheet surface warmer and the glacial temperatures lower than it was thought before. To understand this effect one should take into account the fact that the positive difference between the mean annual inversion and surface temperatures is mainly a seasonal (winter) phenomenon. Hence, the relatively high amplitude of the precession component in the surface temperature oscillations in comparison with the one of the inversion temperature may be just a direct consequence of an essentially stronger precession signal in the seasonal temperature response to orbital forcing than in the mean annual temperature variations in the atmosphere for Central Antarctica. The glacial - interglacial temperature increase over Central Antarctica was determined to be about 15C in the ice-sheet surface temperature shifting from -69.6C during the Last Glacial Maximum (20- 22 kyr BP) to -54.6C in the Holocene Optimum (8-10 kyr BP) with the early Holocene temperatures on the surface 3.3C warmer than the present-day level -57.9C. The corresponding increase in the inversion temperature was about 9C. All these estimates are noticeably larger than it has been previously indicated and are much closer to the revised palaeotemperature changes (21-22C) recently reconstructed from the GISP and GRIP ice-core isotope records in Greenland.