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SUMMARY:Investigation of the chemical composition of bottom sediments Beri
 ng Sea
DTSTART;VALUE=DATE-TIME:20200713T140000Z
DTEND;VALUE=DATE-TIME:20200713T140100Z
DTSTAMP;VALUE=DATE-TIME:20260419T060727Z
UID:indico-contribution-1802@indico.inp.nsk.su
DESCRIPTION:Speakers: Ivan Kirichenko (IGM SB RAS)\nThe chemical compositi
 on of the bottom sediments of Bering Sea (north-west of the Pacific) was m
 easured by method of X-ray fluorescence analysis using synchrotron radiati
 on (SRXRF) at the collective station\, VEPP 3 (Institute of Nuclear Physic
 s\, SB RAS). Column length is 560 cm. The study of the chemical compositio
 n of this column is a continuation of large-scale work aimed at studying t
 he climate of the North Pacific.\nThe aim of the work is to construct seve
 ral climate change schemes for the Bering Sea and the subarctic of the Pac
 ific for the characteristic time slices of the last two glacier-ice cycles
 : the maximum of the last glaciation\, the Marine Isotope Stage 4 (MIS 4)\
 , the maximum of the last interglacial glaciation (MIS 5.5)\, the maximum 
 of the penultimate glaciation (Heinrich event 11\, MIS 6.2) and the warmes
 t possible MIS 6.5. The general characteristic patterns of orbital and mil
 lennial environmental\, climate and ventilation changes in the Bering Sea 
 and the Pacific subarctic that have occurred during global climate change 
 over the last two glaciation-ice cycles (190-0 thousand years ago) will be
  established. Analysis of mutual influence of environment and climate para
 meters between the subarctic of the Pacific Ocean and the Bering Sea over 
 the last 190 thousand years.\nThe experiment is aimed at studying the dist
 ribution of chemical elements\, markers of paleoclimatic changes along the
  core of bottom sediments in order to identify orbital and rapid climate c
 hanges in the last two cycles of glaciation-icing. And also to clarify the
  role of the region in changes in the palaeoceanology of the world's ocean
 s and in the interaction of water and atmosphere that had occurred during 
 orbital and millennial climate changes.\nAs part of the work were obtained
  distributions of chemical elements (from K to Mo for K-series and U\, Th\
 , Pb for L-series) along the column under study in 1 cm steps. The conduct
 ed cluster analysis showed the presence of two large groups of elements. T
 he first one reflects the terrigenous component of the sediment (K\, Rb\, 
 Nb\, Th\, Y\, Zr\, Mo\, Ti\, Fe\, etc.) and the second - biogenic (Ca\, Sr
 \, U\, Ge\, As\, Br). In the Fourier and wavelet spectra of the distributi
 on of the chemical elements were found periodically components comparable 
 with  periods of D-O events.\nThis work was supported of the grant "Intera
 ction of orbital and millennial changes in the environment and hydrology o
 f the Bering Sea and Sub-Arctic\, Pacific Ocean for the last two cycles of
  glaciation and glaciation under global climate variations" № 19-05-0066
 3\n\nhttps://indico.inp.nsk.su/event/24/contributions/1802/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1802/
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