Millennium scale environment changes of the Okhotsk Sea during last 80 kyr and their phase relationship with global climate changes |
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| Authors: | Sergey Alexandrovich Gorbarenko Evgenia L’vovich Goldberg Michaele Kashgarian Tat’yana Alekseevna Velivetskaya Sergey Petrovich Zakharkov Vladimir Stepanovich Pechnikov Alexandr Anatol’evich Bosin Olga Yur’evna Psheneva Elena Diamilevna Ivanova |
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| Institution: | (1) V.I. Il’ichev Pacific Oceanological Institute, Far East Division, Russian Academy of Sciences, Baltiyskaya Str. 43, Vladivostok, 690041, Russia;(2) Limnological Institute, Siberian Branch of Russian Academy of Sciences, Irkutsk, Russia;(3) Center for AMS, Lawrence Livermore National Laboratory, Livermore, CA, 94551, U.S.A.;(4) Far Eastern Geological Institute, Far East Division, Russian Academy of Sciences, Av. 100, Vladivostok, 690022, Russia;(5) Far Eastern State University, Sukhanova Str. 8, Vladivostok, Russia;(6) Pacific Institute of Geography, Far East Division, Russian Academy of Sciences, Radio Str. 7, Vladivostok, 690041, Russia |
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| Abstract: | The paper presents the records of several paleoproductivity proxies (PP) (biogenic opal and Ba (Si_bio, Ba_bio), organic carbon
(C_org) and carbonate Ca_carb, chlorin and benthic foraminifera abundance (BFA)) in sediments of the Okhotsk Sea for the last
80 kyr with a resolution of ∼100–300 years. The sediment age model was based on the AMS 14C data, records of benthic foraminifera δ18O, paleointensity of the Earth’s geomagnetic field and magnetic susceptibility. PP values demonstrate series of severe prolonged
productivity drops in the Okhotsk Sea followed by a sharp increase during the last glaciation. On the basis of quantitative
estimations of the paleoproductivity in the Okhotsk Sea during the cold MIS 2 and warm Holocene (Gorbarenko and Goldberg,
2005), it is suggested that the millennium scale relationship in productivity-climate changes of this basin was similar: an
increase in the sea’s productivity was related with regional climate warming and vice-versa. The PP records of productivity/climate
oscillations in the Okhotsk Sea during MIS 2–4 occurred contemporaneously with the North Atlantic cold Heinrich events (HE)
and Greenland Dansgaard-Oyeshger interstadial (DOI). Observed successions of prolonged climate cooling events followed by
rapid, abrupt warming are similar to climate and environmental oscillations in the N. Atlantic and Greenland, that confirms
the millennium-scale climate changes synchronicities in the Northern Hemisphere including the far NW Pacific, the hydrology
and climate conditions of which are close to those of the Okhotsk Sea. Synchronism of the N. Hemisphere severe cooling (including
the Okhotsk Sea) with the Antarctic warming suggests that mechanisms of the “seesaw” effect (Blunier and Brook, 2001) in the
low latitude heat redistribution between high latitudes of both hemispheres were more complicated than direct NADW formation
forcing and encompasses the global atmospheric reorganization. Within the PP used a closer connection in the Okhotsk Sea millennium
oscillations was observed for the C_org, BFA and chlorin; Ba_bio increases more closely to DOI. Si_bio variability does not
show any evident correlation with productivity changes. |
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| Keywords: | Okhotsk Sea productivity climate millennial scale regional and global changes synchronicity |
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