The Sea of Okhotsk: A Window on the Ice Age Ocean

2004 ◽  
Vol 51 (4) ◽  
pp. 593-618 ◽  
Author(s):  
James D Hays ◽  
Joseph J Morley
2021 ◽  
Vol 40 (3) ◽  
pp. 85-102
Author(s):  
N.G. Razjigaeva ◽  
◽  
T.A. Grebennikova ◽  
L.A. Ganzey ◽  
V.V. Chakov ◽  
...  

Continued record of paleogeographic events in the Shantar islands since the end of the Pleistocene was restored on the basis of a multy-proxy study of the stratigraphy of the blanket peatland. Biostratigraphical studies included botanical, diatom and pollen analyses. The age-depth model was built using 7 radiocarbon dates. For the first time, data of the environment development were obtained for the coldest part of the Sea of Okhotsk. Synchronicity and metachronicity of paleoclimatic events with regional data and global changes have been established. The Younger Dryas on the Shantar islands was much colder than in other areas around the Sea of Okhotsk. The climate became more maritime after the isolation of the islands at the early-middle Holocene. The influence of the cold sea and the presence of drifting ice were one of the main factors, why the early and middle Holocene optimums were poorly manifested here, and also determined the specifics of climatic rhythm. Models explaining alternation of relatively warm and cold periods with different humidity are proposed. The age of periods with heavy snowfalls has been established, as evidenced by the change in the role of shrub pine in island vegetation. Phases of development of local swamp and zonal landscapes are highlighted. Spruce appeared on the area ~11410–10345 cal. yr. BP, when there was a landbridge, and spruce trees became common in the middle Holocene and especially at the boundary of the middle-late Holocene. One of the controlling factors for the development of swamp landscapes was thermokarst processes. Significant changes in the environment occurred in the Little Ice Age, the most severe conditions were ~500–260 cal. yr. BP. In the last 210 years, the most significant changes in landscapes have been associated with anthropogenic fires.


2003 ◽  
Vol 50 (12) ◽  
pp. 1481-1506 ◽  
Author(s):  
James D Hays ◽  
Joseph J Morley

2018 ◽  
Vol 52 (1) ◽  
pp. 63-73
Author(s):  
N. V. Evseeva

The revision of the herbarium material, collected in the northern part of the Sea of Okhotsk in 1965–1966 and stored in VNIRO, allowed to expand the taxonomic list of macrophyte algae of the coastal zone of this area. The locations of discovery of 24 previously unmentioned species are described. Myrionema balticum, Ulvella repens, Syncoryne reinkei, Acrochaetium arcuatum were found in the Sea of Okhotsk for the first time. Most species new for the Sea of Okhotsk is represented by epiphytes of the family Ulvellaceae (Chlorophyta). The final taxonomic list of this region, including literature data, consists of 169 species.


Author(s):  
Alexandra Romanova ◽  
Alexandra Romanova ◽  
Vladimir Anin ◽  
Vladimir Anin ◽  
Sergey Pletnev ◽  
...  

80 sediment stations collected along the meridian transect across the Sea of Okhotsk were studied in order to reveal patterns of dissolution based on planktonic foraminifera. The degree of calcite dissolution intensity from planktonic foraminifera determined by different indices (degree of fragmentation, presence of susceptible to dissolution species, benthos/ plankton ratio). The highest degree of dissolution evidenced by a large number of shell fragments and corroding walls were found in sediments from the area of the Kuril Islands. The most revealing measure of probable dissolution of foraminiferal shells in the central part of the sea is a low number and lack of thin-walled species. The effects of dissolution on foraminiferal shells were studied for dominated species Neogloboquadrina pachyderma sin and Globigerina bulloides using a scanning electron microscope. The results are important for understanding processes of sedimentation, the paleo-oceanologial reconstructions and for obtaining reliable results in isotope analyzes.


2016 ◽  
Vol 25 (1) ◽  
pp. 13-22
Author(s):  
N.A. Sedova ◽  
S.S. Grigoriev

For the first time the morphology of the decapodid stage of Neocrangon communis is described in detail. The decapodid can be distinguished from those of the genera Argis, Crangon, and Mesocrangon by the morphology of their telson, antennae, antennulae, and carapace. The main distinguishing features of the decapodid of N. communis were two spines on medial line of the carapace, a short rostrum, relatively wide scaphocerite, characteristic shape and length of the terminal setae on the telson. Drawings of general view and some limbs are presented.


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