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40-year changes in temperature and salinity in the southern Sea of Okhotsk: warming of the Soya Warm Current and offshore fresheningNARA Subscribed
This study investigates interannual variations in temperature and salinity in the southern Okhotsk Sea, including the Soya Warm Current (SWC) region, based on observational data over the past 40 years (1984—2023). A key challenge is resolving the strong temperature and salinity front between the SWC and offshore areas to accurately assess interannual variability. To address this, we applied a mapping method (Mensah and Ohshima...
Sediment resuspension and its occurring conditions in the Soya warm current region observed from ADCP backscatter strengthNARA Subscribed
One of the major sources of iron supply to the Okhotsk Sea and the Oyashio region, which both have high biological productivity, is thought to be regions of the East Sakhalin Current and its upstream, originating from the Amur River. This study suggests that the Soya Warm Current (SWC) region could also be a possible source of iron via resuspension of bottom sediments. We derived the volume backscatter strength from acoustic D...
Due to their importance in global ocean ecology and biogeochemistry, much is known about the abundance and diversity of marine microbes and this data informs our studies of microbial genetic variability and niche partitioning. However, much less is known about marine microbes’ vital rates, including phylogenetically-resolved intrinsic growth and mortality. Here, we use cyanobacteria to validate a recently-developed, sequence-b...
A hydrographic section along 55° E, south of 30° S, was visited from December 2019 to January 2020 as the first occupation under the Global Ocean Ship-based Hydrographic Investigations Program. The water column was measured from the sea surface to 10 dbar above the bottom with eddy-resolving station spacings and state-of-the-art accuracy. The upper profile was characterised by a conspicuous front between 42.5 and 43° S and a c...
Sea ice-melt amount estimated from spring hydrography in the Sea of Okhotsk: spatial and interannual variabilitiesNARA Subscribed
This study provides the first estimation of sea ice-melt amount in the Sea of Okhotsk based on spring hydrographic data accumulated for nearly a hundred years. Just after sea ice melts completely, a low-salinity layer appears on the ocean surface, overlying the layer of Winter Water at the freezing point. The integration of the salinity decrease from Winter Water should correspond to the total ice-melt amount. We developed an...
Dense, cold waters formed on Antarctic continental shelves descend along the Antarctic continental margin, where they mix with other Southern Ocean waters to form Antarctic Bottom Water (AABW). AABW then spreads into the deepest parts of all major ocean basins, isolating heat and carbon from the atmosphere for centuries. Despite AABW’s key role in regulating Earth’s climate on long time scales and in recording Southern Ocean c...
This study provides formulae for monthly estimates of the Soya Warm Current (SYC) transport from the sea-level difference (SLD) across the Soya Strait and along the current, and creates a 50-yr data set of the SYC transport. The formulae are based on the dynamical balance both across the strait and along the current by considering the barotropic and baroclinic components. It is suggested that the barotropic and baroclinic comp...
Impact of Access and Benefit Sharing implementation on biological control genetic resourcesNARA Subscribed
The third objective of the Convention on Biological Diversity, the fair and equitable sharing of benefits arising out of the use of genetic resources was further developed when the Nagoya Protocol on Access and Benefit Sharing came into effect in 2014. Interpretation of how this agreement is being implemented is wide-ranging and there are implications for biological control. A survey of biological control workers indicated tha...