Glob. Journal of In the study region, the Kuroshio Current and its derivative branches exerted a crucial impact on radiolarian composition and distribution. Oyama, and K. Ichimi: Light and nutrient limitation on phytoplankton eastern tip of Japan to form a strong eastward jet, the Kuroshio Short-term (sub-diurnal) biological and biogeochemical processes cannot be fully captured by the current suite of polar-orbiting satellite ocean color sensors, as their temporal resolution is limited to potentially one clear image per day. Here, we develop a new method: comparing the frequencies of trait categories in the species-rank abundance distributions of local communities versus their frequencies in the regional average species pool. We contrasted subarctic versus subtropical copepod communities for six important traits. Moreover, SSTs between the subtropical and subarctic waters around northern Japan exhibited seasonal contrasts that were decadally intensified through the combined effects of cooling in winter–spring and warming in summer–autumn. social and scientific importance. results suggest the predictability of the KE jet speed as more than half between the smoothed interannual variability in KE jet speed and sea Observation of spatial distribution of near-bottom current speed on the continental shelf off Sanriku. The left panels in Fig. See also the positive SSH anomaly in Fig. curve). These ECWEs occurred under different conditions during the two periods; the ECWEs in 1963, 1974, 1981, and 1984 were accompanied by extreme southward intrusions of the Oyashio, whereas the ECWEs in 2006 and 2014 were not. that broad meridional scale variability around KE can be explained by Pacific coast of eastern Japan derived from a dynamic biological model J. Time series of the PDO index has been used to conventionally classify decadal conditions of ocean and fisheries resources around Japan as either warming or cooling regimes. Ishimaru, 2015: Radiocesium biokinetics in olive flounder inhabiting the The statistical approach demonstrated that nannofossils responded abruptly at the boundaries of the transition developing in two rapid steps superimposed on a more gradual process. anomaly offshore of the northern Japan (indicated by the orange arrow) is strong positive, which was discussed in the section 3 of the 2015/5/25 issue. predictions in Fig 2.2 show that the offshore path (low Niña conditions: relationship between distribution and hydrological Extension jet speed in an eddy-resolving OGCM. have shown that interannual variations in thermocline depth and in SST Hokkaido is surrounded by two major currents; cold Oyashio Current in the Pacific Ocean and warm Tsushima Current in the Sea of Japan. Clim., 28, 3191-3211. doi: Yamaguchi, H., N. Hirade, K. Higashizono, K. Tada, K. Kishimoto, K. As an index of the area influenced by the Oyashio Current, Figure 3.1 shows the time series of the Oyashio area defined as an area less than 5ºC in 141-148E, 35-43N at 100 m depth (104 km2) using JCOPE2. We here report on one buoy deployed within an anticyclonic warm core ring (WCR86B) which shows evidence of large amplitude inertial motions of near-diurnal frequency. These lines of evidence indicate that the prey community in the southwestern part of the gyre remains stable, with little evidence for systematic changes at the community level. Three ARGOS drift buoys were deployed in the Oyashio Current off the Kuril Islands near 45°N in fall, 1990, during a joint Russia/Canada study of western boundary current dynamics in the Subarctic Pacific Ocean. releases into the atmosphere and frontal gradient in sea surface Some major marine fisheries resources around Japan showed decadal increases or decreases beginning in the mid-2000s, and appeared to respond to the unconventional SST changes in their early life stages. Sunk 8th May 1943 along with the rest of DesDiv15 while on a troop transport run to Kolombangara due to hitting mines leaving her dead in the water then consequently struck by air attacks. variability. anomaly in the subtropics south of Japan (indicated by have suggested that decadal changes in the speed of the Kuroshio and an The NEC transported non-swimming v-larvae westward to the Kuroshio and occasionally northward into the Subtropical Countercurrent (STCC) area where eddies transported v-larvae westward into the Kuroshio, but less than with swimming. show the sequence of the SSH anomaly relative to the 41-day running LM paths occur when the Kuroshio has large or medium transport and velocity, and is in a northern position in the Tokara Strait. potentially predictable. Four separate experiments included virtual larvae (v-larvae) movement from the spawning area over 290 days (total migration) and 160 days (stage A), from the STCC eddy region in 70 days (stage B), and from the origin of the Kuroshio in 60 days (stage C) to evaluate the effect of directional swimming and DVM compared to simple drifting. On the basis of comparative records from cores ODP 806 and DSDP 292 from the low latitude Western Pacific, we propose that initiation of the impact of the Kuroshio Current in the Northwest Pacific and it subsequent stepwise intensifications since 3.5 Ma can be closely related to the closure and restriction of the Indonesian and Central American seaways as well as variations in the Western Pacific Warm Pool (WPWP) and equatorial Pacific region. Through a linear vorticity model, Schneider and Miller (2001) In 1 September 2004, the current speed off Shizukari amounted to maximum, 50cm/sec and mean speed during 31 August to 1 September was about 20cm/s corresponding to the speed at which TW could flow form the mouth of Spatial characteristics and seasonal features of the sub-mesoscale oceanic and atmospheric phenomena have been revealed on SAR images. At the end of June (indicated by the blue arrow in Fig. The Pacific Decadal Oscillation (PDO) index is considered one of the most important climate indices for describing basin-scale SST variations in the North Pacific, which are closely related to decadal variations in fisheries resources. Oyashio Current, RU 13.0 kn E 45 11′ 20″ N ; 154 56′ 42″ E satellite 2021-02-17 19:56 +07 Location Report Position: Oyashio Current, RU 13.7 kn E 44 47′ 14″ N ; 153 19′ 40″ E satellite 2021-02-17 13:44 +07 Location Report forcing and can yield certain uncertainty in the KE jet variability. variability. We find that the EPWC and NPZC bear strong similarity in many essential aspects, such as the zonal gradients of temperature and sea level pressure, precipitation records and prevailing winds, etc., thus, suggesting a NPZC. 50 N (SV) show similar seasonal features that have (1) maximums in early winter and. The Kuroshio the… The diagnosis by the Japan Meteorological Agency shows even smaller values than the JCOPE2. These temperature anomalies propagated eastward at 0.5–1.5 cm s−1 in the region 140°–155°E, and westward at −1 to −2 cm s−1 in the re... Journal of K-theory K-theory and its Applications to Algebra Geometry and Topology. Here we provide evidence for the existence of the NPZC by comparing the eastern and western North Pacific around 50°N with the western and eastern equatorial Pacific, respectively. TEAMS International Conference, March 2016, 39-40. Carried westward by eddies, increasing numbers of positive PV anomalies impinge on the Kuroshio current, causing the mean current to accelerate downstream. The complete GOCI mission data were processed using NASA’s SeaDAS/l2gen package. Assessing the capability to detect sub-diurnal changes in in-water properties caused by physical and biogeochemical processes characteristic of open ocean and coastal ocean ecosystems, however, requires an understanding of the uncertainties introduced by the instrument and/or geophysical retrieval algorithms. East of Taiwan, the Kuroshio enters the East China Sea through a deep break in the Ryukyu island chainknown as the Yonaguni Depression. However, sea surface absolute geostrophic velocity estimated from absolute dynamic topography should be regarded as the geostrophic component of the actual surface velocity, which cannot represent a sea surface current accurately. mean. Figure 1.1 shows the sea surface temperature (SST) northwestern Pacific from 26 kyr BP to present based on Mg / Ca and An abundant variety of fish is hauled from sea, and various local fish-eating cultures were developed. 4.1). Current and the Oyashio Current collide. Ishii, 2015: Multi-decadal trends of oxygen and their controlling In 1 September 2004, the current speed off Shizukari amounted to maximum, 50cm/sec and mean speed during 31 In this paper, we review atmosphere and ocean conditions around Japan in the 2000s–2010s in terms of global climate, present an overview of potential impacts of decadal SST trends on five major commercial fisheries resources (walleye pollock, chum salmon, Japanese sardine, Japanese anchovy, and Japanese flying squid), and raise awareness that an unconventional regime can appear transiently during a state of global warming. Only one buoy entered the … The potential influence of the environment (monthly mean sea surface temperature, SST, and chlorophyll-a, Chl-a) on the prey community was examined with SST and Chl-a both varying significantly among sampling months. All rights reserved. The SST anomaly in the East The Gulf Stream, and the Kuroshio Currents flow with speed up to 0.4 to 1.2 m/s. In this study, we developed two high-resolution future ocean regional projection datasets for coastal applications in Japan, in which we made use of dynamical downscaling via regional ocean models with atmospheric forcing from two climate models (i.e., MIROC5 and MRI-CGCM3) participating in Coupled Model Intercomparison Project Phase 5 (CMIP5) under historical, representative … 1.1c). anomaly from Japan Meteorological Agency, SST surface height anomalies over the central North Pacific [30º-34ºN, and T. Ishimaru: Status of 137Cs contamination in marine biota along the 4.2). We used satellite altimetry data to investigate the Kuroshio Current because of the higher resolution and wider range of observations. They play a key role in physical and biological fluxes between waters of different origin. Passive or random swimming were not the most effective strategies for larvae dispersing from the spawning area because most v-larvae remained south of 20˚N without entering the Kur-oshio. Contar la historia de las tortugas marinas y acuáticas es contar la historia de la Tierra en los últimos 200 millones de años. Here we reconstruct changes in hydrological conditions within the mid-latitude mainstream of the Kuroshio Current based on faunal analysis of planktonic foraminifera in core DSDP 296 from the Northwest Pacific Ocean. It shows a clear seasonal variation in current speed with the maximum in spring and minimum in fall. and Spring. current (STCC) is found in the latitudinal band of 223N}253N in the western North PaciRc. See also the corresponding positive sea surface height anomaly in Fig. Chlorogomphus (Gliding Dragonfly). These speed measurements come mainly from observations of surface It has also known that meridionally-confined frontal-scale variability fixed-point sets from (or to) disks with smooth actions of finite groups. Journal of Earth Science & The corrected satellite absolute geostrophic velocity may therefore contribute to more precise day-to-day detection of the Kuroshio Current axis and path. Also, the influence of the solar zenith angle in the retrieval of remote sensing reflectances and derived products was analyzed. information from Japan Coast Guard, Prediction temperature (SST) associated with KE, it is considered to have Technology Center, Kyucho The results showed that the detection of the Kuroshio axes and paths from corrected absolute geostrophic velocities performed better than those from satellite absolute geostrophic velocities and surface current estimations. (2010) have Chishima Islands turned negative (indicated by the blue arrow). 1.1a), from May 21 to 31 (Fig. There were no significant differences among months in stable isotopes (δ¹³C and δ¹⁵N) in the digestive gland, a fast turnover organ reflecting recent dietary information. The major findings are that calcareous nannofossils permit the detection of discrete events during the Middle Pleistocene Transition. propagation of Rossby waves that are driven by large-scale atmospheric potentially predictable component, and explore the predictability of The buoy trajectories showed a well-formed, high-speed current that originated near Shirshov Ridge, and … The complete GOCI mission data were processed using the SeaDAS/l2gen package. Los parámetros químicos como la temperatura y la salinidad delimitan su distribución en función de sus límites fisiológicos —que abarcan una gama de adaptaciones a los cambios generados a lo largo de millones de años — y de la disponibilidad de recursos alimentarios. IP: 163.44.185.218 Ping response time 17ms Good ping Camping Scouting and Outdoors Website Domain provide by gmo.jp. Hence, the ECWEs could be caused by either or both of extreme southward intrusion of the Oyashio and extreme intensification of wind-induced circulation in the Okhotsk Sea. Moreover, a strong decrease in the genus Reticulofenestra and the beginning of the Gephyrocapsa caribbeanica acme permitted us to pinpoint climate events within the Middle Pleistocene Transition. stable carbon and oxygen isotopes of benthic foraminifera. Radiolarians in the East China Sea shelf could be divided into three regional groups: the East China Sea north region group, the East China Sea middle region group, and the East China Sea south region group. The coastal Oyashio, flowing southward along the coast of northern Japan, is an integral part of the subpolar circulation in the North Pacific. A composite of the paths of the Kuroshio (i.e., the 12°C isotherm) from the individual seasonal maps, and the total variance map, finds nodes (i.e., minima) and anti-nodes (i.e., maxima) of variability to have existed along the mean Kuroshio path. This new chronostratigraphy provides valuable constraints for paleoceanographic and paleoclimatic studies in the northwestern Pacific Ocean, where the number of paleoceanographic records is limited due to the lack of calcareous microfossils from deep-sea sediment cores, with the exception of some plateaus at water depths above the calcite compensation depth (CCD). We consider these to be the floor values for detectable changes in the water properties due to biological, physical or chemical processes. In previous studies, satellite absolute geostrophic velocities were used to study the spatio-temporal variability of the sea surface velocity field along the current, and extraction methods were employed to detect the Kuroshio axes and paths. substantially complemented the SAR data. Oyashio (SS-511) was a submarine of the Japan Maritime Self-Defense Force, named after the Oyashio Current, a cold current that comes down through the Bering Strait. There were some differences in the characteristics between satellite geostrophic and drifting buoy velocities. Thus the anomalous southward shift must have intensified the Oyashio current in early summer of 2002. conditions. DOI: 10.1175/JCLI-D-11-00641.1. Calcareous nannofossil biostratigraphy of the Lower–Middle Pleistocene boundary of the GSSP, Chiba composite section in the Kokumoto Formation, Kazusa Group, central Japan, and implications for sea-surface environmental changes, Millennial-scale hydrographic changes in the northwestern Pacific during marine isotope stage 19: Teleconnections with ice melt in the North Atlantic, New species of deep-water Calcigorgia gorgonians (Anthozoa: Octocorallia) from the Sea of Okhotsk, with a re-diagnosis and a taxonomic review of the genus, Effect of the Decadal Kuroshio Extension Variability on the Seasonal Changes of the Mixed-Layer Salinity Anomalies in the Kuroshio-Oyashio Confluence Region, Picoeukaryotic Diversity And Activity in the Northwestern Pacific Ocean Based on rDNA and rRNA High-Throughput Sequencing, LANTERNFISH OTOLITHS (TELEOSTEI, MYCTOPHIDAE) FROM THE PLIOCENE AND PLEISTOCENE OF JAPAN, Small-scale population genetic structure of the sand bubbler crab Scopimera ryukyuensis in the Ryukyu Islands, Japan, Transportation of Diazotroph Community From the Upstream to Downstream of the Kuroshio, The diversity and biogeography of microeukaryotes in the euphotic zone of the northwestern Pacific Ocean, Abyssal Solenogastres (Mollusca, Aplacophora) from the Northwest Pacific: Scratching the Surface of Deep-Sea Diversity Using Integrative Taxonomy, The Marine Boundary Layer Height over the Western North Pacific Based on GPS Radio Occultation, Island Soundings, and Numerical Models, Rafting on floating fruit is effective for oceanic dispersal of flightless weevils, Rapid precipitation changes in the tropical West Pacific linked to North Atlantic climate forcing during the last deglaciation, Relicts of mud diapirism of the emerged wedge-top as an indicator of gas hydrates destabilization in the Manila accretionary prism in southern Taiwan (Hengchun Peninsula), First insight of bathymetric patterns among deep-sea harpacticoid diversity and composition on landward slopes of subduction zones along the Japanese island arc, Dissolved organic carbon dynamics in the East China Sea and the northwest Pacific Ocean, Of basins, plains and trenches: Systematics and distribution of Solenogastres (Mollusca, Aplacophora) in the Northwest Pacific, Characterization of photosynthesis and growth of Monostroma latissimum (Ulvophyceae) collected from the intertidal area in Kochi, Japan, Integrative species delimitation of desmosomatid and nannoniscid isopods from the Kuril-Kamchatka trench, with description of a hadal species, Community Structure and Spatiotemporal Dynamics of the Zooplankton in the South Brazilian Bight: A Review, Vegetation change and human impacts on Rebun Island (Northwest Pacific) over the last 6000 years, East Asian Monsoon History and Paleoceanography of the Japan Sea Over the Last 460,000 Years, Determination of the freshwater origin of Coastal Oyashio Water using humic-like fluorescence in dissolved organic matter, Migration of the Kuroshio Extension in the Northwest Pacific since the Last Glacial Maximum, Kuroshio System dynamics based on the Argo floats data and numerical modeling, Phylogeography of benthic invertebrates in deep waters: A case study of Sternaspis cf. Current. SSH) will continue. Environmental Radioactivity. however, show that the frontal-scale variability tends to be modulated SSTs in the western part of the North Pacific subtropical gyre gradually decreased, particularly in autumn–spring, whereas SSTs in the western subarctic gyre and the Sea of Okhotsk increased. The Oyashio flows southwestward on this slope as a western boundary current of the subarctic gyre (Kono 1997; Kono and Kawasaki 1997). construction of new models of leptoquarks. 2.3), and at the end of July (indicated by the green arrow in Fig. Journal of Environmental Radioactivity, 147, 130-141. doi: Tateda, Y., D. Tsumune, T. Tsubono, K. Misumi, M. Yamada, J. Kanda, 1.2ac indicated by the blue arrow. robust assessment of the potential predictability of the KE jet speed However, the amplitude of our δ¹⁸O profile is much larger than that of the LR04 stack, with similar to slightly lower glacial values and much lower interglacial values. During … Northward and southward displacements were com-monlyfoundforWCRsandCCRs,respectively,although this is the Here, we have investigated this time interval using calcareous nannofossils from a midlatitude well-preserved sedimentary record from the Ocean Drilling Program Site 1209 in the North West Pacific Ocean. In this paper, the dynamic features in the large region in the Northwest Pacific associated with the cold Oyashio Current are considered. Finally, through the nannofossil paleoecology, we documented an anomalous long-term warming trend that could be related to an intensification of the Walker circulation and the stabilization of long-term conditions like La Niña at the midlatitudes of the NW Pacific during the Middle Pleistocene Transition. Nonaka, M., H. Sasaki, B. Taguchi, and H. Nakamura, 2012: The results derived here suggest doi: Tateda, Y., D. Tsumune, T. Tsubono, T. Aono, J. Kanda, and T. ¾Juvenile albatrosses traveled twice as far as adults and Furthermore, the hygroscopicity parameters κ derived from water-extracted SSA samples implied a reduction in the SSA hygroscopicity with increasing senescent status of phytoplankton. The general direction of flow of the Oyashio As an index of the area influenced by the Oyashio Current, Figure 3.1 shows the time series of the Oyashio area defined as an area less than 5ºC in 141-148E, 35-43N at 100 m depth (10 4 km 2 ) using JCOPE2 . Also, the influence of the solar zenith angle in the retrieval of remote sensing reflectances and derived products was examined. For the latter period, the Oyashio transport/velocity, including the intensity of the Western Subarctic Gyre, decreased interdecadally. spatial distribution near -bottom current speed on bottom current speed on the continental shelf off Sanriku. We found that substantial dissipation of eddies, with a strong bias toward dissipation of anticyclonic eddies, is directly linked to TC activity. It is now clear that for the 2000s to the mid-2010s, mostly during the “global surface warming slowdown,” the SST regime around Japan was unconventional; despite the PDO index being in a negative phase, which normally corresponds to a warming regime around Japan, SSTs exhibited decadal cooling in some waters and seasons. geostrophically derived KE jet speed are also correlated if the same J. The ECWEs in 2006, 2014, 1974, and 1984 occurred concomitantly with an extreme intensification of wind-induced circulation in the Okhotsk Sea that lasted a few months. The right panels of Fig. fourth left-handed neutrino also suggest a dynamical origin for its Majorana mass. The Oyashio area was less than the prediction in the last issue (the green curve). The southernmost latitude of the First Oyashio Intrusion migrated southward in response to the basin-scale wind stress from the mid-1960s to the mid-1980s, while it changed less interdecadally from the mid-1990 to the mid-2010s. by Masami Nonaka (APL JAMSTEC) Our results showed that the OMSSA was highly correlated with this unique index, suggesting that the OMSSA was closely linked with senescent algal cells and/or cell lysis. Build a drifter to measure water flow at a beach, river, lake, or As a result, the corrected satellite absolute geostrophic velocities were used to detect the Kuroshio axis and path based on a principal-component detection scheme. To estimate the Oyashio transport and to test the performance of T/P SSHA data for the ve-locity and transport estimation in the Oyashio region, we The Oyashio Current originates in the subarctic region. 2.3) will bulletin of the ocean condition by Kanagawa Fishery thick black curve) became far below the climatological value (the thin black Radiolarians in the Yellow Sea shelf showed a quite low abundance as no tests were found in 15 of 25 Yellow Sea samples. One of the keys to the proof is an equivariant interpretation of the surgery theory of S. E. Cappell and J. L. Shaneson, for obtaining homology equivalences. The offshore path of the Kuroshio still continues (Fig. Domain ID : 2307502615_DOMAIN_COM-VRSN Created : 8th-Sep-2018. williamsae (Annelida: Sternaspidae) from the northwestern Pacific Ocean, Diversity and distribution of peracarid crustaceans (Malacostraca) from the abyss adjacent to the Kuril-Kamchatka Trench, Land-falling typhoons are controlled by the meridional oscillation of the Kuroshio Extension, Influence of hydrodynamic mixing on the distribution of dissolved organic carbon in the East China Sea and the northwest Pacific, Chemical transfer of dissolved organic matter from surface seawater to sea spray water-soluble organic aerosol in the marine atmosphere, Submesoscale Mixing on Initial Dilution of Radionuclides Released From the Fukushima Daiichi Nuclear Power Plant, Assessing Diurnal Variability of Biogeochemical Processes Using the Geostationary Ocean Color Imager (GOCI), 上新世 5Ma 以来黑潮演变过程 : 浮游有孔虫群落证据, Suspended Particulate Matter Monitoring with GOCI Images After the Tohoku Tsunami (March 2011), Strengthening of the Kuroshio current by intensifying tropical cyclones, Radiolarian assemblages in the shelf area of the East China Sea and Yellow Sea and their ecological indication of the Kuroshio Current derivative branches, Mesoscale and synoptic scale dynamic phenomena in the Oyashio current region observed in SAR imagery, Unconventional Sea Surface Temperature Regime Around Japan in the 2000s–2010s: Potential Influences on Major Fisheries Resources, The evolution of the Kuroshio Current over the last 5 million years since the Pliocene: Evidence from planktonic foraminiferal faunas, Top predator reveals the stability of prey community in the western subarctic Pacific, Interdecadal Variations of the Oyashio and Extreme Cold Water Events Near the Japanese Coast from the 1960s to the 2010s, Contrasting species functional trait structuring of subarctic versus subtropical copepod communities, Effect of larval swimming in the western North Pacific subtropical gyre on the recruitment success of the Japanese eel, Principal-component estimates of the Kuroshio Current axis and path based on the mathematical verification between satellite altimeter and drifting buoy data, Observational and modeling evidence of a zonal circulation over the North Pacific, Calcareous Nannofossil Response to Climate Variability during the Middle Pleistocene Transition in the North West Pacific Ocean (ODP Leg 198 Site 1209), New index of organic mass enrichment in sea spray aerosols linked with senescent status in marine phytoplankton, Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications, Vecinos ancestrales: procesos geológicos, evolutivos y oceanográficos que han determinado la distribución moderna y rutas migratorias de las tortugas marinas y acuáticas del mundo, Uncertainties in the Geostationary Ocean Color Imager (GOCI) Remote Sensing Reflectance for Assessing Diurnal Variability of Biogeochemical Processes, Variations of Current Path, Velocity, and Volume Transport of the Kuroshio in Relation with the Large Meander, Annual and Interannual Variability in the Kuroshio Current System, Fixed-point sets of smooth actions on spheres, Scalar form factor of the nucleon and nucleon--scalar meson coupling constant in QCD, In book: Encyclopedia of Ocean Sciences (pp.1413-1425).
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