A History of Physical Oceanographic Research in the Japan/East Sea

Danchenkov, Mikhail; Лобанов, В. Б.; Riser, Stephen C.; Kim, Kuh; Masaki, Takeshi; Yoon, Jong Hwan

doi:10.5670/oceanog.2006.41

Cited by 31 publications

(11 citation statements)

References 22 publications

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“…Danchenkov et al, 2006), and the results were summarized as monographs (Shrenk, 1870(Shrenk, , 1874, identifying two major surface currents in the Japan Sea (the Tsushima Current and the Liman Current). Basin-scale oceanographic surveys, including those for deep waters, by Japanese researchers date from the 1930s (e.g.…”

Section: Water Mass Structure and Timescale Of Abyssal Circulationmentioning

confidence: 99%

The Sea of Japan and Its Unique Chemistry Revealed by Time-Series Observations over the Last 30 Years

Gamo¹,

Nakayama²,

Takahata³

et al. 2014

Monogr. Environ. Earth Planets

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Chemical tracers in seawater, as well as physical parameters such as temperature and salinity, have been measured to better characterize the dynamics of water convection and its spatiotemporal changes in the Sea of Japan (also called the Japan Sea), a semi-closed, hyperoxic marginal sea (maximum depth: ∼3,800 m) in the northwestern corner of the Pacific Ocean. Repeated conductivity, temperature, and depth (CTD) observations and measurements of dissolved oxygen, for more than 30 years, have confirmed that the bottom layer of the Japan Sea, with a thickness of ∼1 km below the boundary at a depth of ∼2,500 m, is characterized by vertical homogeneity with fluctuations of potential temperature and dissolved oxygen of <0.001• C and <0.5 µmol kg −1 , respectively. The timescale of the abyssal circulation in the Japan Sea has been estimated to be 100-300 years, using 14 C and other chemical tracers. Stable isotope analyses for dissolved He, O 2 and CH 4 have given us information on their unique geochemical cycles in the Japan Sea. Profiles of the short-lived radioisotope 222 Rn just above the sea bottom have brought new insights into the short-term lateral water movement with a timescale of several days in the Japan Sea bottom water. It is of special concern that the gradual deoxygenation and warming of the bottom water over the last 30 years have resulted in an ∼10% decrease in dissolved oxygen and ∼0.04• C increase in potential temperature, suggesting a change of the deep convection system in the Japan Sea. The temporal changes in the vertical profiles of tritium from 1984 to 1998 have suggested a shift of the abyssal circulation pattern from a "total (overall) convection mode" to a "shallow (partial) convection mode". It is likely that the global warming since the last century has hindered the formation of dense surface seawater and its ability to sink down to the bottom, isolating the bottom layer from the deep convection loop that is indispensable as the source of cold and oxygen-rich water. However, the decreasing trend of bottom dissolved oxygen between 1977 and 2010 was not monotonous; rather, it was interrupted by an occasional break in the winter of 2000-2001, when severely cold weather may have resulted in especially dense surface water to sink down to the bottom layer for its ventilation.

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Section: Water Mass Structure and Timescale Of Abyssal Circulationmentioning

confidence: 99%

The Sea of Japan and Its Unique Chemistry Revealed by Time-Series Observations over the Last 30 Years

Gamo¹,

Nakayama²,

Takahata³

et al. 2014

Monogr. Environ. Earth Planets

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“…струями течений как с юга и юго-запада, так и с востока, из зоны Цусимского течения у Японских островов (Никитин и др., 2002;Danchenkov et al, 2006;Никитин, Дьяков, 2016), что иллюстрируется схемой, приведенной на рис. 1.…”

Section: изменчивость термохалинной структуры в верхнем слое профилирunclassified

“…С. 188-205 мации, которая охватывает, в основном, приповерхностный слой моря (Гинзбург и др., 1998;Никитин и др., 2002;Danchenkov et al, 2006;Пономарев и др., 2011;Никитин, Дьяков, 2016).…”

Section: Introductionunclassified

Variability of the Thermohaline Structure at the Continental Slope Off the Russian Coast, the Northwestern Japan Sea

Trusenkova

Ostrovskii

Lazaryuk

et al. 2019

JOR

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The study is based on unique data from the autonomous Aqualog profiler installed in the northwestern Japan Sea at the continental slope off the southeastern Primorye coast from April 18 through October 14, 2015. Data set for the 64–300 m depths, with the depth step of 1 m and time step of 6 hours, and the time series averaged for the 320–420 m depths, with the time step of 6 days, are used. Variability in the upper and lower profiled layers is found to be of different nature. Above 100–150 m short-lived (2–4 days) temperature and salinity anomalies are mostly of the same sign. Based on our earlier analysis of satellite information it is possible to link these anomalies with water intrusions of different origins. Conversely, these anomalies are usually of the opposite signs and are longer-lived (up to 10–15 days) in the lower layer which can be explained by vertical displacements of isopycnals, probably due to passing mesoscale and submesoscale disturbances. Based on wavelet transform it is found that the longest-period fluctuations (with the periods of 80–110 days) were the most intense in the entire profiled layer throughout the entire record. Isopycnal displacements with the periods of 80–110 days were also found, being in-phase with the temperature fluctuations. The wavelet transform also revealed that variability strengthened in the upper layer and weakened in the lower layer from mid-August onwards.

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“…Распределение хлорофилла a (мг/м 3 ) в СЗ части Японского моря в видимом диапазоне по данным радиометра GOCI с ИСЗ COMS в 2015 г.: слева -42,25-43,75° с. ш., 130,25-135,5° в. д., справа -42-43,75° с. ш., 130-135,5° в. д.; мыс Поворотный обозначен буквой П Повышенная солёность указывает на то, что профилограф «Аквалог» зарегистрировал трансформированные субтропические воды, так как в субарктической структуре солёность на этих глубинах ниже (Зуенко, 1998; Лучин и др., 2003). На основе анализа многолетних спутниковых данных уже было установлено, что воды южной части Японского моря могут поступать к берегам Приморья как непосредственно с юга (Никитин и др., 2009), так и с востока (Danchenkov et al, 2006) в синоптических вихрях и струях течений. В период летнего муссона 2015 г. часто повторялись сильные восточные и северо-восточные ветры с абсолютной величиной вдольберегового напряжения трения в районе «Аквалога» 2 дин/см 2 и более (см.…”

Section: адвекция тёплых вод к побережью приморьяunclassified

Water exchange off the southern Primorye coast in the Japan Sea from satellite imagery and long-term <i>in situ</i> measurements

Trusenkova¹,

Ostrovskii²,

Lazaryuk³

et al. 2019

Sovr. Probl. DZZ Kosm.

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A History of Physical Oceanographic Research in the Japan/East Sea

Cited by 31 publications

References 22 publications

The Sea of Japan and Its Unique Chemistry Revealed by Time-Series Observations over the Last 30 Years

The Sea of Japan and Its Unique Chemistry Revealed by Time-Series Observations over the Last 30 Years

Variability of the Thermohaline Structure at the Continental Slope Off the Russian Coast, the Northwestern Japan Sea

Water exchange off the southern Primorye coast in the Japan Sea from satellite imagery and long-term <i>in situ</i> measurements

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