An exchange flow between the Okhotsk Sea and the North Pacific driven by the East Kamchatka Current

Kida, Sigeo; Qiu, Bo

doi:10.1002/2013jc009464

Cited by 15 publications

(11 citation statements)

References 28 publications

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“…During the spring 2018 dust events, positive CHL-a anomaly areas were distributed around the Kuril Islands (Figure 7c), which are known as the area with strong physical mixing occurring [108][109][110], leading to supply of nutrients to the surface waters for phytoplankton growth. To examine the influence of physical mixing on CHL-a variation in the area, we analyzed non-dust spring 2017 CHL-a and MLD data in the same area represented in the present study (see blue square in Figure 7c, showing AI > 1.7 that indicates the occurrence of a dust event) ( Figure S5).…”

Section: Discussionmentioning

confidence: 99%

Spring 2018 Asian Dust Events: Sources, Transportation, and Potential Biogeochemical Implications

et al. 2019

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The input of aeolian mineral dust to the oceans is regarded as the major source in supplying bioavailable iron for phytoplankton growth. Severe dust events swept over East Asia during the 26 March to the 4 April 2018, decreasing air quality to hazardous levels, with maximum PM10 mass concentrations above 3000 μg m−3 in northern China. Based on a comprehensive approach that combines multiple satellite measurements, ground observations, and model simulation, we revealed that two severe Asian dust events originating from the Taklimakan and Gobi deserts on 26 March and 1 April, were transported through northern China and the East/Japan Sea, to the North Pacific Ocean by westerly wind systems. Transportation pathways dominated by mineral dust aerosols were observed at altitudes of 2–7 km in the source regions, and then ascending to 3–10 km in the North Pacific Ocean, with relatively denser dust plumes within the second dust episode than there were during the first. Our results suggest that mineral dust emitted from the Taklimakan and Gobi deserts could increase ocean primary productivity in the North Pacific Ocean by up to ~50%, compared to average conditions. This emphasizes the potential importance of the deposition of Asian mineral dust over the North Pacific Ocean for enhancing the biological pump.

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Section: Discussionmentioning

confidence: 99%

Spring 2018 Asian Dust Events: Sources, Transportation, and Potential Biogeochemical Implications

et al. 2019

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“…The Sea of Okhotsk is characterized by low temperature and segregated by the Kuril Island chain from the North Pacific Ocean. The Kruzenshtern and Bussol Straits, two major passages in the Kuril Island chain, enable the exchange of flow between the Sea of Okhotsk and the North Pacific Ocean ( Kida and Qiu, 2013 ). Furthermore, the strong mixing of water of the East Kamchatka Current (one branch of the Bering slope current), with water from the Okhotsk Sea at the Bussol Strait, plays a major role in the transformation of the East Kamchatka Current to the Oyashio Current ( Ohtani, 1991 ).…”

Section: Introductionmentioning

confidence: 99%

Metagenomic Insights Into the Microbial Community and Nutrient Cycling in the Western Subarctic Pacific Ocean

Jing

Xia

et al. 2018

Front. Microbiol.

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The composition and metabolic functions of prokaryotic communities in the western subarctic Pacific (WSP), where strong mixing of waters from the Sea of Okhotsk and the East Kamchatka Current result in transfer to the Oyashio Current, were investigated using a shotgun metagenome sequencing approach. Functional metabolic genes related to nutrient cycling of nitrogen, sulfur, carbohydrates, iron and amino acids were differently distributed between the surface and deep waters of the WSP. Genes related to nitrogen metabolism were mainly found in deep waters, where Thaumarchaeaota, Sphingomonadales, and Pseudomonadales were closely associated and performing important roles in ammonia oxidation, assimilatory nitrate reduction, and dissimilatory nitrate reduction processes, respectively. In addition, orders affiliated to Spingobacteria and Alphaproteobacteria were crucial for sulfate reduction and abundant at 3000 m, whereas orders affiliated to Gammaproteobacteria, which harbored the most sulfate reduction genes, were abundant at 1000 m. Additionally, when compared with the East Kamchatka Current, the prokaryotes in the Oyashio Current were likely to consume more energy for synthesizing cellular components. Also, genes encoding iron transport and siderophore biosynthesis proteins were in low abundance, indicating that the iron was not a limiting factor in the Oyashio current. In contrast, in the East Kamchatka Current, prokaryotes were more likely to directly utilize the amino acids and absorb iron from the environment. Overall, our data indicated that the transformation from the East Kamchatka Current to the Oyashio Current reshapes not only the composition of microbial community, but also the function of the metabolic processes. These results extended our knowledge of the microbial composition and potential metabolism in the WSP.

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“…Using Eq. (4), Kida and Qiu (2013) assumed a frictional balance between the stresses exerted by a Throughflow and that by the WBC and showed that the magnitude of the Throughflow transport U scales as…”

Section: A Frictional Balance Around An Islandmentioning

confidence: 99%

“…By applying Eq. (4) for two islands and by assuming the same frictional balance between the flow through the straits and the WBC as in Kida and Qiu (2013), we derive two equations, …”

Section: A Frictional Balance Around An Islandmentioning

confidence: 99%

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The Annual Cycle of the Japan Sea Throughflow

Kida

Qiu

Yang

et al. 2016

Journal of Physical Oceanography

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The mechanism responsible for the annual cycle of the flow through the straits of the Japan Sea is investigated using a two-layer model. Observations show maximum throughflow from summer to fall and minimum in winter, occurring synchronously at the three major straits: Tsushima, Tsugaru, and Soya Straits. This study finds the subpolar winds located to the north of Japan as the leading forcing agent, which first affects the Soya Strait rather than the Tsushima or Tsugaru Straits. The subpolar winds generate baroclinic Kelvin waves along the coastlines of the subpolar gyre, affect the sea surface height at the Soya Strait, and modify the flow through the strait. This causes barotropic adjustment to occur inside the Japan Sea and thus affect the flow at the Tsugaru and Tsushima Straits almost synchronously. The barotropic adjustment mechanism explains well why the observations show a similar annual cycle at the three straits. The annual cycle at the Tsugaru Strait is further shown to be weaker than that in the other two straits based on frictional balance around islands, that is, frictional stresses exerted around an island integrate to zero. In the Tsugaru Strait, the flows induced by the frictional integrals around the northern (Hokkaido) and southern (Honshu) islands are in opposite directions and tend to cancel out. Frictional balance also suggests that the annual cycle at the Tsugaru Strait is likely in phase with that at the Soya Strait because the length scale of the northern island is much shorter than that of the southern island.

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An exchange flow between the Okhotsk Sea and the North Pacific driven by the East Kamchatka Current

Cited by 15 publications

References 28 publications

Spring 2018 Asian Dust Events: Sources, Transportation, and Potential Biogeochemical Implications

Spring 2018 Asian Dust Events: Sources, Transportation, and Potential Biogeochemical Implications

Metagenomic Insights Into the Microbial Community and Nutrient Cycling in the Western Subarctic Pacific Ocean

The Annual Cycle of the Japan Sea Throughflow

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