Rapid thermohaline transition in the Pacific western subarctic and Oyashio fresh core eddies

Rogachev, K. A.

doi:10.1029/1999jc900330

Cited by 25 publications

(12 citation statements)

References 35 publications

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“…They manifested themselves in the increased level in Petropavlovsk and in a change of a dominant branch of the Oyashio Current (a relative intensification of the coastal Oyashio branch). The thermohaline transition was followed by substantial intensification of the coastal Oyashio branch (an increase in the water transport by a factor of ten in 1994-1997) and a well-pronounced transformation of characteristics of a warm intermediate layer of the Kamchatka Current and Oyashio and a substantial change in eddy sizes near the Bussol Strait [2,8,9].…”

Section: Resultsmentioning

confidence: 99%

The increased radius of the Aleutian eddies and their long-term evolution

Rogachev

Shlyk

2010

Russ. Meteorol. Hydrol.

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The Alaskan Stream south of the Blizhnii Strait disintegrates into mesoscale Aleutian eddies, which provide a westward transport of warm water to the Kamchatka Current and upper Oyashio Current areas. Oceanographic observations from 1949 to 2009 are indicative of a substantial rise of temperature and salinity in the intermediate waters of the Aleutian and Kamchatka currents. A long-term temperature trend in the Aleutian Current in the intermediate layer (at isopicnal of 26.75s q ) amounted to DT = 0.013°C/year. A positive salinity trend was about 0.0014 psu/year. The ocean upperlayer salinity decreased with a rate of -0.0021 psu/year simultaneously with the increase in salinity of the intermediate layer. The decreased salinity of the upper layer and its increase in the intermediate layer result in the intensified halocline. The radius of the Aleutian eddies significantly increased (by 50-100%), which is equivalent, at least, to twofold increase in the volume of the water transported.

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Section: Resultsmentioning

confidence: 99%

The increased radius of the Aleutian eddies and their long-term evolution

Rogachev

Shlyk

2010

Russ. Meteorol. Hydrol.

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“…This core changes gradually its characteristics as the eddy moves northeastward. One of such eddies separated from Kuroshio in 1986 and reached the Bussol' Strait in 1990 [5]. In the Oyashio area near the southern Kuril Islands, this eddy transported northeastward warm and salty water in its core (with temperature of about 5°C, salinity higher than 33.6 psu, and density of 26.6-26.7s q ).…”

Section: Long-term Temperature and Salinity Trend In The Intermediatementioning

confidence: 98%

“…Satellite and oceanographic observations show that the main feature of the Alaskan Stream and the Kamchatka Current are mesoscale eddies. The Kamchatka Current and Oyashio contain different systems of anticyclonic eddies [5,6]. In Oyashio, eddies of the current itself and Kuroshio eddies can be determined according to their origin.…”

Section: Long-term Temperature and Salinity Trend In The Intermediatementioning

confidence: 99%

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Warming of intermediate layers in the upper Oyashio in 1953–2007

Rogachev

Shlyk

2009

Russ. Meteorol. Hydrol.

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Considerable variations in intermediate water characteristics were found in the upper Oyashio based on the oceanographic data from 1953 to 2007. The long-term temperature trend at the 26.75s q isopycnal is 0.03°C/year. This temperature trend is considerably higher than that determined earlier for the Sea of Okhotsk intermediate water and much higher than the World Ocean temperature trend. The westward transport of warm and salty water of the Alaskan Stream is most likely to cause the changes in the Kamchatka Current and upper Oyashio. It is established that Aleutian mesoscale eddies move westward from the location of their formation south of the Blizhniy Strait and transport warm water (3.8-4.2°C) in their core (100-600 m,~26.75s q ). As the trajectory of eddies is quite stable, the westward flow of warm and salty intermediate waters considerably influences the upper Oyashio characteristics. Fig. 1. Region of the study and the scheme of main currents. Rectangular marks the area, for which temperature and salinity anomalies are computed. A is for the Aleutian eddies, K is for the Kamchatka Current eddies, and AKE is for the anticyclonic Kuroshio eddy.

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“…Some may live for years and are able to reach high latitudes (Bogdanov et al, ; Il'iichev et al, ; Lobanov et al, ). For example, the warm‐core ring WCR86 was pinched off from the KE in 1986 at approximately 37°N (Sugimoto et al, ), moved along the Japan and Kuril Trenches and was observed in the area near the Bussol' Strait (46.5°N) in 1990, containing warm salty water in the upper layer even so far from its birth place (Rogachev, ). In spite of winter cooling and freshening of the upper core water while travelling north, the positive heat and salinity anomalies of the Kuroshio rings, compared to the surrounding subarctic water, may be maintained for several years.…”

Section: Introductionmentioning

confidence: 99%

How Eddies Gain, Retain, and Release Water: A Case Study of a Hokkaido Anticyclone

2018

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A Lagrangian methodology is elaborated to identify the origin of water masses in the Kuroshio‐Oyashio frontal zone where waters of the Kuroshio Extension and Oyashio Current and of the Japan and Okhotsk Seas converge. It allows one to track the evolution of mesoscale eddies during the satellite‐altimetry era and to document how they gain, retain, and release water masses of different origin. The methodology is applied to study warm‐core mesoscale anticyclones propagating along the Japan and Kuril Trenches near the eastern coast of Hokkaido Island that have been observed from 1 January 1993 to 10 December 2016 in an altimetry‐based velocity field. The Hokkaido eddy, sampled by profiling floats and a few cruises in 2003 and 2004, is analyzed in detail in order to compare Lagrangian simulation results to observations.

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Rapid thermohaline transition in the Pacific western subarctic and Oyashio fresh core eddies

Cited by 25 publications

References 35 publications

The increased radius of the Aleutian eddies and their long-term evolution

The increased radius of the Aleutian eddies and their long-term evolution

Warming of intermediate layers in the upper Oyashio in 1953–2007

How Eddies Gain, Retain, and Release Water: A Case Study of a Hokkaido Anticyclone

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