Possible Influence of Jan.-Mar. Sea Ice over the Sea of Okhotsk on Air Temperature in China

AbstractIn the southwestern part of the Sea of Okhotsk off Hokkaido, sea-ice drift characteristics are investigated using the ice and water velocities obtained from a moored upward-looking acoustic Doppler current profiler (ADCP) during the winters of 1999–2001. Using hourly-mean values of these data along with the wind data measured at a nearby coastal station, the wind factor and turning angle of the relative velocity between the ice and water velocities with respect to the wind are calculated assuming free drift under various conditions. Since the simultaneous sea-ice draft data are also available from a moored ice-profiling sonar (IPS), we examine the dependence of drift characteristics on ice thickness for the first time. As ice thickness increases and wind decreases, the wind factor decreases and the turning angle increases, as predicted by the theory of free drift. This study clearly shows the utility of the moored ADCP measurement for studying sea-ice drift, especially with the simultaneous IPS measurement for ice thickness, which cannot be obtained by other methods.

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The Okhotsk tropospheric cyclone and its role in the occurrence of extreme air temperature in January in 1950-2019

Hydrometeorological research and forecasting ◽

10.37162/2618-9631-2021-3-64-79 ◽

2021 ◽

Vol 3 ◽

pp. 64-79

Author(s):

T.A. Shatilina ◽

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G.Sh. Tsitsiashvili ◽

T.V. Radchenkova ◽

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...

Keyword(s):

Air Temperature ◽

Geopotential Height ◽

Sea Of Okhotsk ◽

Small Neighborhood ◽

Surface Air Temperature ◽

Major Axis ◽

Eastern Coast ◽

Study Region ◽

Extreme Surface ◽

The Sea Of Okhotsk

The field of Н500 geopotential height over the central part of the second natural synoptic region in January during 1950–2019 is analysed to determine regime characteristics of the Okhotsk tropospheric cyclone and its role in the formation of air temperature anomalies over the eastern coast of Asia. A mechanism of occurrence of extreme surface air temperatures using this technique is presented. Extremely low air temperature in the area of the minimum and related deep through are formed during the years when the Н500 minimum is localized over the Sea of Okhotsk. A methodology for constructing ellipses approximating the Н500 level lines in a small neighborhood of the Н500 minimum is developed, the ellipse characteristics are calculated, and their relation to the tropospheric cyclone evolution is analysed. The characteristics of the ellipses constructed in the neighborhood of the geopotential height minimum outside the Sea of Okhotsk significantly differ from those of the ellipses over the Sea of Okhotsk. A high compression of the ellipses towards the major axis is reported when the Far Eastern through intensity is reduced. In this case, an outflow of warm oceanic air masses to the Sea of Okhotsk is observed. The location of the Н500 minimum and the characteristics of the ellipses located within the center circle may be used to explain reasons for dramatic changes in air temperature in the study region. Keywords: Оkhotsk tropospheric cyclone, Н500 minima centers, extreme surface air temperature, ellipse characteristics

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Evaluation of the representation of Arctic sea ice in the U.K. Hadley Centre GCM

Annals of Glaciology ◽

10.1017/s0260305500014397 ◽

1997 ◽

Vol 25 ◽

pp. 423-428

Author(s):

Douglas M. Smith ◽

Claire Cooper ◽

Duncan J. Wingham ◽

Seymour W. Laxon

Keyword(s):

Sea Ice ◽

Sea Of Okhotsk ◽

Seasonal Cycle ◽

Arctic Sea Ice ◽

Surface Energy Budget ◽

Sea Surface ◽

Hudson Bay ◽

The Sea Of Okhotsk ◽

Arctic Sea ◽

Hadley Centre

The amount of Arctic sea ice predicted by the Hadley Centre Global Cilimate Model (GCM) is evaluated using 15 years of passive-microwave data. While the Hadley model reproduces the seasonal cycle reasonably well, it underestimates the total area of sea ice by more than 3 × 106km2for most of the year. In the winter months, most of the underestimate in ice area results from the prediction of far too little ice in Hudson Bay and the Sea of Okhotsk, leading to an excess of up to 0.2 PW heat input to the atmosphere from Hudson Bay alone. The surface-energy budget of Hudson Bay is investigated using a mixture of surface observations (POLES), satellite data (ATSR, SSM/I and ISCCP) and output from the Goddard Data Assimilation Office analysis. Flux adjustments of the order of 200 Wm−2, resulting from anomalously high sea-surface temperatures in the Levitus (1982) climatology, are found to be the cause of the model’s underestimation of sea ice in both Hudson Bay and the Sea of Okhotsk. The fact that flux adjustments based on an inaccurate climatology will produce errors, even if the model physics is correct, underlines the need both for improved climatologies and for models accurate enough not to require flux adjustment.

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Estimation of Sea Ice Drift on the Sea of Okhotsk Shelves Based on Satellite Data

Russian Meteorology and Hydrology ◽

10.3103/s1068373918120099 ◽

2018 ◽

Vol 43 (12) ◽

pp. 871-876

Author(s):

V. V. Plotnikov ◽

V. A. Dubina ◽

N. M. Vakul’skaya

Keyword(s):

Sea Ice ◽

Satellite Data ◽

Sea Of Okhotsk ◽

The Sea Of Okhotsk ◽

Ice Drift ◽

Sea Ice Drift

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A Sea Ice Study Using SAR Data in the Sea of Okhotsk

Journal of Geography (Chigaku Zasshi) ◽

10.5026/jgeography.103.6_plate6 ◽

1994 ◽

Vol 103 (6) ◽

pp. Plate6-Plate8

Author(s):

Hiroyuki WAKABAYASHI ◽

Fumihiko NISHIO ◽

Masaaki AOTA ◽

Shuhei TAKAHASHI

Keyword(s):

Sea Ice ◽

Sea Of Okhotsk ◽

The Sea Of Okhotsk ◽

Sar Data

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Records of sea-ice extent and air temperature at the Sea of Okhotsk from an ice core of Mount Ichinsky, Kamchatka

Annals of Glaciology ◽

10.3189/172756411797252149 ◽

2011 ◽

Vol 52 (58) ◽

pp. 44-50 ◽

Cited By ~ 9

Author(s):

Sumito Matoba ◽

Takayuki Shiraiwa ◽

Akane Tsushima ◽

Hirotaka Sasaki ◽

Yaroslav D. Muravyev

Keyword(s):

Sea Ice ◽

Sea Of Okhotsk ◽

Thermohaline Circulation ◽

Ice Core ◽

Solar Irradiation ◽

Sea Ice Extent ◽

Arctic Oscillation Index ◽

High Productivity ◽

The Sea Of Okhotsk ◽

Ice Production

AbstarctThe Sea of Okhotsk is the southernmost area in the Northern Hemisphere where seasonal sea ice is produced every year. The formation of sea ice drives thermohaline circulation in the Sea of Okhotsk, and this circulation supports the high productivity in the region. However, recent reports have indicated that sea-ice production in the Sea of Okhotsk is decreasing, raising concern that the decreased sea ice will affect not only circulation but also biological productivity in the sea. To reconstruct climatic changes in the Sea of Okhotsk region, we analyzed an ice core obtained from Ichinskaya Sopka (Mount Ichinsky), Kamchatka. We assumed that the remarkable negative peaks of δD in the ice core were caused by expansion of sea ice in the Sea of Okhotsk. Melt feature percentage (MFP), which indicates summer snowmelt, showed high values in the 1950–60s and the mid-1990s–2000s. The high MFP in the 1950–60s was assumed to be caused by an increase in cyclone activity reaching Kamchatka during a negative period of the Pacific Decadal Oscillation index, and that in the 1990–2000s may reflect the increase in solar irradiation during a positive period of the summer Arctic Oscillation index.

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