ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK
Off the coast of Hokkaido in the Sea of Okhotsk, shore-based radars have revealed that an eddy-like pattern (ice-ocean eddy) or backward wave breaking pattern is sometimes observed in the ice floe distribution. A typical ice-ocean eddy is shown in an aerial photograph in the Asahi Shinbun, January 1...
Main Authors: | , , |
---|---|
Format: | Report |
Language: | English |
Published: |
ABSTRACT
1990
|
Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3625 http://id.nii.ac.jp/1291/00003625/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3625&item_no=1&attribute_id=18&file_no=1 |
id |
ftnipr:oai:nipr.repo.nii.ac.jp:00003625 |
---|---|
record_format |
openpolar |
spelling |
ftnipr:oai:nipr.repo.nii.ac.jp:00003625 2023-05-15T18:02:10+02:00 ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK / ワカツチ マサアキ K. I. OHSHIMA Masaaki WAKATSUCHI 1990-01 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3625 http://id.nii.ac.jp/1291/00003625/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3625&item_no=1&attribute_id=18&file_no=1 en eng ABSTRACT Institute of Low Temperature Science, Hokkaido University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3625 http://id.nii.ac.jp/1291/00003625/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 3, 108(1990-01) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3625&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1990 ftnipr 2022-12-10T19:45:46Z Off the coast of Hokkaido in the Sea of Okhotsk, shore-based radars have revealed that an eddy-like pattern (ice-ocean eddy) or backward wave breaking pattern is sometimes observed in the ice floe distribution. A typical ice-ocean eddy is shown in an aerial photograph in the Asahi Shinbun, January 12,1987. It shows that the ice-ocean eddy is composed of numerous pancake ice floes of diameter about 10m. First we investigated the characteristics of these eddies using radar images. These patterns seem to be generated when the ice concentration is small and the wind is weak after strong northerly wind blows. They are mostly observed off the coast of Esashi and Ohmu, near the Soya Strait. They often appear as a vortex train. The scale of the eddies is about 20-30km and the wavelength of the vortex train is about 50km. Next we examine the generation mechanism of these eddies, assuming that sea ice floes act as a tracer for the ocean velocity. The Soya Warm Current which flows in this region is modeled. The model suggests that on this current wave motion is induced by barotropic instability. Using this model, we simulate the behavior of sea ice floes which are driven by wind and oceanic flow. We can reproduce quite similar pattern to observed eddy-like pattern or backward wave breaking pattern. This suggests that the wave motion occurs in the ocean and that the sea ice floes visualize such motion as a tracer. Report Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice National Institute of Polar Research Repository, Japan Okhotsk Pancake ENVELOPE(-55.815,-55.815,52.600,52.600) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Off the coast of Hokkaido in the Sea of Okhotsk, shore-based radars have revealed that an eddy-like pattern (ice-ocean eddy) or backward wave breaking pattern is sometimes observed in the ice floe distribution. A typical ice-ocean eddy is shown in an aerial photograph in the Asahi Shinbun, January 12,1987. It shows that the ice-ocean eddy is composed of numerous pancake ice floes of diameter about 10m. First we investigated the characteristics of these eddies using radar images. These patterns seem to be generated when the ice concentration is small and the wind is weak after strong northerly wind blows. They are mostly observed off the coast of Esashi and Ohmu, near the Soya Strait. They often appear as a vortex train. The scale of the eddies is about 20-30km and the wavelength of the vortex train is about 50km. Next we examine the generation mechanism of these eddies, assuming that sea ice floes act as a tracer for the ocean velocity. The Soya Warm Current which flows in this region is modeled. The model suggests that on this current wave motion is induced by barotropic instability. Using this model, we simulate the behavior of sea ice floes which are driven by wind and oceanic flow. We can reproduce quite similar pattern to observed eddy-like pattern or backward wave breaking pattern. This suggests that the wave motion occurs in the ocean and that the sea ice floes visualize such motion as a tracer. |
format |
Report |
author |
/ ワカツチ マサアキ K. I. OHSHIMA Masaaki WAKATSUCHI |
spellingShingle |
/ ワカツチ マサアキ K. I. OHSHIMA Masaaki WAKATSUCHI ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK |
author_facet |
/ ワカツチ マサアキ K. I. OHSHIMA Masaaki WAKATSUCHI |
author_sort |
/ ワカツチ マサアキ |
title |
ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK |
title_short |
ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK |
title_full |
ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK |
title_fullStr |
ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK |
title_full_unstemmed |
ON GENERATION MECHANISM OF ICE-OCEAN EDDIES OFF HOKKAIDO COAST IN THE SEA OF OKHOTSK |
title_sort |
on generation mechanism of ice-ocean eddies off hokkaido coast in the sea of okhotsk |
publisher |
ABSTRACT |
publishDate |
1990 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3625 http://id.nii.ac.jp/1291/00003625/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3625&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(-55.815,-55.815,52.600,52.600) |
geographic |
Okhotsk Pancake |
geographic_facet |
Okhotsk Pancake |
genre |
Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice |
genre_facet |
Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3625 http://id.nii.ac.jp/1291/00003625/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 3, 108(1990-01) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3625&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766171940388601856 |