TY - JOUR
T1 - Structure of Horizontal Turbulence in the Japan Sea
AU - Toba, Y.
AU - Kawamura, H.
AU - Yamashita, F.
AU - Hanawa, K.
N1 - Funding Information:
ACKNOWLEDGMENTS The original satellite data of NOAA-7 was provided by the Meteorological Satellite Center of the Japan Meteorological Agency. The authors express sincere thanks to both NOAA, USA and the Meteorological Satellite Center of Japan, for providing the extremely useful original data used in the present study. The authors also express many thanks to Dr. S. Imawaki and Professor K. Takano for their courtesy of providing the original data of Imawaki and Takano (1982), to Professors T. Nemoto, M. Horikoshi, Dr. T. Sugimoto, as well as the officers and the crew of R.V. Hakuho-Maru, of the Ocean Research Institute, University of Tokyo, for their affording full facilities for the observation in the cruise KH-82-2, to Mrs. Cynthia Jones for correction of English sentences, and to Miss Yoko Inohana for her assistance i n preparing the paper. This study was partly supported by the Grant-in-Aid for Scientific Research by the Ministry of Education, Science and Culture, Project No. 57109008. The processing of data and images was performed at the Computer Center o f Tohoku University.
PY - 1984
Y1 - 1984
N2 - AVHRR images from the U.S. satellite NOAA-7 on May 18, 1982 showed the flow structure in the Japan Sea including the Tsushima Warm Current. There are many eddies which have the characteristics of horizontal turbulence with a structure like the bands of a spiral nebula. The high resolution wave-number spectrum of the sea surface temperature shows a well-defined peak at about 100 km corresponding to the size of the eddies, and a secondary peak at about 15 km corresponding to their banded structure. The spectrum has a slope proportional to k-3 in a range of wave numbers somewhat lower than the first peak, and the one of k-5/3 in wave numbers higher than the secondary peak. The latter range is now called a "pseudo three-dimensional range". A combination of the scale of the eddies with their known velocities gives the horizontal eddy diffusivity of 1.5 × 104 m2s-1 for the southern part and 5 × 103 m2s-1 for the northern part of the Japan Sea. The magnitude of the heat convergence in the Japan Sea, estimated by Kato and Asai (1983) in relation to the study of the air-sea heat exchange, can be explained by these values of the eddy diffusivity combined with the average temperature distribution. Temperature sections suggest a possible effect of the bottom topography through the eddies on the flow structure.
AB - AVHRR images from the U.S. satellite NOAA-7 on May 18, 1982 showed the flow structure in the Japan Sea including the Tsushima Warm Current. There are many eddies which have the characteristics of horizontal turbulence with a structure like the bands of a spiral nebula. The high resolution wave-number spectrum of the sea surface temperature shows a well-defined peak at about 100 km corresponding to the size of the eddies, and a secondary peak at about 15 km corresponding to their banded structure. The spectrum has a slope proportional to k-3 in a range of wave numbers somewhat lower than the first peak, and the one of k-5/3 in wave numbers higher than the secondary peak. The latter range is now called a "pseudo three-dimensional range". A combination of the scale of the eddies with their known velocities gives the horizontal eddy diffusivity of 1.5 × 104 m2s-1 for the southern part and 5 × 103 m2s-1 for the northern part of the Japan Sea. The magnitude of the heat convergence in the Japan Sea, estimated by Kato and Asai (1983) in relation to the study of the air-sea heat exchange, can be explained by these values of the eddy diffusivity combined with the average temperature distribution. Temperature sections suggest a possible effect of the bottom topography through the eddies on the flow structure.
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U2 - 10.1016/S0422-9894(08)70309-X
DO - 10.1016/S0422-9894(08)70309-X
M3 - Article
AN - SCOPUS:77956832936
VL - 39
SP - 317
EP - 332
JO - Elsevier Oceanography Series
JF - Elsevier Oceanography Series
SN - 0422-9894
IS - C
ER -