Temporal variation of transmission loss by internal tide in the southern sea of Jeju island in summer

2015 ◽  
Vol 138 (3) ◽  
pp. 1930-1930
Author(s):  
Juho Kim ◽  
Hansoo Kim ◽  
Dong-Guk Paeng ◽  
Ig-Chan Pang
Keyword(s):  
Temporal Variation ◽  
Transmission Loss ◽  
Internal Tide ◽  
Jeju Island

Effect of the internal tide on midfrequency transmission loss in the Shallow Water 2006 Experiment.

2009 ◽  
Vol 125 (4) ◽  
pp. 2511-2511
Author(s):  
Jie Yang ◽  
Daniel Rouseff ◽  
Dajun Tang ◽  
Frank S. Henyey
Keyword(s):  
Shallow Water ◽  
Transmission Loss ◽  
Internal Tide

Effect of the Internal Tide on Acoustic Transmission Loss at Midfrequencies

2010 ◽  
Vol 35 (1) ◽  
pp. 3-11 ◽  
Author(s):  
Jie Yang ◽  
D. Rouseff ◽  
Dajun Tang ◽  
F.S. Henyey
Keyword(s):  
Transmission Loss ◽  
Internal Tide ◽  
Acoustic Transmission

scholarly journals STUDY OF TRANSMISSION LOSS VARIATION AFFECTED BY INTERNAL TIDES IN THE SEA AREA NORTHEAST OF TAIWAN

2012 ◽  
Vol 20 (01) ◽  
pp. 1250002
Author(s):  
YUAN-YING CHANG ◽  
CHENG-KEN HUANG ◽  
CHI-FANG CHEN ◽  
SEN JAN
Keyword(s):  
Negative Correlation ◽  
Sound Propagation ◽  
Transmission Loss ◽  
Spring Tide ◽  
Mixing Layer ◽  
Internal Tide ◽  
Internal Tides ◽  
Underwater Sound ◽  
Sea Area ◽  
Tide Period

Internal tides can cause density and sound speed fluctuations in the ocean, and the thickness of the mixing layer can fluctuate in short periods of time. This phenomenon affects underwater sound propagation and induces transmission loss variations. In the sea area northeast of Taiwan, regular internal tide activity is observed. The topography and sediment there are also complex, which makes the effect on transmission loss by internal tides even more complicated. This paper studies how transmission loss variation is affected by internal tides in the sea area northeast of Taiwan. The hydrographic fields with influence from the internal tides are provided by an experiment survey on the 4th of September, 2008 and a 3-D tide model. The transmission loss comparison between different thicknesses of the mixing layer in the internal tide fields is shown. Furthermore, the correlation coefficient is calculated and shows that layer depth and transmission loss have a medium to high negative correlation in the upper water column during the summer spring-tide period, and a low to medium negative correlation during the summer neap-tide period.

scholarly journals Analyzing Spatio-Temporal Variation of Groundwater Recharge in Jeju Island by using a Convolution Method

2014 ◽  
Vol 23 (4) ◽  
pp. 625-635 ◽  
Author(s):  
Kyung-Hee Shin ◽  
Min-Ho Koo ◽  
Il-Moon Chung ◽  
Nam-Won Kim ◽  
Gi-Pyo Kim
Keyword(s):  
Temporal Variation ◽  
Groundwater Recharge ◽  
Jeju Island ◽  
Spatio Temporal ◽  
Convolution Method

scholarly journals Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005

2008 ◽  
Vol 8 (11) ◽  
pp. 2933-2948 ◽  
Author(s):  
M. Kuwata ◽  
Y. Kondo ◽  
Y. Miyazaki ◽  
Y. Komazaki ◽  
J. H. Kim ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Temporal Variation ◽  
Cloud Condensation Nuclei ◽  
Particle Diameter ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Jeju Island ◽  
Chemical Compositions ◽  
Condensation Nuclei ◽  
Soluble Components

Abstract. We measured the number concentrations of cloud condensation nuclei (CCN) and the size distributions of CCN/CN (CN: condensation nuclei) ratios at supersaturations (SSs) of 0.097, 0.27, 0.58, and 0.97% at Jeju Island, Korea during March-April 2005. We made simultaneous measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5. The CCN/CN ratios increased with increasing particle diameter, and the diameter at CCN/CN=0.5 was defined as D50. D50 represents the activation dry diameter of atmospheric particles. The average D50 at SS=0.097% and 0.97% was 136±17 nm and 31±3 nm, respectively. The temporal variation of D50 at SS=0.097% was correlated with the mass fraction of water-soluble components (inorganic ions + WSOC), indicating that the temporal variation of CCN activity was mainly controlled by changes in the water-soluble components fraction. The critical dry diameter (Dcrit), which is the threshold dry diameter for CCN activation, was calculated from the observed aerosol chemical compositions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r2=0.48) with calculated Dcrit, although Dcrit was larger than D50 by 20–29% on average. The systematic difference between D50 and Dcrit could be caused by the size dependence of the aerosol chemical compositions or surface tension lowering caused by the mixing of water-soluble organic compounds. This difference corresponds to a 27±14% uncertainty in the CCN number concentration estimated from the observed particle number size distribution.

scholarly journals Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005

2007 ◽  
Vol 7 (6) ◽  
pp. 15805-15851 ◽  
Author(s):  
M. Kuwata ◽  
Y. Kondo ◽  
Y. Miyazaki ◽  
Y. Komazaki ◽  
J. H. Kim ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Temporal Variation ◽  
Cloud Condensation Nuclei ◽  
Particle Diameter ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Jeju Island ◽  
Chemical Compositions ◽  
Condensation Nuclei ◽  
Soluble Components

Abstract. We measured the number concentrations of cloud condensation nuclei (CCN) and the size distributions of CCN/CN (CN: condensation nuclei) ratios at supersaturations (SSs) of 0.097, 0.27, 0.58, and 0.97% at Jeju-Island, Korea during March-April 2005. Measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5 were simultaneously made. The CCN/CN ratios increased with increasing particle diameter, and the diameter at CCN/CN=0.5 was defined as D50. D50 represents the activation dry diameter of atmospheric particles. The average D50 at SS=0.097% and 0.97% was 136 nm and 31 nm, respectively. The temporal variation of D50 at SS=0.097% was correlated with the mass fraction of water-soluble components (inorganic ions + WSOC), indicating that the temporal variation of CCN activity was mainly controlled by changes in the water-soluble components fraction. The critical dry diameter (Dcrit), which is the threshold dry diameter for CCN activation, was calculated from the observed aerosol chemical compositions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r2=0.48) with calculated Dcrit, although Dcrit were larger than D50 by 20–29% on average. The systematic difference between D50 and Dcrit could be caused by the size dependence of the aerosol chemical compositions or surface tension lowering caused by the mixing of water-soluble organic compounds. This difference corresponds to a 27±14% uncertainty in the CCN number concentration estimated from the observed particle number size distribution.

Seroprevalences ofMycoplasma pneumoniaeIgM Antibodies among Children Living in Jeju Island, Korea

2014 ◽  
Vol 4 (3) ◽  
pp. 146 ◽  
Author(s):  
Kyutaeg Lee ◽  
Woo Jin Kim ◽  
Dong Lyul Kim ◽  
Jae Hyang Kim ◽  
Moo Sang Chong
Keyword(s):  
Jeju Island

Temporal variation in food utilisation by three species of temperate demosponge

2013 ◽  
Vol 485 ◽  
pp. 91-103 ◽  
Author(s):  
A Perea-Blázquez ◽  
SK Davy ◽  
B Magana-Rodríguez ◽  
JJ Bell
Keyword(s):  
Temporal Variation ◽  
Food Utilisation
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