scholarly journals Atmosphere and Marginal-Sea Interaction Leading to an Interannual Variation in Cold-Air Outbreak Activity over the Japan Sea

2007 ◽  
Vol 20 (23) ◽  
pp. 5707-5714 ◽  
Author(s):  
Atsuhiko Isobe ◽  
Robert C. Beardsley
Keyword(s):  
Interannual Variation ◽  
Japan Sea ◽  
Sea Surface ◽  
Wind Data ◽  
Cold Air ◽  
Cold Air Outbreak ◽  
The Japan Sea ◽  
Wavelet Spectra ◽  
Northern Japan ◽  
Cold Air Outbreaks

Abstract The interannual variation in cold-air outbreak activity over the Japan Sea is investigated using Japan Meteorological Agency buoy 21002 and Quick Scatterometer (QuikSCAT) wind data, Japan Oceanographic Data Center sea surface temperature (SST) data, NCEP–NCAR reanalysis surface wind and sea level pressure (SLP) data, and the winter Arctic Oscillation (AO) index of Thompson and Wallace. Cold-air outbreaks occur during the “winter” November–March period, and wind data for this season for the 19-winter period 1981–2000 were analyzed. Wavelet spectra averaged between 5- and 15-day periods were used to evaluate the intensity of cold-air outbreaks quantitatively. The winter mean wavelet spectra exhibited a clear interannual variation and a significant positive correlation with the AO index, indicating that intensive cold-air outbreaks frequently occur during relatively warm winters caused by a quasi-decadal AO. Based on the SST and SLP data, the low atmospheric surface pressure disturbances tend to develop over the warm East China Sea in warm winters in the positive AO phase. As these low SLP disturbances advance toward the northern Japan islands during the positive AO phase, they intensify more, leading to stronger cold-air outbreaks over the Japan Sea and increased sea surface cooling over the northern Japan Sea.

scholarly journals Structure and Evolution of Misovortices Observed within a Convective Snowband in the Japan Sea Coastal Region during a Cold-Air Outbreak on 31 December 2007

2016 ◽  
Vol 94 (6) ◽  
pp. 507-524 ◽  
Author(s):  
Hanako Y. INOUE ◽  
Kenichi KUSUNOKI ◽  
Ken-ichiro ARAI ◽  
Naoki ISHITSU ◽  
Toru ADACHI ◽  
...  
Keyword(s):  
Coastal Region ◽  
Japan Sea ◽  
Cold Air ◽  
Cold Air Outbreak ◽  
The Japan Sea

scholarly journals Structure of Two Adjacent Shear Lines Accompanied by Wind Gusts in the Japan Sea Coastal Region during a Cold-Air Outbreak on 12 December 2010

SOLA ◽  
2012 ◽  
Vol 8 (0) ◽  
pp. 90-93 ◽  
Author(s):  
Wataru Mashiko ◽  
Hanako Y. Inoue ◽  
Syugo Hayashi ◽  
Kenichi Kusunoki ◽  
Syunsuke Hoshino ◽  
...  
Keyword(s):  
Coastal Region ◽  
Japan Sea ◽  
Cold Air ◽  
Wind Gusts ◽  
Cold Air Outbreak ◽  
The Japan Sea

scholarly journals Doppler Radar Observation of a Tornado Generated Over the Japan Sea Coast during a Cold Air Outbreak

2007 ◽  
Vol 85 (3) ◽  
pp. 321-334 ◽  
Author(s):  
Fumiaki KOBAYASHI ◽  
Yukari SUGIMOTO ◽  
Tomoyuki SUZUKI ◽  
Takeshi MAESAKA ◽  
Qoosaku MOTEKI
Keyword(s):  
Doppler Radar ◽  
Japan Sea ◽  
Radar Observation ◽  
Cold Air ◽  
Cold Air Outbreak ◽  
The Japan Sea ◽  
Sea Coast

The Climatology, Meteorology, and Boundary Layer Structure of Marine Cold Air Outbreaks in Both Hemispheres*

2016 ◽  
Vol 29 (6) ◽  
pp. 1999-2014 ◽  
Author(s):  
Jennifer Fletcher ◽  
Shannon Mason ◽  
Christian Jakob
Keyword(s):  
Boundary Layer ◽  
Layer Structure ◽  
Zonal Flow ◽  
Heat Fluxes ◽  
Pressure Gradients ◽  
Cold Air ◽  
Surface Heat Fluxes ◽  
Cold Air Outbreak ◽  
Wide Range ◽  
Cold Air Outbreaks

Abstract A comparison of marine cold air outbreaks (MCAOs) in the Northern and Southern Hemispheres is presented, with attention to their seasonality, frequency of occurrence, and strength as measured by a cold air outbreak index. When considered on a gridpoint-by-gridpoint basis, MCAOs are more severe and more frequent in the Northern Hemisphere (NH) than the Southern Hemisphere (SH) in winter. However, when MCAOs are viewed as individual events regardless of horizontal extent, they occur more frequently in the SH. This is fundamentally because NH MCAOs are larger and stronger than those in the SH. MCAOs occur throughout the year, but in warm seasons and in the SH they are smaller and weaker than in cold seasons and in the NH. In both hemispheres, strong MCAOs occupy the cold air sector of midlatitude cyclones, which generally appear to be in their growth phase. Weak MCAOs in the SH occur under generally zonal flow with a slight northward component associated with weak zonal pressure gradients, while weak NH MCAOs occur under such a wide range of conditions that no characteristic synoptic pattern emerges from compositing. Strong boundary layer deepening, warming, and moistening occur as a result of the surface heat fluxes within MCAOs.

Glacio-eustatic variability in the sedimentation pattern over northern Japan during the past 600 ka

2020 ◽  
Author(s):  
Sushree Sova Barik ◽  
Raj K. Singh ◽  
Pratik K. Upadhyaya ◽  
Lisantaraj Biswal ◽  
Nishant Vats ◽  
...  
Keyword(s):  
Grain Size ◽  
Energy Condition ◽  
Ice Sheets ◽  
Japan Sea ◽  
Mineral Analysis ◽  
Sedimentation Pattern ◽  
The Past ◽  
The Japan Sea ◽  
Size Data ◽  
Northern Japan

<p>The Japan Sea is a semi-enclosed marginal sea affected by global sea-level fluctuation, expansion of seasonal and permanent sea-ice cover, having a significant influence on the regional climate neighboring Japan Sea. Middle Pleistocene to Holocene sediments of the Integrated Ocean Drilling Program site U1423 situated in the northeastern part of Japan Sea was processed for the grain size analysis, semi-quantitative mineral analysis, and clay mineral analysis to access glacio-eustatic control on sedimentation pattern over Japan Sea during the past 610 ka. The average time resolution per sample is ~10 kyr. The mean grain size data suggest the dominance of silt size fraction over the sand and clay. The end member modeling of grain size data suggests the presence of two different energy conditions that varied with the time and influenced by the glacio-eustatic changes over the Japan Sea. The grain size data are relatively coarser and deposited in the higher energy condition during the glacial periods in comparison to interglacial periods except for MIS 2, 4, and 8. The higher energy condition during the glacial intervals suggesting deposition of grains due to the melting of seasonal/permanent ice sheets in the northern Japan Sea. The eolian dust brought from the Chinese loess deposits are relative finer in size and dominated by a higher proportion of quartz. During the glacial phases, illite and kaolinite (%) show a decreasing trend than the interglacial phases suggesting less terrigenous input. The high illite and decreased smectite (%) during interglacial phases suggest a higher degree of physical weathering. The significant increase in the smectite/(illite+chlorite) ratio suggests a higher degree of chemical weathering of the nearby source area, which varied over time. The overall study suggests the phase-wise variability in the presence of permanent/seasonal ice sheets and East Aian Winter Monsoon strength during the past 600 ka.</p>

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