Seasonal Variations of Yellow Sea Fog: Observations and Mechanisms*

Sea fog is frequently observed over the Yellow Sea, with an average of 50 fog days on the Chinese coast during April‐July. The Yellow Sea fog season is characterized by an abrupt onset in April in the southern coast of Shandong Peninsula and an abrupt, basin-wide termination in August. This study investigates the mechanisms for such steplike evolution that is inexplicable from the gradual change in solar radiation. From March to April over the northwestern Yellow Sea, a temperature inversion forms in a layer 100‐350 m above the sea surface, and the prevailing surface winds switch from northwesterly to southerly, both changes that are favorable for advection fog. The land‐sea contrast is the key to these changes. In April, the land warms up much faster than the ocean. The prevailing west-southwesterlies at 925 hPa advect warm continental air to form an inversion over the western Yellow Sea. The land‐sea differential warming also leads to the formation of a shallow anticyclone over the cool Yellow and northern East China Seas in April. The southerlies on the west flank of this anticyclone advect warm and humid air from the south, causing the abrupt fog onset on the Chinese coast. The lack of such warm/moist advection on the east flank of the anticyclone leads to a gradual increase in fog occurrence on the Korean coast. The retreat of Yellow Sea fog is associated with a shift in the prevailing winds from southerly to easterly from July to August. The August wind shift over the Yellow Sea is part of a large-scale change in the East Asian‐western Pacific monsoons, characterized by enhanced convection over the subtropical northwest Pacific and the resultant teleconnection into the midlatitudes, the

[1]  Q. Fangli,et al.  Tidal effects on temperature front in the Yellow Sea , 2004 .

[2]  G. Taylor.  The formation of fog and mist , 2007 .

[3]  T. Yasunari,et al.  Abrupt Seasonal Change of Large-Scale Convective Activity over the Western Pacific in the Northern Summer , 1995 .

[4]  P. Xie,et al.  Global Precipitation: A 17-Year Monthly Analysis Based on Gauge Observations, Satellite Estimates, and Numerical Model Outputs , 1997 .

[5]  Xiaosu Xie,et al.  Atmospheric manifestation of tropical instability wave observed by QuikSCAT and tropical rain measuring mission , 2000 .

[6]  John M. Lewis,et al.  Sea Fog Research in the United Kingdom and United States: A Historical Essay Including Outlook , 2004 .

[7]  Steven J. Worley,et al.  ICOADS release 2.1 data and products , 2005 .

[8]  D. Leipper.  Fog on the U.S. West Coast: A Review , 1994 .

[9]  S. Kobayashi,et al.  The JRA-25 Reanalysis , 2007 .

[10]  Martin W. Johnson,et al.  The oceans : their physics, chemistry, and general biology , 1943 .

[11]  Y. Kosaka,et al.  Structure and dynamics of the summertime Pacific–Japan teleconnection pattern , 2006 .

[12]  Geoffrey Ingram Taylor,et al.  Eddy Motion in the Atmosphere , 1915 .

[13]  Bin Wang,et al.  Global summer monsoon rainy seasons , 2008 .

[14]  Hang Lin,et al.  A heavy sea fog event over the Yellow Sea in March 2005: Analysis and numerical modeling , 2007 .

[15]  S. Xie,et al.  Abrupt onset and slow seasonal evolution of summer monsoon in an idealized GCM simulation , 1999 .

[16]  Darko Koracin,et al.  Transition of Stratus into Fog along the California Coast: Observations and Modeling , 2001 .

[17]  Bing-Jye Wang,et al.  Investigation into extremely acidic hydrothermal fluids off Kueishan Tao, Taiwan, China , 2005 .

[18]  R. Lu.  Convective activities in the tropical western Pacific and their impact on the northern hemisphere summer circulation , 1987 .

[19]  J. M. Lewis,et al.  Sea fog off the California coast: Viewed in the context of transient weather systems , 2003 .

[20]  Yan Du,et al.  Indian Ocean Capacitor Effect on Indo–Western Pacific Climate during the Summer following El Niño , 2009 .

[21]  Hiroshi Ichikawa,et al.  Ocean Frontal Effects on the Vertical Development of Clouds over the Western North Pacific: In Situ and Satellite Observations* , 2009 .

[22]  Hiroaki Ueda,et al.  Important Factors for the Development of the Asian–Northwest Pacific Summer Monsoon* , 2009 .

[23]  W. Timothy Liu,et al.  Progress in Scatterometer Application , 2002 .

[24]  S. Tao,et al.  A review of recent research on the East Asian summer monsoon in China , 1987 .

[25]  T. Tsuyuki,et al.  Development of the Barotropic High around Japan and its Association with Rossby Wave-like Propagatio , 1987 .

[26]  Ren Zhaopeng.  The influence of the thermal effect of underlaying surface on the spring sea fog over the Yellow Sea:Observations and numerical simulations , 2010 .

[27]  D. Cayan,et al.  Variability of Marine Fog Along the California Coast , 1995 .

[28]  J. Doyle,et al.  A Nonhydrostatic Mesoscale Simulation of the 10–11 June 1994 Coastally Trapped Wind Reversal , 1997 .

[29]  Yang-Ki Cho,et al.  Sea Fog around the Korean Peninsula , 2000 .

[30]  Meigen Zhang,et al.  Analysis and high-resolution modeling of a dense sea fog event over the Yellow Sea , 2006 .

[31]  C. W. Rogers,et al.  The Formation of Marine Fog and the Development of Fog-Stratus Systems along the California Coast , 1979 .

[32]  Variations in the lower level of the PBL associated with the Yellow Sea fog-new observations by L-band radar , 2008 .

[33]  B. Xian.  The characteristics of the seasonal variability of the sea surface temperature field in the Bohai Sea, the Huanghai Sea and the East China Sea from AVHRR data , 2002 .

[34]  Bin Wang,et al.  Rainy Season of the Asian-Pacific Summer Monsoon(. , 2002 .

[35]  R.-H. Huang.  Influence of the heat source anomaly over the tropical western Pacific on the subtropical high over East Asia , 1987 .

[36]  J. M. Lewis,et al.  Fog and low clouds in a coastally trapped disturbance , 2005 .

[37]  Wendell A. Nuss,et al.  Observations and Analysis of the 10–11 June 1994 Coastally Trapped Disturbance , 1998 .