In paper the ice conditions in the Yellow Sea are estimated on the base of maps of boundaries of ice extending and ice concentration in the period of 1997–2004. The isograms of boundaries of ice extending in the Yellow Sea with probability of 0 %, 25 %, 50 %, 75 % and 100 % were received. The thickness of a fast ice at the end of 1997–2004 winters was calculated by different formulas and satellite maps.
The Yellow Sea is exposed to strong influence of solar radiation. However, the winter northwest monsoon brings cold masses from the central Asia. As a result, the average monthly temperature of air in January in the north of the sea reduces down to –10°C at an absolute minimum down to –30°C. Hence, there the intensive ice formation occurs. That complicates winter navigation, fishing, and also production of mineral resources and hydrocarbons from a seabed.
Literary information about the ice cover of the Yellow Sea practically is absent, and what the available data (Sea Atlas, 1950; Oceanographic Encyclopedia, 1974; Liu The-fu&Li Tong-kui, 2004) have fragmentary nature.
Use of the satellite information of the National Ice Centre of the USA, placed in Internet for period from 1997 till 2004, and also historical information about ice, has allowed to make a series maps (for ten-day periods) of boundaries of ice extending in the Yellow Sea in isograms of probability 0, 25, 50, 75 and 100%. The isograms of boundaries of ice extending in the Yellow Sea with probability of 0 %, 25 %, 50 %, 75 % and 100 % were received on the base of statistical methods of computer processing of data for ice season in the 1997–2004 periods.