Seasonal distribution features of nutrients and DO at 37°N transect

Based on the four cruises carried out at 37°N transect from July 2006 to October 2007 in four seasons.The distribution features of biogenic elements at this section and it's changes were discussed.The results showed that: Influenced by the Huanghai Sea Cold Water Mass and inshore area input, the biogenic elements temperature and salinity have obviously differences at this transect.In summer, the east of this section was controlled by the cold water mass, where had features of lower temperature, higher salinity and higher concentration of biogenic elements.In the west the variation of all factors were more equably.In winter, thermocline faded lead all factors in this transect were vertically uniform.The west had higher concentrations of nutrient elements than that in the east, because of the influence of inshore areas input.In spring, the temperature increased and salinity decreased, while the nutrient elements were consumed, the thermocline and halocline grown up; these were conversely in the autumn.