In the present dissertation, distribution,controlling factors and fluxes of surface seawater partial pressure of CO2(pCO2),N2O and CH4 were determined during the surveies on Dalian Bay in Nov-2009 and Jan-2010.The main research work is as follows:1. The results show that the pCO2 ranged from 435.68 to 510.41μatm,with an average of 473.01μatm during the survey in Nov-2009.While it ranged from 350.95μatm to 556.52μatm,with an average of 396.53μatm during the survey in Jan-2010.Dalian Bay area acted as a source of atmospheric CO2 in autumn,While it acted as a sink in winter.2. A good positive correlation has been found between pCO2 and Tem or Sal during the survey in Nov-2009,while there were no significant correlation between them during the survey in Jan-2010.In addition, A good correlation has been found between pCO2 and saturation of DO in Nov-2009,while pCO2 and DO had exactly the opposite change.3. The results show that the distributions of CH4 and N2O in the surface waters both illustrate a decrease of CH4 and N2O concentration on shore to offshore.Both CH4 and N2O in the surface waters were supersaturated during the two surveies.CH4 fluxes from the Dalian Bay were 52.88±68.42 and 113.91±146.82μmol·m-2·d-1,respectively by LM86 and W92 during the survey in Nov-2009,and they were 133.07±193.37 and 286.96±416.98μmol·m-2·d-1,respectively during the survey in Jan-2010. CH4 fluxes were higher in winter than they were in antumn by a factor of 2.6.While N2O fluxes were 3.30±4.78 and 10.62±10.74 umol·m-2·d-1(LM86),respectively.N2O fluxes were higher in winter than they were in antumn by a factor of 3.2.
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