【作者】 王芹；

【导师】 关道明；

【作者基本信息】 大连海事大学 ， 环境科学与工程， 2010， 硕士

【摘要】 本文选择受人类活动影响较大的大连湾海域为研究区域,分别于2009年11月和2010年1月对该海域进行了调查,对该海域表层海水CO2分压、CH4和N2O的分布特征、影响因素及三者的海-气交换通量的时空变化进行了分析,得到的主要结论如下：1、2009年11月和2010年1月两个航次大连湾海域表层海水pCO2测值范围分别为435～510和350-556μatm,统计平均值分别为473和396μatm,两个航次调查期间该海域分别表现为大气CO2的源区和汇区。2、海水pCO2的影响因素比较复杂,区域差异明显。2009年11月航次大连湾表层海水pCO2分布与盐度、温度呈良好的负相关性,而2010年1月航次该海域pC02分布与盐度、温度无明显相关性。2009年11月航次大连湾溶解氧饱和度>100%的海域pCO2与溶解氧呈良好的正相关性,溶解氧饱和度<100%的海域则呈现出负相关性；2010年1月航次表层海水溶解氧含量明显高于2009年11月航次,pC02与溶解氧变化趋势相反。3、2009年11月和2010年1月两个航次表层海水溶存CH4和N2O浓度均表现出自近岸向外海逐渐降低的分布特征。总的来说,除个别站位外,调查海区表层溶解CH4和N2O在调查时间内均处于过饱和状态。采用Liss and Merlivat(LM86)和Wanninkhof(W92)两种不同的气体交换模式分别计算了CH4和N2O的海-气交换通量。结果表明,2009年11月和2010年1月两个航次大连湾CH4的海-气交换通量分别为52.88±68.42(LM86)、113.91±146.82μmol·m-2·d-1(W92)和133.07±193.37(LM86)、286.96±416.98μmol·m-2·d-1(W92),2010年1月航次约是2009年11月航次的2.6倍;两个航次N2O的海-气交换通量分别为3.30±4.78μmol·m-2·d-1和10.62±10.74μmol.m-2.d-1(LM86),冬季航次约是秋季的3.2倍。更多还原

【Abstract】 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.更多还原