春季南海溶存N2O的分布特征和海气交换通量  

Distribution and Air-Sea Fluxes of N_2O in South China Sea in Spring

作　　者：郑立晓[1] 张桂玲[1] 许洁[1] 张峰[1] 张经[2] 

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]华东师范大学河口海岸国家重点实验室,上海200062

出　　处：《海洋环境科学》2009年第3期233-237,共5页Marine Environmental Science

基　　金：国家自然科学重大基金资助项目(40490265);国家自然科学青年基金资助项目(40506025)

摘　　要：2005年4月28日至5月11日在南海北部进行了调查，测定了南海不同深度海水中溶解N20的浓度。结果表明，表层海水中的N2O浓度范围在5．17～14．9nmolfL，饱和度范围为90．4％～236．3％，除个别站位外，表层水体中N2O均处于过饱和状态，是大气中N2O的净源。在研究海域陆架．陆坡站位和海盆区站位N2O的垂直分布有一共同特点：透光层海水中N20垂直混合较为均匀。利用Liss和Merlivat公式（LM86）以及Wanninkhof公式（W92）分别计算了南海N2O海-气交换通量，结果为-0．57～32．93μmol／m^2·d和．1．1—53．51μmol／m^2·d，此外，我们还估算了南海对大气N2O的贡献为0．15～0．24Tg/a，要远高于开阔大洋。The concentrations of dissolved nitrous oxide in the seawater at different depths were investigated in the north South China Sea during Apr. 28 - May 11, 2005. The results showed that the N2O concentrations in the surface water ranged between 5.17 and 14.9 nmol/L, with saturations range between 90.4% - 236.3%. All of surface seawater was saturated with N2O except a few stations. It showed that this area was a source of N2O which release N2O into the atmosphere. In the continental shelf-slope and basin stations the vertical distribution of N2O has a common feature well mixed in the euphotic layer. The N2O flux between air and sea were -0.57 - 32.93 μmol/m2 · d and -1.1 -53.51 μmol/m^2 · d, which were calculated using the Liss and Merlivat （LM86） and Wanninkhof formula （W92） ,respectively. Besides, the N2O in the atmosphere contributed in the studied area was about 0.15 -0.24 Tg/ a, much higher than the proportion contributed by the open ocean.

关 键 词：南海 N2O 分布 海-气交换通量 

分 类 号：P734.4[天文地球—海洋化学]