摘要
依据2011-08和2012-05的现场调查资料,分析渤海水体有色溶解有机物(CDOM)的光谱吸收特性,研究其分布变化特征及影响因素。结果表明:渤海水体a_(355)的变化范围为0.38~4.15m^(-1),均值为1.33m^(-1),表现为莱州湾>渤海湾>辽东湾,春季>夏季的时空变化特征;表层海水a_(355)的水平分布基本呈近岸及河口区高、远岸稍低的变化规律。光谱斜率S_(275~295)和S_(350~400)的变化范围分别为0.011~0.074nm^(-1)和0.012~0.195nm^(-1),春季整体高于夏季。光谱斜率比S_R的变化范围为0.25~2.25,平均值为0.88,夏季略高于春季,其中春季渤海湾最高,莱州湾次之,辽东湾最低;夏季则莱州湾高于渤海湾。渤海春季水体CDOM主要来源于生物现场生产和底层沉积物再悬浮释放,夏季则主要受陆源径流输入的影响。不同时空条件下CDOM在咸淡水的混合过程中也有着不同的表现,春季多呈非保守行为;夏季莱州湾呈保守行为,渤海湾则呈非保守行为。
Based on the in-situ data obtained during the surveys carried out in the Bohai Sea in August 2011 and May 2012, the absorption spectra of Colored Dissolved Organic Matter （CDOM）, as well as its distri- bution characteristics and influencing factors are studied. The results indicate that the absorption coeffi- cient of CDOM at 355 nm （a3ss） ranges from 0.38 to 4.15 m 1, with an average value of 1.33 m-1 in the Bohai Sea, and varies in the order of Laizhou Bay〉Bohai Bay〉Liaodong Bay, spring〉summer〉 Its hori- zontal distributions show that the value of a355 is higher in the inshore and estuary area, lower in the off- shore in the surface water. The spectral slope S275-295 and S355-400 range from 0. 011 to 0. 074 nm-1 and from 0. 012 to 0. 195 nm 1 respectively, and both are higher in spring than those in summer. The spectral slope ratio （SR） with the mean value of 0.88 is ranged from 0.25 to 2.25 ,and featured by slightly higher in sum- mer than that in spring. In detail, SR is the highest in Bohai Bay and the lowest in Liaodong Bay in spring, while it is higher in Laizhou Bay than that in Bohai Bay in summer. Marine biological production and sedi- ment resuspension are the principal sources of CDOM in spring, while terrestrial runoff plays an important role in controlling the abundance of CDOM in summer. Moreover, CDOM of different spatial and temporal conditions show a different characteristics in the mixing process of seawater and fresh water, eg. a355 mostly presents non-conservative behavior in spring and demonstrates conservative behavior in Laizhou Bay, but not in Bohai Bay in summer.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2016年第1期58-69,共12页
Advances in Marine Science
基金
海洋公益性行业科研专项--海洋藻类和细菌固碳(储碳)能力和潜力评估技术研究(201105021)和滨海湿地固碳能力提升技术及应用示范(201205008)
关键词
渤海
有色溶解有机物(CDOM)
吸收系数
光谱斜率
分布特征
Bohai Sea
Colored Dissolved Organic Matter （CDOM）
absorption coefficient
spectral slopedistribution characteristics
