CAJ | 학술논문

有色可溶性有机物(colored dissolved organic matter, CDOM)光谱吸收特性是构建生物光学模型及水色遥感反演算法的重要基础。在2011年4月1日至5月中旬的东印度洋综合科学考察实验研究航次中,采集了6°N断面9个站位的CDOM样品并进行了测量；通过分析吸收系数aCDOM、光谱斜率值S、CDOM分子量相对大小的指示参数 M值等参量,探讨了该断面处CDOM浓度与组成成分的分布及影响因素。分析结果发现, aCDOM(355)的变化范围为0.131-0.524m?1,平均值为0.272m?1；aCDOM(375)的变化范围为0.081-0.453m?1,平均值为0.242m-1,该范围小于近岸水体,高于东南太平洋海水,与南海北部18°N 断面相近。叶绿素 a 浓度与 CDOM 吸收系数及光谱斜率没有表现出明显的相关性。CDOM 光谱斜率的变化范围较大,其中 S300-500nm的变化范围为0.008-0.019nm?1,平均值为0.012nm?1。S300-350nm与M值之间表现出正相关关系,吸收系数与光谱斜率及M值呈现出很好的负相关关系。结合该断面CTD资料发现,在30-90m水层高盐水团的影响下, M值在高盐区的平均值大于其右侧相同深度的结果, aCDOM(355)在高盐区的平均值小于其右侧相同深度的结果；在垂直方向上,受高盐水团影响区域M值没有表现出明显规律,而在其右侧则随着深度的增加M值逐渐减小, aCDOM(355)逐渐增加。
유색가용성유궤물(colored dissolved organic matter, CDOM)광보흡수특성시구건생물광학모형급수색요감반연산법적중요기출。재2011년4월1일지5월중순적동인도양종합과학고찰실험연구항차중,채집료6°N단면9개참위적CDOM양품병진행료측량；통과분석흡수계수aCDOM、광보사솔치S、CDOM분자량상대대소적지시삼수 M치등삼량,탐토료해단면처CDOM농도여조성성분적분포급영향인소。분석결과발현, aCDOM(355)적변화범위위0.131-0.524m?1,평균치위0.272m?1；aCDOM(375)적변화범위위0.081-0.453m?1,평균치위0.242m-1,해범위소우근안수체,고우동남태평양해수,여남해북부18°N 단면상근。협록소 a 농도여 CDOM 흡수계수급광보사솔몰유표현출명현적상관성。CDOM 광보사솔적변화범위교대,기중 S300-500nm적변화범위위0.008-0.019nm?1,평균치위0.012nm?1。S300-350nm여M치지간표현출정상관관계,흡수계수여광보사솔급M치정현출흔호적부상관관계。결합해단면CTD자료발현,재30-90m수층고염수단적영향하, M치재고염구적평균치대우기우측상동심도적결과, aCDOM(355)재고염구적평균치소우기우측상동심도적결과；재수직방향상,수고염수단영향구역M치몰유표현출명현규률,이재기우측칙수착심도적증가M치축점감소, aCDOM(355)축점증가。
The spectral absorption properties of colored dissolved organic matter (CDOM) is important for building bio-optical model and for quantitative ocean color remote sensing. During the Eastern Indian Ocean Integrated Scientific Investigation Cruise from April 1 to mid-May, 2011, CDOM was sampled at nine stations along 6°N. Based on the dataset of 36 samples, we examined the relationship between spectral absorption coefficients and the slope of absorption curve (S). Over the whole transect, aCDOM (355) spanned the range of 0.131?0.524 m?1 with an average value of 0.272 m?1, and aCDOM(375) varied between 0.081 and 0.453 m?1 with an average value of 0.242 m?1. The concentration of CDOM was lower than that of nearshore waters, similar to the findings along 18°N of the South China Sea. There exists low correlation between chlorophyll a and absorption coefficient of CDOM. S300-500nm varied between 0.008 and 0.019 nm?1, averaging 0.012 nm?1;S300-350nm was a good indication to M, the molecular relative weight of CDOM. Absorption coefficient and S of CDOM showed a good negative correlation, so did M and absorption coefficient. By analyzing CTD data along the 6oN section, water mass with high salinity at depth 30?90 m was found to have an impact on horizontal and vertical distribution of M and aCDOM(355).