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Journal of Tropical Oceanography >

2013 , Vol. 32 >Issue 4: 13 - 21

DOI: https://doi.org/10.11978/j.issn.1009-5470.2013.04.003

Marine Physics

Spectral absorption properties of colored dissolved organic matter along 6°N transect of tropical eastern Indian Ocean

  • HU Shui-bo ,
  • CAO Wen-xi ,
  • LIN Jun-fang ,
  • YANG Yue-zhong ,
  • WANG Gui-fen ,
  • ZHOU wen
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  • 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China;

Received date: 2011-09-05

  Revised date: 2011-10-25

  Online published: 2013-10-30

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Abstract

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 Sof CDOM showed a good negative correlation, so did Mand 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 Mand aCDOM(355).

Key words： colored dissolved organic matter(CDOM); spectral absorption coefficient; tropical eastern Indian Ocean

Cite this article

HU Shui-bo , CAO Wen-xi , LIN Jun-fang , YANG Yue-zhong , WANG Gui-fen , ZHOU wen . Spectral absorption properties of colored dissolved organic matter along 6°N transect of tropical eastern Indian Ocean[J]. Journal of Tropical Oceanography, 2013 , 32(4) : 13 -21 . DOI: 10.11978/j.issn.1009-5470.2013.04.003

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