Absorption Properties and Mixing Behavior of CDOM in the Pearl River Estuary, China
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AbstractDeep understanding of optical
absorption properties and mixing behavior of CDOM in estuary is necessary for
tracking coastal organic carbon transport using satellite remote sensing data.
87 water samples were collected in the Pearl River Estuary (PRE), China during
a cruise in May 2014, to measure spectral absorption of chromophoric dissolved
organic matter (CDOM), together with salinity, PH, temperature, chl-a
concentration and SPM concentration. Over a salinity range of 0-30, CDOM
absorption coefficients at 355 nm (a(355)) ranged from 0.197 to 5.557 and the
spectral slope in the UV domain (Sg(275-295)) extended from 0.012 to 0.029.
Significant negative power-exponential relationship was found between a(cdom)
and Sg(275-295), indicating increasing percentage of light-absorption aromatic
structure in CDOM chromophores with Sg decrease. The M value, which indicates
CDOM molecule composition, were calculated by a ratio of a(250) to a(365). Relatively
significant negative linear relationships existed between a(cdom) and M,
illustrating that terrestrial humic acid contains high light-absorption
aromatic content in CDOM chromophores. Sg(285-315) was found to be a better
indicator of CDOM chromophores than the frequently used Sg(275-295) and
Sg(350-400). Relatively obvious conservative mixing behavior was found in the
PRE, because relatively significant linear relationship exist between salinity
and a(cdom), Sg(275-295) and M value.
Acceptance Date20/06/2016
All Author(s) ListLEI Xia, PAN Jiayi
Name of ConferenceOcean Optics XXIII Conference
Start Date of Conference23/10/2016
End Date of Conference28/10/2016
Place of ConferenceVictoria
Country/Region of ConferenceCanada
Year2016
LanguagesEnglish-United States

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