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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2016-380
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 Aug 2016
Review status
This discussion paper has been under review for the journal Hydrology and Earth System Sciences (HESS). The revised manuscript was not accepted.
A systematic examination of the relationship between CDOM and DOC for various inland waters across China
Kaishan Song1, Ying Zhao1,2, Zhidan Wen1, Jianhang Ma1,2, Tiantian Shao1, Chong Fang1,2, and Yingxin Shang1 1Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
2University of Chinese Academy of Sciences, Beijing 100049, China
Abstract. Chromophoric dissolved organic matter (CDOM) plays a vital role in aquatic ecosystems. Strong relationship has been proven between CDOM and dissolved organic carbon (DOC), which set the basis for remote estimation of DOC with remote sensing data. An algorithm has been developed to retrieve DOC via CDOM absorption at 275 and 295 nm with coastal waters. However, the relationship between DOC and aCDOM(275) and aCDOM(295) for different types of inland waters are still not clear. Further, is the relationship stable with different types of inland waters? In the current investigation, samples from fresh lakes, saline lakes, rivers or streams, urban water bodies, ice-covered lakes were examined. The regression model slopes range from 1.03 for urban waters to 3.13 for river water, with extreme low slope value for highly saline waters (slope is about 0.3); while coefficient of determinations (R2) range from 0.71 (urban waters) to 0.93 (winter waters). The specific CDOM absorption (SUVA254) showed the similar trend, i.e., low values were observed for saline water and waters from semi-arid or arid regions, where strong photo-bleaching is expect due to thin ozone layers, less cloud cover, longer water residence time and sunshine hours. In the contrast, high values were measured with waters developed in wetlands or forest in Northeast China, where inverse environmental settings were witnessed. The investigation also demonstrated that stronger relationships between CDOM and DOC were revealed when CDOM275 were sorted by SUVA254 (0.78 < R2 < 0.98) or the ratio of CDOM250:CDOM365 (0.78 < R2 < 0.99). Our results highlight that non-unified relationship exhibits for different types of inland waters, and remote sensing models for DOC need to be tuned with different inherent optical parameters obtained from various types of waters for quantification of DOC in inland waters.

Citation: Song, K., Zhao, Y., Wen, Z., Ma, J., Shao, T., Fang, C., and Shang, Y.: A systematic examination of the relationship between CDOM and DOC for various inland waters across China, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-380, 2016.
Kaishan Song et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'Referee Comment', Anonymous Referee #1, 08 Sep 2016 Printer-friendly Version 
AC1: 'Reviewer-1 and responses', Kaishan Song, 24 Nov 2016 Printer-friendly Version 
 
RC2: 'HESS-2016-380 comments', Anonymous Referee #2, 11 Oct 2016 Printer-friendly Version 
AC2: 'Reviewer-2 and responses', Kaishan Song, 24 Nov 2016 Printer-friendly Version 
Kaishan Song et al.
Kaishan Song et al.

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Short summary
CDOM has strong link with DOC, which sets the basis for remote estimation of DOC in waters. However, the relationships between DOC and CDOM absorption for different types of inland waters may vary which worth further systematic investigations. Samples from fresh lakes, saline lakes, rivers, urban water bodies, ice-covered lakes were measured to examine the relationship between DOC and CDOM. The regression model slopes range from 1.03 for urban waters to 3.13 for river water.
CDOM has strong link with DOC, which sets the basis for remote estimation of DOC in waters....
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