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Biogeosciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/bg-2017-68
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
10 Mar 2017
Review status
A revision of this discussion paper is under review for the journal Biogeosciences (BG).
Variation pattern of particulate organic carbon and nitrogen in oceans and inland waters
Changchun Huang1,2,3, Lin Yao4, Hao Yang1,3, Chen Lin5, Tao Huang1,3, Mingli Zhang1, A-xing Zhu1,2,6, and Yimin Zhang3 1Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing 210023, China
2Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China
3School of geography science, Nanjing Normal University, Nanjing 210023, China
4State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
5Key Laboratory of Watershed Geographic Sciences, Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
6Department of Geography, University of Wisconsin, Madison, Wisconsin 53706, USA
Abstract. We examined the relationship between, and variations in, particulate organic carbon (POC) and particulate organic nitrogen (PON) based on previously acquired ocean and inland water data. Some new points were found beside the traditional latitude, depth and temperature dependence of POC, PON and POC/PON. The global average value of POC/PON (7.54±3.82) is higher than the Redfield ratio (6.63). The mean values of POC/PON in south and north hemisphere are 7.40±3.83 and 7.80±3.92, respectively. The high values of POC/PON appeared between 80° N~90° N (12.2±7.5) and 70° N~80° N (9.4±6.4), and relatively low POC/PON were found from 20 °N (6.6±2.8) to 40 °N (6.7±2.7). The latitudinal dependency of POC/PON in the northern hemisphere is much stronger than in the southern hemisphere. Variations of POC/PON in inland water also showed similar latitude-dependency of POC/PON in ocean water, but significantly regulated by lake’s morphology, trophic state and climate, etc. factors. Higher POC and PON could be expected in the coastal water, while POC/PON significantly increased from 6.89±2.38 to 7.59±4.22 in north hemisphere with the increasing rate of 0.0024/km. The coupling relationship between POC and PON in oceans is much stronger than in inland waters. Variations in POC, PON and POC/PON in inland waters should receive more attention due to the importance of these values to global carbon and nitrogen cycles and the indeterminacy of the relationship between POC and PON.

Citation: Huang, C., Yao, L., Yang, H., Lin, C., Huang, T., Zhang, M., Zhu, A.-X., and Zhang, Y.: Variation pattern of particulate organic carbon and nitrogen in oceans and inland waters, Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-68, in review, 2017.
Changchun Huang et al.
Changchun Huang et al.
Changchun Huang et al.

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Short summary
The latitudinal dependency of POC/PON in ocean and inland water is significant, regulated by trophic state and climate, etc. factors. POC/PON significantly increased from coastal water (6.89±2.38) to open ocean (7.59±4.22) with the increasing rate of 0.0024/km. The re-examination of global relationship between, and variations in POC and PON could be important for the global and regional coupling between the carbon and nitrogen cycles in ocean and freshwater.
The latitudinal dependency of POC/PON in ocean and inland water is significant, regulated by...
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