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 Zhang31Jiangsu 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
Received: 28 Feb 2017 – Accepted for review: 03 Mar 2017 – Discussion started: 10 Mar 2017
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.
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., doi:10.5194/bg-2017-68, in review, 2017.