The comparison of sediment trap data with physical and biogeochemical variables in the surface water column of the Tropical Northwestern Pacific Ocean (TNWPO) indicated that the magnitude of the springtime biological pump has reduced with time due to a corresponding decrease in the biomass of cyanobacterial N2 fixer. The decrease in the biomass of N2 fixer likely resulted from a reduction in phosphate concentrations in response to surface water warming and consequent shoaling of the mixed layer depth during the study period (2009â '2014). The same reduction in biological pump was also observed during summer. However, the cause of the summer reduction remains uncertain and is worth assessing in future studies. Our findings have major implications for predicting future trends of the biological pump in the TNWPO, where significant warming has occurred.
Bibliographical noteFunding Information:
This work was supported by the Korea Institute of Ocean Science and Technology (PE99397). Partial support was provided by Basic Science Research Program (2012R1A6A3A04038883) funded by Mistry of Education and the National Research Foundation of Korea and "Development of satellite based ocean carbon flux model for seas around Korea" funded by the Ministry of Ocean and Fisheries.
© 2017 The Author(s).
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