The reduction in the biomass of cyanobacterial N2fixer and the biological pump in the Northwestern Pacific Ocean.
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 N2fixer. The decrease in the biomass of N2fixer 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 (2009-2014). 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.
Marine Chemistry and Geochemistry Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Dongseon
D
Kim
Marine Chemistry and Geochemistry Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Jin-Hyun
JH
Jeong
Department of Marine Science, Incheon National University, Incheon, South Korea.
Tae-Wook
TW
Kim
Marine Ecosystem and Biological Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Jae Hoon
JH
Noh
Deep-sea and Seabed Mineral Resources Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Hyung Jeek
HJ
Kim
Marine Ecosystem and Biological Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Dong Han
DH
Choi
Marine Safety Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Eung
E
Kim
Physical Oceanography Research Center, Korea Institute of Ocean Science &Technology, Ansan, South Korea.
Dongchull
D
Jeon
D018533:Biomass; D002244:Carbon / Q000378:metabolism; D000458:Cyanobacteria / Q000254:growth & development* / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D009586:Nitrogen Fixation; D010140:Pacific Ocean; D010839:Phytoplankton / Q000502:physiology; D012621:Seasons
D026901:Membrane Transport Proteins; D002244:Carbon; D009584:Nitrogen