Concurrent reductions in sinking particle flux and its ratios of opal and organic carbon to CaCO3 in the oligotrophic western North Pacific Ocean during 2007-2014 SCIE SCOPUS

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Title
Concurrent reductions in sinking particle flux and its ratios of opal and organic carbon to CaCO3 in the oligotrophic western North Pacific Ocean during 2007-2014
Author(s)
Jeong, Jin-Hyun; Kim, Dongseon; Kim, Hyung Jeek; Kim, Eung; An, Soonmo; Kim, Tae-Wook
KIOST Author(s)
Kim, Dongseon(김동선)Kim, Hyung Jeek(김형직)Kim, Eung(김응)
Publication Year
2019-01
Abstract
Sediment trap data collected from the western North Pacific Ocean (NPO) revealed a reduction in sinking particle flux (SPF) to the mesopelagic zone (similar to 1000 m) during 2012-2014 compared to levels during 2007-2011. Satellite-based net primary production (NPP) estimates showed no discernable decline with time, resulting in a decreasing SPF/NPP ratio. Based on a synchronized reduction in the opal/CaCO3 ratio, the decline in SPF can be attributed to a shift in the relative composition of phytoplankton from a group with relatively high nutrient demand (i.e., diatoms) to those with low nutrient demand (i.e., coccolithophores and other small phytoplankton adapted to a more nutrient-depleted environment). This shift could result in a decline in particle export below the mixed layer depth (MLD) and an increase in regenerated production (or nutrient recycling) within the MLD, which could be reconciled with decreasing SPF and non-decreasing NPP, as shown by the significant correlation between SPF/NPP and the opal/CaCO3 ratio. Environmental factors associated with nutrient availability were investigated, along with climate variability indices of the NPO. Using eddy kinetic energy, vertical Ekman transport, and vertical density profiles, the nutrient deficiency was partially explained during the seasons showing significant SPF reductions. An association between SPF and the Pacific Decadal Oscillation was identified. However, the 7-year data were not sufficient for verification. The results of this study indicate that particle fluxes to depth and ocean biological pumps are subject to interannual variability caused by various factors.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/706
DOI
10.1016/j.dsr.2018.11.009
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.143, pp.58 - 69, 2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
EDDY KINETIC-ENERGY; NITROGEN-FIXATION; CHLOROPHYLL-A; CLIMATE; VARIABILITY; EXPORT; SEQUESTRATION; PRODUCTIVITY; OSCILLATION; TEMPERATURE
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Particle flux,Carbon cycle,Climate Change,입자 플럭스,탄소순환,기후변화

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