Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column

Particle size distribution (PSD) in the ocean is a fundamental property that influences carbon export and food webs; however, PSD variation and its causes in oligotrophic oceans are not entirely clear. Here, we used Laser In-Situ Scattering and Transmissometry to investigate PSD (size range 5.2–119...

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Autores principales:	Yosuke Yamada, Hideki Fukuda, Yu Umezawa, Toshi Nagata
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	slope of particle size distribution chlorophyll a transparent exopolymer particles (TEP) Kuroshio nanophytoplankton particle aggregation Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/491f33721fbb4ac997f53c822d53eeda
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spelling	oai:doaj.org-article:491f33721fbb4ac997f53c822d53eeda2021-11-16T04:49:51ZGeographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column2296-774510.3389/fmars.2021.768766https://doaj.org/article/491f33721fbb4ac997f53c822d53eeda2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.768766/fullhttps://doaj.org/toc/2296-7745Particle size distribution (PSD) in the ocean is a fundamental property that influences carbon export and food webs; however, PSD variation and its causes in oligotrophic oceans are not entirely clear. Here, we used Laser In-Situ Scattering and Transmissometry to investigate PSD (size range 5.2–119 μm) and related variables at 11 stations in the surface layer (0–20 m) of the Kuroshio region of the western North Pacific, where strong current causes dynamic hydrographic and ecological conditions. PSD slopes (range –3.2 to –4.2), derived from the power law model, were steeper at onshore stations and flatter at oligotrophic stations located offshore and at lower latitudes. Notably, slopes tended to become steeper with increasing chlorophyll a concentration, opposing the generally observed relationship between the two variables, whereas they became flatter with increasing transparent exopolymer particle (TEP) concentration. Possible explanations of the above results are localized occurrence of nanophytoplankton and TEP facilitation of particle aggregation. The results support the hypothesis that PSD slopes are controlled by a multitude of factors, including phytoplankton community dynamics and aggregation processes. To determine whether TEP-induced particle aggregation enhances or suppresses carbon export, we need a better understanding of the nature (porosity, density, and sinking velocity) of aggregates in oligotrophic oceans.Yosuke YamadaHideki FukudaYu UmezawaToshi NagataFrontiers Media S.A.articleslope of particle size distributionchlorophyll atransparent exopolymer particles (TEP)Kuroshionanophytoplanktonparticle aggregationScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	slope of particle size distribution chlorophyll a transparent exopolymer particles (TEP) Kuroshio nanophytoplankton particle aggregation Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	slope of particle size distribution chlorophyll a transparent exopolymer particles (TEP) Kuroshio nanophytoplankton particle aggregation Science Q General. Including nature conservation, geographical distribution QH1-199.5 Yosuke Yamada Hideki Fukuda Yu Umezawa Toshi Nagata Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
description	Particle size distribution (PSD) in the ocean is a fundamental property that influences carbon export and food webs; however, PSD variation and its causes in oligotrophic oceans are not entirely clear. Here, we used Laser In-Situ Scattering and Transmissometry to investigate PSD (size range 5.2–119 μm) and related variables at 11 stations in the surface layer (0–20 m) of the Kuroshio region of the western North Pacific, where strong current causes dynamic hydrographic and ecological conditions. PSD slopes (range –3.2 to –4.2), derived from the power law model, were steeper at onshore stations and flatter at oligotrophic stations located offshore and at lower latitudes. Notably, slopes tended to become steeper with increasing chlorophyll a concentration, opposing the generally observed relationship between the two variables, whereas they became flatter with increasing transparent exopolymer particle (TEP) concentration. Possible explanations of the above results are localized occurrence of nanophytoplankton and TEP facilitation of particle aggregation. The results support the hypothesis that PSD slopes are controlled by a multitude of factors, including phytoplankton community dynamics and aggregation processes. To determine whether TEP-induced particle aggregation enhances or suppresses carbon export, we need a better understanding of the nature (porosity, density, and sinking velocity) of aggregates in oligotrophic oceans.
format	article
author	Yosuke Yamada Hideki Fukuda Yu Umezawa Toshi Nagata
author_facet	Yosuke Yamada Hideki Fukuda Yu Umezawa Toshi Nagata
author_sort	Yosuke Yamada
title	Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
title_short	Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
title_full	Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
title_fullStr	Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
title_full_unstemmed	Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
title_sort	geographic variation of particle size distribution in the kuroshio region: possible causes in the upper water column
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/491f33721fbb4ac997f53c822d53eeda
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Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column

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