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Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific : A new proxy for marine nitrate dynamics

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Title: Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific : A new proxy for marine nitrate dynamics
Authors: Yamazaki, Atsuko Browse this author
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Ogawa, Nanako O. Browse this author
Ohkouchi, Naohiko Browse this author
Shirai, Kotaro Browse this author
Toratani, Mitsuhiro Browse this author
Uematsu, Mitsuo Browse this author
Issue Date: 14-Oct-2011
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Biogeosciences
Volume: 116
Start Page: G04005
Publisher DOI: 10.1029/2011JG001697
Abstract: To demonstrate the utility of coral skeletons as a recorder of nitrate dynamics in the surface ocean, we collected coral skeletons of Porites lobata and determined their nitrogen isotope composition (δ15N_[coral]) from 2002 to 2006. Skeletons were collected at Okinotori Island in southwestern Japan, far from any sources of terrestrial nitrogen. Nitrogen isotope compositions along the growth direction were determined at 800 μm intervals (∼1 month resolution) and compared against the skeletal carbon isotope composition (δ13C_[coral-carb]), barium/calcium ratio (Ba/Ca), and Chlorophyll-a concentration (Chl-a). From 2002 to 2004, ratios of the δ15N_[coral] varied between +0.8 and +8.3‰ with inverse variation to SST (r = -0.53). Ba/Ca ratios and Chl-a concentrations were also observed to be high during seasons with low SST. These results suggested that the vertical mixing that occurs during periods of low SST carries nutrients from deeper water (δ15N_[DIN]; +5∼+6‰) to the sea surface. In 2005 onward, δ15N_[coral] and Ba/Ca ratios also had positive peaks even in high SST during periods of transient upwelling caused by frequent large typhoons (maximum wind speed 30 m/s). In addition, low δ15N_[coral] (+0.8∼+2.0‰) four months after the last typhoon implied nitrogen fixation because of the lack of typhoon upwelling through the four years record of δ15N_[coral]. Variations in the δ13C_[coral-carb] and δ15N_[coral] were synchronized, suggesting that nitrate concentration could control zooxanthellae photosynthesis. Our results suggested that δ15N_[coral] holds promise as a proxy for reconstructing the transport dynamics of marine nitrate and thus also a tool for estimating nitrate origins in the tropical and subtropical oceans.
Rights: Copyright 2011 by the American Geophysical Union
Type: article
URI: http://hdl.handle.net/2115/49002
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山崎 敦子

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