Short term variability of Particle fluxes and its relation to variability in sea surface temperature and chlorophylla field detected by Ocean Color and Temperature Scanner (OCTS) off Sanriku, northwestern North Pacific in the spring of 1997

Saino, Toshiro; Shang, Shaoling; Mino, Yoshihisa; Suzuki, Koji; Nomura, Hideaki; Saitoh, Sei–Ichi; Miyake, Hideo; Masuzawa, Toshiyuki; Harada, Koh

doi:10.1007/bf02742460

Cited by 26 publications

(13 citation statements)

References 18 publications

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“…Therefore, we attributed the sporadic turbidity increases to dense marine snowfall related to phytoplankton blooms at the sea surface. Saino et al (1998) reported short-term spikes in the organic carbon flux in sediment traps deployed off Sanriku. Our turbidity sensor data and photographic evidence support their finding, Fig.…”

Section: Temporal and Spatial Fluctuations In Marine Snowmentioning

confidence: 96%

Long-term monitoring of bottom environments of the continental slope off Otsuchi Bay, northeastern Japan

et al. 2015

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Section: Temporal and Spatial Fluctuations In Marine Snowmentioning

confidence: 96%

Long-term monitoring of bottom environments of the continental slope off Otsuchi Bay, northeastern Japan

et al. 2015

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“…The Kuroshio Current transports warm (.15uC), saline, and oligotrophic waters northeast along the southeast coast of Japan (Nagata et al, 1992). The convergence of these three surface waters generates hydrological fronts that are very productive, especially during the so-called ''Yakumizu'' bloom of late winter and spring diatoms (Saino et al, 1998;Itou et al, 2000). FIGURE 2.…”

Section: Study Areamentioning

confidence: 99%

“…The study area is of high interest since it is characterized by a so-called oxygen-minimum zone (OMZ) at intermediate depths (700-1500 m). This OMZ results from a combination of high productivity and poor ventilation of upper intermediate waters (Nagata et al, 1992;Saino et al, 1998). Moreover, this area may be affected by sedimentary instability resulting from seismic and volcanic activities (Itou et al, 2000).…”

Section: Introductionmentioning

confidence: 98%

Living (Stained) Deep-Sea Foraminifera Off Hachinohe (Ne Japan, Western Pacific): Environmental Interplay in Oxygen-Depleted Ecosystems

Fontanier¹,

Duros²,

Toyofuku³

et al. 2014

The Journal of Foraminiferal Research

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Live (Rose-Bengal stained) deep-sea foraminiferal faunas have been studied at five stations between 500-2000-m depth along the NE Japanese margin (western Pacific) to understand how complex environmental conditions (e.g., oxygen depletion, organic matter) control their structure (i.e., diversity, standing stocks, and microhabitats). All stations are characterized by silty sediments with no evidence of recent physical disturbances. The three stations located between 760-1250 m are bathed by dysoxic bottom waters (,45 mmol/L). Although high organic-carbon contents are recorded at all stations (.2.2% DW), only the oxygendepleted sites are characterized by higher concentrations of sugars, lipids, and enzymatically hydrolysable amino acids (EHAA). Sedimentary contents in chlorophyllic pigments decrease with water depth without any major change in their freshness (i.e., [Chl a/(Chl a + Pheo a)] ratios). Both Uvigerina akitaensis and Bolivina spissa are restricted to the stations bathed by dysoxic waters, proving their oxygendepletion tolerance. In such conditions, both phytophagous taxa are obviously able to take advantage of labile organic compounds (e.g., lipids and EHAA) contained in phytodetritus. Nonionella stella and Rutherfordoides cornuta survive in oxygen-depleted environments probably via alternative metabolic pathways (e.g., denitrification ability) and a large flexibility in trophic requirements. At stations where oxygen availability is higher (i.e., .70 mmol/L in bottom water) and where bioavailable organic compounds are slightly less abundant, diversity indices remain low, and more competitive species (e.g.

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“…Surface waters in the area are dominated by three major currents: the Tsugaru Warm Current, the Kuroshio Current and the Oyashio Current. The convergence of these current systems results in a number of hydrological fronts sustaining high productivity in this area (Saino et al, 1998;Itou et al, 2000). Below 200 m water depth, the North Pacific Intermediate Water (NIPW) mixes gradually with saline Deep Pacific Water (DPW), entering this area between a water depth of 800 and 3000 m. The development of a dysoxic water mass approximately between water depths of 700 and 1400 m is related to both high surface water productivity, resulting in enhanced remineralisation of organic matter and associated oxygen consumption, and poor intermediate water ventilation at depth (Nagata et al, 1992).…”

Section: Study Areamentioning

confidence: 99%

Benthic foraminiferal Mn / Ca ratios reflect microhabitat preferences

et al. 2017

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Abstract. The Mn / Ca of calcium carbonate tests of living (rose-Bengal-stained) benthic foraminifera (Elphidium batialis, Uvigerina spp., Bolivina spissa, Nonionellina labradorica and Chilostomellina fimbriata) were determined in relation to pore water manganese (Mn) concentrations for the first time along a bottom water oxygen gradient across the continental slope along the NE Japan margin (western Pacific). The local bottom water oxygen (BWO) gradient differs from previous field study sites focusing on foraminiferal Mn / Ca and redox chemistry, therefore allowing further resolution of previously observed trends. The Mn / Ca ratios were analysed using laser ablation inductively coupled plasma-mass spectrometer (ICP-MS), allowing singlechamber determination of Mn / Ca. The incorporation of Mn into the carbonate tests reflects environmental conditions and is not influenced by ontogeny. The inter-species variability in Mn / Ca reflected foraminiferal in-sediment habitat preferences and associated pore water chemistry but also showed large interspecific differences in Mn partitioning. At each station, Mn / Ca ratios were always lower in the shallow infaunal E. batialis, occupying relatively oxygenated sediments, compared to intermediate infaunal species, Uvigerina spp. and B. spissa, which were typically found at greater depth, under more reducing conditions. The highest Mn / Ca was always recorded by the deep infaunal species N. labradorica and C. fimbriata. Our results suggest that although partitioning differs, Mn / Ca ratios in the intermediate infaunal taxa are promising tools for palaeoceanographic reconstructions as their microhabitat exposes them to higher variability in pore water Mn, thereby making them relatively sensitive recorders of redox conditions and/or bottom water oxygenation.

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Short term variability of Particle fluxes and its relation to variability in sea surface temperature and chlorophylla field detected by Ocean Color and Temperature Scanner (OCTS) off Sanriku, northwestern North Pacific in the spring of 1997

Cited by 26 publications

References 18 publications

Long-term monitoring of bottom environments of the continental slope off Otsuchi Bay, northeastern Japan

Long-term monitoring of bottom environments of the continental slope off Otsuchi Bay, northeastern Japan

Living (Stained) Deep-Sea Foraminifera Off Hachinohe (Ne Japan, Western Pacific): Environmental Interplay in Oxygen-Depleted Ecosystems

Benthic foraminiferal Mn / Ca ratios reflect microhabitat preferences

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Short term variability of Particle fluxes and its relation to variability in sea surface temperature and chlorophylla field detected by Ocean Color and Temperature Scanner (OCTS) off Sanriku, northwestern North Pacific in the spring of 1997

Cited by 26 publications

References 18 publications

Long-term monitoring of bottom environments of the continental slope off Otsuchi Bay, northeastern Japan

Long-term monitoring of bottom environments of the continental slope off Otsuchi Bay, northeastern Japan

Living (Stained) Deep-Sea Foraminifera Off Hachinohe (Ne Japan, Western Pacific): Environmental Interplay in Oxygen-Depleted Ecosystems

Benthic foraminiferal Mn / Ca ratios reflect microhabitat preferences

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Benthic foraminiferal Mn / Ca ratios reflect microhabitat preferences