Preliminary assessment of eutrophication by remotely sensed chlorophyll-a in Toyama Bay, the Sea of Japan

Terauchi, Genki; Tsujimoto, Ryo; Ishizaka, Joji; Nakata, Hideaki

doi:10.1007/s10872-014-0222-z

Cited by 24 publications

(18 citation statements)

References 21 publications

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“…Ocean currents transport water with heat and solved materials, and thus they are related to climate properties and distributions of dissolved and particulate matter (Thorpe, 2010). The biological importance of ocean currents has been accepted for a century, since Hjort (1914), and is especially applicable in coastal areas which only cover 7 % of the ocean but support 90 % of global fish catches (Pauly et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

et al. 2018

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Abstract. This study evaluates spatial variations in zooplankton community structure and potential controlling factors along the Japanese coast under the influence of the coastal branch of the Tsushima Warm Current (CBTWC). Variations in the density of morphologically identified zooplankton in the surface layer in May were investigated for a 15-year period. The density of zooplankton (individuals per cubic meter) varied between sampling stations, but there was no consistent west–east trend. Instead, there were different zooplankton community structures in the west and east, with that in Toyama Bay particularly distinct: Corycaeus affinis and Calanus sinicus were dominant in the west and Oithona atlantica was dominant in Toyama Bay. Distance-based redundancy analysis (db-RDA) was used to characterize the variation in zooplankton community structure, and four axes (RD1–4) provided significant explanation. RD2–4 only explained < 4.8 % of variation in the zooplankton community and did not show significant spatial difference; however, RD1, which explained 89.9 % of variation, did vary spatially. Positive and negative species scores on RD1 represent warm- and cold-water species, respectively, and their variation was mainly explained by water column mean temperature, and it is considered to vary spatially with the CBTWC. The CBTWC intrusion to the cold Toyama Bay is weak and occasional due to the submarine canyon structure of the bay. Therefore, the varying bathymetric characteristics along the Japanese coast of the Japan Sea generate the spatial variation in zooplankton community structure, and dominance of warm-water species can be considered an indicator of the CBTWC.

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Section: Introductionmentioning

confidence: 99%

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

et al. 2018

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“…The spatial resolution was 4 × 4 km, and the SSChl a concentration of a station was taken from the nearest neighbor data point. The validation of daily SSChl a data in Toyama Bay has already been reported by Terauchi et al (2014b). The monthly composite data was chosen in our study to avoid having many data blanks.…”

Section: Other Hydrographic Datamentioning

confidence: 99%

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Kodama¹,

Wagawa²,

Iguchi³

et al. 2017

Preprint

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Abstract. This study evaluates spatial variations in zooplankton community structure and potential controlling factors along 10 the Japanese coast under the influence of the coastal branch of the Tsushima Warm Current (CBTWC). Variations in the density of morphologically-identified zooplankton in the surface layer in May were investigated for a 15-year period. The density of zooplankton (individuals per cubic meter) varied between sampling stations, but there was no consistent west-east trend. Instead, there were different zooplankton community structures in the west and east, with that in Toyama Bay particularly distinct: Corycaeus affinis and Calanus sinicus were dominant in the west and Oithona atlantica was dominant in 15 Toyama Bay. Distance-based redundancy analysis (db-RDA) was used to characterize the variation in zooplankton community structure, and four axes (RD1-4) provided significant explanation. RD2-4 only explained <6.5% of variation in the zooplankton community and did not show significant spatial difference; however, RD1, which explained 84.6% of variation, did vary spatially. Positive and negative species scores on RD1 represent warm-and cold-water species, respectively, and their variation was mainly explained by water column mean temperature. Water column mean temperature is highly correlated 20 with mean and maximum salinity, and it is considered to vary spatially with the CBTWC. The CBTWC intrusion to cold Toyama Bay is weak and occasional due to the submarine canyon structure of the bay. Therefore, the varying bathymetric characteristics along the Japanese coast of the Japan Sea generate the spatial variation in zooplankton community structure, and dominance of warm-water species can be considered an indicator of the CBTWC.

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“…The best performance of the SAM_LT algorithm when STRAYLIGHT is flagged is likely due to the contemporaneous consideration of all spectral information provided by 10 MODIS bands, which attenuates the effect of incorrect blue/green reflectance ratios. The presence of stray light, in fact, alters the blue/green ratio leading to significant [CHL] overestimation [Terauchi et al, 2014]. On the contrary, the consideration of all spectral bands reduces the efficiency of SAM_LT when ABSAER is flagged, since the absorbing aerosol shows variable spectral properties that could affect all regions of the reflectance spectrum.…”

Section: Effects Of Flagsmentioning

confidence: 99%

Assessment of three algorithms for the operational estimation of [CHL] from MODIS data in the Western Mediterranean Sea

Pieri

Massi

Lazzara

et al. 2015

European Journal of Remote Sensing

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Three algorithms based on MODIS imagery were evaluated for the estimation of Chlorophyll-a concentration ([CHL]) in the Western Mediterranean Sea. The first algorithm (OC3M) is usually applied at global scale, while the second (MedOC3), has been used in the Mediterranean basin. The third algorithm (SAM_LT), specifically developed for the Ligurian and North Tyrrhenian Seas, is here described and applied, in its updated version. The three algorithms were assessed through comparison with 240 sea [CHL] samples collected during the 2002-2011 decade. The results obtained show that OC3M is the most accurate algorithm when used for the entire Western Mediterranean, but is outperformed by SAM_LT in the area where this was originally developed. The impact of different MODIS quality flags on the three algorithms has been finally evaluated, providing guidelines for their operational application in the study area.

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Preliminary assessment of eutrophication by remotely sensed chlorophyll-a in Toyama Bay, the Sea of Japan

Cited by 24 publications

References 21 publications

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Assessment of three algorithms for the operational estimation of [CHL] from MODIS data in the Western Mediterranean Sea

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