AFFINITY OF SAND COLOR INDEX IN RIVERS AND BEACHES AROUND THE KII CHANNEL

Abstract Yasue, N., Doiuchi R., and Takasuka, A. 2013. Trophodynamic similarities of three sympatric clupeoid species throughout their life histories in the Kii Channel as revealed by stable isotope approach. – ICES Journal of Marine Science, 71: . Trophic similarity/difference among multispecies pelagic fish is a focal point in understanding the processes of climate impacts on their population dynamics. We tested trophic overlap of Japanese anchovy Engraulis japonicus, Japanese sardine Sardinops melanostictus, and Pacific round herring Etrumeus teres in the Kii Channel, Japan, by comparing the carbon and nitrogen stable isotope ratios among these clupeoid species from the larval to adult stages throughout the year. Space and time were both significant factors of variations of the isotopic composition values for the three species, and fish size was also significant for sardine and round herring. The isotopic composition values of the three species were homogeneous when compared with those of plankton and some other non-clupeoid species. Moreover, the isotopic composition values of the three clupeoid species collected simultaneously showed closer similarities than those in different areas and dates in all life stages. Thus, spatial and temporal differences in food availability were more apparent compared with interspecific differences in prey items specific to each species. Our analysis indicated strong trophic overlaps throughout the life histories among the three clupeoid species. Hence, they are concluded to be ecologically congeneric (directly competing) species in terms of trophic positions in the pelagic ecosystem.

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Decolorization of Color Index Acid Orange 20 buffer solution using horseradish peroxidase immobilized on modified PAN-beads

RSC Advances ◽

10.1039/c7ra01698k ◽

2017 ◽

Vol 7 (31) ◽

pp. 18976-18986 ◽

Cited By ~ 10

Author(s):

Zhu Yincan ◽

Liu Yan ◽

Guo Xueyong ◽

Wu Qiao ◽

Xu Xiaoping

Keyword(s):

Aqueous Solution ◽

Horseradish Peroxidase ◽

Color Index ◽

Buffer Solution ◽

Acid Orange

In the present work, horseradish peroxidase (HRP) is utilized to be immobilized onto polyacrylonitrile based beads (PAN-beads) for decolorization of Color Index (C. I.) Acid Orange 20 (AO20) in aqueous solution.

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Polar Stratospheric Clouds detection at Belgrano II Antarctic station from DOAS measurements

10.5194/egusphere-egu21-3054 ◽

2021 ◽

Author(s):

Laura Gómez Martín ◽

Daniel Toledo ◽

Margarita Yela ◽

Cristina Prados-Román ◽

José Antonio Adame ◽

...

Keyword(s):

Radiative Transfer ◽

Color Index ◽

Radiative Transfer Model ◽

Optical Absorption Spectroscopy ◽

Transfer Model ◽

Meteorological Model ◽

Weather Forecasts ◽

Stratospheric Temperature ◽

Stratospheric Clouds

Ground-based zenith DOAS (Differential Optical Absorption Spectroscopy) measurements have been used to detect and estimate the altitude of PSCs over Belgrano II Antarctic station during the polar sunrise seasons of 2018 and 2019. The method used in this work studies the evolution of the color index (CI) during twilights. The CI has been defined here as the ratio of the recorded signal at 520 and 420 nm. In the presence of PSCs, the CI shows a maximum at a given solar zenith angle (SZA). The value of such SZA depends on the altitude of the PSC. By using a spherical Monte Carlo radiative transfer model (RTM), the method has been validated and a function relating the SZA of the CI maximum and the PSC altitude has been calculated. Model simulations also show that PSCs can be detected and their altitude can be estimated even in presence of optically thin tropospheric clouds or aerosols. Our results are in good agreement with the stratospheric temperature evolution obtained through the ERA5 data reanalysis from the global meteorological model ECMWF (European Centre for Medium Range Weather Forecasts) and the PSCs observations from CALIPSO (Cloud-Aerosol-Lidar and Infrared Pathfinder Satellite Observations).The methodology used in this work could also be applied to foreseen and/or historical measurements obtained with ground-based spectrometers such e. g. the DOAS instruments dedicated to trace gas observation in Arctic and Antarctic sites. This would also allow to investigate the presence and long-term evolution of PSCs.Keywords: Polar stratospheric clouds; color index; radiative transfer model; visible spectroscopy.

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