ORCID Profile
0000-0003-0274-6642
Current Organisations
German Cancer Research Center
,
Wolfgang Goethe University
,
Heidelberg University Hospital
,
Universities of Giessen and Marburg Lung Center; Member of the German Center for Lung Research (DZL); Justus-Liebig-University of Giessen
,
National Institute of Polar Research
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Publications
Spatial and geographical changes in the mesozooplankton community in the Bering and Chukchi Seas during the summers of 2007 and 2008
Publisher: Elsevier BV
Date: 09-2016
Changes in phytoplankton community structure during wind-induced fall bloom on the central Chukchi shelf
Publisher: Springer Science and Business Media LLC
Date: 20-02-2018
Using under-ice hyperspectral transmittance to determine land-fast sea-ice algal biomass in Saroma-ko Lagoon, Hokkaido, Japan
Publisher: Cambridge University Press (CUP)
Date: 24-09-2020
DOI: 10.1017/AOG.2020.69
Abstract: Sea ice, which forms in polar and nonpolar areas, transmits light to ice-associated (sympagic) algal communities. To noninvasively study the distribution of sea-ice algae, empirical relations to estimate its biomass from under-ice hyperspectral irradiance have been developed in the Arctic and Antarctica but lack for nonpolar regions. This study examines relationships between normalised difference indices (NDI) calculated from hyperspectral transmittance and sympagic algal biomass in the nonpolar Saroma-ko Lagoon. We analysed physico-biogeochemical properties of snow and land-fast sea ice supporting 27 paired bio-optical measurements along three transects covering an area of over 250 m × 250 m in February 2019. Snow depth (0.08 ± 0.01 m) and ice-bottom brine volume fraction (0.21 ± 0.02) showed low (0.06) and high (0.58) correlations with sea-ice core bottom section chlorophyll a (Chl. a ), respectively. Spatial analyses unveiled the patch size of sea-ice Chl. a to be ~65 m, which is in the same range reported from previous studies. A selected NDI (669, 596 nm) explained 63% of algal biomass variability. This reflects the bio-optical properties and environmental conditions of the lagoon that favour the wavelength pair in the orange/red part of the spectrum and suggests the necessity of a specific bio-optical relationship for Saroma-ko Lagoon.
Between-year comparison of interactions between environmental parameters and various plankton stocks in the northern Bering Sea during the summers of 2017 and 2018
Publisher: Elsevier BV
Date: 03-2021
Skin cancer classification via convolutional neural networks: systematic review of studies involving human experts
Publisher: Elsevier BV
Date: 10-2021
Evidence of increased toxic Alexandrium tamarense dinoflagellate blooms in the eastern Bering Sea in the summers of 2004 and 2005
Publisher: Public Library of Science (PLoS)
Date: 28-11-2017
Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data
Publisher: Elsevier BV
Date: 03-2019
Abundance, development stage, and size of decapod larvae through the Bering and Chukchi Seas during summer
Publisher: Springer Science and Business Media LLC
Date: 27-03-2017
Reproductive success of Pacific copepods in the Arctic Ocean and the possibility of changes in the Arctic ecosystem
Publisher: Springer Science and Business Media LLC
Date: 14-02-2015
Year-to-year changes of the mesozooplankton community in the Chukchi Sea during summers of 1991, 1992 and 2007, 2008
Publisher: Springer Science and Business Media LLC
Date: 16-03-2011
An assessment of phytoplankton primary productivity in the Arctic Ocean from satellite ocean color/in situ chlorophyll‐a based models
Publisher: American Geophysical Union (AGU)
Date: 09-2015
DOI: 10.1002/2015JC011018
Possible spreading of toxic Alexandrium tamarense blooms on the Chukchi Sea shelf with the inflow of Pacific summer water due to climatic warming
Publisher: Elsevier BV
Date: 2017
East-west differences in population structure and vertical distribution of copepods along 47°N in the subarctic Pacific in June 2009
Publisher: The Plankton Society of Japan/The Japanese Association of Benthology
Date: 2014
DOI: 10.3800/PBR.8.116
Related Organisations
Universities Of Giessen And Marburg Lung Center; Member Of The German Center For Lung Research (DZL); Justus-Liebig-University Of Giessen
Location: Germany
Related Funding Activities
No related grants have been discovered for Toru Hirawake.