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  • 1
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    Water-mass control on phytoplankton spatiotemporal variations (2018)
    PANGAEA
    In:  Supplement to: Bi, Rong; Chen, Xi; Zhang, Jing; Ishizaka, Joji; Zhuang, Yanpei; Jin, Haiyan; Zhang, Hailong; Zhao, Meixun (2018): Water Mass Control on Phytoplankton Spatiotemporal Variations in the Northeastern East China Sea and the Western Tsushima Strait Revealed by Lipid Biomarkers. Journal of Geophysical Research: Biogeosciences, 123(4), 1318-1332, https://doi.org/10.1002/2017JG004340
    Details
    Publication Date: 2023-11-07
    Description: Continental margin ecosystems in the western North Pacific Ocean are subject to strong climate forcing and anthropogenic impacts. To evaluate mechanisms controlling phytoplankton biomass and community structure variations in marginal sea-open ocean boundary regions, brassicasterol, dinosterol and C37 alkenones were measured in suspended particles in summer and autumn from 2012 to 2013 in the northeastern East China Sea and the western Tsushima Strait (NEECS-WTS). In summer, the concentrations of brassicasterol (40 - 1535 ng L-1) and dinosterol (4.2 - 94 ng L-1) were higher in the southwest of Cheju Island, while C37 alkenones (0 - 30 ng L-1) were higher in the south of Cheju Island. In autumn, brassicasterol (12 - 106 ng L-1), dinosterol (2.4 - 21 ng L-1) and C37 alkenones (0.7 - 7.0 ng L-1) were higher in the southwest of Cheju Island and the WTS, and higher C37 alkenones also occurred in the Okinawa Trough. Correlation analysis of biomarkers and environmental conditions (temperature, salinity and inorganic nutrient concentrations) clearly demonstrated that phytoplankton biomass and community structure variations can be well elucidated by water masses as indexed by temperature and salinity. High nutrients from the Changjiang River were the main cause of high biomass in summer, while nutrients from subsurface water were likely the key factor regulating phytoplankton biomass in open ocean water stations in autumn. This study indicates that mechanisms controlling phytoplankton biomass in marginal sea-open ocean boundary regions should be classified by various water masses with different nutrient concentrations, instead of by geography.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 2
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    (Figure 6) Physical oceanography and nutrients across the water column in the northeastern East China Sea and the western Tsushima Strait (2018)
    PANGAEA
    Details
    Publication Date: 2023-11-07
    Keywords: Chlorophyll a; DEPTH, water; East China Sea; ECS_1; ECS_11; ECS_12; ECS_13; ECS_14; ECS_17; ECS_18; ECS_2; ECS_22; ECS_23; ECS_24; ECS_3; ECS_7; ECS_8; ECS_9; Event label; Japan Sea; Latitude of event; Longitude of event; MULT; Multiple investigations; Nitrogen, inorganic, dissolved; Phosphorus, inorganic, dissolved; Salinity; Silicon; Temperature, water; Yellow Sea
    Type: Dataset
    Format: text/tab-separated-values, 862 data points
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    DATA PANGAEA
  • 3
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    (Figure 5) Temperature, salinity and density across the water column in the northeastern East China Sea and the western Tsushima Strait (2018)
    PANGAEA
    Details
    Publication Date: 2023-11-07
    Keywords: Density, sigma-theta (0); DEPTH, water; East China Sea; ECS_1; ECS_11; ECS_12; ECS_13; ECS_14; ECS_17; ECS_18; ECS_2; ECS_22; ECS_23; ECS_24; ECS_3; ECS_7; ECS_8; ECS_9; Event label; Japan Sea; Latitude of event; Longitude of event; MULT; Multiple investigations; Salinity; Temperature, water, potential; Yellow Sea
    Type: Dataset
    Format: text/tab-separated-values, 7950 data points
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    DATA PANGAEA
  • 4
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    (Figure 2-4) Physical oceanography, nutrients and lipid biomarkers in surface waters of the northeastern East China Sea and the western Tsushima Strait (2018)
    PANGAEA
    Details
    Publication Date: 2023-11-07
    Keywords: 24-Methylcholesta-5,22E-dien-3beta-ol of water; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol of water; Alkenones/lipid biomarkers ratio; Alkenones of water; Brassicasterol/lipid biomarkers ratio; Chlorophyll a; Dinosterol/lipid biomarkers ratio; East China Sea; ECS_1; ECS_11; ECS_12; ECS_13; ECS_14; ECS_17; ECS_18; ECS_2; ECS_22; ECS_23; ECS_24; ECS_3; ECS_7; ECS_8; ECS_9; ECS_A07; ECS_B2; ECS_Buoy-1; ECS_Buoy-2; ECS_CK-10; ECS_CK-3; ECS_CK-6; ECS_F06; ECS_F07; ECS_F08; ECS_F09; ECS_F10; ECS_F11; ECS_F12; ECS_FP01; ECS_FP02; ECS_FP03; ECS_FP04; ECS_FP06; ECS_GN-1; ECS_GN-5; ECS_GS-2; ECS_GS-6; ECS_GW-2; ECS_GW-7; ECS_HR10; ECS_HR11; ECS_HR2; ECS_HR6; ECS_HR8; ECS_HR9; ECS_I-2; ECS_LS1; ECS_LS2; ECS_MC1; ECS_MC4; ECS_MT4; ECS_MT5; ECS_P07; ECS_P08; ECS_P09; ECS_P11; ECS_TE-2; ECS_TE-5; ECS_TE-8; ECS_TW-1; ECS_TW-3; ECS_TW-6; ECS_YS1; ECS_YS2; ECS_Z3; Event label; Japan Sea; Latitude of event; Longitude of event; MULT; Multiple investigations; Nitrogen, inorganic, dissolved; Phosphorus, inorganic, dissolved; Salinity; Season; Silicon; Sum lipid biomarkers of water; Temperature, water; Yellow Sea
    Type: Dataset
    Format: text/tab-separated-values, 867 data points
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    DATA PANGAEA
  • 5
    Electronic Resource
    Electronic Resource
    Preface (1999)
    Springer
    Journal of oceanography 55 (1999), S. 643-643 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007899610048
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Overview of NOPACCS (Northwest Pacific Carbon Cycle Study) (1999)
    Springer
    Journal of oceanography 55 (1999), S. 645-653 
    Details
    ISSN: 1573-868X
    Keywords: North Pacific ; carbon cycle ; biological pump ; intermediate water ; anthropogenic carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Northwest Pacific Carbon Cycle Study (NOPACCS) was a program aimed at investigating the carbon cycle of the North Pacific Ocean, which can be thought of as a large reservoir of carbon dioxide. NOPACCS was also aimed at estimating the North Pacific's capacity as a carbon sink. Project design, scientific results, and data availability, and subsequent projects resulting from this project are also described in this review. Studies of the upper ocean processes focused on the latitudinal differences in the fugacity of carbon dioxide; and on the detail of plankton community structures. Intermediate water was studied in relation to the formation of North Pacific Intermediate Water and the amount of accumulated anthropogenic carbon. The sedimentation process, past carbon cycle and coral reefs were also studied during the project. A preliminary, overall view of the carbon cycle of the North Pacific was drawn from the results of the project and compared to global values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007803826886
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Resting spore formation ofLeptocylindrus danicus (Bacillariophyceae) during short time-scale upwelling and its significance as predicted by a simple model (1987)
    Springer
    Ecological research 2 (1987), S. 229-242 
    Details
    ISSN: 1440-1703
    Keywords: Bacillariophyceae ; Leptocylindrus danicus ; Resting spore ; Time-scale ; Upwelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Resting spore formation during short time-scale upwelling and its significance were investigated in the field and by a simple theoretical model. Field observations of spore formation ofLeptocylindrus danicus were made off Izu Peninsula, Japan. A rapid increase in ratio of resting spore to vegetative cell numbers indicated thatL. danicus formed resting spores quickly as a response to nutrient depletion in the upwelled water, although only a very low number of resting spores was found in the upwelling. A simple model was constructed to investigate the possible advantages of spore formation during short time-scale upwelling. This showed that there is a critical time-scale for resting spore formation to be advantageous. The nutrient depletion period of the upwelling off Izu was shorter than the critical time-scale determined by the model. Rapid-sinking of resting spores may increase further the critical time-scale, unless spores return with upwelling water. For short time-scale upwelling, the vegetative cell may be better suited than the resting spore for enduring a short period of nutrient depletion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349776
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of temporal and spatial variability of phytoplankton by physical-biological models (1991)
    Springer
    Journal of oceanography 47 (1991), S. 226-239 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract I reviewed my research on analysis of temporal and spatial variability of phytoplankton by physical-biological models. This paper was prepared for a lecture of the member awarded the Okada Prize for 1991 from the Oceanographical Society of Japan. Temporal change of phytoplankton in a local upwelling was studied by simulated upwelling experiments conducted with natural phytoplankton communities under natural surface light conditions. Results of the culture experiments was explained by a simple model. This model allows to predict the chlorophyll and nutrient concentration changes in a given upwelled water mass. Above model was verified by a local upwelling observed off Izu, Japan, on May, 1982. Phytoplankton growth and nutrient decrease in surface water of the local upwelling were observed within two days followed by decrease of phytoplankton concentration under depleted nutrient environment. The phytoplankton growth and nutrient decrease could explained by the model with phytoplankton removal rate of about half of the growth rate. Centric diatom was the dominant phytoplankton group and pennate diatom showed less abundance in the upwelled water. Pennate diatom showed fast growth rate when nutrient was abundant and fast decreasing rate after nutrient depleted. On the other hand, flagellate and monads showed relatively slow change of biomass under the change of nutrient concentrations. Furthermore, resting spore formation of centric diatom,Leptocylindrus danicus, was observed in a response to nutrient depletion. Temporal and spatial variability of phytoplankton in the southeastern U.S. continental shelf ecosystem was studied by physical-biological models. First, differences of the biological responses to frontal eddy upwelling during spring and to intrusion during summer was considered by Lagrangian particle tracing experiments with optimally-interpolated flow fields. In spring, particles showed residence time of a few days; however, particles in summer intrusion stayed on the shelf nearly 30 days. It was concluded that difference of particle residence time of upwelled water make the difference of plankton communities. Similar flow fields and particle tracing experiments were used to trace the features in chlorophyll distributions during spring of 1980 derived by Coastal Zone Color Scanner (CZCS). Phytoplankton patchness were created and deformed by frontal eddy events. Eularian physical-biological model was constructed to understand the CZCS-chlorophyll distributions. Statistical comparisons with series of numerical experiments indicate that horizontal advection is an important process for the chlorophyll distributions and that upwelling and associated phytoplankton growth are responsible for the across-shelf gradients and maintenance of concentrations. Furthermore, the CZCS data were assimilated to the model to improve the phytoplankton concentrations, and phytoplankton carbon flux across shelf was estimated. Processes causing the time changes of chlorophyll concentrations were estimated with the model and satellite data further indicated that the both physical and biological forcing is important for the time chages. Several other studies conducted presently were mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310038
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  • 9
    Electronic Resource
    Electronic Resource
    Latitudinal and Vertical Distributions of Phytoplankton Absorption Spectra in the Central North Pacific during Spring 1994 (1999)
    Springer
    Journal of oceanography 55 (1999), S. 667-679 
    Details
    ISSN: 1573-868X
    Keywords: Phytoplankton absorption spectra ; pigment ; package effect ; North Pacific ; subarctic ; Kuroshio ; subtropical ; equatorial Pacific ; subsurface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Vertical changes of phytoplankton absorption spectra along 175°E from 48°N to 15°S were examined during spring 1994. The absorption spectra were analyzed using three different approaches; averaging the spectra within same oceanic areas, EOF analysis, and multiple regression analysis. Average spectra showed differences in five oceanic areas; subarctic, Kuroshio, subtropical surface, equatorial surface, and subtropical and equatorial subsurface areas. The distributions of the EOF mode of the variance of absorption spectra and of the pigments estimated by the multiple regression analysis indicated consistent differences of the spectra between those areas. Kuroshio water contains highest chlorophyll a concentrations and low chlorophyll-a-specific absorption spectra, and this may be caused by the package effect with large phytoplankton cell and by low concentrations of photo-protected carotenoids. Subtropical and equatorial subsurface water showed high absorption at 480 nm and indicated the effects of chlorophyll b. Absorption of the subsurface phytoplankton also showed a shift of the blue peak, possibly caused by the presence of divinyl-chlorophyll a. The consistency of the three different analytical methods indicates that the phytoplankton absorption includes significant information on pigment composition along a north-south vertical section of the central North Pacific.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007807911865
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  • 10
    Electronic Resource
    Electronic Resource
    Observations of upwelling around the Izu Peninsula, Japan: May 1982 (1987)
    Springer
    Journal of oceanography 43 (1987), S. 89-103 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hydrographic observations between the Izu Peninsula and Oshima Island, Japan, in May 1982, showed upwelling around the tip of the Peninsula and possibly also in the lee of Oshima Island. The upwelling introduced water as cold as 18
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02111885
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