Controls on temporal and spatial variations of phytoplankton pigment distribution in the Northern South China Sea

Ho, Tung‐Yuan; Pan, Xiaoju; Yang, Hsu-Han; George, T.F. Wong; Shiah, Fuh‐Kwo

doi:10.1016/j.dsr2.2015.05.015

Cited by 25 publications

(7 citation statements)

References 35 publications

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“…The phytoplankton in the South China Sea is dominated by dinoflagellates and diatoms [18]. By studying algae in different water bodies, Zhao and others found that the spectral signature of the curve of the spectrum are common to water bodies, and at the same time, due to the low absorption of algae, there is a wide range of maximum reflectance near the wavelength of 560 nm [19].…”

Section: Results and Discussion 6 Chlorophyll-a Concentrationmentioning

confidence: 99%

Strategy for assessment of disaster risk using typhoon hazards modeling based on chlorophyll-a content of seawater

Wu¹,

Huang²,

Bhatti³

et al. 2018

J Wireless Com Network

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With deterioration of the global climate situation, the frequency and uncertainty of typhoons are the major causes of their hazards in tropical coastal regions, both in terms of loss of life and economic damage. Heavy rainfall triggers massive landslides and devastating flash floods, which can entail tremendous damage. In typhoon-affected areas, the key issue is to estimate the disaster zone and to help ships avoid disaster areas in the sea. Existing studies on typhoon disasters are mainly based on the overall wind assessment or the route prediction of the typhoon, with less attention to the detailed impact in different regions along the route. We propose in this paper a new framework to assess regional disaster risk based on chlorophyll-a concentration inversion in seawater. To calculate the concentration of chlorophyll-a, we analyze Landsat-8 satellite images in typhoon weather and normal weather in the same area. The experiments on realistic samples show that our approach has major potential to improve safety via assessing the impact of a typhoon in different regions based on the level of chlorophyll-a concentration.

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Section: Results and Discussion 6 Chlorophyll-a Concentrationmentioning

confidence: 99%

Strategy for assessment of disaster risk using typhoon hazards modeling based on chlorophyll-a content of seawater

Wu¹,

Huang²,

Bhatti³

et al. 2018

J Wireless Com Network

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“…Figure 8 shows the profile distributions of bbp442/bp442 in different seasons in the euphotic layer of the basin regions. Generally, the sea surface bbp442/bp442 values was small in winter and autumn, corresponding to the relatively larger fraction of micro-phytoplankton in surface water in winter and autumn than in the other seasons [36,75]. However, for the 100-m layer, the mean particle size was comparably smaller in winter than in the other seasons, with the largest mean value of bbp442/bp442 (0.0247).…”

Section: Effect Of Zooplankton Grazingmentioning

confidence: 93%

The Relationship between POC Export Efficiency and Primary Production: Opposite on the Shelf and Basin of the Northern South China Sea

Bai

et al. 2018

Sustainability

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Accurate estimation of particulate organic carbon (POC) export efficiency in the euphotic layer is essential to understand the efficiency of the ocean’s biological carbon pump, but field measurements are difficult to conduct and data are sparse. In this study, we investigated the relationship between POC sinking export efficiency and ocean net primary production (NPP) in the euphotic layer of the northern South China Sea (NSCS), with the help of high spatiotemporal coverage satellite-derived NPP. Annual mean POC export efficiency in euphotic zone is 34% for the shelf areas and 24% for the basin of the NSCS in the context of satellite-derived 16-day-composited NPP. Similar to what is generally observed in the global ocean, the POC export efficiency on the shelf areas appears to be strengthened with the increase of NPP. However, in the basin areas, the opposite relationship is observed. That is, the POC export efficiency significantly decreases with the increase of NPP. Seasonal decoupling between NPP and POC export, phytoplankton size structure, grazing by zooplankton, and dissolved organic carbon export might account for the observed negative relationship between the POC export efficiency and NPP in the euphotic layer of basin region. System comparison between shelf and basin would be helpful to promote understanding of the regulation mechanism of POC export in the tropical marginal seas.

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“…The Chl a concentrations measured include both mono‐Chl a and divinyl‐Chl a . The details of the method were described in our previous study (Ho et al ).…”

Section: Methodsmentioning

confidence: 99%

H₂ accumulation and N₂ fixation variation by Ni limitation in Cyanothece

Tuo

Rodriguez

2019

Limnology & Oceanography

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Ni is an essential cofactor in NiFe-uptake hydrogenase, an enzyme regulating H 2 metabolism in diazotrophic cyanobacteria, the major H 2 producers in the surface ocean globally. Here, we investigated the effect of Ni supply on H 2 production and N 2 fixation by using a model marine cyanobacterial diazotroph, Cyanothece. By mediating total dissolved Ni concentrations from 100 to 0.03 nmol L −1 in a trace metal-defined culture medium, we demonstrated that Ni deficiency results in H 2 accumulation, coupled with decreasing Ni quotas, growth rates, and occasionally relatively low N 2 fixation rates. These results indicate that Ni deficiency limits the growth of the Cyanothece to some extent, considerably decreases H 2 uptake by hydrogenase and leads to H 2 accumulation and N 2 fixation variation in the diazotroph. The findings show that Ni availability is a critical factor on controlling H 2 production and N 2 fixation in marine diazotrophic cyanobacteria. The information of Ni bioavailability for diazotrophic cyanobacteria is thus essential to evaluate the importance of Ni for H 2 cycling and N 2 fixation in oceanic surface waters.

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Controls on temporal and spatial variations of phytoplankton pigment distribution in the Northern South China Sea

Cited by 25 publications

References 35 publications

Strategy for assessment of disaster risk using typhoon hazards modeling based on chlorophyll-a content of seawater

Strategy for assessment of disaster risk using typhoon hazards modeling based on chlorophyll-a content of seawater

The Relationship between POC Export Efficiency and Primary Production: Opposite on the Shelf and Basin of the Northern South China Sea

H₂ accumulation and N₂ fixation variation by Ni limitation in Cyanothece

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Controls on temporal and spatial variations of phytoplankton pigment distribution in the Northern South China Sea

Cited by 25 publications

References 35 publications

Strategy for assessment of disaster risk using typhoon hazards modeling based on chlorophyll-a content of seawater

Strategy for assessment of disaster risk using typhoon hazards modeling based on chlorophyll-a content of seawater

The Relationship between POC Export Efficiency and Primary Production: Opposite on the Shelf and Basin of the Northern South China Sea

H2 accumulation and N2 fixation variation by Ni limitation in Cyanothece

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H₂ accumulation and N₂ fixation variation by Ni limitation in Cyanothece