Remote silicate supply regulates spring phytoplankton bloom magnitude in the Gulf of Maine

Zang, Zhengchen; Ji, Rubao; Liu, Yonggang; Chen, Changsheng; Li, Yun; Li, Siqi; Davis, Cabell S.

doi:10.1002/lol2.10245

Cited by 7 publications

(3 citation statements)

References 59 publications

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“…Seasonal changes in solar radiation, temperature, and nutrient availability are among the main drivers that regulate the size structure, the intracellular pigment composition, and the absorption characteristics of the algal populations (Ciotti et al, 1999;Ciotti et al, 2002;Bricaud et al, 2004;Churilova et al, 2017). The spring bloom in the NWA is dominated by diatoms in all three regions as suggested by the low phytoplankton specific absorption coefficient and high [Fucox] observed during that time (Table 2), in agreement with phytoplankton enumeration carried out at a fixed station on the Scotian Shelf (Casault et al, 2020) and other studies (Trzcinski et al, 2013;Fragoso et al, 2017;Zang et al, 2022). The higher the fucoxanthin concentration, suggesting a high diatom biomass, the lower the phytoplankton-specific absorption in spring (Table 2), with the Scotian Shelf showing the highest abundance of diatoms, followed by the Labrador Sea and the NAB.…”

Section: Phytoplankton Biomass and Absorption In The Northwest Atlanticsupporting

confidence: 87%

Seasonal and decadal variations in absorption properties of phytoplankton and non-algal particulate matter in three oceanic regimes of the Northwest Atlantic

2022

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Seasonal and inter-annual absorption properties of phytoplankton and non-algal particulate matter were studied in relation to phytoplankton biomass, as indexed by chlorophyll-a concentration, and presence of diatoms, as indexed by fucoxanthin concentration, using a 20-year time series of in situ data collected in the Northwest Atlantic. We found significant differences in the spatiotemporal variations of the bio-optical properties for three oceanic regimes: mesotrophic (Scotian Shelf), oligotrophic (Northwest Atlantic Basin, NAB), and subartic (Labrador Sea). The Scotian Shelf and NAB exhibited similar phenology with the spring and autumn blooms associated with low phytoplankton specific absorption, while only relatively high fucoxanthin concentration occurred in spring. The NAB showed a smaller seasonal variation than the Scotian Shelf in agreement with its oceanic conditions. The Labrador Sea showed a single phytoplankton bloom in spring followed by a continuous decrease in biomass the rest of the year. The relationship between phytoplankton absorption coefficient at 443 nm and chlorophyll-a concentration was consistent with other studies with coefficients that were region-dependent. Absorption by non-algal particulate matter remained between 5% and 60% of phytoplankton absorption with a mean of 15%. The slope of the non-algal particulate absorption varied with seasons and regions and appeared to depend on the trophic status with high values (i.e., up to 0.04) occurring during bloom conditions. We also introduced a new index, the phytoplankton apparent absorption wavelength (PAAW), a wavelength-weighted sum of absorption expressed in nanometers that provides information on the phytoplankton biomass and assemblage in a simple manner. Time series analysis of the PAAW revealed a decrease of this property in spring on the Scotian Shelf, NAB, and Labrador Sea and an increase in autumn on the Scotian Shelf and NAB, suggesting a shift in these ecosystems.

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Section: Phytoplankton Biomass and Absorption In The Northwest Atlanticsupporting

confidence: 87%

Seasonal and decadal variations in absorption properties of phytoplankton and non-algal particulate matter in three oceanic regimes of the Northwest Atlantic

2022

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“…Furthermore, the GoM is one of the world’s most dynamic environments, attributed to the diverse physical and biological processes within its waters . Additionally, nourished by cold currents and marked by complex geomorphology, which includes deep basins and shallow banks, this semienclosed sea stands as a biologically productive marine ecosystem …”

Section: Methodsmentioning

confidence: 99%

“…30 Additionally, nourished by cold currents and marked by complex geomorphology, which includes deep basins and shallow banks, this semienclosed sea stands as a biologically productive marine ecosystem. 31 2.2. Land-to-Ocean DOC Flux Model.…”

Section: Study Areamentioning

confidence: 99%

Fates of Terrigenous Dissolved Organic Carbon in the Gulf of Maine

Wei,

Hayes,

et al. 2024

Environ. Sci. Technol.

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A significant amount of organic carbon is transported in dissolved form from soils to coastal oceans via inland water systems, bridging land and ocean carbon reservoirs. However, it has been discovered that the presence of terrigenous dissolved organic carbon (tDOC) in oceans is relatively limited. Therefore, understanding the fates of tDOC in coastal oceans is essential to account for carbon sequestration through land ecosystems and ensure accurate regional carbon budgeting. In this study, we developed a state-of-the-art modeling approach by coupling a land-to-ocean tDOC flux simulation model and a coastal tDOC tracking model to determine the potential fates of tDOC exported from three primary drainage basins in the Gulf of Maine (GoM). According to our findings, over half a year in the GoM, 56.4% of tDOC was mineralized. Biomineralization was responsible for 90% of that amount, with the remainder attributed to photomineralization. Additionally, 37% of the tDOC remained suspended in the GoM, and 6.6% was buried in the marine sediment.

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Trends in Chlorophyll-a Concentration Along the Krishna–Godavari Basin as Observed From MODIS Archives

Nukapothula

Chen

Yunus

et al. 2022

Pure Appl. Geophys.

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Remote silicate supply regulates spring phytoplankton bloom magnitude in the Gulf of Maine

Cited by 7 publications

References 59 publications

Seasonal and decadal variations in absorption properties of phytoplankton and non-algal particulate matter in three oceanic regimes of the Northwest Atlantic

Seasonal and decadal variations in absorption properties of phytoplankton and non-algal particulate matter in three oceanic regimes of the Northwest Atlantic

Fates of Terrigenous Dissolved Organic Carbon in the Gulf of Maine

Trends in Chlorophyll-a Concentration Along the Krishna–Godavari Basin as Observed From MODIS Archives

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