Spatial Variability of Primary Production and Chlorophyll in the Laptev Sea in August–September

Демидов, А. Б.; Гагарин, В. И.; Арашкевич, Е. Г.; Makkaveev, P. N.; Konyukhov, I. V.; Vorobieva, O. V.; Fedorov, Alexey V.

doi:10.1134/s0001437019050047

Cited by 19 publications

(6 citation statements)

References 36 publications

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“…The East Siberian Sea was characterized by low chlorophyll values decreasing in the south-north direction from 0.44 to 0.03 μg l -1 at the Kolyma transect and from 0.48 to 0.04 μg l -1 at the Indigirka transect. The obtained results on chl-a distribution are consistent with the data reported for the Laptev Sea (Demidov et al, 2019;Demidov et al, 2020) and the East Siberian Sea (Ershova and Kosobokova, 2019) in autumn season.…”

Section: Study Areasupporting

confidence: 91%

Fluorescent signatures of autochthonous dissolved organic matter production in Siberian shelf seas

Drozdova

Krylov²,

Nedospasov³

et al. 2022

Front. Mar. Sci.

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The East Siberian Sea is an area of high biogeochemical activity caused by multiple factors, such as an influence of river runoff, Atlantic, and Pacific waters, formation and melting of sea ice, and internal circulation. Extensive amounts of carbon are accumulated in sub-sea permafrost within the Arctic shelf in East Siberia. Thawing permafrost and resulting microbial decomposition of frozen carbon pool is a potential feedback process affected global climate dynamics. Several studies of dissolved organic carbon (DOC) distribution in the East Siberian Sea have demonstrated untypical for other Arctic shelf seas pronounced non-conservative DOC behavior. Using seawater samples from the 69th cruise of R/V Akademik Mstislav Keldysh conducted in the Laptev and East Siberian seas in September 2017, this study examines the distribution of fluorescent dissolved organic matter (FDOM) along the shelf-crossing transects including the areas affected by the Khatanga, Lena, Indigirka, and Kolyma river runoff. The set of 137 excitation-emission matrices (EEMs), analyzed with Parallel Factor analysis (PARAFAC), was described by a 4-component model demonstrating Tucker’s congruence coefficient above the 0.95 threshold. Spectral characteristics of the resulting components allowed identifying them as well-known humic-like A and C, protein-like B/T, and marine humic-like M fluorophores. Component C1 (A fluorophore) showed a good correlation with salinity for different river plume influenced regions. As well as chromophoric DOM (CDOM) absorption, it can be used as marker of input of terrestrial DOM to the Arctic Ocean. A distinctive feature of the East Siberian Sea shelf waters in comparison with the Laptev Sea is the higher content of the C2 and C4 components, exhibiting protein-like and marine humic-like fluorescence. Component C3 (C fluorophore) which is usually identified as terrestrial-derived material, was found to be produced locally on the East Siberian Sea shelf and in the continental slope region of the Khatanga transect. Destruction of dead algae cells, production of marine biota and dissolved organic matter (DOM) reworking are considered as possible autochthonous FDOM sources in the Siberian shelf seas.

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Section: Study Areasupporting

confidence: 91%

Fluorescent signatures of autochthonous dissolved organic matter production in Siberian shelf seas

Drozdova

Krylov²,

Nedospasov³

et al. 2022

Front. Mar. Sci.

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“…Our data describe particle sedimentation at the end of the productive season when river inflow is moderate (Janout et al., 2020), radiation rapidly declines, primary production and phytoplankton biomass decrease (Demidov et al., 2019), and zooplankton biomass and grazing were low (Arashkevich et al., 2018). Given the scarcity of data for this region, our study provides new insights into the magnitude and composition of the sinking fluxes on the shelf of the Laptev Sea in habitats differentially influenced by the river plumes during the ice‐free period.…”

Section: Discussionmentioning

confidence: 98%

Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

et al. 2021

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The export of organic carbon from the surface to deep-sea layers, resulting from sedimentation of particulate organic matter, is one of the main processes of the global carbon cycle in the ocean and a key factor in regulating the level of CO 2 in the atmosphere (Archer et al., 2000;Siegenthaler et al., 2005). Recently, the processes of sedimentation of matter and the functioning of the "biological pump" in the Arctic have attracted great attention, since in this region the current climate changes are most pronounced (Walsh, 2008). The dynamics of the vertical flux of sedimentary matter and, to a lesser extent, its composition, have been studied in various marine ecosystems of the Arctic Basin over the past decades (

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“…The differences in primary production rates between this and previous studies can be mainly attributed to the spatial and seasonal variations in the KS, LS, and ESS. For example, most of the stations in the LS were located on continental slopes ( Figure 1 ), where an upwelling of nutrient-rich waters at the shelf border is known to enhance primary production [ 62 ]. In the ESS, previous productivity measurements were conducted near the northern Chukchi Sea, which experiences relatively higher primary production at the shelf break due to the transport of nutrient-rich Bering Sea water by the shelf break jet and strong easterly winds promoting an upwelling of nutrient-rich water from the deep Canada Basin [ 37 , 63 , 64 ].…”

Section: Discussionmentioning

confidence: 99%

“…Regarding the seasonality of primary production, several studies have examined this aspect in the Arctic Ocean, including the KS, LS, and ESS [ 37 , 62 , 65 , 66 ]. However, primary production measurements in the KS, LS, and ESS have been scarce and under-sampled to date.…”

Section: Discussionmentioning

confidence: 99%

“…However, the majority of our measurements in this study were conducted farther away from the northern Chukchi Sea (Figure 1). Regarding the seasonality of primary production, several studies have examined this aspect in the Arctic Ocean, including the KS, LS, and ESS [37,62,65,66]. However, primary production measurements in the KS, LS, and ESS have been scarce and under-sampled to date.…”

Section: Comparisons Of Primary Production Rates Between This and Pre...mentioning

confidence: 99%

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Primary Production in the Kara, Laptev, and East Siberian Seas

Kim

et al. 2023

Microorganisms

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Understanding of the primary production of phytoplankton in the Kara Sea (KS), the Laptev Sea (LS), and the East Siberian Sea (ESS) remains limited, despite the recognized importance of phytoplankton in the Arctic Ocean. To address this knowledge gap, we conducted three NABOS (Nansen and Amundsen Basins Observational System) expeditions in 2013, 2015, and 2018 to measure in situ primary production rates using a 13C-15N dual-tracer method and examine their major controlling factors. The main goals in this study were to investigate regional heterogeneity in primary production and derive its contemporary ranges in the KS, LS, and ESS. The daily primary production rates in this study (99 ± 62, 100 ± 77, and 56 ± 35 mg C m−2 d−1 in the KS, LS, and ESS, respectively) are rather different from the values previously reported in each sea mainly because of spatial and regional differences. Among the three seas, a significantly lower primary production rate was observed in the ESS in comparison to those in the KS and LS. This is likely mainly because of regional differences in freshwater content based on the noticeable relationship (Spearman, rs = −0.714, p < 0.05) between the freshwater content and the primary production rates observed in this study. The contemporary ranges of the annual primary production based on this and previous studies are 0.96–2.64, 0.72–50.52, and 1.68–16.68 g C m−2 in the KS, LS, and ESS, respectively. Further intensive field measurements are warranted to enhance our understanding of marine microorganisms and their community-level responses to the currently changing environmental conditions in these poorly studied regions of the Arctic Ocean.

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Spatial Variability of Primary Production and Chlorophyll in the Laptev Sea in August–September

Cited by 19 publications

References 36 publications

Fluorescent signatures of autochthonous dissolved organic matter production in Siberian shelf seas

Fluorescent signatures of autochthonous dissolved organic matter production in Siberian shelf seas

Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

Primary Production in the Kara, Laptev, and East Siberian Seas

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