Seasonal and spatial variability of sea ice and phytoplankton biomarker flux in the Chukchi sea (western Arctic Ocean)

Bai, Youcheng; Sicre, Marie‐Alexandrine; Chen, Jianfang; Klein, Vincent; Jin, Haiyan; Ren, Jian; Li, Hongliang; Xue, Bin; Ji, Zhongqiang; Zhuang, Yanpei; Zhao, Meixun

doi:10.1016/j.pocean.2018.12.002

Cited by 32 publications

(50 citation statements)

References 88 publications

(109 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Peak IP 25 fluxes during early July 2016 (1331 ng m -2 d -1 ), coincided with the largest flux of the diatom group Gyrosigma/Pleurosigma/Haslea (Fig 2D), which account for~1% of the relative abundance of major diatom taxa groups [49]. This value is higher than maximum values observed in August 2008 and August 2009 in the Chukchi Borderland (46 ng m -2 d -1 and 33 ng m -2 d -1 , respectively) [37]. This is not surprising given that generally shallow Arctic shelves are more productive than the basin and slope regions [11,14].…”

Section: Seasonal Variations Of Hbi and Diatom Export In The Northeasmentioning

confidence: 72%

“…The largest concentration observed (12 μg g -1 TOC), in addition to samples with values exceeding 10 μg g -1 TOC (n = 4), suggest there were localized areas of elevated ice algal export in the Pacific Arctic. One prior study of IP 25 in the Pacific Arctic indicated comparable concentrations (0-5 μg g -1 TOC [37]). However, direct comparisons with our data may be equivocal because of the less productive location further offshore near the Chukchi Borderlands.…”

Section: Latitudinal Gradients Of Sympagic Hbis and Declining Sea Icementioning

confidence: 90%

“…Few HBI studies have been conducted on the productive shallow shelves of the Pacific Arctic marginal seas relative to the Eurasian and Canadian Arctic [22,37]. Therefore, opportunities exist to improve our understanding of the dynamics of these biomarkers and their applications for ecosystem and paleoclimate studies.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal and latitudinal variations in sea ice algae deposition in the Northern Bering and Chukchi Seas determined by algal biomarkers

et al. 2020

View full text Add to dashboard Cite

An assessment of the production, distribution and fate of highly branched isoprenoid (HBI) biomarkers produced by sea ice and pelagic diatoms is necessary to interpret their detection and proportions in the northern Bering and Chukchi Seas. HBIs measured in surface sediments collected from 2012 to 2017 were used to determine the distribution and seasonality of the biomarkers relative to sea ice patterns. A northward gradient of increasing ice algae deposition was observed with localized occurrences of elevated IP 25 (sympagic HBI) concentrations from 68-70˚N and consistently strong sympagic signatures from 71-72.5˚N. A declining sympagic signature was observed from 2012 to 2017 in the northeast Chukchi Sea, coincident with declining sea ice concentrations. HBI fluxes were investigated on the northeast Chukchi shelf with a moored sediment trap deployed from August 2015 to July 2016. Fluxes of sea ice exclusive diatoms (Nitzschia frigida and Melosira arctica) and HBIproducing taxa (Pleurosigma, Haslea and Rhizosolenia spp.) were measured to confirm HBI sources and ice associations. IP 25 was detected year-round, increasing in March 2016 (10 ng m-2 d-1) and reaching a maximum in July 2016 (1331 ng m-2 d-1). Snowmelt triggered the release of sea ice algae into the water column in May 2016, while under-ice pelagic production contributed to the diatom export in June and July 2016. Sea ice diatom fluxes were strongly correlated with the IP 25 flux, however associations between pelagic diatoms and HBI fluxes were inconclusive. Bioturbation likely facilitates sustained burial of sympagic organic matter on the shelf despite the occurrence of pelagic diatom blooms. These results suggest that sympagic diatoms may sustain the food web through winter on the northeast Chukchi shelf. The reduced relative proportions of sympagic HBIs in the northern Bering Sea are likely driven by sea ice persistence in the region.

show abstract

Section: Seasonal Variations Of Hbi and Diatom Export In The Northeasmentioning

confidence: 72%

Section: Latitudinal Gradients Of Sympagic Hbis and Declining Sea Icementioning

confidence: 90%

See 1 more Smart Citation

Seasonal and latitudinal variations in sea ice algae deposition in the Northern Bering and Chukchi Seas determined by algal biomarkers

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Figure 4(B); c=0.17). Since some recently reported sediment trap data from the Chukchi Sea showed that the epi-brassicasterol flux was still relatively high in late summer, while the HBI III flux was reduced in summer compared to spring values (Bai et al 2019), it follows that certain sterols potentially integrate, to some degree, both spring and summer conditions. Accordingly, the major production of IP 25 in sea ice and HBI III in open waters along the sea ice edge during the spring season appear to provide the most reliable biomarker pair for estimating PIP 25 -derived SpSIC in the Chukchi Sea, while the additional use of P B IP 25 may potentially provide complementary insights into subsequent summer sea ice trends.…”

Section: Discussionmentioning

confidence: 99%

Reconstructing spring sea ice concentration in the Chukchi Sea over recent centuries: insights into the application of the PIP₂₅ index

Kim

Gal

Jun

et al. 2019

Environ. Res. Lett.

View full text Add to dashboard Cite

In this study, we aimed to reconstruct spring (April-June) sea ice changes in the western Arctic Ocean over recent centuries (ca. the last 250 years) by measuring biomarker distributions in a multicore (ARA01B-03MUC) retrieved from the Chukchi Shelf region and to evaluate outcomes against known or modelled estimates of sea ice conditions. Specifically, we analyzed for the Arctic sea ice proxy IP 25 and assessed the suitability of a further highly branched isoprenoid (HBI) lipid (HBI III), epibrassicasterol, and dinosterol as complementary biomarkers for use with the so-called phytoplankton marker-IP 25 index (PIP 25 ; P III IP 25 , P B IP 25 , and P D IP 25 , respectively). The presence of IP 25 throughout core ARA01B-03MUC confirms the occurrence of seasonal sea ice at the study site over recent centuries. From a semi-quantitative perspective, all three PIP 25 indices gave different trends, with some dependence on the balance factor c, a term used in the calculation of the PIP 25 index. P III IP 25 -derived spring sea ice concentration (SpSIC) estimates using a c value of 0.63, determined previously from analysis of Barents Sea surface sediments, were likely most reliable, since SpSIC values were high throughout the record (SpSIC >78%), consistent with the modern context for the Chukchi Sea and the mean SpSIC record of the 41 CMIP5 climate models over recent centuries. P B IP 25 -based SpSIC estimates were also high (SpSIC 108%−127%), albeit somewhat over-estimated, when using a c value of 0.023 obtained from a pan-Arctic distribution of surface sediments. In contrast, P D IP 25 values using a pan-Arctic c value of 0.11, and PIP 25 data based on the mean biomarker concentrations from ARA01B-03MUC, largely underestimated sea ice conditions (SpSIC as low as 13%), and exhibited poor agreement with instrumental records or model outputs. On the other hand, P B IP 25 values using a c factor based on mean IP 25 and epi-brassicasterol concentrations exhibited a decline towards the core top, which resembled recent decreasing changes in summer sea ice conditions for the Chukchi Sea; however, further work is needed to test the broader spatial generality of this observation.

show abstract

“…Long-term sediment traps have been deployed to monitor POC fluxes in areas of the western Arctic Ocean, such as the Laptev Sea, Beaufort Sea, Chukchi Sea, and Canada Basin (O'Brien et al, 2006;Fahl and Nöthig, 2007;Forest et al, 2007;Hwang et al, 2008;Lalande et al, 2009aLalande et al, ,b, 2020Honjo et al, 2010;Watanabe et al, 2014;Miquel et al, 2015;Bai et al, 2019). In the Laptev Sea, where sea ice has decreased by 40% over 20 years, the continuous decrease in sea ice has enhanced POC export, potentially altering the structure of the marine ecosystem (Lalande et al, 2009b).…”

Section: Introductionmentioning

confidence: 99%

Temporal and Spatial Variations in Particle Fluxes on the Chukchi Sea and East Siberian Sea Slopes From 2017 to 2018

Kim

Yang

et al. 2021

Front. Mar. Sci.

View full text Add to dashboard Cite

Time-series sediment traps were deployed on the Chukchi Sea and East Siberian Sea slopes from August 2017 to August 2018 with the aim of elucidating the temporal and spatial variations in particle fluxes and identifying the main processes affecting those variations. Particle fluxes showed a typical seasonal pattern, with high values in summer and low values in other seasons, and a large inter-annual variation was observed only on the East Siberian Sea slope, where particle fluxes were one order of magnitude higher in early August 2018 than in late August 2017. This large inter-annual variation in particle flux resulted from the episodic intrusion of nutrient-enriched shelf water in the East Siberian Sea, which enhanced biological production at the surface and particle fluxes. The Chukchi Sea slope was influenced by the inflow of Anadyr Water, with high salinity and high nutrient concentrations, which had little annual variability. Therefore, particle flux showed little inter-annual variation on the Chukchi Sea slope. Under-ice phytoplankton blooms were observed in both the Chukchi Sea and East Siberian Sea slopes, and increases in particulate organic carbon (POC) flux and the C:N ratio under the sea ice were related to transparent exopolymer (TEP) production by ice algae. On the East Siberian Sea slope, particle fluxes increased slightly from 115 to 335 m, indicating lateral transport of suspended particulate matter; POC and lithogenic particles may be laterally transported to the slope as nutrient-rich shelf waters flowed from the East Siberian Sea to the Makarov Basin. Annual POC fluxes were 2.3 and 2.0 g C m–2 year–1 at 115 and 335 m, respectively, on the East Siberian Sea slope and was 2.1 g C m–2 year–1 at 325 m on the Chukchi Sea slope. Annual POC fluxes were higher on the Chukchi Sea and East Siberian Sea slopes than in Arctic basins, lower than on Arctic shelves, and generally similar to those on western Arctic slopes.

show abstract

Seasonal and spatial variability of sea ice and phytoplankton biomarker flux in the Chukchi sea (western Arctic Ocean)

Cited by 32 publications

References 88 publications

Seasonal and latitudinal variations in sea ice algae deposition in the Northern Bering and Chukchi Seas determined by algal biomarkers

Seasonal and latitudinal variations in sea ice algae deposition in the Northern Bering and Chukchi Seas determined by algal biomarkers

Reconstructing spring sea ice concentration in the Chukchi Sea over recent centuries: insights into the application of the PIP₂₅ index

Temporal and Spatial Variations in Particle Fluxes on the Chukchi Sea and East Siberian Sea Slopes From 2017 to 2018

Contact Info

Product

Resources

About

Seasonal and spatial variability of sea ice and phytoplankton biomarker flux in the Chukchi sea (western Arctic Ocean)

Cited by 32 publications

References 88 publications

Seasonal and latitudinal variations in sea ice algae deposition in the Northern Bering and Chukchi Seas determined by algal biomarkers

Seasonal and latitudinal variations in sea ice algae deposition in the Northern Bering and Chukchi Seas determined by algal biomarkers

Reconstructing spring sea ice concentration in the Chukchi Sea over recent centuries: insights into the application of the PIP25 index

Temporal and Spatial Variations in Particle Fluxes on the Chukchi Sea and East Siberian Sea Slopes From 2017 to 2018

Contact Info

Product

Resources

About

Reconstructing spring sea ice concentration in the Chukchi Sea over recent centuries: insights into the application of the PIP₂₅ index