Polycystine radiolarians in the Greenland-Iceland-Norwegian Seas: Species and assemblage distribution

Cortese, Giuseppe; Bjørklund, Kjell R.; Dolven, Jane K.

doi:10.1080/00364820308466

Cited by 30 publications

(35 citation statements)

References 20 publications

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“…Use of factor analysis allows getting back temperature estimates from the radiolarian micropaleontological data, and then we can compare them with measured oceanographic values. Temperature residuals (estimated minus measured temperature) for every station (Figure 7) vary between −4 and 4 • C. Standard error is ±1.45 • C for depth of 0 m, ±1.17 • C for depth of 100 m, ±1.04 • C for depth of 200 m, which is comparable with estimate of ±1.2 • C by Cortese et al (2003) for the sea surface summer temperature in the Nordic Seas. Error of the estimated temperatures obviously FIGURE 7 | Residuals (estimated minus measured temperature) and standard errors of estimated temperature.…”

Section: Resultssupporting

confidence: 70%

“…Matul and Yushina (1999) found five radiolarian cluster assemblages in the pelagic North Atlantic from the equatorial to subpolar areas. Cortese et al (2003) applied cluster analysis to the radiolarian dataset north of 60 • N in the northwestern North Atlantic and in the Nordic Seas; four clusters of stations reflected main oceanographic provinces. According to cluster analysis by Boltovskoy and Correa (2016), major biogeographic domains in the North Atlantic are Tropical-Subtropical, Transitional, Bi-Subpolar, and Northern Polar.…”

Section: Methodsmentioning

confidence: 99%

“…More recent intervals cannot be used because of occurrence of large climatic shifts in the North Atlantic, e.g., the warming event in the Subpolar Gyre during 1990's, when the sea surface temperature increased on 1.2-1.5 • C (Marzocchi et al, 2015) and the North Atlantic Oscillation index changed from the positive to negative values (Flatau et al, 2003). Bjørklund et al (1998) and Cortese et al (2003) also used old temperature data from the hydrological atlas of Dietrich (1969) arguing that G. Dietrich's records exhibit better oceanographic picture on the surface of the Nordic Seas compared to other sources of hydrological information. …”

Section: Temperature Datasetmentioning

confidence: 99%

“…The number of counted radiolarian tests were at least 300 (rarely 250) specimens per slide. Radiolarian microfauna from the modern sediments of the high-latitude North Atlantic and Nordic Seas comprises ∼100 species (Matul, 1989;Bjørklund et al, 1998;Cortese et al, 2003). A choice of species list for the statistical treatment has followed criteria in Imbrie and Kipp (1971): every taxon must have a content of ≥2% in at least one sample, and be presented in at least 10 samples.…”

Section: Radiolarian Datasetmentioning

confidence: 99%

“…Working statistical procedure in our study is factor analysis. Previous micropaleontological works on the North Atlantic biogeography proved an applicability of the radiolarian study for the reliable definition of major biogeographic provinces and their environmental interpretation using both a description of species assemblages (Nigrini, 1967;Petrushevskaya, 1969;Matul, 1990) and statistical methods (Bjørklund et al, 1998;Cortese et al, 2003;Boltovskoy and Correa, 2016). Our objective is to improve knowledge on the modern radiolarian biogeography in the high-latitude North Atlantic, and to create a statistical base for the following reconstructions of the marine paleoenvironments as paleoenvironmental studies are crucial for understanding of trends and possible environmental cycling in the evolution of the World Ocean natural systems.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Polycystine Radiolarians in Bottom Surface Sediments and Its Relation to Summer Sea Temperature in the High-Latitude North Atlantic

Matul

Mohan

2017

Front. Mar. Sci.

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An objective of the study is to get new biogeographic information on the modern polycystine radiolarians from the high-latitude North Atlantic. The quantitative radiolarian dataset was compiled from publications and own micropaleontological counts from samples of the bottom surface sediments of the North Atlantic north of 40 • N and Nordic Seas. Standard statistical treatment of micropaleontological data by factor analysis reveals five radiolarian assemblages which have their highest load at the specific temperature range in agreement with the oceanographic setting. An occurrence of radiolarian assemblages reflects extension and interaction of the warm North Atlantic and cold Polar/Arctic waters. Radiolarian distribution exhibits good correlation with the climatically averaged summer sea temperature on depth level of 200 m.

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Section: Resultssupporting

confidence: 70%

Section: Methodsmentioning

confidence: 99%

Section: Temperature Datasetmentioning

confidence: 99%

Section: Radiolarian Datasetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Distribution of Polycystine Radiolarians in Bottom Surface Sediments and Its Relation to Summer Sea Temperature in the High-Latitude North Atlantic

Matul

Mohan

2017

Front. Mar. Sci.

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New northwest Pacific radiolarian data as a tool to estimate past sea surface and intermediate water temperatures

Matsuzaki

Itaki

2017

Paleoceanography

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A new radiolarian data set for transfer function estimates of past sea surface temperature (SST) and intermediate water temperature was developed in this study for the northwestern Pacific Ocean covering a region from 1° to 50°N and 120° to 167°E. We analyzed 87 sediments surface samples, selected 30 species and/or species group found in shallow water for estimating past summer SST and 17 species and/or species group found in the intermediate water for estimating past intermediate water temperature. Since the intermediate water temperature changes greatly between 200 and 500 m, our estimates provide values at 500 m because temperatures are relatively stable between 500 and 1000 m. In this context, we estimated past summer SST and intermediate water (at ~500 m) temperature within an error margin of 0.9 and 1.2°C, respectively. A test of the accuracy of our transfer functions, conducted on core samples provided by IODP Expedition 346 Site U1429 in the northern East China Sea, showed that the reconstructed summer SSTs fluctuated between 17.2 and 26.5°C in selected late Pleistocene sequences. These temperatures corresponded to modern winter and summer SST, respectively, which highlights the ability of our new database to accurately reconstruct summer SST. The reconstructed intermediate water temperature fluctuates between 3 and 8°C, which corresponds to the observed temperature range at depths of ~500 m at high and midlatitudes, respectively.

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Environmental determinants of radiolarian assemblages in the western Pacific since the last deglaciation

Hernández‐Almeida

Cortese

et al. 2017

Paleoceanography

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Radiolarians are a very diverse microzooplanktonic group, often distributed in regionally restricted assemblages and responding to specific environmental factors. These properties of radiolarian assemblages make the group more conducive for the development and application of basin‐wide ecological models. Here we use a new surface sediment data set from the western Pacific to demonstrate that ecological patterns derived from basin‐wide open‐ocean data sets cannot be transferred on semirestricted marginal seas. The data set consists of 160 surface sediment samples from three tropical‐subtropical regions (East China Sea, South China Sea, and western Pacific), combining 54 new assemblage counts with taxonomically harmonized data from previous studies. Multivariate statistical analyses indicate that winter sea surface temperature at 10 m depth (SSTw) was the most significant environmental variable affecting the composition of radiolarian assemblages, allowing the development of an optimal calibration model (Locally Weighted‐Weighted Averaging regression inverse deshrinking, R2cv = 0.88, root‐mean‐square error of prediction = 1.6°C). The dominant effect of SSTw on radiolarian assemblage composition in the western Pacific is attributed to the East Asian Winter Monsoon (EAWM), which is particularly strong in the marginal seas. To test the applicability of the calibration model on fossil radiolarian assemblages from the marginal seas, the calibration model was applied to two downcore records from the Okinawa Trough, covering the last 18 ka. We observe that these assemblages find most appropriate analogs among modern samples from the marginal basins (East China Sea and South China Sea). Downcore temperature reconstructions at both sites show similarities to known regional SST reconstructions, providing proof of concept for the new radiolarian‐based SSTw calibration model.

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Polycystine radiolarians in the Greenland-Iceland-Norwegian Seas: Species and assemblage distribution

Cited by 30 publications

References 20 publications

Distribution of Polycystine Radiolarians in Bottom Surface Sediments and Its Relation to Summer Sea Temperature in the High-Latitude North Atlantic

Distribution of Polycystine Radiolarians in Bottom Surface Sediments and Its Relation to Summer Sea Temperature in the High-Latitude North Atlantic

New northwest Pacific radiolarian data as a tool to estimate past sea surface and intermediate water temperatures

Environmental determinants of radiolarian assemblages in the western Pacific since the last deglaciation

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