Coupling plankton - sediment trap - surface sediment coccolithophore regime in the North Aegean Sea (NE Mediterranean)

Skampa, Elisavet; Triantaphyllou, Maria; Dimiza, Margarita D.; Gogou, Alexandra; Malinverno, Elisa; Stavrakakis, S.; Parinos, Constantine; Baumann, Karl-Heinz

doi:10.1016/j.marmicro.2019.03.001

Cited by 12 publications

(5 citation statements)

References 63 publications

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“…This is in contrast with the LIA showing deep nutricline (lower surface productivity levels) (Figures 3 and 5), a cold period that one would expect to be favourable to water column mixing and growth of r-strategy taxa E. huxleyi . Comparable results has been recorded in the North Aegean Sea during the last 1500 years (Gogou et al, 2016; Skampa et al, 2019). In particular, in the North Aegean Sea, Gogou et al( 2016) and Skampa et al (2019) recorded periodic occurrence of ‘ E. huxleyi dominance’ intervals indicating strong water column convection coupled with NAO positive shifts, EMT-like events (Incarbona et al, 2016), cool spells and enhanced continental inputs as well.…”

Section: Discussionsupporting

confidence: 71%

“…Comparable results has been recorded in the North Aegean Sea during the last 1500 years (Gogou et al, 2016; Skampa et al, 2019). In particular, in the North Aegean Sea, Gogou et al( 2016) and Skampa et al (2019) recorded periodic occurrence of ‘ E. huxleyi dominance’ intervals indicating strong water column convection coupled with NAO positive shifts, EMT-like events (Incarbona et al, 2016), cool spells and enhanced continental inputs as well. In contrast, the occurrence of F. profunda dominance intervals may be linked to enhanced stratification of the upper water column and warm surface waters, potentially associated with increased lower salinity Black Sea Water intrusion.…”

Section: Discussionsupporting

confidence: 71%

Section: N-ratio and South Adriatic Hydrologymentioning

confidence: 50%

“…calcareous plankton, lipid biomarkers, palynomorphs, stable isotopes, lake levels and speleothems) have shown the occurrence of abrupt climate changes during the Holocene (warmer/colder and drier/wetter periods) at decadal, centennial to millennial time scales in the Mediterranean basin (e.g. Bini et al, 2019;Cisneros et al, 2016;Di Bella et al, 2014;Gogou et al, 2016;Goudeau et al, 2015;Grauel et al, 2013;Jalali et al, 2016Jalali et al, , 2018Kouli et al, 2012;Lirer et al, 2013Lirer et al, , 2014Margaritelli et al, 2016Margaritelli et al, , 2018Piva et al, 2008;Sicre et al, 2016;Skampa et al, 2019;Triantaphyllou et al, 2009Triantaphyllou et al, , 2010Triantaphyllou et al, , 2016b.…”

Section: Introductionmentioning

confidence: 99%

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Climate variability of the last ~2700 years in the Southern Adriatic Sea: Coccolithophore evidences

et al. 2019

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New information on palaeoenvironmental conditions over the past ~2700 years in the Central Mediterranean Sea have been acquired through the high-resolution study of calcareous nannofossils preserved in the sediment core SW104-ND14Q recovered in the Southern Adriatic Sea (SAS) at 1013-m water depth. The surface water properties at this open SAS site are sensitive to atmospheric forcing (acting both at local and regional scale) and the North Ionian Sea driven inflowing waters. Our data show a relationship between reworked coccolith abundances, flood frequency across the Southern Alps and the North Atlantic Oscillation (NAO) confirming their value as indicator of runoff/precipitation. Changes in the abundance of the opportunistic (r-strategist) species Emiliania huxleyi and deep dweller taxa Florisphaera profunda were used to reconstruct the upper water column stratification and associated changes in coccolithophorid productivity. The negative correlation between reworked coccoliths and the N-Ratio ( r = −0.44; p = 6−7) suggest that fresh water induced stratification is a controlling factor of the SAS coccolithophorid production. High coccolithophorid productivity levels occurred during dry periods and/or time intervals of inflowing salty and nutrient-rich Levantine Intermediate Waters favouring convection while lower levels took place during high freshwater discharge, mainly during the ‘Little Ice Age’ and two centennial scale intervals of weakest NAO around 200 BCE and 500 CE.

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Section: Discussionsupporting

confidence: 71%

Section: Discussionsupporting

confidence: 71%

Section: N-ratio and South Adriatic Hydrologymentioning

confidence: 50%

Section: Introductionmentioning

confidence: 99%

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Climate variability of the last ~2700 years in the Southern Adriatic Sea: Coccolithophore evidences

et al. 2019

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“…) is primarily derived from diatoms and Prymnesiophyta, while dinosterol (4αC 30 Δ 22E ) is a major compound in many dinoflagellates (Volkman, 1986). Longchain alkenones are produced by some Prymnesiophyte class, e.g., Emiliania huxleyii (Marlowe et al, 1984) the later constituting the dominant primary producers across the Mediterranean Sea (Ziveri et al, 2000;Triantaphyllou, 2004;Skampa et al, 2019). Long-chain C 30 n-alkan-1,15-diols have been commonly reported in marine and freshwater environments (Versteegh et al, 1997(Versteegh et al, , 2000Rampen et al, 2012;Pedrosa-Pàmies et al, 2015, but little is known about their specific biological sources.…”

Section: Source Indicators Of Sinking Particulate Organic Carbonmentioning

confidence: 99%

Atmospheric and Oceanographic Forcing Impact Particle Flux Composition and Carbon Sequestration in the Eastern Mediterranean Sea: A Three-Year Time-Series Study in the Deep Ierapetra Basin

et al. 2021

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Sinking particles are a critical conduit for the export of organic material from surface waters to the deep ocean. Despite their importance in oceanic carbon cycling, little is known about the biotic composition and seasonal variability of sinking particles reaching abyssal depths. Herein, sinking particle flux data, collected in the deep Ierapetra Basin for a three-year period (June 2010 to June 2013), have been examined at the light of atmospheric and oceanographic parameters and main mass components (lithogenic, opal, carbonates, nitrogen, and organic carbon), stable isotopes of particulate organic carbon (POC) and source-specific lipid biomarkers. Our aim is to improve the current understanding of the dynamics of particle fluxes and the linkages between atmospheric dynamics and ocean biogeochemistry shaping the export of organic matter in the deep Eastern Mediterranean Sea. Overall, particle fluxes showed seasonality and interannual variability over the studied period. POC fluxes peaked in spring April–May 2012 (12.2 mg m−2 d−1) related with extreme atmospheric forcing. Summer export was approximately fourfold higher than mean wintertime, fall and springtime (except for the episodic event of spring 2012), fueling efficient organic carbon sequestration. Lipid biomarkers indicate a high relative contribution of natural and anthropogenic, marine- and land-derived POC during both spring (April–May) and summer (June–July) reaching the deep-sea floor. Moreover, our results highlight that both seasonal and episodic pulses are crucial for POC export, while the coupling of extreme weather events and atmospheric deposition can trigger the influx of both marine labile carbon and anthropogenic compounds to the deep Levantine Sea. Finally, the comparison of time series data of sinking particulate flux with the corresponding biogeochemical parameters data previously reported for surface sediment samples from the deep-sea shed light on the benthic–pelagic coupling in the study area. Thus, this study underscores that accounting the seasonal and episodic pulses of organic carbon into the deep sea is critical in modeling the depth and intensity of natural and anthropogenic POC sequestration, and for a better understanding of the global carbon cycle.

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Two-year seasonality (2017, 2018), export and long-term changes in coccolithophore communities in the subtropical ecosystem of the Gulf of Aqaba, Red Sea

Keuter

Koplovitz²,

Torfstein³

et al. 2023

Deep Sea Research Part I: Oceanographic Research Papers

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Coupling plankton - sediment trap - surface sediment coccolithophore regime in the North Aegean Sea (NE Mediterranean)

Cited by 12 publications

References 63 publications

Climate variability of the last ~2700 years in the Southern Adriatic Sea: Coccolithophore evidences

Climate variability of the last ~2700 years in the Southern Adriatic Sea: Coccolithophore evidences

Atmospheric and Oceanographic Forcing Impact Particle Flux Composition and Carbon Sequestration in the Eastern Mediterranean Sea: A Three-Year Time-Series Study in the Deep Ierapetra Basin

Two-year seasonality (2017, 2018), export and long-term changes in coccolithophore communities in the subtropical ecosystem of the Gulf of Aqaba, Red Sea

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