Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes
Tropical oceans provide a benchmark for future primary productivity in increasingly warmer, stratified and nutrient-depleted waters. In this context, we assess the export fluxes of calcifying phytoplankton (coccolithophores) across the tropical North Atlantic, from upwelling affected NW Africa, via...
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ftzenodo:oai:zenodo.org:3831494 2024-09-15T18:22:53+00:00 Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes Guerreiro, Catarina.V. Baumann, Karl-Heinz Brummer, Geert-Jan A. Korte, Laura F. Sá, Carolina Stuut, Jan-Berend W. 2018-08-17 https://doi.org/10.1016/j.pocean.2019.102140 ang ang Zenodo https://zenodo.org/communities/eu https://doi.org/10.1016/j.pocean.2019.102140 oai:zenodo.org:3831494 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Progress in Oceanography, 176, ????????????????????????102140, (2018-08-17) info:eu-repo/semantics/article 2018 ftzenodo https://doi.org/10.1016/j.pocean.2019.102140 2024-07-27T04:34:30Z Tropical oceans provide a benchmark for future primary productivity in increasingly warmer, stratified and nutrient-depleted waters. In this context, we assess the export fluxes of calcifying phytoplankton (coccolithophores) across the tropical North Atlantic, from upwelling affected NW Africa, via three ocean sites along 12°N to the Caribbean. Sampling was undertaken by means of a spatial array of four time-series sediment traps collecting particle fluxes in two-week intervals, from October 2012 to February 2014, allowing to track temporal changes along the southern margin of the North Atlantic central gyre. Species composition and seasonal export fluxes of coccolithophores show steep gradients in two groups. Upper photic zone (UPZ) and placolith-bearing species dominated byEmiliania huxleyiandGephyrocapsa oceanicaare most abundant in the mesotrophic surface waters of the Cape Blanc upwelling system offNW Africa. They decline gradually towards the Caribbean, paralleled by increasing surface temperatures and decreasing surface chlorophyll-a. Meanwhile the abundance of lower photic zone (LPZ) speciesFlorisphaera profundaandGladiolithus flabellatusincrease in the same direction, reaching fluxes up to 3–5 times higher in the western end of the transect compared to the UPZ flora in mesotrophic waters. Adapted to low light conditions, the LPZ species follow the geostrophic wind-forced deepening of the thermocline/nutricline westward in ever lower species diversity towards the Caribbean. Temporal changes were marked by weak seasonality in coccolith fluxes at all four sites, modulated by latitudinal migration of the Intertropical Convergence Zone (ITCZ) at the tropical sites M1, M2 and M4, and by spatiotemporal variation in wind-forced upwelling at site CB. A seasonal mismatch was observed between LPZ and UPZ-oligotrophic taxa (i.e.Umbellosphaeraspp.,Rhabdosphaeraspp.) vs. UPZ-opportunistic species (E. huxleyi,G. oceanica) at the western site M4 contrasting with the more similar seasonal patterns amongst all species ... Article in Journal/Newspaper North Atlantic Zenodo Progress in Oceanography 176 102140 |
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Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
Old English |
description |
Tropical oceans provide a benchmark for future primary productivity in increasingly warmer, stratified and nutrient-depleted waters. In this context, we assess the export fluxes of calcifying phytoplankton (coccolithophores) across the tropical North Atlantic, from upwelling affected NW Africa, via three ocean sites along 12°N to the Caribbean. Sampling was undertaken by means of a spatial array of four time-series sediment traps collecting particle fluxes in two-week intervals, from October 2012 to February 2014, allowing to track temporal changes along the southern margin of the North Atlantic central gyre. Species composition and seasonal export fluxes of coccolithophores show steep gradients in two groups. Upper photic zone (UPZ) and placolith-bearing species dominated byEmiliania huxleyiandGephyrocapsa oceanicaare most abundant in the mesotrophic surface waters of the Cape Blanc upwelling system offNW Africa. They decline gradually towards the Caribbean, paralleled by increasing surface temperatures and decreasing surface chlorophyll-a. Meanwhile the abundance of lower photic zone (LPZ) speciesFlorisphaera profundaandGladiolithus flabellatusincrease in the same direction, reaching fluxes up to 3–5 times higher in the western end of the transect compared to the UPZ flora in mesotrophic waters. Adapted to low light conditions, the LPZ species follow the geostrophic wind-forced deepening of the thermocline/nutricline westward in ever lower species diversity towards the Caribbean. Temporal changes were marked by weak seasonality in coccolith fluxes at all four sites, modulated by latitudinal migration of the Intertropical Convergence Zone (ITCZ) at the tropical sites M1, M2 and M4, and by spatiotemporal variation in wind-forced upwelling at site CB. A seasonal mismatch was observed between LPZ and UPZ-oligotrophic taxa (i.e.Umbellosphaeraspp.,Rhabdosphaeraspp.) vs. UPZ-opportunistic species (E. huxleyi,G. oceanica) at the western site M4 contrasting with the more similar seasonal patterns amongst all species ... |
format |
Article in Journal/Newspaper |
author |
Guerreiro, Catarina.V. Baumann, Karl-Heinz Brummer, Geert-Jan A. Korte, Laura F. Sá, Carolina Stuut, Jan-Berend W. |
spellingShingle |
Guerreiro, Catarina.V. Baumann, Karl-Heinz Brummer, Geert-Jan A. Korte, Laura F. Sá, Carolina Stuut, Jan-Berend W. Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
author_facet |
Guerreiro, Catarina.V. Baumann, Karl-Heinz Brummer, Geert-Jan A. Korte, Laura F. Sá, Carolina Stuut, Jan-Berend W. |
author_sort |
Guerreiro, Catarina.V. |
title |
Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
title_short |
Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
title_full |
Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
title_fullStr |
Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
title_full_unstemmed |
Transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
title_sort |
transatlantic gradients in calcifying phytoplankton (coccolithophore) fluxes |
publisher |
Zenodo |
publishDate |
2018 |
url |
https://doi.org/10.1016/j.pocean.2019.102140 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Progress in Oceanography, 176, ????????????????????????102140, (2018-08-17) |
op_relation |
https://zenodo.org/communities/eu https://doi.org/10.1016/j.pocean.2019.102140 oai:zenodo.org:3831494 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1016/j.pocean.2019.102140 |
container_title |
Progress in Oceanography |
container_volume |
176 |
container_start_page |
102140 |
_version_ |
1810462932714127360 |