(Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012
A more than two-decadal sediment trap record from the Eastern Boundary Upwelling Ecosystem (EBUE) off Cape Blanc, Mauritania, is analysed with respect to deep ocean mass fluxes, flux components and their variability on seasonal to decadal timescales. The total mass flux revealed interannual fluctuat...
Main Authors: | , , , , , , , , , |
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Format: | Dataset |
Language: | English |
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PANGAEA
2016
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Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.867251 https://doi.org/10.1594/PANGAEA.867251 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.867251 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Biogenic silica flux at time interval Calcium carbonate flux of total flux Cape Blanc Carbon organic CB1_trap CB11 CB12 CB12_trap CB13 CB13_trap CB14 CB15 CB16 CB17 CB17_trap CB18 CB18_trap CB19 CB2_trap CB20 CB21 CB22 CB3_trap CB4_trap CB5_trap CB6 CB7 CB7_trap CB8 CB9_trap Center for Marine Environmental Sciences Comment Date DATE/TIME Date/time end DEPTH water |
spellingShingle |
Biogenic silica flux at time interval Calcium carbonate flux of total flux Cape Blanc Carbon organic CB1_trap CB11 CB12 CB12_trap CB13 CB13_trap CB14 CB15 CB16 CB17 CB17_trap CB18 CB18_trap CB19 CB2_trap CB20 CB21 CB22 CB3_trap CB4_trap CB5_trap CB6 CB7 CB7_trap CB8 CB9_trap Center for Marine Environmental Sciences Comment Date DATE/TIME Date/time end DEPTH water Fischer, Gerhard Romero, Oscar E Merkel, Ute Donner, Barbara Iversen, Morten Hvitfeldt Nowald, Nicolas Ratmeyer, Volker Ruhland, Götz Klann, Marco Wefer, Gerold (Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 |
topic_facet |
Biogenic silica flux at time interval Calcium carbonate flux of total flux Cape Blanc Carbon organic CB1_trap CB11 CB12 CB12_trap CB13 CB13_trap CB14 CB15 CB16 CB17 CB17_trap CB18 CB18_trap CB19 CB2_trap CB20 CB21 CB22 CB3_trap CB4_trap CB5_trap CB6 CB7 CB7_trap CB8 CB9_trap Center for Marine Environmental Sciences Comment Date DATE/TIME Date/time end DEPTH water |
description |
A more than two-decadal sediment trap record from the Eastern Boundary Upwelling Ecosystem (EBUE) off Cape Blanc, Mauritania, is analysed with respect to deep ocean mass fluxes, flux components and their variability on seasonal to decadal timescales. The total mass flux revealed interannual fluctuations which were superimposed by fluctuations on decadal timescales. High winter fluxes of biogenic silica (BSi), used as a measure of marine production (mostly by diatoms) largely correspond to a positive North Atlantic Oscillation (NAO) index (December-March). However, this relationship is weak. The highest positive BSi anomaly was in winter 2004-2005 when the NAO was in a neutral state. More episodic BSi sedimentation events occurred in several summer seasons between 2001 and 2005, when the previous winter NAO was neutral or even negative. We suggest that distinct dust outbreaks and deposition in the surface ocean in winter and occasionally in summer/autumn enhanced particle sedimentation and carbon export on short timescales via the ballasting effect. Episodic perturbations of the marine carbon cycle by dust outbreaks (e.g. in 2005) might have weakened the relationships between fluxes and large-scale climatic oscillations. As phytoplankton biomass is high throughout the year, any dry (in winter) or wet (in summer) deposition of fine-grained dust particles is assumed to enhance the efficiency of the biological pump by incorporating dust into dense and fast settling organic-rich aggregates. A good correspondence between BSi and dust fluxes was observed for the dusty year 2005, following a period of rather dry conditions in the Sahara/Sahel region. Large changes of all bulk fluxes occurred during the strongest El Niño-Southern Oscillation (ENSO) in 1997-1999 where low fluxes were obtained for almost 1 year during the warm El Niño and high fluxes in the following cold La Niña phase. For decadal timescales, Bakun (1990) suggested an intensification of coastal upwelling due to increased winds (''Bakun upwelling ... |
format |
Dataset |
author |
Fischer, Gerhard Romero, Oscar E Merkel, Ute Donner, Barbara Iversen, Morten Hvitfeldt Nowald, Nicolas Ratmeyer, Volker Ruhland, Götz Klann, Marco Wefer, Gerold |
author_facet |
Fischer, Gerhard Romero, Oscar E Merkel, Ute Donner, Barbara Iversen, Morten Hvitfeldt Nowald, Nicolas Ratmeyer, Volker Ruhland, Götz Klann, Marco Wefer, Gerold |
author_sort |
Fischer, Gerhard |
title |
(Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 |
title_short |
(Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 |
title_full |
(Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 |
title_fullStr |
(Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 |
title_full_unstemmed |
(Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 |
title_sort |
(table 2) seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site cb from 1988 - 2012 |
publisher |
PANGAEA |
publishDate |
2016 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.867251 https://doi.org/10.1594/PANGAEA.867251 |
op_coverage |
MEDIAN LATITUDE: 21.232309 * MEDIAN LONGITUDE: -20.719252 * SOUTH-BOUND LATITUDE: 20.755000 * WEST-BOUND LONGITUDE: -20.848333 * NORTH-BOUND LATITUDE: 21.300000 * EAST-BOUND LONGITUDE: -19.742000 * DATE/TIME START: 1988-03-22T00:00:00 * DATE/TIME END: 2012-09-12T00:00:00 * MINIMUM DEPTH, water: 745 m * MAXIMUM DEPTH, water: 4168 m |
long_lat |
ENVELOPE(-20.848333,-19.742000,21.300000,20.755000) |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Fischer, Gerhard; Romero, Oscar E; Merkel, Ute; Donner, Barbara; Iversen, Morten Hvitfeldt; Nowald, Nicolas; Ratmeyer, Volker; Ruhland, Götz; Klann, Marco; Wefer, Gerold (2016): Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales. Biogeosciences, 13(10), 3071-3090, https://doi.org/10.5194/bg-13-3071-2016 https://doi.pangaea.de/10.1594/PANGAEA.867251 https://doi.org/10.1594/PANGAEA.867251 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.867251 https://doi.org/10.5194/bg-13-3071-2016 |
_version_ |
1766137123478437888 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.867251 2023-05-15T17:37:17+02:00 (Table 2) Seasonal flux data and percentages of major bulk components of total flux at the mesotrophic sediment trap site CB from 1988 - 2012 Fischer, Gerhard Romero, Oscar E Merkel, Ute Donner, Barbara Iversen, Morten Hvitfeldt Nowald, Nicolas Ratmeyer, Volker Ruhland, Götz Klann, Marco Wefer, Gerold MEDIAN LATITUDE: 21.232309 * MEDIAN LONGITUDE: -20.719252 * SOUTH-BOUND LATITUDE: 20.755000 * WEST-BOUND LONGITUDE: -20.848333 * NORTH-BOUND LATITUDE: 21.300000 * EAST-BOUND LONGITUDE: -19.742000 * DATE/TIME START: 1988-03-22T00:00:00 * DATE/TIME END: 2012-09-12T00:00:00 * MINIMUM DEPTH, water: 745 m * MAXIMUM DEPTH, water: 4168 m 2016-10-26 text/tab-separated-values, 1402 data points https://doi.pangaea.de/10.1594/PANGAEA.867251 https://doi.org/10.1594/PANGAEA.867251 en eng PANGAEA Fischer, Gerhard; Romero, Oscar E; Merkel, Ute; Donner, Barbara; Iversen, Morten Hvitfeldt; Nowald, Nicolas; Ratmeyer, Volker; Ruhland, Götz; Klann, Marco; Wefer, Gerold (2016): Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales. Biogeosciences, 13(10), 3071-3090, https://doi.org/10.5194/bg-13-3071-2016 https://doi.pangaea.de/10.1594/PANGAEA.867251 https://doi.org/10.1594/PANGAEA.867251 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Biogenic silica flux at time interval Calcium carbonate flux of total flux Cape Blanc Carbon organic CB1_trap CB11 CB12 CB12_trap CB13 CB13_trap CB14 CB15 CB16 CB17 CB17_trap CB18 CB18_trap CB19 CB2_trap CB20 CB21 CB22 CB3_trap CB4_trap CB5_trap CB6 CB7 CB7_trap CB8 CB9_trap Center for Marine Environmental Sciences Comment Date DATE/TIME Date/time end DEPTH water Dataset 2016 ftpangaea https://doi.org/10.1594/PANGAEA.867251 https://doi.org/10.5194/bg-13-3071-2016 2023-01-20T09:07:58Z A more than two-decadal sediment trap record from the Eastern Boundary Upwelling Ecosystem (EBUE) off Cape Blanc, Mauritania, is analysed with respect to deep ocean mass fluxes, flux components and their variability on seasonal to decadal timescales. The total mass flux revealed interannual fluctuations which were superimposed by fluctuations on decadal timescales. High winter fluxes of biogenic silica (BSi), used as a measure of marine production (mostly by diatoms) largely correspond to a positive North Atlantic Oscillation (NAO) index (December-March). However, this relationship is weak. The highest positive BSi anomaly was in winter 2004-2005 when the NAO was in a neutral state. More episodic BSi sedimentation events occurred in several summer seasons between 2001 and 2005, when the previous winter NAO was neutral or even negative. We suggest that distinct dust outbreaks and deposition in the surface ocean in winter and occasionally in summer/autumn enhanced particle sedimentation and carbon export on short timescales via the ballasting effect. Episodic perturbations of the marine carbon cycle by dust outbreaks (e.g. in 2005) might have weakened the relationships between fluxes and large-scale climatic oscillations. As phytoplankton biomass is high throughout the year, any dry (in winter) or wet (in summer) deposition of fine-grained dust particles is assumed to enhance the efficiency of the biological pump by incorporating dust into dense and fast settling organic-rich aggregates. A good correspondence between BSi and dust fluxes was observed for the dusty year 2005, following a period of rather dry conditions in the Sahara/Sahel region. Large changes of all bulk fluxes occurred during the strongest El Niño-Southern Oscillation (ENSO) in 1997-1999 where low fluxes were obtained for almost 1 year during the warm El Niño and high fluxes in the following cold La Niña phase. For decadal timescales, Bakun (1990) suggested an intensification of coastal upwelling due to increased winds (''Bakun upwelling ... Dataset North Atlantic North Atlantic oscillation PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-20.848333,-19.742000,21.300000,20.755000) |