Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic
It is generally assumed that sinking particulate organic carbon (POC) constitutes the main source of organic carbon supply to the deep ocean's food webs. However, a major discrepancy between the rates of sinking POC supply (collected with sediment traps) and the prokaryotic organic carbon deman...
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Online Access: | http://hdl.handle.net/10553/53076 https://doi.org/10.1029/2010GL043105 |
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ftunivlaspalmas:oai:accedacris.ulpgc.es:10553/53076 2023-05-15T17:35:32+02:00 Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic Baltar González, Federico Aristegui, Javier Sintes, Eva Gasol, Josep M. Reinthaler, Thomas Herndl, Gerhard J. Herndl, Gerhard Baltar, Federico Gasol, Josep M Sintes, Eva Aristegui, Javier Reinthaler, Thomas 23476314200 7006816204 15833225000 7003299234 8368531200 7005513845 1232580 227201 935469 97985 1454644 99734 BU-BAS 2010 application/pdf http://hdl.handle.net/10553/53076 https://doi.org/10.1029/2010GL043105 eng eng Geophysical Research Letters 37 0094-8276 http://hdl.handle.net/10553/53076 doi:10.1029/2010GL043105 2-s2.0-77952161445 77952161445 000277477800001 627452 L09602 B-1513-2013 C-3260-2012 B-1709-2008 H-8494-2015 D-5833-2013 E-6563-2013 Sí by-nc-nd info:eu-repo/semantics/openAccess CC-BY-NC-ND Geophysical Research Letters [ISSN 0094-8276], v. 37 (9), L09602, (Mayo 2010) 251001 Oceanografía biológica Dark CO2 fixation Heterotrophic carbon demand Dark ocean info:eu-repo/semantics/article Article 2010 ftunivlaspalmas https://doi.org/10.1029/2010GL043105 2022-08-09T23:17:28Z It is generally assumed that sinking particulate organic carbon (POC) constitutes the main source of organic carbon supply to the deep ocean's food webs. However, a major discrepancy between the rates of sinking POC supply (collected with sediment traps) and the prokaryotic organic carbon demand (the total amount of carbon required to sustain the heterotrophic metabolism of the prokaryotes; i.e., production plus respiration, PCD) of deep-water communities has been consistently reported for the dark realm of the global ocean. While the amount of sinking POC flux declines exponentially with depth, the concentration of suspended, buoyant non-sinking POC (nsPOC; obtained with oceanographic bottles) exhibits only small variations with depth in the (sub)tropical Northeast Atlantic. Based on available data for the North Atlantic we show here that the sinking POC flux would contribute only 4–12% of the PCD in the mesopelagic realm (depending on the primary production rate in surface waters). The amount of nsPOC potentially available to heterotrophic prokaryotes in the mesopelagic realm can be partly replenished by dark dissolved inorganic carbon fixation contributing between 12% to 72% to the PCD daily. Taken together, there is evidence that the mesopelagic microheterotrophic biota is more dependent on the nsPOC pool than on the sinking POC supply. Hence, the enigmatic major mismatch between the organic carbon demand of the deep-water heterotrophic microbiota and the POC supply rates might be substantially smaller by including the potentially available nsPOC and its autochthonous production in oceanic carbon cycling models. 6 3,505 Q1 SCIE Article in Journal/Newspaper North Atlantic Northeast Atlantic Universidad de Las Palmas de Gran Canaria: Acceda Geophysical Research Letters 37 9 n/a n/a |
institution |
Open Polar |
collection |
Universidad de Las Palmas de Gran Canaria: Acceda |
op_collection_id |
ftunivlaspalmas |
language |
English |
topic |
251001 Oceanografía biológica Dark CO2 fixation Heterotrophic carbon demand Dark ocean |
spellingShingle |
251001 Oceanografía biológica Dark CO2 fixation Heterotrophic carbon demand Dark ocean Baltar González, Federico Aristegui, Javier Sintes, Eva Gasol, Josep M. Reinthaler, Thomas Herndl, Gerhard J. Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic |
topic_facet |
251001 Oceanografía biológica Dark CO2 fixation Heterotrophic carbon demand Dark ocean |
description |
It is generally assumed that sinking particulate organic carbon (POC) constitutes the main source of organic carbon supply to the deep ocean's food webs. However, a major discrepancy between the rates of sinking POC supply (collected with sediment traps) and the prokaryotic organic carbon demand (the total amount of carbon required to sustain the heterotrophic metabolism of the prokaryotes; i.e., production plus respiration, PCD) of deep-water communities has been consistently reported for the dark realm of the global ocean. While the amount of sinking POC flux declines exponentially with depth, the concentration of suspended, buoyant non-sinking POC (nsPOC; obtained with oceanographic bottles) exhibits only small variations with depth in the (sub)tropical Northeast Atlantic. Based on available data for the North Atlantic we show here that the sinking POC flux would contribute only 4–12% of the PCD in the mesopelagic realm (depending on the primary production rate in surface waters). The amount of nsPOC potentially available to heterotrophic prokaryotes in the mesopelagic realm can be partly replenished by dark dissolved inorganic carbon fixation contributing between 12% to 72% to the PCD daily. Taken together, there is evidence that the mesopelagic microheterotrophic biota is more dependent on the nsPOC pool than on the sinking POC supply. Hence, the enigmatic major mismatch between the organic carbon demand of the deep-water heterotrophic microbiota and the POC supply rates might be substantially smaller by including the potentially available nsPOC and its autochthonous production in oceanic carbon cycling models. 6 3,505 Q1 SCIE |
author2 |
Herndl, Gerhard Baltar, Federico Gasol, Josep M Sintes, Eva Aristegui, Javier Reinthaler, Thomas 23476314200 7006816204 15833225000 7003299234 8368531200 7005513845 1232580 227201 935469 97985 1454644 99734 BU-BAS |
format |
Article in Journal/Newspaper |
author |
Baltar González, Federico Aristegui, Javier Sintes, Eva Gasol, Josep M. Reinthaler, Thomas Herndl, Gerhard J. |
author_facet |
Baltar González, Federico Aristegui, Javier Sintes, Eva Gasol, Josep M. Reinthaler, Thomas Herndl, Gerhard J. |
author_sort |
Baltar González, Federico |
title |
Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic |
title_short |
Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic |
title_full |
Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic |
title_fullStr |
Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic |
title_full_unstemmed |
Significance of non-sinking particulate organic carbon and dark CO2 fixation to heterotrophic carbon demand in the mesopelagic northeast Atlantic |
title_sort |
significance of non-sinking particulate organic carbon and dark co2 fixation to heterotrophic carbon demand in the mesopelagic northeast atlantic |
publishDate |
2010 |
url |
http://hdl.handle.net/10553/53076 https://doi.org/10.1029/2010GL043105 |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_source |
Geophysical Research Letters [ISSN 0094-8276], v. 37 (9), L09602, (Mayo 2010) |
op_relation |
Geophysical Research Letters 37 0094-8276 http://hdl.handle.net/10553/53076 doi:10.1029/2010GL043105 2-s2.0-77952161445 77952161445 000277477800001 627452 L09602 B-1513-2013 C-3260-2012 B-1709-2008 H-8494-2015 D-5833-2013 E-6563-2013 Sí |
op_rights |
by-nc-nd info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2010GL043105 |
container_title |
Geophysical Research Letters |
container_volume |
37 |
container_issue |
9 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766134729979985920 |