Riverine impact on future projections of marine primary production and carbon uptake
Riverine transport of nutrients and carbon from inland waters to the coastal and finally the open ocean alters marine primary production (PP) and carbon (C) uptake regionally and globally. So far, this process has not been fully represented and evaluated in the state-of-the-art Earth system models....
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ftdoajarticles:oai:doaj.org/article:df9d653b276b42b384aa928a63874560 2023-05-15T17:36:44+02:00 Riverine impact on future projections of marine primary production and carbon uptake S. Gao J. Schwinger J. Tjiputra I. Bethke J. Hartmann E. Mayorga C. Heinze 2023-01-01T00:00:00Z https://doi.org/10.5194/bg-20-93-2023 https://doaj.org/article/df9d653b276b42b384aa928a63874560 EN eng Copernicus Publications https://bg.copernicus.org/articles/20/93/2023/bg-20-93-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-93-2023 1726-4170 1726-4189 https://doaj.org/article/df9d653b276b42b384aa928a63874560 Biogeosciences, Vol 20, Pp 93-119 (2023) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.5194/bg-20-93-2023 2023-01-15T01:28:45Z Riverine transport of nutrients and carbon from inland waters to the coastal and finally the open ocean alters marine primary production (PP) and carbon (C) uptake regionally and globally. So far, this process has not been fully represented and evaluated in the state-of-the-art Earth system models. Here we assess changes in marine PP and C uptake projected under the Representative Concentration Pathway 4.5 climate scenario using the Norwegian Earth system model, with four riverine transport configurations for nutrients (nitrogen, phosphorus, silicon, and iron), carbon, and total alkalinity: deactivated, fixed at a recent-past level, coupled to simulated freshwater runoff, and following four plausible future scenarios. The inclusion of riverine nutrients and carbon at the 1970 level improves the simulated contemporary spatial distribution of annual mean PP and air–sea CO 2 fluxes relative to observations, especially on the continental margins (5.4 % reduction in root mean square error (RMSE) for PP) and in the North Atlantic region (7.4 % reduction in RMSE for C uptake). While the riverine nutrients and C input is kept constant, its impact on projected PP and C uptake is expressed differently in the future period from the historical period. Riverine nutrient inputs lessen nutrient limitation under future warmer conditions as stratification increases and thus lessen the projected decline in PP by up to 0.66 ± 0.02 Pg C yr −1 (29.5 %) globally, when comparing the 1950–1999 with the 2050–2099 period. The riverine impact on projected C uptake depends on the balance between the net effect of riverine-nutrient-induced C uptake and riverine-C-induced CO 2 outgassing. In the two idealized riverine configurations the riverine inputs result in a weak net C sink of 0.03–0.04 ± 0.01 Pg C yr −1 , while in the more plausible riverine configurations the riverine inputs cause a net C source of 0.11 ± 0.03 Pg C yr −1 . It implies that the effect of increased riverine C may be larger than the effect of nutrient inputs in the ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Biogeosciences 20 1 93 119 |
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English |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 S. Gao J. Schwinger J. Tjiputra I. Bethke J. Hartmann E. Mayorga C. Heinze Riverine impact on future projections of marine primary production and carbon uptake |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Riverine transport of nutrients and carbon from inland waters to the coastal and finally the open ocean alters marine primary production (PP) and carbon (C) uptake regionally and globally. So far, this process has not been fully represented and evaluated in the state-of-the-art Earth system models. Here we assess changes in marine PP and C uptake projected under the Representative Concentration Pathway 4.5 climate scenario using the Norwegian Earth system model, with four riverine transport configurations for nutrients (nitrogen, phosphorus, silicon, and iron), carbon, and total alkalinity: deactivated, fixed at a recent-past level, coupled to simulated freshwater runoff, and following four plausible future scenarios. The inclusion of riverine nutrients and carbon at the 1970 level improves the simulated contemporary spatial distribution of annual mean PP and air–sea CO 2 fluxes relative to observations, especially on the continental margins (5.4 % reduction in root mean square error (RMSE) for PP) and in the North Atlantic region (7.4 % reduction in RMSE for C uptake). While the riverine nutrients and C input is kept constant, its impact on projected PP and C uptake is expressed differently in the future period from the historical period. Riverine nutrient inputs lessen nutrient limitation under future warmer conditions as stratification increases and thus lessen the projected decline in PP by up to 0.66 ± 0.02 Pg C yr −1 (29.5 %) globally, when comparing the 1950–1999 with the 2050–2099 period. The riverine impact on projected C uptake depends on the balance between the net effect of riverine-nutrient-induced C uptake and riverine-C-induced CO 2 outgassing. In the two idealized riverine configurations the riverine inputs result in a weak net C sink of 0.03–0.04 ± 0.01 Pg C yr −1 , while in the more plausible riverine configurations the riverine inputs cause a net C source of 0.11 ± 0.03 Pg C yr −1 . It implies that the effect of increased riverine C may be larger than the effect of nutrient inputs in the ... |
format |
Article in Journal/Newspaper |
author |
S. Gao J. Schwinger J. Tjiputra I. Bethke J. Hartmann E. Mayorga C. Heinze |
author_facet |
S. Gao J. Schwinger J. Tjiputra I. Bethke J. Hartmann E. Mayorga C. Heinze |
author_sort |
S. Gao |
title |
Riverine impact on future projections of marine primary production and carbon uptake |
title_short |
Riverine impact on future projections of marine primary production and carbon uptake |
title_full |
Riverine impact on future projections of marine primary production and carbon uptake |
title_fullStr |
Riverine impact on future projections of marine primary production and carbon uptake |
title_full_unstemmed |
Riverine impact on future projections of marine primary production and carbon uptake |
title_sort |
riverine impact on future projections of marine primary production and carbon uptake |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/bg-20-93-2023 https://doaj.org/article/df9d653b276b42b384aa928a63874560 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 20, Pp 93-119 (2023) |
op_relation |
https://bg.copernicus.org/articles/20/93/2023/bg-20-93-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-93-2023 1726-4170 1726-4189 https://doaj.org/article/df9d653b276b42b384aa928a63874560 |
op_doi |
https://doi.org/10.5194/bg-20-93-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
1 |
container_start_page |
93 |
op_container_end_page |
119 |
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1766136316527902720 |