Primary production, an index of climate change in the ocean: Satellite-based estimates over two decades

• Autores: Kulk, Gemma; Platt, Trevor; Dingle, James; Jackson, Thomas; Jönsson, Bror F.; Bouman, Heather A.; Babin, Marcel; Brewin, Robert J. W.; Doblin, Martina; Estrada, Marta; Figueiras, Francisco G.; Furuya, Ken; González-Benítez, Natalia; Gudfinnsson, Hafsteinn G.; Gudmundsson, Kristinn; Huang, Bangqin; Isada, Tomonori; Kovač, Žarko; Lutz, Vivian Alicia; Marañón, Emilio; Raman, Mini; Richardson, Katherine; Rozema, Patrick D.; van de Poll, Willem H.; Segura, Valeria; Tilstone, Gavin H.; Uitz, Julia; van Dongen-Vogels, Virginie; Yoshikawa, Takashi; Sathyendranath, Shubha
• Año de publicación: 2020
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: CLIMATE CHANGE; OCEAN-COLOUR REMOTE-SENSING; PHOTOSYNTHESIS; PHYTOPLANKTON; PRIMARY PRODUCTION
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Primary production by marine phytoplankton is one of the largest fluxes of carbon on our planet. In the past few decades, considerable progress has been made in estimating global primary production at high spatial and temporal scales by combining in situ measurements of primary production with remote-sensing observations of phytoplankton biomass. One of the major challenges in this approach lies in the assignment of the appropriate model parameters that define the photosynthetic response of phytoplankton to the light field. In the present study, a global database of in situ measurements of photosynthesis versus irradiance (P-I) parameters and a 20-year record of climate quality satellite observations were used to assess global primary production and its variability with seasons and locations as well as between years. In addition, the sensitivity of the computed primary production to potential changes in the photosynthetic response of phytoplankton cells under changing environmental conditions was investigated. Global annual primary production varied from 38.8 to 42.1 Gt C yr-1 over the period of 1998-2018. Inter-annual changes in global primary production did not follow a linear trend, and regional differences in the magnitude and direction of change in primary production were observed. Trends in primary production followed directly from changes in chlorophyll-a and were related to changes in the physico-chemical conditions of the water column due to inter-annual and multidecadal climate oscillations. Moreover, the sensitivity analysis in which P-I parameters were adjusted by ±1 standard deviation showed the importance of accurately assigning photosynthetic parameters in global and regional calculations of primary production. The assimilation number of the P-I curve showed strong relationships with environmental variables such as temperature and had a practically one-to-one relationship with the magnitude of change in primary production. In the future, such empirical relationships could potentially be used for a more dynamic assignment of photosynthetic rates in the estimation of global primary production. Relationships between the initial slope of the P-I curve and environmental variables were more elusive.
Fil: Kulk, Gemma. Plymouth Marine Laboratory; Reino Unido
Fil: Platt, Trevor. Plymouth Marine Laboratory; Reino Unido
Fil: Dingle, James. Plymouth Marine Laboratory; Reino Unido
Fil: Jackson, Thomas. Plymouth Marine Laboratory; Reino Unido
Fil: Jönsson, Bror F.. Plymouth Marine Laboratory; Reino Unido
Fil: Bouman, Heather A.. University of Oxford; Reino Unido
Fil: Babin, Marcel. Observatoire Océanologique de Villefranche Sur Mer; Francia
Fil: Brewin, Robert J. W.. University of Exeter; Reino Unido
Fil: Doblin, Martina. University of Technology Sydney; Australia
Fil: Estrada, Marta. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España
Fil: Figueiras, Francisco G.. Consejo Superior de Investigaciones Cientificas. Instituto de Investigaciones Marinas.; España
Fil: Furuya, Ken. University of Tokyo; Japón
Fil: González-Benítez, Natalia. Universidad Rey Juan Carlos; España
Fil: Gudfinnsson, Hafsteinn G.. Marine And Freshwater Research Institute; Islandia
Fil: Gudmundsson, Kristinn. Marine And Freshwater Research Institute; Islandia
Fil: Huang, Bangqin. Xiamen University; China
Fil: Isada, Tomonori. Hokkaido University; Japón
Fil: Kovač, Žarko. University of Split; Croacia
Fil: Lutz, Vivian Alicia. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
Fil: Marañón, Emilio. Universidad de Vigo; España
Fil: Raman, Mini. Indian Space Research Organization; India
Fil: Richardson, Katherine. Universidad de Copenhagen; Dinamarca
Fil: Rozema, Patrick D.. University of Groningen; Dinamarca
Fil: van de Poll, Willem H.. University of Groningen; Dinamarca
Fil: Segura, Valeria. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina
Fil: Tilstone, Gavin H.. Plymouth Marine Laboratory; Reino Unido
Fil: Uitz, Julia. Observatoire Océanologique de Villefranche Sur Mer; Francia
Fil: van Dongen-Vogels, Virginie. Australian Institute Of Marine Science; Australia
Fil: Yoshikawa, Takashi. The University Of Tokyo; Japón
Fil: Sathyendranath, Shubha. Plymouth Marine Laboratory; Reino Unido