Constraint on net primary productivity of the global ocean by Argo oxygen measurements

Johnson, Kenneth S.; Bif, Mariana B.

doi:10.1038/s41561-021-00807-z

Cited by 41 publications

(55 citation statements)

References 55 publications

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“…The phase-locking of the diel cycle with irradiance has been used to estimate GPP and loss from dissolved oxygen and other biological variables 15,16,17,3 . Here we adapt these diel models to estimate the GPP of ChlF (GPP ChlF ) and the rate of ChlF loss from the on-isopycnal variability of ChlF and colocated PAR.…”

Section: Gross Primary Productivity From Diel Cyclesmentioning

confidence: 99%

“…The ocean contributes roughly 50% of the total global autotrophic carbon fixation, with over 40% of ocean primary productivity occurring in the vast but relatively low biomass oligotrophic seas 1 . Although our current understanding is that net primary productivity in the subtropical oligotrophic ocean is limited by nutrient supply and not light availability 2 , we have only recently gained the capacity to make autonomous, long-duration measurements of the process below the ocean's surface 3 . Less is known about how subtropical primary productivity varies on small time-and space-scales, or its response to the rapidly changing subtropical weather patterns.…”

Section: Introductionmentioning

confidence: 99%

“…Autonomous technology to measure biogeochemical (BGC) variability in the ocean -such as the BGC-Argo float program 10 -has provided a new opportunities to quantify the variability of the ocean carbon system 2,3 . These platforms provide information about biogeochemical transformations below the ocean's surface that is largely invisible to satellite remote sensing 11 .…”

Section: Introductionmentioning

confidence: 99%

“…These platforms provide information about biogeochemical transformations below the ocean's surface that is largely invisible to satellite remote sensing 11 . Although only recently deployed at scale, autonomous BGC measurements have demonstrated that our capacity to make future predictions of the state of the climate depends sensitively on constraining BGC ocean processes 12,3 .…”

Section: Introductionmentioning

confidence: 99%

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Monsoons, plumes, and blooms: intraseasonal variability of subsurface primary productivity in the Bay of Bengal

Schlosser

Lucas

Omand

et al. 2022

Preprint

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During the southwest monsoon, seasonal storms bring torrential rainfall to the South Asian subcontinent and the northern Indian Ocean. Dense cloud cover limits the amount of sunlight that reaches the ocean surface, and sediment-laden river runoff limits the depths to which light can penetrate. Changing light availability should affect phytoplankton primary productivity and its dependent biogeochemical processes. Yet little is known about how subtropical weather is linked to ecosystem processes below the ocean’s surface. Here, using novel physical and bio-optical measurements from an array of free-drifting, autonomous systems, we show that the onset of cloudy, rainy conditions associated with stormy periods led to >50% reduction in subsurface gross primary productivity (GPP) relative to clear, sunny break periods. Simultaneous bioacoustic measurements collected onboard the autonomous platforms suggested that this intraseasonal variability in GPP generated a response in higher trophic levels. Long-term measurements from biogeochemical (BGC) Argo floats indicated that the magnitude of the days-to-weeks variability reported here was similar to that of the regional annual cycle in the region. Our findings demonstrate that intraseasonal subtropical air-sea variability modulates important regional biogeochemical ocean processes in the Northern Indian Ocean, and may help improve our ability to forecast the changing global climate system.

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Section: Gross Primary Productivity From Diel Cyclesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monsoons, plumes, and blooms: intraseasonal variability of subsurface primary productivity in the Bay of Bengal

Schlosser

Lucas

Omand

et al. 2022

Preprint

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show abstract

“…Gas exchange is a key part of the biogeochemical cycle of many climatically important gases, such as CO 2 , N 2 O, and DMS, as well as of O 2 which is increasingly being used to quantify rates of biological production and CO 2 uptake through the biological pump (e.g., Alkire et al., 2014; Emerson, 2014; Hamme et al., 2012; Johnson & Bif, 2021; Juranek et al., 2012; Nicholson et al., 2015; Palevsky et al., 2016; Plant et al., 2016; Stanley et al., 2015). Much progress has been made in developing air‐sea gas exchange parameterizations that give accurate estimates of fluxes for multiple gases in a variety of wind conditions (D'Asaro & McNeil, 2007; Ho et al., 2011; McNeil & D'Asaro, 2007; Sweeney et al., 2007; Vagle et al., 2010; Wanninkhof et al., 2009; Wrobel & Piskozub, 2016).…”

Section: Introductionmentioning

confidence: 99%

Gas Fluxes and Steady State Saturation Anomalies at Very High Wind Speeds

et al. 2022

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Significant dark inorganic carbon fixation in the euphotic zone of an oligotrophic sea

Reich,

Belkin,

Sisma‐Ventura

et al. 2024

Limnology & Oceanography

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Estimates of primary productivity have traditionally disregarded dark inorganic carbon fixation by marine microorganisms. Currently, only limited data are available from different systems on this potentially ecologically important process. We present monthly dark inorganic carbon fixation and photosynthetic rates from the euphotic layer of the northern Gulf of Aqaba collected over a decade between 2010 and 2020. Averaged dark inorganic carbon fixation rates from surface to 100 m depth, ranged from 99 to 173 mg C m−2 d−1, which corresponds to ~ 43% of the annual primary productivity at this location. The lowest dark inorganic carbon fixation rates were found during winter, contributing ~ 7.5% of the integrated primary productivity. During the oligotrophic summer, dark inorganic carbon fixation comprised a larger fraction of the integrated primary productivity estimated as ~ 12%. In accordance, dark inorganic carbon fixation contributed ~ 6% to the particulate organic carbon flux during the winter and ~ 30% during summertime. Complimentary nutrient‐enrichment bioassays of seawater from 5 m show that dissolved organic nutrient enrichment (P and C based) significantly elevates dark inorganic carbon fixation, whereas addition of dissolved inorganic nutrients (, , or both) significantly increased photosynthesis but to a lesser extent dark inorganic carbon fixation. These results suggest that dark inorganic carbon fixation may be an important biochemical process throughout the euphotic zone of oligotrophic seas, and thus should be incorporated into oceanic carbon production estimates.

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Constraint on net primary productivity of the global ocean by Argo oxygen measurements

Cited by 41 publications

References 55 publications

Monsoons, plumes, and blooms: intraseasonal variability of subsurface primary productivity in the Bay of Bengal

Monsoons, plumes, and blooms: intraseasonal variability of subsurface primary productivity in the Bay of Bengal

Gas Fluxes and Steady State Saturation Anomalies at Very High Wind Speeds

Significant dark inorganic carbon fixation in the euphotic zone of an oligotrophic sea

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