Mesoscale Variability Linked to Interannual Displacement of Gulf Stream

Guo, Yiming; Bishop, Stuart P.; Bryan, Frank O.; Bachman, Scott

doi:10.1029/2022gl102549

Cited by 5 publications

(2 citation statements)

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“…Mesoscale activity can be estimated by the strength of EKE variability (Guo et al., 2023; Guo, Bachman, et al., 2022), which is strong in the mid‐latitudes and tropics (Figure 7b). For the two zonal bands characterized by a hybrid regime, EKE displays significant seasonality, with elevated eddy activity during the autumn/winter owing to increased wind energy input and stronger baroclinic instability (Uchida et al., 2017).…”

Section: Resultsmentioning

confidence: 99%

Global Ocean pCO₂ Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

Guo,

Timmermans

2024

JGR Oceans

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The variability in ocean surface partial pressure of carbon dioxide (pCO2), driven by both physical and biological processes, substantially influences air‐sea carbon exchange. It is widely recognized that the pCO2 variation at a specific ocean location is primarily dominated by either thermal or nonthermal effects. However, the distinct pCO2 variation regimes, their global distribution, and the mechanisms underlying such patterns have yet to be fully determined due to a paucity of global observations. Through the use of observation‐based products and an eddy‐resolving ocean simulation, this study demonstrates the presence of three distinct regimes in the global ocean: one in which sea surface temperature (SST) is the dominant control on pCO2 variations; another in which dissolved inorganic carbon (DIC) is the primary control; and a third previously uncharacterized hybrid regime where pCO2 variations are governed by seasonally‐varying factors. This hybrid regime is generally located between SST‐ and DIC‐dominated regimes and occupies approximately 15% of the global ocean. The regimes broadly exist in zonal bands that are closely linked to the relative strengths of SST and DIC variances. Seasonally‐varying mixed‐layer depth, mesoscale variability (quantified in terms of eddy kinetic energy), and biological processes modulate local pCO2 variations and play significant roles in shaping the global pattern of regime distributions. Understanding the distribution of pCO2 regimes, including the hybrid regime revealed in this study, as well as their different oceanic drivers, is essential for future predictions of ocean carbon uptake in response to global warming.

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Section: Resultsmentioning

confidence: 99%

Global Ocean pCO₂ Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

Guo,

Timmermans

2024

JGR Oceans

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“…As the most energetic features in the ocean, mesoscale phenomena with horizontal spatial scales on the order of 10–100 km, including coherent vortices (eddies), and strong lateral density gradients in the form of fronts and meanders, are ubiquitous in the global ocean (Chelton et al., 2011) and can significantly influence oceanic and atmospheric conditions (e.g., Frenger et al., 2013; Guo et al., 2023). Their pivotal role in redistributing ocean tracers such as mass (Zhang et al., 2014), salt (Melnichenko et al., 2021), and heat (Guo & Bishop, 2022) has been well‐established.…”

Section: Introductionmentioning

confidence: 99%

The Role of Ocean Mesoscale Variability in Air‐Sea CO₂ Exchange: A Global Perspective

Guo,

Timmermans

2024

Geophysical Research Letters

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Ocean mesoscale flows significantly influence nutrient distribution and biological productivity, yet the scarcity of eddy‐permitting observational data sets and climate modeling hinders understanding their role in carbon sequestration. Using an eddy‐resolving global simulation, this study investigates the significance of ocean mesoscales in air‐sea carbon dioxide (CO2) exchange. Results show over 30% of CO2 flux variance in energetic regions attributed to flows with horizontal scales smaller than 2°. Mesoscale flows can drive a cumulative CO2 flux that is either a net carbon sink or source depending on region, with magnitudes on the order of 105 tonnes of carbon per year. Variations in this mesoscale‐related CO2 flux are correlated with local relative vorticity and the background gradient of ocean partial pressure of CO2. This analysis underscores the importance of considering ocean mesoscales in monitoring carbon flux, highlighting the need to explore the influence of increasing eddy activity on carbon uptake in a changing climate.

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Mesoscale eddy variability over the Bay of Bengal in response to the contrasting phases of extreme Indian Ocean Dipole events

Boopathi,

Mohanty

2024

Regional Studies in Marine Science

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Mesoscale Variability Linked to Interannual Displacement of Gulf Stream

Cited by 5 publications

References 62 publications

Global Ocean pCO₂ Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

Global Ocean pCO₂ Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

The Role of Ocean Mesoscale Variability in Air‐Sea CO₂ Exchange: A Global Perspective

Mesoscale eddy variability over the Bay of Bengal in response to the contrasting phases of extreme Indian Ocean Dipole events

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Mesoscale Variability Linked to Interannual Displacement of Gulf Stream

Cited by 5 publications

References 62 publications

Global Ocean pCO2 Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

Global Ocean pCO2 Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

The Role of Ocean Mesoscale Variability in Air‐Sea CO2 Exchange: A Global Perspective

Mesoscale eddy variability over the Bay of Bengal in response to the contrasting phases of extreme Indian Ocean Dipole events

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Product

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Global Ocean pCO₂ Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

Global Ocean pCO₂ Variation Regimes: Spatial Patterns and the Emergence of a Hybrid Regime

The Role of Ocean Mesoscale Variability in Air‐Sea CO₂ Exchange: A Global Perspective