
Citation: | TANG Limei, DONG Yanhui, CHU Fengyou, CHEN Ling, MA Weilin, LIU Yonggang. Geochemistry and age of seamounts in the West Pacific: mantle processes and petrogenetic implications[J]. Acta Oceanologica Sinica, 2019, 38(1): 71-77. doi: 10.1007/s13131-019-1371-0 |
Submesoscale motions, such as submesoscale front (the density step) and filament (the density line) currents and submesocale eddies, are the key processes in the ocean (Capet et al., 2008a, b, c; McWilliams, 2016; Zhang et al., 2021; Taylor and Thompson, 2023). The scales of submesoscale currents are O (0.1–10 km) in the horizontal direction and O (0.01–1 km) in the vertical direction (McWilliams, 2016, 2021). The boundary layer turbulence (thermal convection turbulence induced by the sea surface cooling, Langmuir turbulence induced by the wave-current interactions and shear turbulence induced by the wind forcing) is also an important process in the upper mixed layer (Skyllingstad and Denbo, 1995; McWilliams et al., 1997; Sullivan et al., 2007; Sullivan and McWilliams, 2018, 2019). The frontogenesis of the fronts and filaments may be induced by both of the mesoscale strain (Hoskin, 1982; McWilliams and Fox-Kemper, 2013) and the turbulent vertical mixing (Gula et al., 2014; McWilliams et al., 2009, 2015). The frontogenesis of the fronts and filaments created by the turbulent vertical mixing is called the turbulent thermal wind (TTW) (Gula et al., 2014; McWilliams, 2017). The TTW is a balance among the baroclinic pressure gradient, Coriolis force and turbulent vertical mixing (McWilliams et al., 2015). McWilliams et al. (2015) found that the cold filament frontogenesis induced by the turbulent vertical mixing is consistent with that caused by the mesoscale strain. The ageostrophic secondary circulations driven by the strain of the mesoscale motions or the turbulent vertical mixing are associated with the horizontal width and buoyancy gradient of the submesoscale fronts and filaments (Lapeyre et al., 2006; Boccaletti et al., 2007; Shakespeare and Tayor, 2013; Gula et al., 2014; Hamlington et al., 2014; McWilliams et al., 2015; Smith et al., 2016; Suzuki and Fox-Kemper, 2016; McWilliams, 2017, 2018; Pham and Sarkar, 2018; Sullivan and McWilliams, 2018, 2019; Barkan et al., 2019), that is, whether the ageostrophic secondary circulations are activated by the strain of the mesoscale motions or the turbulent vertical mixing depends on the intensity of the fronts and filament. The submesoscale motions impact the variation of the upper mixed layer and large-scale circulations (Lapeyre et al., 2006; Dauhajre et al., 2017; Hypolite et al., 2021; Zhang et al., 2023a), thus the studies of the submesoscale processes are used to parameterize the effect of the submesoscale motions on the large-scale processes in the general ocean circulation models (GOCMs) (Fox-Kemper et al., 2008; Bodner et al., 2023; Zhang et al., 2023b).
The theory of the TTW balance has been used to study the frontogenesis of the submesoscale fronts and filaments from Gula et al. (2014) and McWilliams et al. (2015). The frontogenesis of a dense filament induced by the turbulent vertical mixing is simulated by the regional ocean modeling system (ROMS) (McWilliams et al., 2015), the results shown that the spatial symmetry of the down- and cross-filament currents only created by the idealized vertical eddy viscosity can be distorted through the surface wind forcing. McWilliams (2017) diagnosed the flow fields of the fronts and filaments forced by the surface wind stress based on the TTW balance, the results indicated that the frontogenetical tendencies of the submesoscale currents associated with the TTW relation are similar to that caused the mesoscale strain-induced frontogenesis. Dauhajre et al. (2017) found that the secondary circulations subject to the strong diurnal variation of the surface heating and turbulent vertical mixing do not consist with the steady-state TTW balance. McWilliams (2018) explored the surface wave effects on the submesoscale fronts and filaments using a method of the diagnostic analysis, the results displayed that the influence of the short waves on the submesoscale frontogenesis is stronger relative to the swell waves. Crow and Taylor (2018, 2019) examined the effect of the small-scale turbulence on the evolution of the submesoscale front with the imposed viscosity and diffusivity, they found that the dominant balance is the quasi-steady TTW balance with time owing to an advection-diffusion balance in the buoyancy equation, the spreading rate is maximum for an intermediate value of the Ekman number (the depth-averaged dimensional viscosity). The above results show that the TTW balance is an important theory for studying the dynamic mechanism of the submesoscale frontogenesis in the upper mixed layer. Barkan et al. (2019) further verified the TTW balance based on an asymptotic mode of the submesoscale frontogenesis.
Large eddy simulation (LES) model is a valuable tool to explore the effect of the boundary layer turbulence on the variation in the submesoscale flow fields of the fronts and filaments, when the secondary circulations may be created by the turbulent vertical mixing (McWilliams et al., 2015; McWilliams, 2019; Yuan and Liang, 2021). For a cold filament, the thermal convection turbulence induced by the sea surface cooling causes the spatial symmetry of the secondary circulations, geostrophic currents and temperature gradients, whereas the shear turbulence caused by the wind force distorts the symmetry of submesoscale flow fields (Sullivan and McWilliams, 2018). Langmuir turbulence induced by the wave-current interactions (Leibovich, 1983) can further disrupt the symmetry of submesoscale flow fields of a cold filament (Sullivan and McWilliams, 2019). Sullivan and McWilliams (2018, 2019) also discovered that the frontogenetical evolution of a cold filament should include the onset, arrest and decay periods regardless of the force fields, while the frontogenesis intensity of a cold filament is influenced by the force fields that may create or disrupt the symmetry of the flow fields. Sullivan and McWilliams (2024) found that the magnitude of the initial horizontal buoyancy gradient and the sea surface flux plays an important role in the frontogenetical strength of the cold filament frontogenesis, but the cold filament frontolysis does not appear in their simulations.
The Coriolis effect may induce the periodic increase and decrease in the gradient of the cross-front flow for a front during the period
The remainder of this paper is organized as follows: Section 2 describes briefly the LES model and an idealized simulation case, and Section 3 presents the evolution in the direction and amplitude of the temperature field and the submesoscale currents with time. A summary of the findings is given in Section 4.
The dynamics of the upper mixed layer, including the thermal convection turbulence and the submesoscale currents, is assumed to be described by a conventional LES model (Skyllingstad and Denbo, 1995; McWilliams et al., 1997; Skyllingstad and Samelson, 2012; Sullivan and McWilliams, 2018). The LES equation set with the system rotation and stable stratification is given by
$$ \frac{\partial {u}_{i}}{\partial {x}_{i}}=0 , $$ | (1) |
$$ \frac{\partial {u}_{i}}{\partial t}+\frac{\partial {u}_{i}{u}_{j}}{\partial {x}_{j}}=-\frac{\partial P}{\partial {x}_{i}}-\frac{\partial {\tau }_{ij}}{\partial {x}_{j}}-{\xi }_{ijk}{{u}_{j}f}_{k}-{\text{δ}} _{i3}g\frac{\rho }{{\rho }_{0}} , $$ | (2) |
$$ \frac{\partial e}{\partial t}+{u}_{j}\frac{\partial e}{\partial {x}_{j}}={S}_{{\mathrm{sgs}}}+{B}_{{\mathrm{sgs}}}-\varepsilon +{D}_{{\mathrm{sgs}}} , $$ | (3) |
$$ \frac{\partial T}{\partial t}+\frac{\partial {u}_{j}T}{\partial {x}_{j}}+\frac{\partial {\tau }_{Tj}}{\partial {x}_{j}}=0 , $$ | (4) |
where
The two-dimension (2-D) (x-z plane) model of an idealized dense filament is set in the temperature field of the simulation domain. The buoyancy (b) is calculated based on the resolved temperature (T) by
We follow the cold filament structure of McWilliams (2017, 2018), the buoyancy field (
$$ \begin{split} b\left(x,z\right)=\; & {b}_{0}+{N}_{\rm{b}}^{2}\left(z+H\right)+{N}_{0}^{2}/2\{\left(1+\varGamma \right)z-\left(1-\varGamma \right)\{h(x)+\\ &{\lambda }^{-1}{\log_{10}}\{{\mathrm{cosh}}\left[\lambda \left(z+h(x)\right)\right]\}\}\},\end{split} $$ | (5) |
where
For a cold filament, the depth of the upper mixed layer is given by
$$ h\left(x\right)=h_0+\delta h_0\mathrm{e}\mathrm{x}\mathrm{p}\left[-\left(\frac{x}{W_{\mathrm{D}}}\right)^2\right], $$ | (6) |
where x = 0 is the center of the filament,
The constants employed in the above formulas are
$$ \left\{\begin{array}{l}H=250\;{\mathrm{m}},\\ {N}_{0}^{2}=3.4\times {10}^{-5}\;{\mathrm{s}}^{-2},\\ \varGamma =0.002\;5,\\ {b}_{0}=6.4\times {10}^{-3}\;{\mathrm{m/s}}^{2},\\ {N}_{\rm{b}}^{2}=1.0\times {10}^{-7}\;{{\mathrm{s}}}^{-2},\\ {W}_{\mathrm{D}}=1.5\;{\mathrm{km}},\\ {h}_{0}=60\;{\mathrm{m}},\\ \delta {h}_{0}=15\;{\mathrm{m}},\\ {\lambda }^{-1}=3\;{\mathrm{m}}.\end{array}\right. $$ | (7) |
The above definitions create an initial cold filament in the cross-filament (x-z) plane. The width of the cold filament is 2
We follow method of Sullivan and McWilliams (2018), a kinematic heat flux
The surface cooling imposes on the sea surface (z = 0 m). The stress-free conditions are used on the bottom boundary (z = –H) (Haney et al., 2015). The periodic boundary conditions are used in the horizontal (x-y) planes. The spatial discretization is the second-order finite differences in the vertical direction and the pseudospectral method in the horizontal directions (Sullivan and McWilliams, 2019). The time integral is advanced by the third-order Runge-Kutta scheme (RK3).
Firstly, the simulation is integrated for an inertial period t =
The submesoscale flow fields of the cold filament are projected onto the cross-filament (x-z) plane with the spatial average in the along-filament (y) direction, which may reduce the random errors and highlight the main structures of the submesoscale flow fields (Skyllingstad and Samelson, 2012; Hamlington et al., 2014; Suzuki and Fox-Kemper, 2016; Sullivan and McWilliams, 2018, 2019; Verma et al., 2019). Hereafter the spatial average flow fields in the down-filament (y) direction are indicated by the angle bracket
The peak value vertical velocity
The cross-filament profiles of the cross-filament velocity
The submesoscale flow patterns of the cold filament in the x-z plane can indicate the cold filament frontogenesis and frontolysis (Blumen, 2000; Sullivan and McWilliams, 2019). Figure 4 shows the submesoscale flow fields at t = 3.27 h corresponding to the time stamp of the first frontogenesis arrest (Fig. 2). The width of the cold filament above/below z = –22 m is narrower/wider relative to the initial state (Fig. 4a). The reason is that the secondary circulations
Figure 5 shows the submesoscale flow fields at t = 7.51 h corresponding to the time stamp of the first frontolysis arrest (Fig. 2). The width of cold filament above/below z = –22 m at t = 7.51 h (Fig. 5a) is wider/narrower relative to that at t = 3.27 h (Fig. 4a). This is owing to that the direction of the secondary circulations
The change in the direction of the secondary circulations (Figs 4b and d and Figs 5b and d) can induce the conversion between the frontogenesis and the frontolysis of the cold filament (Figs 4a and 5a). In addition, the direction of the down-filament velocity is unchanged with time, which is due to that, for a cold filament, the direction of the down-filament currents is dominated by the horizontal temperature (buoyancy) gradient. The results suggest that the direction of the cross-filament secondary circulations is only changed by the Coriolis force, while the direction of the down-filament velocity does not be changed by Coriolis force. Furthermore, Figs 5a and d show that the water from the thermocline may be transported into the upper mixed layer, which should play an important role in the biochemical process.
The evolution of the temperature and flow fields can directly display the frontogenesis processes of the cold filament caused by the thermal convection turbulence with time (McWilliams et al., 2015; Sullivan and McWilliams, 2018; Li et al., 2024). Figure 6 shows the variation of the submesoscale flow fields with time. The change in the direction of the secondary circulations
The intensity of the submesoscale currents with the surface horizontal convergence and the downwelling in the range of cold core is much stronger than that with the surface horizontal divergence and the upwelling (Figs 6b and d), which induces that cold filament frontogenesis is more intense relative to cold filament frontolysis (Fig. 6a). In addition to the periodic variation of the submesoscale currents, the total tendency of the intensity of the submesoscale currents becomes weak with time (Figs 6b, c and d), which is induced by the weakening temperature gradient (Fig. 6a) due to the turbulent mixing of the thermal convective turbulence and the submesoscale turbulence (McWilliams et al., 2005; Sullivan and McWilliams, 2018; Li et al., 2024). In addition, the width of the cold core gradually increases (Fig. 6a) with the reduction in the intensity of the secondary circulation (Figs 6b and d). This result implies that the final collapse of the cold filament may be through the turbulent mixing.
The evolution of the temperature field and secondary circulations in the vertical (z) direction with time is also the important information for parameterizing the influence of the cold filament frontogenesis on the large-scale motions in OGCMs, because which may further demonstrate the impact of the submesoscale frontogenesis and frontolysis on the variation of the upper mixed layer (Haney et al., 2015). The evolution of the secondary circulations
The tendency in the intensity of the secondary circulations becomes weak with time (Figs 7b, c and d), which causes the reduction in the variations of the upper mixed layer depth and the stratification within the upper mixed layer (Fig. 7a). This result indicates that the turbulent mixing of the thermal convective turbulence and the submesoscale turbulence (Sullivan and McWilliams, 2018, 2019) gradually reduces the intensity of the cold filament frontogenesis and frontolysis with time (Fig. 7). Hence, this result further shows that the parametrization of the cold filament lifecycle should include the change in the depth of the upper mixed layer and the stratification within the upper mixed layer owing to the conversion between the frontogenesis the and frontolysis.
The frontogenesis process of the submesoscale cold filament caused by the thermal convection turbulence is studied by a non-hydrostatic large eddy simulation model. The results indicate that the change in the direction of the cross-filament secondary circulations is caused the inertial oscillation associated with the Coriolis force, suggesting that the magnitude and direction of the secondary circulations may be directly modulated by the Coriolis effect. Hence, the change in the direction of the secondary circulations causes the conversion between the frontogenesis and the frontolysis of the cold filament within an inertial period. The frontogenesis and frontolysis of the cold filament further induce the increase and decrease in the depth of the upper mixed layer and the enhancement and reduction in the stratification within the upper mixed layer. In addition, the width of the cold core gradually increases with the weakening intensity of the secondary circulations, which suggests that the final collapsion of the cold filament may be caused by turbulent mixing.
For a cold filament, the frontolysis is the reverse process of the frontogenesis. The direction of the secondary circulations for the cold filament frontolysis is opposite to that for the cold filament frontogenesis. Hence, during the frontolysis process, the secondary circulations may transport the nutrient rich water of the thermocline into the upper mixed layer, which plays an important role in the primary productivity of the ocean.
The parameterization schemes of the submesoscale front/filament processes only include the frontogenesis process in the present stage (Zhang et al., 2023b; Bodner et al., 2020, 2023). The conversion between the frontogenesis and frontolysis may periodically break and restore the structure of cold filament in this simulation, therefore the parameterization schemes of submesoscale front/filament processes needs to include the frontolysis process in the future.
Acknowledgements: This research was also supported by the Postdoctoral Innovation Practice Base of Hezhou University and the Guangxi Yuchai New Energy Co. Ltd. The large eddy simulation model is provided by the National Center for Atmospheric Research.
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