Dissipation of mesoscale eddies at a western boundary via a direct energy cascade.
Dissipation of mesoscale eddies at a western boundary via a direct energy cascade.
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通过直接能量级联的西部边界中尺度涡旋耗散。
DOI:
10.1038/s41598-022-05002-7
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发表时间:
2022-01-18
影响因子:
4.6
通讯作者:
Naveira Garabato AC
中科院分区:
文献类型:
--
作者:
Evans DG;Frajka-Williams E;Naveira Garabato AC
The fate of mesoscale eddy kinetic energy represents a large source of uncertainty in the global ocean energy budget. Satellite altimetry suggests that mesoscale eddies vanish at ocean western boundaries. However, the fate of the eddies’ kinetic energy remains poorly known. Here we show that the generation of small-scale turbulence as eddy flow impinges on the steep and corrugated slope of an ocean western boundary plays a dominant role in the regional decay of mesoscale eddy kinetic energy. We compare altimetry-based estimates of mesoscale eddy kinetic energy decline with measurements of turbulent dissipation. Mesoscale eddies are found to decay at a rate of 0.016 ± 0.012 GW and 0.023 ± 0.017 GW for anticyclonic and cyclonic eddies, respectively, similar to the observed turbulent dissipation rate of 0.020 ± 0.011 GW. This demonstrates that a major direct transfer of mesoscale eddy kinetic energy to small, dissipative scales can be effectively triggered by the eddies’ interaction with the western boundary topography.
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影响因子:
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