Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 7, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL097900
Keywords
Deep Argo; deep ocean; vertical velocity
Categories
Funding
- NOAA Global Ocean Monitoring and Observation Program
- NOAA Research
- Paul G. Allen Family Foundation
- NSF [OCE-1923558]
- SIO CIMEAS Argo
- CORC (NOAA) [NA20OAR4320278]
- NOPP (NOAA) [NA18OAR0110434]
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Vertical velocity variances and dominant vertical wavelengths show regional variations, with larger root < w '(2)> and shorter lambda(z) in regions of rougher bathymetry or stronger deep currents.
Serendipitous measurements of deep internal wave signatures are evident in oscillatory variations around the background descent rates reported by one model of Deep Argo float. For the 10,045 profiles analyzed here, the average root-mean-square of vertical velocity variances,root < w '(2)>, from 1,000 m to the seafloor, is 0.0045 m s(-1), with a 5%-95% range of 0.0028-0.0067 m s(-1). Dominant vertical wavelengths, lambda(z), estimated from the integrals of lagged autocorrelation sequences have an average value of 757 m, with a 5%-95% range of 493-1,108 m. Both root < w '(2)> and lambda(z) exhibit regional variations among and within some deep ocean basins, with generally larger root < w '(2)> and shorter lambda(z) in regions of rougher bathymetry or stronger deep currents. These correlations are both expected, since larger root < w '(2)> and shorter lambda(z) should be found near internal wave generation regions.
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