Eddy Tracking From In Situ and Satellite Observations

Erickson, Z. K.; Fields, E.; Johnson, L.; Thompson, A. F.; Dove, L. A.; D’Asaro, E.; Siegel, D. A.

doi:10.1029/2023JC019701

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Eddy Tracking From In Situ and Satellite Observations

2023
By Erickson, Z. K. ; Fields, E. ; Johnson, L. ; ...
Source: Journal of Geophysical Research: Oceans, 128, e2023JC019701
Series: PMEL Contribution no. 5444

[PDF-1.99 MB]

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Details:

Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Erickson, Z. K. ; Fields, E. ; Johnson, L. ; Thompson, A. F. ; Dove, L. A. ; ... More +

Erickson, Z. K. ; Fields, E. ; Johnson, L. ; Thompson, A. F. ; Dove, L. A. ; D’Asaro, E. ; Siegel, D. A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) Less -
Description:

Mesoscale eddies are a dominant source of spatial variability in the surface ocean and play a major role in the biological marine carbon cycle. Satellite altimetry is often used to locate and track eddies, but this approach is rarely validated against in situ observations. Here we compare measurements of a small (under 25 km radius) mode water anticyclonic eddy over the Porcupine Abyssal Plain in the northeastern Atlantic Ocean using CTD and Acoustic Doppler Current Profiler (ADCP) measurements from three ships, two gliders, two profiling floats, and one Lagrangian float with those derived from sea level anomaly (SLA). In situ estimates of the eddy center were estimated from maps of the thickness of its central isopycnal layer, from ADCP velocities at a reference depth, and from the trajectory of the Lagrangian float. These were compared to three methods using altimetric SLA: one based on maximizing geostrophic rotation, one based on a constant SLA contour, and one which maximizes geostrophic velocity speed along the eddy boundary. All algorithms were used to select CTD profiles that were within the eddy. The in-situ metrics agreed to 97%. The altimetry metrics showed only a small loss of accuracy, giving >90% agreement with the in situ results. This suggests that current satellite altimetry is adequate for understanding the spatial representation of even relatively small mesoscale eddies.
Keywords:

[+]

Eddies Acoustic Doppler Current Profiler (ADCP) CTD (Conductivity, Temperature And Depth) In-situ Observations Porcupine Abyssal Plain Satellite Altimetry Satellite Observations Sea Level Anomaly (SLA)
Source:

Journal of Geophysical Research: Oceans, 128, e2023JC019701
Series:

PMEL Contribution no. 5444
DOI:

https://doi.org/10.1029/2023JC019701
Format:

PDF
Document Type:

Journal Article
Place as Subject:

Atlantic Ocean
License:

https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:

CC BY-NC
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:40932042839e8881df179bcc3f9e75973a58c288df6d528d99caab9048b9ba21
Download URL:

https://repository.library.noaa.gov/view/noaa/56420/noaa_56420_DS1.pdf
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Eddy Tracking From In Situ and Satellite Observations

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