Development of Onboard Processing Capabilities for a Slocum Glider Acoustic Doppler Current Profiler

Gradone, Joseph; Hunter, Elias; Mullison, J.; Miles, Travis

doi:10.23919/oceans44145.2021.9705895

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Fundamentally, they either decompose the different components measured by glidermounted current profilers or rely on assumptions to ignore them. The inversion method was originally developed for ship-based lowered current profilers (Visbeck, 2002) but has been adapted for use on gliders and used extensively (Todd et al, 2011;Ellis et al, 2015;Miles et al, 2015;Todd et al, 2017;Ma et al, 2019;Heiderich & Todd, 2020;Gradone et al, 2021). This method solves a system of equations for both unknown glider velocities and absolute horizontal water velocities using least squares techniques.…”

Section: 𝑈 = 𝑈 + 𝑈 + 𝑈mentioning

confidence: 99%

Upper Ocean Transport in the Anegada Passage from Multi-Year Glider Surveys

Gradone

Wilson

Glenn

et al. 2023

Preprint

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Caribbean through-flow accounts for up to two-thirds of the Florida Current and consequently is an important conduit of heat and salt fluxes in the Atlantic branch of the Meridional Overturning Circulation (MOC). While high-latitude sinking and interior mixing processes have a first order control on the magnitude of the MOC, low-latitude wind-driven processes determine and modify the subsurface density structure of the water masses flowing through the Caribbean Sea. Considering there is evidence that up to one-half of the Florida Current originates as South Atlantic Waters (SAW), determining the distribution of SAW throughout the Caribbean Island passages is important as this constitutes the major pathway for cross-equatorial MOC return flow. Ship-based observations in the 1990’s revealed the Windward Island passages as a dominant SAW inflow pathway. However, there is still a significant amount of SAW that is taking an unknown, alternate route northward. The Anegada Passage (AP) is a major location for subtropical gyre inflow and suggested to be an alternate SAW inflow pathway. Here, we present the first co-located observations of temperature, salinity, and subsurface velocity in the AP in nearly 20 years. These observations provide evidence that the total transport (4-5 Sv) and the transport of SAW through the AP (1-2.55 Sv) is larger than previously estimated. This result implies that the AP is a significant pathway for cross-equatorial MOC return flow. The results presented here also provide evidence that gliders with acoustic doppler profilers are viable, cost-effective method for measuring island passage transport.

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Section: 𝑈 = 𝑈 + 𝑈 + 𝑈mentioning

confidence: 99%

Upper Ocean Transport in the Anegada Passage from Multi-Year Glider Surveys

Gradone

Wilson

Glenn

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Fundamentally, they either decompose the different components measured by glider-mounted current profilers or rely on assumptions to ignore them. The inversion method was originally developed for ship-based lowered current profilers (Visbeck, 2002) but has been adapted for use on gliders and used extensively (Ellis et al, 2015;Gradone et al, 2021;Heiderich & Todd, 2020;Ma et al, 2019;Miles et al, 2015;Todd et al, 2011Todd et al, , 2017. This method solves a system of equations for both unknown glider velocities and absolute horizontal water velocities using least squares techniques.…”

Section: Transport From Glider-mounted Acoustic Current Profiler Deri...mentioning

confidence: 99%

Upper Ocean Transport in the Anegada Passage From Multi‐Year Glider Surveys

et al. 2023

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Caribbean through‐flow accounts for two‐thirds of the Florida Current and consequently is an important conduit of heat and salt fluxes in the upper limb of the Atlantic Meridional Overturning Circulation (AMOC). Considering there is evidence that up to one‐half of the Florida Current originates as South Atlantic Water (SAW), determining the distribution of SAW throughout the Caribbean Island passages is important as this constitutes the major pathway for cross‐equatorial AMOC return flow. The Anegada Passage (AP) is a major pathway for subtropical gyre inflow and suggested to be a potential SAW inflow pathway worth revisiting. Here, we present glider‐based observations of temperature, salinity and subsurface velocity that represent the first observations of any type in the AP in nearly 20 years. An isopycnal water mass analysis is conducted to quantify the transport of water masses with South Atlantic or North Atlantic origin. Two potentially new aspects of AP transport are revealed. The total AP transport (−4.8 Sv) is shown to be larger than previously estimated, potentially by up to a factor of two. The transport of SAW through the AP (−1.66 Sv) is also shown to be larger than previously estimated, which represents 35% of the total transport reported here and 28% of the SAW entering the Caribbean north of the Windward Island Passages. These results indicate the AP may be an important pathway for cross‐equatorial AMOC return flow. These results also provide evidence that gliders with acoustic doppler profilers are a viable method for measuring island passage transport.

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