A 4000-meter-rated deepwater cabled ocean observing system: Lessons learned from two years of operation

Ingle, Stéphanie; Belabbassi, Leila; Vall, Ken du; Potter, Doug; DiMarco, Steven F.; Wang, Zhankun

doi:10.1109/oceans.2012.6404959

Cited by 1 publication

(2 citation statements)

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“…Deployed in summer 2005 in the Sea of Oman off the northern coast of Abu Bakara, Sultanate of Oman between the 65-and 1050m isobaths (Figure 1A), the Lighthouse Ocean Research Initiative (LORI) system, designed and operated by Lighthouse R&D Enterprises, Inc (DiMarco et al, 2012;Ingle et al, 2012;Wang et al, 2013b), provided real-time measurements of currents, temperature, salinity, pressure, dissolved oxygen, and turbidity. The LORI system was the first cabled seabed observatory in the study region.…”

Section: Methodsmentioning

confidence: 99%

“…In this manuscript, we will first report observations of seasonally recurrent hypoxic/anoxic conditions found in the Sea of Oman over the region of the northern continental shelf and slope of Oman using five continuous years of hourly current velocity and dissolved oxygen measurements from a cabled observing system (DiMarco et al, 2012;Ingle et al, 2012). We then examine the causes of the seasonal hypoxia in relation to monsoonal driven seasonal upwelling/downwelling and the seasonal extension of the OMZ into the coastal regions.…”

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confidence: 99%

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Monsoon-driven seasonal hypoxia along the northern coast of Oman

DiMarco,

Wang,

Chapman

et al. 2023

Front. Mar. Sci.

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Dissolved oxygen and current observations from a cabled ocean observatory in the Sea of Oman show that the annual recurrence of coastal hypoxia, defined as dissolved oxygen concentrations ≤63 μM, is associated with the seasonal cycle of local monsoon winds. The observations represent the first long-term (5+ years) continuous moored observations off the northern Omani coast. During the summer/fall southwest (SW) monsoon season (Jun-Nov), winds in the Sea of Oman generate ocean currents that result in coastal upwelling of subsurface waters with low dissolved oxygen concentrations. The source of the poorly oxygenated water is the oxygen minimum zone (OMZ) in the Arabian Sea, a layer approximately 1000-m thick within the 100 to 1200 m depth range, where dissolved oxygen values approach anoxia. During the winter monsoon season (Dec-Feb), the Sea of Oman winds are from the northwest, forcing strong and persistent southeast currents. These winds generate oceanic downwelling conditions along the coastal ocean that ventilate waters at depth. Possible impacts of the monsoon-driven seasonal hypoxia on local fisheries and implications due to climate change are also discussed in this study.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%