A 26-year record of depth integrated primary productivity (PP) in the Southern California Current System (SCCS) is analyzed with the goal of improving satellite net primary productivity (PP) estimates. Modest improvements in PP model performance are achieved by tuning existing algorithms for the SCCS, particularly by parameterizing carbon fixation rate in the vertically generalized production m...

Underwater acoustic sensor networks (UASNs) have become a hot research topic. In UASNs, nodes can be affected by ocean currents and external forces, which could result in sudden link disruption. Therefore, designing a flexible and efficient link disruption restoration mechanism to ensure the network connectivity is a challenge. In the paper, we propose a glider-assisted restoration mechanism wh...

We understand a sociotechnical system as a multistakeholder cyber-physical system. We introduce governance as the administration of such a system by the stakeholders themselves. In this regard, governance is a peer-to-peer notion and contrasts with traditional management, which is a top-down hierarchical notion. Traditionally, there is no computational support for governance and it is achieved ...

Most AUVs, and particularly Autonomous Underwater Gliding Vehicles (AUGV), must remain in motion or maintain neutral buoyancy at controlled depths with little or no propulsion. The ability to be both mobile and bottom-resting creates many desirable features in a glider. A mobile to stationary conversion will allow a traditional, bottom mounted sensor platform to be deployed from over the horizo...

The U.S. Navy’s use of tactical mid-frequency active sonar has been linked to marine mammal strandings and fatalities [Evans and England, 2001]. These events have generated legal challenges to the Navy’s peacetime use of mid-frequency sonar, and have limited the Navy’s at-sea anti-submarine warfare training time. Beaked whales may be particularly sensitive to mid-frequency sonar. A mobile, pers...

Radio communications between an Autonomous Underwater Vehicle at sea and shore-based base-stations faces considerable challenges particularly if the antenna on the vehicle does not rise high enough above the water surface. At distances comparable to the maximum line-of-sight distance to a base-station at a given height, situations may occur where the local relative sea wave heights produce inte...

[1] An abrupt mixing event in the upper ocean is investigated in the Northwestern Mediterranean Sea using gliders, a new ocean monitoring technology, combined with regional atmospheric model outputs and mooring data. Intense winds (up to 20 m s ) and buoyancy forcing during December 2009 induced strong vertical mixing of the upper ocean layer in the Balearic Sea. High-resolution data from a coa...

The game of three-dim ensional Life, a cellular automaton th at exhibits in t hree dimensions properties similar t o J ohn Conway 's famo us two-dimen-siona l game, was discovered in 1986. Four "life supporting" rules in th e cubic universe have been found. T hese are Life 4555, Life 5766, Life 5655, and Life 6855. T he first two numbers give t he range of living neighb or cells perm itted for ...