Project size and complexityPresident and principal scientist Dr. Charles Greene has managed large multi-year acoustic studies in the Alaskan arctic involving instrument development, field measurements, analysis, and reporting. Many of these projects required frequent interaction with clients as well as with other contractors, including vessel captains, seismic crews, construction crews, and environmental monitors. In 2000 and 2001 Dr. Greene managed development of the DIFAR-based Directional Animal Monitoring System (DAMS) and its installation, testing and operation aboard a military P-3 aircraft as part of the mitigation effort for shock trials of the USS Winston S. Churchill. Meanwhile, during 1999 to 2002, senior research engineer Dr. William Burgess managed the development of the Bioacoustic Probe miniature acoustic recording tag for the Office of Naval Research, in addition performing almost all hardware and software development for the project.
Passive acoustic measurementsPassive acoustic monitoring and measurement have been the primary business of Greeneridge Sciences since its first project studying beluga calls and icebreaker noise in the Canadian arctic in 1983. Aware of the scientific and regulatory impact of its measurements, Greeneridge places great emphasis on accuracy in the selection and calibration of its equipment, and in the design, testing and application of its analysis techniques. Greeneridge uses very little "canned software," preferring to develop its own analysis tools in order to have absolute confidence in the results. In its quarter-century of operation, Greeneridge has performed over 50 separate passive-acoustic monitoring projects, studying beluga, narwhal, and bowhead whale vocalizations as well as a wide variety of vessels and military and industrial underwater sound sources. These projects have required both attended and autonomous recordings from sonobuoys, hydrophones, geophones, and microphones in air, in open water, on ice, and under ice.
Arctic and subarctic marine experienceOur key personnel have between them over 35 years of experience working in arctic and subarctic marine environments. They are familiar with the demands of these environments, including extreme and unpredictable weather, profound tidal action, varying amounts and types of ice, steep short-period seas, and uncertain timing of sea-ice freeze-up and breakup. This experience allows Greeneridge realistically to plan and execute projects in arctic and subarctic conditions.
Data handling and interpretationGreeneridge handles over 40,000 hours of acoustic data each year. To accommodate these data and the associated magnitude of analysis, Greeneridge has developed sophisticated data-handling methods using Linux disk farms networked to multiple analysis workstations.