This cruise report covers scientific operations conducted during RV Oceanus OC459-1. Mooring<br/>operations conducted on RV Ronald H. Brown RB10-09 are given as an Appendice. Cruise<br/>OC459 departed from Woods Hole on 23rd March 2010 and arrived in Freeport, Grand Bahama on<br/>04th April 2010.<br/>The purpose of the cruise was the refurbishment of an array of moorings off the coast of Abaco<br/>Island, Bahamas at a nominal latitude of 26.5°N. The moorings are part of a purposeful Atlantic<br/>wide mooring array for monitoring the Atlantic Meridional Overturning Circulation and Heat<br/>Flux. The array is a joint UK/US programme and is known as the RAPID-WATCH/MOCHA<br/>array. Information and data from the project can be found on the web site hosted by the National<br/>Oceanography Centre Southampton http://www.noc.soton.ac.uk/rapidmoc and also from the<br/>British Oceanographic Data Centre http://www.bodc.ac.uk.<br/>The RAPID transatlantic array consists of 24 moorings of which 21 are maintained by the UK,<br/>and 17 bottom landers of which 15 are maintained by the UK. The moorings are primarily<br/>instrumented with Sea-Bird self logging instruments measuring conductivity, temperature and<br/>pressure. Direct measurements of currents are made in the shallow and deep western boundary<br/>currents. The bottom landers are instrumented with bottom pressure recorders (also known as tide<br/>gauges), measuring the weight of water above the instrument.<br/>The RAPID naming convention for moorings is Western Boundary (WB), Eastern Boundary (EB)<br/>and Mid-Atlantic Ridge (MAR) indicating the general sub-regions of the array. Numbering<br/>increments from west to east. An L in the name indicates a bottom lander, M indicates a minimooring<br/>with only one instrument, H indicates a mooring which is on the continental slope and is<br/>instrumented over a limited depth range. During OC459-1 we recovered and redeployed: WB1,<br/>WB2, WB6, WBH2, WBADCP, WB2L4 and WB4L4. WBAL1 was deployed on OC459-1.<br/>Mooring WB4 was recovered and redeployed on RB10-09.<br/>On OC459-1, CTD stations were conducted at convenient times throughout the cruise for purposes<br/>of providing pre and post deployment calibrations for mooring instrumentation and for testing<br/>mooring releases prior to deployment. Shipboard underway measurements were systematically<br/>logged, processed and calibrated, including: waves (spectra of energy and significant wave<br/>height), surface meteorology (air pressure, temperature, wind speed and direction and radiation<br/>(total incident and photosynthetically active), sea temperatures and salinities, water depth and<br/>navigation. Sea-water samples from CTD stations and of the sea-surface were obtained for<br/>calibration
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