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1 cze 2020 · Boundary currents are energetic features of the global ocean, contributing significantly to meridional mass, heat, and salt transports and yet they are poorly resolved in global hydrodynamic models, sparsely measured by global observing systems, and the literature on the underlying dynamical balances is modest.
1 kwi 2022 · Subaqueous density currents in nature behave similarly and are exemplified by those that flow along the bottom of the oceans as a result of their excess density with respect to the ambient water. This density difference usually arises from local temperature gradients or high concentration of salt.
Caused by differences in temperature and salinity, the varying densities of ocean waters are major forces in producing deep ocean currents. Consider the water in an environment such as that deep under the ice around the antarctic. It is so cold that salt water is taken up to form ice.
• Investigate the forces that drive surface currents in the world’s oceans. • Identify major ocean gyres and their physical properties — temperature, speed, and direction. • Correlate current direction and speed with global winds. • Examine ocean salinity and temperature patterns and their relationship to deep-water density currents.
Two of the most important characteristics of seawater are temperature and salinity – together they control its density, which is the major factor governing the vertical movement of ocean waters. Temperature Distribution in the Ocean. The temperature of seawater is fixed at the sea surface by heat exchange with the atmosphere.
Two major factors determine the density of ocean water: salinity (the amount of salt dissolved in the water) and temperature (Figure 14.16). The more salt that is dissolved in the water, the greater its density will be.
11 mar 2010 · In April the flow was strong, the interface was over 500 m high in the center of the channel, and the density of a seawater sample at atmospheric pressure minus 1000 kg m −3, σt, and θ at 1200 m were 27.94 kg m −3 and 2.78°C, respectively ( Figure 3a ).
