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首页> 美国政府科技报告 >Measurements in the Yucatan-Campeche Area in Support of the Loop Current Dynamics Study.
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Measurements in the Yucatan-Campeche Area in Support of the Loop Current Dynamics Study.

机译：Yucatan-Campeche地区的测量支持环流动力学研究。

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Three years of direct near-surface to bottom current measurements at the western Yucatan Channel (defined west of 85.6oW) between 2008 and 2011 capture the main characteristics of the Yucatan Current. Average current structure shows a high degree of consistency over time, with mean near-surface velocities of about 1 m/s, decreasing significantly with depth. The current core position varies between 86.4oW and 86oW and the mean current is stronger than the variability. Below 1000m depth, current velocities are below 0.1 m/s and variations and mean flow have similar magnitude. Current velocity near the bottom increases slightly in the center of the channel, which has been shown to be related to the Loop Current dynamics. Further north, the western edge of the Loop Current was monitored with four moorings during 22 months (PE section, June 2009–April 2011); the average current there was lower than that obtained through the Yucatan Channel (0.75 m/s in its core) with variability as strong as the mean current. Five more moorings were deployed over the shelf break and slope north of the Campeche bank (PN section) between March 2008 and May 2011. Current orientation along the Yucatan slope follows the topography with an increased flow near the bottom relative to the flow aloft. This feature observed in the deepest moorings, suggests the presence of Topographic Rossby Waves. The core of the Yucatan Current and Loop Current was observed to have a more offshore position in summer, moving back westward, toward the shore in winter-spring, suggesting a possible seasonality of the current meanders. Measurements at western Yucatan Channel and PE sections, as well as satellite data, indicate that these current meanders are associated with periods of positive horizontal shear (cyclonic vorticity anomalies) propagating northward from the Caribbean coast of Mexico into the Gulf. An important result of this work is that current meanders are related to Loop Current Eddy detachments, because four of the five Loop Current eddies released between 2008 and 2011 were found to be related to the propagation of negative anomalies of SSH along the Yucatan coast crossing the Yucatan Channel producing intense pulses of eddy kinetic energy in the Loop Current as observed at PE section.

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