Environmental conditions

The mean stratification (box averaged over 24 hrs.) at mooring A is shown in fig. 2(a). Fluctuations are of the order of a few tenth of $\sigma_t$.

The mean stratification was more variable at mooring C (fig. 2(b)), with an initial weakening followed by a strengthening towards the middle of the deployment (the time series is shorter due to instrument failure???).

The variability in forcing is associated to the lunar cycle through the Spring/Neap cycle. Fig. 2(c) shows the pressure recorded at location C during the deployment. The phase difference throughout the basin is quite small, so this time series is representative of the elevation in the Bay. The strongest forcing occurred at the end of the first week of deployment. Embedded in the fortnight modulation we have a diurnal oscillation, as the forcing of ISWs propagating in Massachusetts Bay is proportional to the difference between the high tide and the next low tide.