GLOBEC long-term moored effort: Five years
of moored observations on the southern flank of Georges Bank
James D. Irish, Ph.D.
Woods Hole Oceanographic Institute
Wednesday, January 19, 2000
3:00 p.m.Pacific Forum
The U.S. GLOBEC program is trying to understand the underlying physical and biological
processes that control the abundance of key populations of marine animals in space and
time. The Northwest Atlantic/Georges Bank Program is focused on the pelagic life stages of
cod and haddock and their major prey, Calanus finmarchicus and Pseudocalanus.
The long-term moored effort is collecting time series observations (in conjunction with
shipboard, more detailed process studies, satellite and drifters). We are studying the
temporal variability of the atmospheric forcing and its relationship to the resulting
water property, stratification and circulation variability on Georges Bankeventually
evaluating its effect on the biology.
A mooring was maintained for five years on the southern flank of Georges Bank in 76
meters of water. Preliminary results show the large variability on tidal, annual, and
inter-annual scales. Strong intrusive signals (warm core rings and Scotian shelf water)
were partially averaged across (subjectively) to show the long-term trends of the water
properties plotted below. Temperatures show annual heating in summer and cooling in
winter. In 1995 and 1999 warm core ring effects were persistent enough that they showed up
as apparent warmer years. The salinity varies around 33 with a 6-month cycle until the end
of 1995. During the first half of 1996 the salinity decreases 1 to 32. From mid-1996 to
mid-1997 the salinity increases to 32.5; then from mid 1997 to 1998, it decreases again to
below 32. From mid-1998 until the end of the deployment, the salinity again shows a rise
to above 32.5.
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Last updated: December 19, 2000