October 31, 2015 — The coastal ocean and its fisheries have played a huge role in the cultural and economic development of Cape Cod. Yet recent changes in the atmosphere and deep ocean threaten the natural rhythms that govern the ecosystems of the shallow waters surrounding Cape Cod.
One factor affecting the coastal ocean in the northeastern United States is a change in the motions of the atmospheric jet stream. We felt the effects during the past winter, which was exceptionally cold and snowy. In recent years, the north-south movements of the jet stream have been increasing. However, the eastward motion has been stalling, resulting in more persistent weather patterns – cold or warm – that affect the temperature distribution in the coastal ocean.
In early 2015, the jet stream dipped well southward of its normal position and stalled, bringing a steady burst of storms moving along the coast and cooling the coastal ocean. By contrast, the jet stream remained well north of its normal wintertime position in the winter of 2011-2012 so that warm air remained over New England for much of the winter. As a result, spring water temperatures were much warmer than usual, 3-4 degrees Fahrenheit above normal over a six-month period, and as high as 10 degrees Fahrenheit for short time periods.
Research at Woods Hole Oceanographic Institution found temperatures of continental shelf waters in 2012 off New England were the highest they’ve been in 150 years of measurements.
Read the full story at The Metrowest Daily News