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Annual Averaged Deep Water Anomalies For All Inlets

Time series of deep water anomalies facilitate the comparison of deep water variations amongst the inlets. For individual inlets, the time series of deep water anomalies was calculated as the departure of the annually averaged deep water property from the mean of the time series from 1951 to the present. Anomalies for temperature and salinity are shown below. No anomalies were computed for the dissolved oxygen of the deep waters.

Temperature Anomalies

  • The time series of deep water temperature anomalies from all of the better sampled inlets show an overall increase of about 0.5 to 1 C since the mid 70's 
  • The rise in temperature is more consistent in the last 20 to 25 years than in the first half of the time series 
  • In the first half of the time series there are temperature variations of ~0.5 C on time scales of 5 to 10 years 
  • Some of inlets (Jervis and Bute) show significant coherence over the 50 year time span 
  • The shallower silled inlets like Indian Arm and Howe Sound exhibit larger amplitude variation in their deep water properties 
Anomalies_all_inlets_Temp

Salinity Anomalies

  • The time series of deep water salinity anomalies do not show any overall trend over the almost 50 year time span
  • Jervis and Bute show significant coherence over the 50 year time span
  • The shallower silled inlets like Indian Arm and Howe Sound exhibit much larger amplitude variation in their deep water properties