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Inlet Sampling Statistics

One of the first steps in the construction of the time series of deep water properties was to determine which inlets had been sampled most consistently and most often - the sampling statistics for the BC inlets. The IOS electronic data archive was searched for all data holdings in the geographical area corresponding to the major inlets of the BC coast. In some cases smaller but significant inlet areas were also searched. The data holdings from individual inlets were then summarized by time in the form of sampling histograms depicting the length of the time series and number of samples per year. The table below summarizes the sampling statistics for the best sampled inlets, and the diagram that follows depicts geographically the sampling statistics in terms of total number of stations or profiles taken in the different inlets.

Regional Descriptions

Georgia Basin Inlets (Saanich, Indian Arm, Howe Sound, Jervis, Bute)
  • the best sampled inlets of the BC coast. 

West Coast Vancouver Island Inlets (Alberni, Muchalat, Neroutsos and Rupert-Holberg)
  • the inlets of this coast have fragmented times series with long gaps 
  • in Alberni Inlet, the deep waters have a significant annual signal which obscures long term trends 

Central and North Coast Inlets (Knight, Douglas - Kitimat, and Observatory)
  • with the exception of Knight Inlet, sampling is very sparse 
  • an appreciable annual signal in the deep waters of Knight inlet may obscure long term trends 
  • Observatory Inlet and Alice Arm have large number of samples but almost all were takenin a 3 year period 

Haida Gwaii
  • sampling is very sparse

Table of Sampling Statistics for the Better Sampled Inlets

Inlet Number of stations Length of Time Series Comments Histogram
Saanich Inlet 1560 47 years 3 year gap in late 50's
earliest measurements in 1930
Saanich inlet sampling satistics
Jervis Inlet 1000 49 years 1 and 2 year gap Jervis inlet sampling statistics
Indian Arm 1350 45 years 4 year gap from 1964-67 Indian Arm sampling statistics
Howe Sound 860 48 years several 1 or 2 year gaps
half of stations inside sill
Howe sound sampling statistics
Bute Inlet 750 50 years many 2 and 3 year gaps in the 80's and 90's Bute inlet sampling statistics
Knight Inlet 1260 50 years some 1, 2 and 3 year gaps Knight inlet sampling statistics
Muchalat Inet 250 42 years many gaps, one gap is 5 years in length
earliest measurement in 1933
Muchalat inlet sampling statistics
Alberni Inlet 1540 31 years several 1, 2 and 3 year gaps
two main basins
earliest measurements in 1937
Alberni inlet sampling statistics
Portland and Observatory Inlets and Alice Arm 2200 20 years almost all samples taken in 3 year period form 1981 - 1983
many gaps

Map of Sampling Statistics for Individual Inlets