Ocean conditions are playing tricks on Hood CanalJune 30th, 2010 by cdunagan
Hood Canal continues to baffle us humans with scenarios that we have never seen before, as I outline in a story in today’s Kitsap Sun. The canal’s latest failing is to forget that, by this time of year, there is supposed to be a layer of dense, oxygenated water lying on the bottom.
I’m being facetious, of course, about how the canal is “supposed to” behave. The fact that researchers are seeing something for the first time in Hood Canal does not mean it has never occurred before. And the fact that natural conditions can be highly variable does not mean that human inputs of nitrogen have no influence over the life or death of sea creatures.
As it has been explained to me, in years when natural conditions push Hood Canal close to the danger zone, human factors can push it over the edge. So limiting nitrogen flowing into the canal can make a real difference, especially in years when natural factors gang up to deplete the oxygen supply.
As I explained in some detail in today’s story, conditions in Hood Canal the past 18 months have been interesting to watch. Early in 2009, the average dissolved oxygen in the canal was near record highs, then the level dropped rapidly to measurements at or below what is normally seen in the fall. Over the winter, the levels never came back up — which is something never observed before. Now the levels are beginning to drop again, and we don’t know how low they will go.
What is encouraging about all the monitoring and studies conducted the past few years is that we can actually measure what is happening in real time, and we are in a better position to explain why the canal is responding as it does. Now if only we could predict the weather and ocean conditions, which seem to have a mind of their own …