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July Cruise to Effingham, Clayoquot and
Nootka Sounds
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July 13-30th 2007
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I led a research cruise to the Pacific Northwest in July, 2007 to
study the unique range of redox environments found there. The west coast
of Vancouver Island is an interesting place to study the influence of
different O2 levels. There are a whole series of bays with different O2
concentrations in their bottom waters. Effingham Inlet is nearly always
anoxic (no oxygen) year round and is a good place to examine a
"classical" anoxic basin. Deer Bay in Clayoquot sound is anoxic most of
the time, but trends towards oxic during the late summer when the bottom
waters get exchanged. When we went there in April, the bottom waters had
no O2 but still had nitrate, which is our definition of suboxic. By
July, the bottom waters had no nitrate but instead had hydrogen sulfide,
an indicator of anoxic waters. Nearby Tofino Bay is generally oxic
year-round. We had heard that Nottka Sound was also anoxic, and went to
take a look. We did not find anoxic or suboxic waters there but found a
good deal of stratification, suggesting that this area goes seasonally
suboxic at least.
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More data to come |
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