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Metalimnetic Oxygen Minima in Green Lake, WI

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Monday, February 11, 2019, 3 pm

This is a past event.


Environmental Engineering Graduate Seminar


Mahta Naziri Saeed, MS Student, Environmental Engineering, Michigan Technological University



Big Green lake is a drainage lake in Green lake county, WI. It is the deepest natural inland lake in Wisconsin. Metalimnetic Oxygen Minima (MOM) is currently occurring in Green Lake. Usually the anoxic region would be located at the bottom layers of a stratified lake, where oxygen consuming processes deplete the finite pool of oxygen isolated from atmospheric exchange or photosynthetic processes. However, metalimnetic oxygen minima forms at upper layers known as metalimnion. The reason for studying Green lake is that this situation, is getting worse and the dissolved oxygen level is falling bellow the criteria and therefore, it was listed as impaired by the Wisconsin Department of Natural Resources. We have done some sampling to measure the oxygen level in different layers, to get a pattern of what’s happening in different layers of the water column, as well as studying the reasons that may cause this phenomenon.

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