• GUESTS

    If You  want access  to member only forums on FM, You will need to Sign-in or  Sign-Up now .

    This box will disappear once you are signed in as a member.

  • WE CREATE LONG TERM, MEANINGFUL RELATIONSHIPS IN HERE ... PLEASE JOIN US.

    You know what we all love...

    RECEIVE THE GIFTS MEMBERS SHARE WITH YOU HERE...THEN...CREATE SOMETHING TO ENCHANT OTHERS THAT YOU WANT TO SHARE
    When you enchant people, you fill them with delight and yourself in return. Have Fun!!!

Sign in to follow this  
SKIPPERS KID

Study Finds Nitrates up in lake Superior

Recommended Posts

SKIPPERS KID

Study finds nitrates up in Lake Superior

John Myers Duluth News Tribune

Published Thursday, May 31, 2007

The level of nitrates in Lake Superior has increased five-fold over the past 100 years and continues to increase at a steady rate, a University of Minnesota study has found.

The study, published today in the journal Geophysical Research Letters, found that the nitrate isn’t necessarily coming from the expected culprits.

The increase in nitrates has been steady in the big lake, not reflecting the rapid increase in fertilizer and fossil fuel use and over the past 50 years.

RELATED CONTENT

John Myers Archive

“The assumption has been for years that we’re getting atmospheric deposition from agricultural fertilizer and fossil fuel combustion. But the increase in the lake water doesn’t correlate with what is falling from the sky,’’ said Robert Sterner, chief researcher on the project for the University of Minnesota. “The nitrate in the lake can’t be accounted for by what’s falling from the sky.’’

Sterner said it’s unclear where the nitrates are coming from. They could be produced by a natural process in the lake, or from some other source of nitrogen. It’s not coming large amounts di-rectly from urban or agricultural runoff because most of the lake’s watershed is forested, Sterner said.

Most lakes use up their own nitrogen through plants. But with so few plants in Lake Superior, the nitrogen keeps building, Sterner said.

The level of nitrates in Lake Superior now sits at 25 micromolars, up from 5 micromolars in 1906. It would take levels above 700 micromolars of nitrate to be considered unsafe for human drinking water. A micromolar is a concentration of one-millionth molecular weight per liter.

While nowhere near a threat to people, it’s unclear what effects increased nitrates may have on other parts of the ecosystem or why they continue to increase. Sterner and other University of Minnesota scientists plan to look at the relationship of nitrate to Lake Superior’s unusual level of carbon use over carbon production.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

Announcements



  • Your Responses - Share & Have Fun :)

    • Better Than Working!
      Not seeing any reports from Mille Lacs so here is my 1st report! Hit the pond Saturday afternoon for a few hours of getting the rust off the boat, equipment and skills. Found the fish in cabbage in 10-12 feet of water. Trolling stick baits 2.0 - 2.3 mph. Only got 4 walleye (24", 25" and two 28") but they were very healthy! Not bad for a few hours of fishing! Good luck out there and make some memories!
    • fish_time
      Who hates when your monofilament line wants to come off your reel. Let me share some tips and tricks with you on spooling your reel and help fixing this problem. https://youtu.be/CkFtOHn9nm0
    • Wakemup
      65-66 in Norwegian yesterday and 63 in Niles.
    • Wanderer
      Ely area lakes were showing 69-71 today.  That was a warmer than expected surface temp but I doubt it goes very deep.  Very little spawn activity compared to past years for this weekend.
    • eyeguy 54
      I like the stretch upriver better but can only drift down that area.  I would wear my arms out traveling up stream!   Hopefully do a drift down soon.  
    • jhousenga
      59 crossing Daisy Bay Friday night. 67 in Big Bay this afternoon.
    • monstermoose78
      The stearms in the arrowhead are small very small I would recommend a 6 foot or short rod for most streams as you will be pitching your bait out. They are also over grown with brush wading these streams is a challenge. You will be fishing for mostly brook trout above the first posted boundary FYI it’s normally a large water fall but not always. Also the first week of June there will not be much from the lake to the first posted boundary anyways. Remember there special regs below the first posted boundary and the above the first posted boundary.  If you want to use your fly rod I would hit the small trout lakes in the area. A split shot and small chunk of crawler is my go to bait for Brookies. There are a few streams with some browns and rainbows but very few. If you are fly fishing look at Thompson lake by  devilstrack lake it’s catch and release. Mink lake, kimball lake are also good. 
    • Squirrelhawke
      Growing up in South Dakota I did quite a bit of fishing in the black hills for browns and rainbows, most of that fishing was best accomplished with a long pole and just drifting my bait down the stream if you can read the eddies and slacks in the water you should do fine.  Of course I'm assuming they bite the same up north as they do out west.  It was a kick when I went  back out there 2 years ago and on Sunday morning fished the little 6 ft wide stream running behind the campground, all the other campers were amazed that I would pull out a fish about every 20-30 ft no monsters but plenty of little beauties at 7-10 inches. If the water is clean and the fish are there you just gotta find out what they are eating at that time of year.  Hopefully this helps and if I'm wrong some of the guys with Minnesota experience will pipe up. 
    • Squirrelhawke
      I do a bit of fishing from the coon rapids dam on down to 694 and I usually bring 2 rods because I lose at least one lure to the rocks. Bear that in mind and also realize that there are nice smallies, eyes and cats in that stretch of river. I also had over 3 feet of pike eat my stink bait I had out for channel cats. If I didn't have a circle hook on it would have been a nice pic to share. Good luck and hope to hear of some good luck. 
    • delcecchi
      It would take a lot of code to make multiple windows tiling the screen work, would be my guess, and would create few additional sales so isn't worth the expenses.    Just pick up an inexpensive 5 to 7 inch unit and use it for the map.