Digital Access

Digital Access
Access nwherald.com from all your digital devices and receive breaking news and updates from around the area.

Home Delivery

Home Delivery
Local news, prep sports, Chicago sports, local and regional entertainment, business, home and lifestyle, food, classified and more! News you use every day! Daily, weekend and Sunday packages.

Text Alerts

Text Alerts
Stay connected to us wherever you are! Get breaking news updates along with other area information sent to you as a text message to your wireless device.

Email Newsletters

Email Newsletters
We'll deliver news & updates to your inbox. Plan your weekend and catch up on the news with our newsletters.
State

Reports shed light on Great Lakes water levels

TRAVERSE CITY, Mich. — Scientists are reporting new findings about the relationship between evaporation, precipitation and changing water levels in the Great Lakes.

In a paper being released Tuesday, researchers say the role played by ice that covers sections of the lakes during cold winters is more complex than previously believed.

Lead writer John Lenters of the Ann Arbor consulting firm LimnoTech says ice doesn't simply act as a "cap" that limits evaporation in winter. It also cools lake temperatures and helps delay the onset of evaporation later. But heavy evaporation can occur shortly before ice forms.

The other study by the University of Wisconsin says large-scale atmospheric patterns played a role in regular ups and downs of water levels until the late 1990s, when they began a slump for reasons that aren't clear.

Loading more