A Rhode Island-size ice field in the mountains behind Alaska’s capital could disappear by 2200 if climate-warming trends continue, according to a University of Alaska Fairbanks study. The study published this week by the Journal of Glaciology predicts 60 percent of the ice in the Juneau Ice Field could be gone by 2099. The Juneau Ice Field is the source for a major Alaska tourist attraction, the Mendenhall Glacier, visited last year by 450,000 people at a U.S. Forest Service center. By 2099, the study authors said, the glacier’s ice will be harder to find. …