They have found a net decrease in Arctic ice extent of 2.9 percent per decade since 1978. Although sea ice has increased in some regions, the Arctic has witnessed a net decrease in sea ice. By identifying these periods of rapid change in the microwave data, the occurrence and variability of melt onset can be monitored. We're looking for trends, because they will tell us whether a climate signal exists. Another advantage of satellite technology is that it enables researchers to acquire data in remote areas.
Glaciers are far away and dangerous places to be.
More comprehensive data might provide specific information to illuminate why Arctic ice is thinning. Because Earth's climate is determined by interactions among the sun, atmosphere, oceans, and lands, it is likely that the answer lies in a conglomeration of factors. Scientists are only beginning to understand the complexities, but Rothrock's findings underscore the need for more research.