Satellite radar interferometry (SRI) provides a sensitive means of monitoring the flow velocities and grounding-line positions of ice streams, which are indicators of response of the ice sheets to climatic change or internal instability. The detection limit is about 1.5 millimeters for vertical motions and about 4 millimeters for horizontal motions in the radar beam direction. The grounding line, detected by tidal motions where the ice goes afloat, can be mapped at a resolution of ∼0.5 kilometer. The SRI velocities and grounding line of the Rutford Ice Stream, Antarctica, agree fairly well with earlier ground-based data. The combined use of SRI and other satellite methods is expected to provide data that will enhance the understanding of ice stream mechanics and help make possible the prediction of ice sheet behavior.
18SHARESShareShareSharePrintMailGooglePinterestDiggRedditStumbleuponDeliciousBufferTumblr 2015 is almost over and it certainly has been an interesting year. Between Black Monday, Donald Trump’s Republican presidential candidacy and the Volkswagen scandal, there’s a lot to learn about the economy and your money. Here are the top 41 events of 2015 and what personal finance lessons you can learn from them.1. Interest Rate Hike TalkThroughout 2015, investors and consumers have been waiting with bated breath for the forthcoming interest rate hike. But while the Federal Reserve has said they might raise interest rates in December, the truth of the matter is you don’t know when rates will change.Interest rates affect every aspect of American finance from the government’s budget down to your personal checking account. “Interest rates affect consumers because people use debt to fuel purchases. When rates are low it’s a great time to get a loan or use a credit card,” said Tiffany Welka, vice president of VFG Associates. For consumers on tight budgets, she suggested reviewing your finances to see how a potential rate increase could affect your finances. continue reading »