Secular Trends in GRACE Data

GRACE has now provided over five years of monthly gravity field solutions. During this time, analysis techniques have been steadily improving. And as more users have applied GRACE data to an increasing variety of geophysical problems, the capabilities and limitations of GRACE have become better understood. As the data span lengthens, secular trends emerge more clearly above shorter-period variability and become easier to identify. Here, we present a global survey of secular trends in the GRACE data. We show current results for such familiar signals as those caused by ice mass variations in Antarctica and Greenland, and by post glacial rebound in northern Canada and Scandinavia. We also show evidence of a number of smaller and lesser-known signals.