I'm writing a scientific paper in which I'm describing a process affecting the sliding of an object (a glacier in this case). This process resists both acceleration and deceleration. I'm currently saying that it acts as a "buffer" but I feel that doesn't properly describe the property I'm referring to.
Are there other nouns (or phrases) that can be used in this case?
Here is the paragraph in its current form for more context:
Isolated cavities display persistent high water pressures, often close to overburden. Therefore, under steady basal sliding speeds, they would offer little resistance to movement. However, their fixed volume would result in a pressure drop if sliding accelerates, or a pressure increase if it decelerates. In other words they can act either as sticky spots when basal sliding speeds up or as slippery spots when it slows down, working as a buffer for basal sliding variations.