Glaciers and Global Warming | MconneX | MichEpedia


My research involves looking at how ice sheets and glaciers break One of the things that we observed right around 2002, which was shocking, was the Larsen Ice Shelf, the entire peninsula, it’s a tiny little ice shelf But as far is anybody knows, it sat there there happily for ten thousand years, possibly a lot longer Then, over about six weeks, culminating in March 2002, The entire ice shelf completely disintegrated So it’s just gone And so we have these extremely rapid events that have potential to change the picture that… what we’ve always thought about ice sheets is that they change really rapidly When you think about things over a century we normally ignore the ice sheets like we used to because it’s gonna change really slowly That’s the way we’re used to thinking about it But this type of event completely upended our thinking about that that you could have really rapid changes that occur over days, weeks, maybe even less than a day So these are pretty dramatic changes We have an idea; we have a theory about how it’s happened, but we can’t predict it yet What are the likelihood that it happens to different ice shelves? What if it happens to one of the really big ice shelves? Then what’s gonna happen? We know that ice sheets are these huge masses of ice, and they’ve been there for a long time.

And we have smaller glaciers that have also been there for a while but not quite as long And the way they lose mass is they can either melt, or bits of ice can break off and if it’s in contact with the ocean, they float away and then they eventually melt And it turns out, for the major ice sheets Greenland and Antarctica, a significant portion of their mass is lost by breaking, by iceberg calving-is what we call it it’s about fifty percent maybe as high as seventy percent But it’s very uncertain; it’s a huge amount of mass and it’s really significant because we’ll occasionally get these icebergs that are the size of Massachusetts close to the size of texas sometimes the break off oversight then they float off paidcontent rupturing lanes eventually built into the ocean and is an important process that we need to understand the biggest question that we’re looking back is really how much age she scan contrary to seal to arise over the next century cell you’ve lived close to the ocean you probably want to know if segal was gonna rise by a meter or two which is the upper end of the estimates or maybe only five or ten or twenty centimeters which seems unlikely given what we’ve observed but we can entirely rule out this is one piece twelve the facts of global warming and one piece of intact open we don’t really understand how increased surface temperatures capture temperatures or function temperature taken effect if you move it up but there or hot water close to the asians we know what’s going on and leaving so is the big part of that and what do you start melton there’s going to get your adding fresh walking for changing the system and with the positive and negative feedback is interesting but we don’t know willful.