Assuming that the weather really is doing weird extremes ........ ( which may simply be modern communications & reporting bias ) this is exactly what I was taught decades ago happens when we go mini-ice age. Not what happens when it warms by historical records.
Still, if it's going to get cold by 2030 I have a shot at missing the upcoming freeze. So I'm having a bacon & peanut butter sandwich for breakfast.
Can anyone even accurately measure "sea level"? Continents move and elevations creep. There's no telling what goes on way waaaay down below the surface. The deep places of the earth, where no man has been, may be moving and buckling and opening and changing the surface area of the "container" that holds the seas. Telling how high the tide is seems a far stretch from telling how much water is actually in the ocean. And telling how much water is in the ocean still doesn't tell you where it comes from. We need to dye all glaciers with food coloring, and then take annual opacity readings from the ocean to get a better idea of what's going on.
Can someone please explain how "global warming" is causing the change in sea levels? OK, I know that warm weather melts ice, and causes water to expand. The thing is, the sea level has had about the same rate of change before and after our current warming period.
I think we may need to consider that when you take an ice cube out of the freezer and place it in the sink, it doesn't melt immediately. The same is true for giant ice cubes left over from the past ice age. Find any realistic estimate of how long it would take to melt the ice of Greenland, and you will find that we are looking at thousands of years, even with the gloom and doom predictions of the global warmists. The simple reality is that it isn't done melting from the emergence from our last ice age. To study such things in nature and expect them to be static is ridiculous. To associate such changes with man made catastrophe is equally ridiculous without proper evidence. Recent actual temperature measurements are the best we have ever had in history, and they have shown that global temperature has been roughly at a plateau for roughly the last two decades. Until you have an acceptable explanation for that pause in the warming, trying to attribute things to the warming that hasn't happened is simply ludicrous. Continuing to blame it on CO2, which has continued to rise, is also ludicrous.
Stays the same ( less evaporation and other ) if you put an ice cube in a glass, then fill with water to the brim, it'll still be at that level, more or less, when the ice melts. Won't overflow.
However, if you fill a container with ice cubes & water, with a lip or overhang to hold the ice partially submerged, the level will fall, as will the level in a container you froze water in. So, easy mistake.
Ice floats because otherwise the planet would be a frozen ball until the Sun expands. ( the Anthropocentric version )
Right. Equal weights of water ice and liquid water...wait for it...displace the same amount of water. The volume of the water ice is greater but the submerged volume is the same. When it melts, the level stays the same. However, sea water is denser than the fresh water in the ice, so the ice rides a bit higher in sea water.
The problem I have is when a large number of people are using the wrong data and assumptions, ( which must be the case when the models fail to predict the past ) and some people are outright lying about the data, ( M Mann and the Hadley CRU ) it's hard to know what the correct, and uncorrected data is.
Sea levels have certainly rose, and are rising, as a result of the interglacial warming period we find ourselves in today. ( along with every scrap of recorded history )
Are they rising faster? Don't know. I've been told they are, by people I don't trust, and told it's not so, by people I have no reason to trust.
I would guess the rate of change has not materially changed.
However, even if we do get a mini ice age, for the next 35 years, the oceans will continue to rise. On average. Over time. Until the next major ice age.
I certainly wouldn't expect a structure at sea level to not be under water in a more or less distant future.
If I lived by the Sea, I'd consider that in my plans. Nations do too. When is lower Manhattan going to be flooded? How high does the water have to get to wreck the tunnels for power, water, gas, people?
The REAL problem with the people that endlessly predict environmental disaster, who overstate the dangers or the damage done by pollution or Human activity, is they can make people forget that there are real environmental problems we should be devoting our time and money on.
Like soil use. Todd mentioned that as a problem, and he's right. It's a problem worth discussion.
And WTF is up with the Bees? Seriously, If we have to stop using a pesticide and accept higher losses with a less effective one, it's a rational trade off since having no Bees will cost us far more.
Or what's the cleanest way to power our civilization? And how can we help the rest of the planet skip over the dirty parts and get rich enough to live cleanly?
Sea level is lowered when precipitation on higher elevations remains trapped on the terrain in the form of enduring slow-moving glaciers thousands of feet thick. See the Scientific American link above.
If the glacier warms a bit then the coefficient of friction at the base is possibly changed resulting in the glacier moving faster down the elevated terrain toward the sea. Glacial melt water could be a lubricant at the base, duh! More lubricant probably not helpful
Ice floating has little effect on the sea level unless it is new ice entering the sea from land at an accelerating rate. It does not have to melt in the least, it just has reach and enter the sea.
The vast glacial ice on Greenland and Antarctica are moving toward the sea constantly. If that rate of movement were to increase then there would be the possibility of a relatively brisk change in sea level.
Rising sea level means more surface area absorbing heat which means more possibility for evaporation which means more precipitation. More precipitation means more snow or weight on the tops of the glaciers. More weight might make it harder for friction to hold the glaciers back.
Whatever..., it seems that acceleration in the movement of glaciers in Greenland and Antarctica opens up the possibility for undesirable changes in the rate of sea level rise.