NASA continuously measures the weight of glaciers and ice sheets – with the twin GRACE satellites from 2002 to 2017, and with the GRACE-Follow On satellites since 2018. But it makes a difference whether that melting ice is on land or in the sea. But there is a second order effect: Yes, to second order, a small effect exists. Melting Ice and Sea Levels. The same thing happens to ice in nature — if the temperature gets warm enough, the ice melts. border:3px solid LightGrey; That’s 2.96 million cubic kilometers of ice now covering land areas—and it’s melting into the ocean. Will an ant breathing change the amount of CO2? As it warms, the ice in the glass melts, but the total volume of water does not change. You might have heard that melting ice contributes to sea level rise. The volume of water they displace as ice is the same as the volume of water they add to the ocean when they melt. Any careful scientist will answer yes to all three questions, even if he is completely convinced that the alarmist theory is nonsense (as it indeed is). ), Buried in the text you will find some remarkable numbers. Consider where on Earth ice naturally occurs. But all that melting ice … Is relativity consistent with elephants flying around the room? { Then build a model to compare what you predicted to … table.topics-guide Are humans changing the amount of CO2? Adrian Jenkins and David Holland. Try to answer these questions: About the image: The graph above shows global sea level rise as measured by Earth satellites from 1993 through 2020. Greenland’s melting ice sheet could generate more sea level rise than previously thought if greenhouse gas emissions continue to increase and warm the atmosphere at their current rate, according to a new modeling study. 69,000 km3 of melted ice (assuming all fresh water) has mass of 69,000 * 109 kg, which, as ice, displaces its own weight in sea water, which is 0.9737m^3 * 69000 * 109 m3 of sea water, which equals  67,185 * 109 m3. This doesn’t cause the sea level to rise, however, because the volume of this floating ice has already been accounted for. The first order effect of melting sea ice on sea levels is zero. The melting of this ice will not inflence sea levels. If you don’t have clay, try using some rocks to create a “land” surface on which you can place several ice cubes. This is because of a number of reasons. border-collapse:collapse; When sea ice melts, it exposes the darker sea surface, which absorbs solar energy (heat). This represents sea ice. The idea is that when the ice melts, it will exactly fill in the 'space' that the ice block made in the water, thus leaving the water level unchanged. So here, with sea levels, we have yet another case of this. But all that melting ice and snow does not directly boost sea levels any more than melted ice cubes make a glass of water overflow, which gives rise to an awkward question: who cares? See below for materials and step-by-step instructions. Yes. What's the difference? So sea level rise for 5% melting of the West Antarctica ice sheet would be more like 0.4 meter rather than the paper's 4 meters. Yes. If this ice were land ice, it would raise sea levels by 69,000 / 361,000,000, which equals about 19cm. The density of sea water at the sea surface is 1027kg/m3. The illustrated directions for students are exceptionally well done and each step is accompanied by excellent images to guide students. If you ask a scientist for his opinion, as a scientist, on whether any thing X can, or could, or might, influence some other thing Y, he will almost certainly say yes, regardless of what X and Y are. This article was inspired by a post on Wattsupwiththat about melting sea ice. I bookmarked this question to answer later when I had time, when there were still no answers, but I’ll still answer it now anyway, even though there are 7 other answers already. "Sea ice" is frozen sea water, frozen and melting yearly during the summer / winter heating and cooling cycle. When an ice shelf disintegrates, the glacier feeding it often accelerates. This represents land ice. And when ice on land melts and water runs into the ocean, sea level rises. It's so unlikely we can be sure it won't happen, but yes, it is possible. I don't know about you, but 47 millimetres doesn't exactly strike terror into my heart or freeze the marrow with fear of puppy dogs drowning as the oceans break their banks. 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