Ice sheets and glaciers cover approximately 15 million km2, roughly equivalent to 10% of the Earth's land surface area.  Roughly 80% of the sunlight that hits the ice reflects into space. Pupils could return at intervals to measure the amount of sea level rise as the ice … Sea ice forms in the winter months and melts in the summer months, however in certain regions it remains year round. Available: ”Polar Ice Fact Sheet : Feature Articles", NASA, 2016.  Greenland and Antarctica combined, contain about 75% of the world's fresh water, which is enough to raise sea level by over 75 meters, if all the ice were restored to the oceans.. In the other tub, place the same number of ice cubes on the bottom of the tub, next to the clay. Sea Ice refers to frozen ocean water which is seen in remote polar oceans. Two identical, clear, plastic food-storage containers, approx. Therefore, when it melted off of the “land” and dripped into the water, it added volume. The Greenland Ice Sheet has a sea level equivalent ice volume of 7.36 m, and covers 1.2% of the global land surface. This article is aimed to distinguish between these two types of ice. , Sea ice forms in the winter months and melts in the summer months, however in certain regions it remains year round. At regular intervals, measure the water level and record it on the data sheet.  While still large, land ice only covers two thirds as much surface area as sea ice covers. In the first part of the experiment, the water level (sea level) did not go up. It forms, grows, and melts in the ocean. Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. ‘’Arctic Ocean Sea Ice’’ [Online]. As these ice sheets and glaciers melt, the water eventually runs into the ocean, causing sea level to rise. In the Southern … NASA Climate Change social media – Follow the latest news and updates from NASA Climate Change on. Be sure the clay surface will allow the melted land ice to flow into the body of water. The freshwater ice (on the left) is solid all the way through and has no channels. They conduct two experiments, one looking at sea ice and the other looking at land ice and observe how the melting of this ice affects the sea level. Ask them to specify if the ice is on land or at sea. (May 8, 2016). BTW…whether an ice free Arctic ocean happens in 2020 or 2030 or 2040, makes little difference. Like sea ice, land ice plays a significant role in maintaining Earth's energy balance by reflecting solar radiation back out into space. Glaciers and ice sheets also store about 75% of the world's fresh water (NSIDC, 2013), which makes them vital for human survival.  Land ice differs from sea ice in the way that it is formed. How does this compare to your prediction? Sea ice is white which means it has a highly reflective surface, thus it has a high albedo. Place both 2L beakers outside or under a lamp. Does the melting of Earth’s glaciers contribute to sea-level rise? The effect is too small to see in my experiment (less than 1 mm of water level change), and not directly applicable to melting sea ice in the ocean. A simple science fair project to investigate the effect of sea ice (ice in the ocean) versus terrestrial ice (ice on land). Land ice changes are slower but do affect sea levels, at least until the land ice becomes afloat. Floes are more prone to converge, or bump into each other, and pile up into thick ridges. Antarctic sea ice extent is currently below the long-term average of all decades prior since 1979. Another way to mark the water level is to mark a line in the clay using a pencil or other object. [Online]. These converging floes makes Arctic ice thicker. Compare sea level rise of melted sea ice vs land ice. You can mark the water level with a marker on the outside of the tub, but if the containers are reused, they will have the marks from the previous group. Without disturbing the ice cubes, pour water into the land-ice container until the water level is about equal to the water level in the sea-ice container. The materials list above is for one group or one whole-class demonstration. Press equal amounts of clay into one side of each plastic tub, making a smooth, flat surface representing land rising out of the ocean. Irina V. Gorodetskaya*1,2Mark … What do you think will happen to the water when sea ice melts into it, versus when land ice melts into it? This sea ice often breaks into ice floes when a solid sheet of ice shifts and thaws in the spring. Pour water into the sea-ice container until the ice floats. How about the melting of icebergs? With land ice, the ice wasn't displacing any water. This represents sea ice. Pour cold water into the sea-ice container until the ice floats. Roughly 80% of the sunlight that hits the ice reflects into space. As the sea ice melts in the summer, and instead of reflecting, the ocean absorbs 90% of the sunlight.  This is an example of a positive climate feedback, which is part of why climate change effects are hard to predict. Lake ice is also considered land ice. https://www.jpl.nasa.gov/edu/teach/activity/whats-causing-sea-level-rise-land-ice-vs-sea-ice/.  These variations in ocean temperature and salinity can disrupt and threaten marine species that are dependent on the ocean due to the ocean being delicate to change. This turns the inside of the ice the same color as the dye. Although sea ice moves around the Arctic basin, it tends to stay in the cold Arctic waters. Be sure no ice … It is formed when freshwater, which has low density, stays on the earth’s surface and forms a layer of ice.  Ice shelves act as a reinforcement, preventing glacial ice from reaching the ocean. Formulate your hypothesis, then click "play" to find out! To understand why this is, imagine a jug of ice and water. This represents land ice. Sea level rise is a natural consequence of the warming of our planet. Compare the water level with the marked line in the clay. For example, if the entire West Antarctic ice sheet melted, the sea level would increase by 5 meters. Ice on land such as Antarctica and Greenland would affect sea level just as the friction of the ice leaning on the jar showed a wrong conclusion. Students should make a prediction and provide reasoning for their prediction. Generate measurement data by measuring lengths using rulers marked with halves and fourths of an inch. Students should be able to connect the model to the global events of ice melting and associated sea-level rise. In Part 2 of our Sea Level Rise experiment, Ayla walks you through how to determine whether land ice (like glaciers) or sea ice (like icebergs) contributes more to rising water levels. Sea ice occurs in both the Arctic and Antarctic. Although sea ice moves around the Arctic basin, it tends to stay in the cold Arctic waters. The water shouldn’t be higher than the land level. If students meet for only a class period, consider accelerating the ice melt by placing the experiment near a warm lamp or a source of mild warmth. to the water around the 150 mL beaker. Groups should build the land-ice and sea-ice containers according to the directions. Allow the ice in both tubs to melt completely. On the student data sheet, have students record their prediction about which type of ice will contribute more to sea-level rise. In the Northern Hemisphere, it can currently exist as far south as Bohai Bay, China (approximately 38 degrees north latitude), which is actually about 700 kilometers (435 miles) closer to the Equator than it is to the North Pole. Both thermal expansion and ice melt are the results of the rise in global average temperatures on land and sea known as climate change. Roughly 15% of the world's oceans are covered by sea ice during a portion of the year.. [Online]. It is formed slowly, a process that involves the saline water sinking from the surface which then cools and solidifies. This represents land ice. (The Greenland and Antarctic ice sheets, along with smaller mountain glaciers, are considered land ice. Show the measurements by making a line plot, where the horizontal scale is marked off in whole-number units. Glaciers – large sheets of ice and snow – exist on land all year long. Which can become sea ice when chunks of ice that break off and fall into the ocean (and become icebergs). 6 inches by 6 inches, Clay (enough to fill about a quarter of each tub with 1-2 inches of clay). Obtain information to identify where water is found on Earth and that it can be solid or liquid, Obtain and combine information to describe climates in different regions of the world, Develop a model using an example to describe ways the geosphere, biosphere, hydrosphere, and/or atmosphere interact, Develop a model to describe the cycling of water through Earth's systems driven by energy from the sun and the force of gravity. Sea and Land Ice Melt Ice is found all around our planet, from the highest peak in Africa to the icy North and South Poles. Leave the tray as the land ice melts. This results in food coloring pooling on top or run down the side of the ice. , The intensity of sea level rise depends on the quantity of melt occurring. Using the ruler, measure the water level (in millimeters) in each tub and record the data on the student data sheet. “ land. ” off Balance and thaws in the other tub, to! 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