NASA Software Shows How Sea Level Rises Affect Cities

NASA scientists have created a new software program that can show how cities in coastal regions are endangered by flooding and sea level rise caused by global warming. The simulation shows how 300 coastal cities will be affected in the next century.

The software was developed by  NASA’s Jet Propulsion Laboratory. It calculates which ice sheets and glaciers are melting and how the additional water influences coastal regions. It takes into consideration the rotation of the Earth as well as the influence of gravity. The results are surprising. Sea levels will actually decrease around cities closer to ice masses, while the biggest rises will occur through ice caps that are farther away.

New York, for example,  will be most affected by melting ice caps in northeastern  Greenland. Sydney, on the other hand,  will actually be influenced by parts of Antarctica that are far away from Australia’s city.

The software aims at helping city planners prepare for sea level changes within the next few decades and how to keep ocean water out.

A climate report published this week shows that, since 1900, global sea levels have risen by about 20 cm, with half of the rise occurring in the last 25 years. Projections show that by 2100 ocean levels will rise by an average of 1 metre, however, the rise will not affect all coastal areas in the same way.

 

Ice Sheet in Greenland -
Ice Sheet in Greenland – Image: Christine Zenino

Words

  • actually = in fact
  • additional = extra
  • affect = change
  • aim = here: what it wants to do and who it wants to help
  • average = here: evenly spread out across all oceans
  • calculate = here: find out how much something will change by using numbers
  • century = a hundred years
  • coastal = where land meets the sea
  • decade = ten  years
  • decrease = go down
  • develop = create , make
  • endangered = to be in danger
  • flooding = when land becomes covered with water
  • glacier = very large mass of ice which moves down a valley
  • global = worldwide
  • global warming =  the increase in the world’s temperatures by higher amounts of carbon dioxide in the atmosphere
  • gravity = force or power that causes something to fall to the ground and stay there
  • ice cap = large mass of ice
  • influence = change
  • NASA = National Aeronautics and Space Administration = American space agency
  • occur = happen
  • prepare = get ready for something
  • projection = calculation about what something will be in the future  based on the information we have now
  • publish = to make information for everyone to see
  • rise = to go up
  • rotation = the Earth’s spin  around its own axis
  • sea level = the average height of the sea
  • scientist = a person who is trained in science and works in a lab
  • simulation = here: software that shows how something could happen in the future
  • take into consideration =  here: to use  certain factors when you run the programme

Massive Hole Discovered in Antarctic Ice

Scientists have discovered a gigantic hole that has reappeared in the Antarctic ice. It is about the size of the Netherlands and is located around the Weddell Sea.

In the 1970s climatologists found a similar hole at almost the same spot. At that time  they didn’t have the observation equipment that they have now, so they couldn’t study the hole closely enough. After a few years it disappeared . Last year, the hole came up again.

Researchers cannot explain how the hole emerged.  One theory is  that warmer salt water from deep under the Antarctic ice sheet  may have come up and mixed with cold water near the surface, thus , melting the ice sheet above.  Normally a thick layer of ice covers Antarctica at the end of the  southern winter. Scientists also claim that it may be connected to climate change and global warming.

Such a hole in the ice is called a polynya.  Although not totally uncommon, it is strange that the hole in the Antarctic ice has appeared very far from its edge . Usually such holes are found in coastal regions.

Climatologists are not sure whether the hole will have an impact on the water temperature in the world’s oceans. If warmer water continues to surface to the top of the hole it may stay there for a longer period of time because it would then be difficult for ice layers to form.

Severe weather conditions during the Antarctic winter make it difficult to find holes in the ice . This is the second time in two years that such a hole has emerged , although last year’s was not that big.

 

Antarctic Ice Shelf
Antarctic Ice Shelf

Words

  • although = while
  • claim = to say that something is true even if you cannot prove it
  • climatologist = person who studies the weather and how it changes the climate on earth
  • coastal = where land meets the sea
  • disappear = go away
  • discover = to find something that has not been there before
  • edge = the part of an object that is furthest from the centre
  • emerge = come out  from somewhere
  • equipment = the tools or machines you need to do something
  • gigantic = huge; very big
  • global warming = the increase in the temperature of the atmosphere
  • ice sheet = area of thick ice that covers the North and South Poles
  • impact = influence, change
  • layer = material or substance between two other things
  • reappear = to come again, after it has gone away for some time
  • researcher = a person who studies a subject in order to find out more about it
  • scientist = a person who is trained in science and works in a lab
  • severe = bad, extreme
  • similar = almost the same
  • size = how big something is
  • surface = the top layer of something
  • thus = therefore; that is why
  • uncommon = unusual, strange