Graph of the Day: Emissions take toll on Arctic ice

The Daily Climate

Satellite-sea-ice-21July-768

A generation ago Jimmy Carter was in the White House, donning sweaters and telling Americans to turn down the thermostat. In the 35 years since, global emissions have almost doubled, from 18 billion metric tons of carbon dioxide a year in 1980 to almost 32 billion in 2011, the latest year available.

Arctic ice extent-600The impacts are increasingly being felt everywhere – bigger storms in the Midwest, soggy summers in England, drought in Colorado. But nowhere on the planet are the impacts as dramatic as the Arctic, and the ice cap is a prime example.

If you’re sweltering in New York or Miami or Los Angeles, the only ice you’re probably thinking about is the stuff melting fast in your drink.

But up in the Arctic, the ice pack is on pace for another record low. Scientists won’t know for sure until mid-September, the end of the North’s melt season. But two snapshots, one from July 21, 1979, the other from July 21, 2014, show the change.

Source: The Daily Climate. Reproduced with permission. 

Comments

9 responses to “Graph of the Day: Emissions take toll on Arctic ice”

  1. Pied Avatar
    Pied

    Why not also mention that the Antarctic ice sheet is growing? It is far more important to the earths temperature and weather, probably doesn’t make a good story

    1. Sqawkin Avatar
      Sqawkin

      You may be interested in the destabilisation of the Western Antarctic ice shelf which is of concern.
      New Antarctic ice is caused by change in flow patterns and is more superficial than what is breaking off in the west.

    2. MorinMoss Avatar
      MorinMoss

      “probably doesn’t make a good story” – especially when it’s told inaccurately. The Antarctic ice sheet behaves differently, mostly because it’s land-based, surrounded by ocean as opposed to the Arctic, sea-based, mostly landlocked.

    3. WR Avatar
      WR

      The growth in the Antarctic autumn and winter ice is basically a result of global warming and the hole in the ozone layer. These changes are producing extra fresh water at the ocean’s surface which is then freezing during the autumn and winter to form the extra sea-ice.

      The combination of global warming and the ozone hole has caused the westerly winds that circle Antarctica to intensify and move to a more southerly latitude. This change in wind patterns is pushing a warm, largely circumpolar ocean current further south towards Antarctica.

      The warmer water of the current is producing extra fresh water at the sea surface around Antarctica by two methods: 1) By melting more coastal land-ice during the summer, and 2) by producing more precipitation. (The warm water produces more precipitation because more water evaporates from warm water than cold water. This increases the relative humidity in the region, which leads to more cloud formation and precipitation.) The extra fresh water remains at the ocean’s surface in spite of being cooler than the underlying warm water because of its low salinity.

      Fresh water freezes more easily than salt water, which is why the extra surface fresh water is key to the slightly increasing volume of sea ice extent seen forming during the autumn and winter.

      While there is extra sea ice forming in autumn and winter, the mass of the land-ice is decreasing year-on-year. This is because both the air temperature over Antarctica and, more importantly, the ocean temperatures in most of the waters surrounding Antarctica has been increasing over the past 40-50 years. The temperature of the southern ocean has increased by more than any other of the world’s oceans during that period.

      By the way, why would the Antarctic be more important to the earth’s temperature and weather than the Arctic? Most of Earth’s people and land masses are in the northern hemisphere. They are much more affected by the changes occurring in the Arctic than by anything occurring at the south pole.

    4. drewphillips Avatar
      drewphillips

      The Antarctic ice sheet IS NOT growing — the sea ice is — according to GRACE satellites. And there is no hard evidence that the Antarctic sea ice has gained more ice, only that it has been spread more widely.

    5. Colin Nicholson Avatar
      Colin Nicholson

      Down in the fiction department, It must be a good story since it is churned out over and over. But why read the the fiction when you can read the facts on the NASA website?

  2. Hugh Sharman Avatar
    Hugh Sharman

    Doesn’t look as if 2014 will be anywhere near the 2012 “record” low. Where is 2013 please? BTW, I agree with Pied!

    1. MorinMoss Avatar
      MorinMoss

      Admitting you’re as uninformed as Pied? You might want to rethink that.

  3. ac baird Avatar
    ac baird

    As the Titanic sank, onlookers in lifeboats (so “sold” on the idea the ship was unsinkable) saw the ship appear to be rising back out of the water, unaware that below the surface the ship had snapped in half, and the remaining section, free of the mass of the sunken part, bobbed up somewhat. The denialists are doing the same, highlighting factoids that appear to disprove reality, convinced that the odd “counter-phenomenon” equals cooling. It’s sheer irony that Clive wants to bring the Titanic back to life.

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