Category Archives: The Science

PLEA Network

22 June 2015, The Conversation, Climate: the elephant in the room for developing northern Australia: The recently released white paper on developing northern Australia ignores an elephant in the room: climate change. While the paper sees a bright future for the north (roads, rail, dams and food), without considering climate change we can’t be sure the north will even be liveable. The white paper also fails to take into account other environmental constraints such as water and soils….. The white paper has not referenced high-quality expert advice prepared by the Northern Australian Land and Water Task Force…. The white paper ignores reference to sophisticated climate change projections for northern Australia developed by our own CSIRO and Bureau of Meteorology. Climate projections for the north this century paint a dire future and bring into question the feasibility and affordability of many of the development policies, plans and projects outlined in the white paper. Read More here

 

PLEA Network

19 June 2015, Carbon Brief, The Atlantic ‘conveyor belt’ and climate: 10 years of the RAPID project: A global project that’s been instrumental in shaping scientists’ understanding of how the oceans affect our climate celebrated its tenth birthday recently. A new paper published in Science looks back at 10 years of the RAPID project, which has been keeping tabs on how heat moves around in the Atlantic Ocean since 2004. Over its short lifetime, the project has thrown up a few surprises. Parts of the Atlantic circulation seem to have slowed down, though whether that’s down to human activity remains to be seen. Carbon Brief talks to one of RAPID’s founding scientists, Prof Harry Bryden from the National Oceanography Centre in Southampton, about the project. Read More here

Global heat transport

Above about 1,000 metres in the North Atlantic, warm water flows northwards from the equator towards the poles, releasing heat as it goes. The water cools and sinks at high latitudes, returning southwards towards the equator at much deeper depths.

This is known as the Atlantic Meridional Overturning Circulation (AMOC) and forms part of aglobal ocean conveyor belt that transports heat all around the world.

                 Screenshot 2015-06-19 18.22.21

The Atlantic Meridional Overturning Circulation (AMOC). Warm water flows north in the upper ocean (red arrows) then sinks and returns south as deep cold water (blue arrows) Source: Srokosz & Bryden ( 2015) Supplementary material

PLEA Network

15 June 2015, Skeptical Science, The latest global temperature data are breaking records: Just today, NASA released its global temperature data for the month of May 2015. It was a scorching 0.71°C (1.3°F) above the long-term average. It is also the hottest first five months of any year ever recorded. As we look at climate patterns over the next year or so, it is likely that this year will set a new all-time record. In fact, as of now, 2015 is a whopping 0.1°C (0.17°F) hotter than last year, which itself was the hottest year on record.

Below, NASA’s annual temperatures are shown. Each year’s results are shown as black dots. Some years are warmer, some are cooler and we never want to put too much emphasis on any single year’s temperature. I have added a star to show where 2015 is so far this year, simply off the chart. The last 12 months are at record levels as well. So far June has been very hot as well, likely to end up warmer than May. Read More here

PLEA Network

4 June 2015, Climate Action Tracker, Bonn: The combined climate plans for the G7 and EU have made a small step towards the right track to hold warming to 2?C, but there is still a substantial emissions gap, the Climate Action Tracker said today. Ahead of the upcoming G7 meeting in Germany, the Climate Action Tracker – an analysis carried out by four research organisations – has looked at the combined INDCs of all G7 governments and the EU, who are responsible, in aggregate, for around 30% of global greenhouse gas emissions and 40% of global GDP.

  • Current policies in the G7+EU are projected to stabilise emissions through to 2030 at close to present levels, and do not yet show a decline in emissions, which is needed to move towards below 2°C and 1.5°C emission pathways. 
  • The projected combined effect of G7+EU INDCs for 2025, and 2030, if implemented, would bring the group 20-30% of the way to 2°C-consistent emissions in this period.
  • The G7+EU 2020 pledges only bring emissions 5% of the way towards emissions levels consistent with 2 and 1.5°C in that year.
  • While the remaining gaps still represent important mitigation challenges (roughly 6.5, 7.6 and 7.8 GtCO2e/year in 2020, 2025 and 2030 respectively or 21%, 24% and 25% of 1990 emissions levels excl. forestry), there is a clear, but as yet insufficient, improvement in ambition. Read More here