climate change

Random Interesting News of the week

June 13, 2014 — 2 Comments

Sometimes I am surfing on the internet and I find something interesting. I like to discuss more the topic but due lack of time I can not. So for now on, I’ll try to write a short post (probably on Fridays) with some interesting environmental random news like these:

Calgary Billboard: “The Sun is the Main Driver of Climate Change. Not You. Not CO2.”

A new billboard in Calgary claims: “The sun is the main driver of climate change. Not you. Not CO2.”  Well I am Ok if someone says that we don’t really know if humans are causing the global warming, but blaming the sun? That is not cool. The best part is the name of the organization: http://friendsofscience.org/

 

 

Climate Fact: Weather and Climate Trends in Brazil

Brazil is the host country of the 2014 FIFA World Cup. As thousands of tourists are arriving and the country is preparing for one of the world’s major sporting events, drought is affecting Brazil’s water availability and electricity generation in the Northeast and Southeast regions. Continue reading

The Climate Wars

May 26, 2014 — 5 Comments

Eric Pooley’s Book.

 

In 2008 the BBC released a documentary called Earth – The Climate Wars. In this 3 part television documentary the Scottish geologist Dr. Iain Stewart covers some aspects of the theory about global warming, the battle between the scientists who believe that climate change is caused by humans and the sceptics scientists, and challenge of predict the effects of global warming. It is a really good documentary. 

In the first episode Dr Iain Stewart traces the history of climate change from its very beginning and examines just how the scientific community managed to get it so very wrong back in the Seventies. Along the way he uncovers some of the great unsung heroes of climate change science, as for example the secret organisation of American government scientists, known as Jason, who wrote the first official report on global warming as far back as 1979. He shows how – by the late 1980s – global warming had already become a serious political issue. It looked as if the world was uniting to take action. But it turned out to be a false dawn. Because in the 1990s global warming would be transformed into one of the biggest scientific controversies of our age.
 Continue reading

The Sound of The Arctic Ice Death Spiral

April 13, 2014 — 2 Comments

Much of the Arctic Ocean is covered by sea ice which varies in extent and thickness seasonally. The Arctic sea ice extent has been shrinking (during the summer) and growing (during the winter) over decades (achieving the maximum in April and the minimum in September). However a sea ice loss has been observed in recent decades. For example the average ice extent for March 2014 was the fifth lowest for the month in the satellite record which supports the idea of sea ice decline.

Monthly March ice extent for 1979 to 2014 shows a decline of 2.6% per decade relative to the 1981 to 2010 average. Credit: National Snow and Ice Data Center

In 2012, Peter Wadhams published a paper talking about how fast sea ice decline is happening:

Arctic sea ice extent had been shrinking at a relatively modest rate of 3-4% per decade (annually averaged) but after 1996 this speeded up to 10% per decade and in summer 2007 there was a massive collapse of ice extent to a new record minimum of only 4.1 million km2. Thickness has been falling at a more rapid rate (43% in the 25 years from the early 1970s to late 1990s) with a specially rapid loss of mass from pressure ridges. The summer 2007 event may have arisen from an interaction between the long-term retreat and more rapid thinning rates.

But what is exactly the Arctic ice death spiral?   Continue reading

Can We Hear The Sound of Our Warming Planet?

April 4, 2014 — 1 Comment

Does it sound weird for you? Great you are not alone. I had the same reaction but guys from University of Minnesota combined music and environmental data.

It is not new that our planer is warming.  Ok, lets stand on the shoulders of giants (I hate when someone uses those quotes and I don’t know where it came from). In 2010 J. Hansen and his fellows scientific friends published an article at Reviews of Geophysics. They used the Goddard Institute for  Space Studies (GISS) (NASA) analysis of global surface temperature change. Yes, there are different groups of scientists doing different analysis of global temperatures. So when you hear someone saying: “scientists said that average global temperature is rising”, it is a specific group using some specific data (not always they work together). However these analysis are not totally independent because they must use much the same information (same satellites,  meteorological stations, etc). Roughly speaking, they complete each other. Continue reading

Could climate change increase the price of airfare tickets (consequently tour costs)?

March 23, 2014 — 4 Comments

It is really funny how the things work on internet nowadays. You start looking for something and you end reading unexpected things. I was writing and reading about what is turbulence and how to avoid it (last two posts) when I found a recent (2013) interesting paper talking about the possible intensification of turbulence activity due climate change.

The paper is quite interesting. They define turbulence in an elegant way:

…turbulence when they encounter vertical airflow that varies on horizontal length scales greater than, but roughly equal to, the size of the plane.

The Australian Transport Safety Bureau (ATSB), suggested that cases of turbulence had risen and incidents doubled over the three-month period between October and December last year, compared to the previous quarter. Also moderate-or-greater upper-level turbulence has been found to increase over the period 1994–2005 in pilot reports in the United States. Continue reading