Sea level rising 60 percent faster than estimated!!

Satellite measurements says rise in sea level at a rate of 3.2 mm a year.


Source:  IANS

The world’s sea level is rising 60 percent faster than the central projections of the Intergovernmental Panel on Climate Change (IPCC), says a new study.

Satellite measurements show the sea level is actually rising at a rate of 3.2 mm a year compared to the estimate of two mm a year in the IPCC report.

Results were obtained by taking averages from the five available global land and ocean temperature series, the journal Environmental Research Letters reports.

The study was led by Stefan Rahmstorf, professor of physics of the oceans at the Potsdam Institute for Climate Impact Research, Germany. It included researchers from Tempo Analytics, US, and Laboratoire d’Etudes en Geophysique et Oceanographie Spatiales, France

The researchers believe the findings are important for keeping a track of how well past projections match the accumulating observational data.

“This study shows once again that the IPCC is far from alarmist. But in fact has under-estimated the problem of climate change. That applies not just for sea-level rise, but also to extreme events and the Arctic sea-ice loss,” Rahmstorf said.

The study involved an analysis of global temperatures and sea-level data over the past two decades, comparing them both to projections made in the IPCC’s third and fourth assessment reports, according to a Postdam statement.

After removing the three known phenomena that cause short-term variability in global temperatures — solar variations, volcanic aerosols and El Nino/Southern Oscillation — the researchers found the overall warming trend at the moment is 0.16 degree Celsius per decade, which closely follows the IPCC’s projections.

Satellite measurements of sea levels, however, showed a different picture with current rates of increase being 60 percent faster than the IPCC’s AR4 projections.

Satellites measure sea-level rise by bouncing radar waves back off the sea surface and are much more accurate than tide gauges as they have near-global coverage; tide gauges only sample along the coast.

Tide gauges also include variability that has nothing to do with changes in global sea level, but rather with how the water moves around in the oceans, such as under the influence of wind.


‘Wick lamps account for huge carbon levels’

Kerosene lamps – important source of light for more than a billion people in developing nations like India – churn out black carbon at high levels, a new study has found.

Researchers at UC Berkeley and the University of Illinois, found that 7 to 9 per cent of the kerosene in wick lamps – used for light in 250-300 million households without

electricity – is converted to black carbon when burned, at levels previously overlooked in greenhouse gas estimates.

In comparison, only half of 1 per cent of the emissions from burning wood is converted to black carbon. Wick lamps account for huge carbon levelsWick lamps account for huge carbon levels

Researchers found that there is a twenty-fold increase in estimates of black carbon emissions from kerosene-fuelled lighting.

English: Kerosene lamp Italiano: Lampada a pet...

English: Kerosene lamp Italiano: Lampada a petrolio (Photo credit: Wikipedia)

Previous estimates come from established databases used by the Inter-governmental Panel on Climate Change and others.

One kilogramme of black carbon, a by-product of incomplete combustion and an important greenhouse gas, produces as much warming in a month as 700 kilogrammes of carbon dioxide does over 100 years, researchers said.

“The orange glow in flames comes from black carbon, so the brighter the glow, the more black carbon is being made,” said study principal investigator Tami Bond.

“If it’s not burned away, it goes into the atmosphere,” Bond said in a statement.

The findings, published in the journal Environmental Science & Technology, are coming out at the same time that the United Nations Climate Change Conference kicks off in Doha, Qatar.

While officials from around the world are seeking effective policies and guidelines for cutting greenhouse gas emissions, the researchers note that the simple act of replacing kerosene lamps could pack a wallop toward that effort.

“There are many inexpensive, cleaner alternatives to kerosene lamps that are available now, and few if any barriers to switching to them,” said Smith.

A recent epidemiological study in Nepal led by Smith and other researchers found that women who reported use of kerosene lamps in the home had 9.4 times the rate of tuberculosis compared with those who did not use such lamps.