Low summer temperature 2013 delayed Arctic Melt

21/07/2015 09h16 - Updated 21/07/2015 09h16
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Ice floating in Arctic waters recovered 41% of its volume in 2013 when temperatures in summer (North hemisphere) were 5% lower than in previous years, which delayed some years the retreat of banks, indicated the European Space Agency (THAT) in a statement on Tuesday.

Arctic banks reduced their volume 14% in the summer of 2010 e 2012, but they recovered 41% in the same period 2013 thanks to a colder season, similar to that recorded in the late 90, explained ESA, in reference to a study by University College London and the University of Lede, published in “Nature Geoscience”.

The authors of this work, which used data collected by the satellite CryoSat ESA, concluded that the Arctic ice are more sensitive to summer thaw that the winter cooling.

The Summer 2013 was “unusually cold”, equivalent to the temperatures that were recorded in the late 1990 when global warming was less advanced, He noted lead author of the study and a member of the Observation and Modeling Center Polar (CPOM), Rachel Tilling.

This allowed the northern banks of Greenland overcome this season because there were fewer days of thaw, that is, what “it is possible to recover a considerable percentage to thaw season is shorter than usual”, Tilling needed.

The satellite Cyrosat, put into orbit for 5 years, It allows to quantify and predict the effects of climate change on the ice reserves on the planet as it analyzes the banks of the polar oceans and the ice sheets of Antarctica and Greenland.

In this way, you can analyze the volume changes that occur the effect of global warming and that made since the late 70 its reduction has been constant.

The importance of this satellite is also in their ability to know what happens under water, “which is where it develops most of the action”, these tilling.

Before CryoSat -ressaltou ESA- It was complicated observe this phenomenon due to the continuous movement of the ice made it difficult to take action in the region.

However, with this satellite it is possible to obtain ice extent maps and measures of its thickness to provide a complete radiography.

With this technology, team ensures this investigation be closer to be able to predict the behavior and duration of Arctic banks, that are “a key component of Earth's climate system”, according to the director of CPOM, Andrew Shepherd.

Shepherd warned that, despite the significant increase in banks during the summer 2013, the thaw will follow producing “increasing the temperatures follow”.

Therefore, the authors of this study emphasize the need to control banks, even when the satellite mission end, to be able to predict the effects of climate change and facilitate maritime activities in the Arctic.

Source: Exame.com

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