Июл 31 2013

The changes in the Aral Sea region

Автор: | 1:26 | В рубриках Новости

Humans are causing massive changes in the location of water around the world

cheap moncler jackets sale (Mark Ralston/AFP/Getty Images) cheap moncler jackets sale

A cheap moncler 14 year NASA mission has confirmed that a massive redistribution of freshwater is occurring across Earth Moncler Outlet , with middle latitude belts drying and the tropics moncler outlet store andhigher latitudes gaining water supplies.

cheap moncler The results, which are probably a combination of the effects of climate change, vast human withdrawals of groundwater and simple natural changes, could have profound consequences if they continue, pointing to a situation in which some highly populous regions could struggle to find enough water in the future. cheap moncler

moncler outlet The results emerge from the 2002 2016 GRACE mission, which is short for Gravity Recovery and Climate Experiment, supplemented with additional data sources. The GRACE mission, which recently ended but will soon be replaced by a «Follow On» endeavor, consisted of twin satellites in orbit that detected the tug of cheap moncler outlet Earth’s gravity below them and monitored mass changes cheap moncler jackets based on slight differences in measurements by the two satellites. moncler outlet

moncler sale The new research, led by NASA’s Matthew Rodell, pulls together these and other findings to identify34 global regions that gained or lost more than 32 billion tons of water between 2002 and 2016. As the study moncler outlet notes, 32 billion tons is about the amount of water contained in Lake Mead, which is in Nevada and Arizona. So all 34 areas saw very large changes. moncler sale

The resulting map of the findings shows an overall pattern, cheap moncler coats in which ice sheets and glaciers lose by far the most moncler outlet online mass at the poles, but at the same time, middle latitudes show multiple areas of growing dryness even as higher latitudes and the tropical belt tend to see increases in water.

moncler outlet online NASA, after Rodell et al., 2018. moncler outlet online

moncler factory outlet The study emphasizes that the 34 separate changes that it detects do not all have the same cause not even close. moncler factory outlet

There’s strong suspicionthat the melting of glaciers and ice sheets is tied to climate change. On land, it’s possible that some droughts and rainfall increases might also be, though the study is cautious about moncler sale that, noting that natural variability can also be a major factor.

moncler jacket sale Still, the idea of mid latitude drying and higher and lower latitude wetting is a common feature of climate change models. «We only have 15 years of data from GRACE, but it sure as heck matches that pattern, it matches it now,» Famiglietti said. «That’s cause for concern.» moncler jacket sale

Further data from a new launch of the GRACE «Follow On» mission will contribute to a longer data record that may help better identify trends, Famiglietti said.

moncler sale outlet And there are other human monlcer down jackets induced changes, relating not to climate moncler outlet sale change but, rather, to direct withdrawals of water from the landscape. moncler sale outlet

cheap moncler jackets In northern India, moncler sale outlet the northern China plain and the Caspian and Aral seas in Central Asia,among other regions, human withdrawals for agriculture have subtracted enormous amounts of water from Earth. The changes in the Aral Sea region, previously documented by NASA, have been particularly intense. cheap moncler jackets

moncler outlet uk The Aral Sea in 2015. The body of water has shrunk in size dramatically in recent years because of water withdrawals from rivers that feed it. (NASA Earth Observatory) moncler outlet uk

cheap moncler outlet There are also major moncler mens jackets cases of humans increasing water storage in the cheap moncler sale landscape, particularly in China, where massive dam construction has created enormous reservoirs. cheap moncler outlet

moncler jackets outlet Mainly, though, what’s striking about the map is the way that a combination of human driven water withdrawals and droughts seem to be punishing the central latitudes of the Northern Hemisphere, in particular, but also the Southern Hemisphere to a significant extent. moncler jackets outlet

moncler outlet sale «I think we have forgotten, society has forgotten, how much water it takes to produce food,» Famiglietti said. «We’ve taken its availability for granted. And you know, now we’re buy moncler jackets at a point in many of these aquifers where we can’t take it for granted anymore. Population is too great, groundwater levels are too low. we’re at tipping points.» moncler outlet sale

cheap moncler coats Still, it’s important to bear in mind that https://www.moncleroutletssale.com , while the GRACE data has given a new panoptic view of the changing distribution of water around the globe, the data remains coarse and the causes behind the trends in many cases remain a matter of interpretation, said Peter Gleick, an expert on climate change and water who is president emeritus the Pacific Institute. cheap moncler coats

moncler outlet jackets «Without a doubt the GRACE system proved that we can see very significant changes in water storage around the planet,» Gleick said. «Figuring out what drives those changes is a harder thing.» moncler outlet jackets

The next GRACE satellite mission will provide better data, he said.

moncler outlet store «We’re in this transition between not really having a global overview and someday having an incredibly high resolution, sophisticated, remote sensing overview,» Gleick said. «That’s where we are.» moncler outlet store.

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