{"id":1112,"date":"2020-01-13T20:14:03","date_gmt":"2020-01-13T20:14:03","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=1112"},"modified":"2020-01-13T20:14:16","modified_gmt":"2020-01-13T20:14:16","slug":"studying-asian-glaciers-provides-glimpse-into-future-of-extremes","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/1112\/studying-asian-glaciers-provides-glimpse-into-future-of-extremes\/","title":{"rendered":"Studying Asian glaciers provides glimpse into future of extremes"},"content":{"rendered":"
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Scientists may have solved a 25-year-old puzzle about the mysterious behaviour of certain glaciers in High Mountain Asia. In most of this region, they are shrinking; but in the northwest, they are growing.<\/strong><\/h3>\n<\/div>\n<\/div>\n<\/div>\n
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High Mountain Asia includes ranges that span the borders of Afghanistan, Bhutan, Nepal, India, China and Pakistan. The rate of glacier melting has doubled here in the last 20 years \u2013 except for glaciers in the Karakoram and Kunlun ranges where, since the 1990s, they have been stable or have even been growing.<\/p>\n

Some scientists have attributed the oddity to a cold vortex of wind that sits over these glaciers, but Professor Walter Immerzeel, a mountain hydrologist at Utrecht University in the Netherlands, wondered if it might have to do with farming in the plains below. It was once desert, but farmers have transformed this region, known as the Tarim Basin, into green farmland by tapping into groundwater for irrigation.<\/p>\n

As part of a project called\u00a0CAT<\/a>, Prof. Immerzeel\u2019s team built a model of the local climate which has demonstrated that this ground water, absorbed by crops, then evaporates from their leaves to create moisture-laden air which, as it rises, blocks some of the sun\u2019s radiation and then falls as snow onto the glaciers.<\/p>\n

While the topic is still one of hot debate, Prof. Immerzeel\u2019s work illustrates the growing understanding about how High Mountain Asia works hydrologically, and how it is responding to climate change.<\/p>\n

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\"The
The High Mountain Asia stores more snow and ice than anywhere else in the world, except for the poles. Image credit – Horizon<\/figcaption><\/figure>\n

The High Mountain Asia stores more snow and ice than anywhere else in the world, except for the poles. Image credit – Horizon<\/p>\n<\/div>\n

Third biggest<\/strong><\/p>\n

It\u2019s a vastly important region to understand, says Professor Francesca Pellicciotti, a glaciologist at the Swiss Federal Institute for Forest, Snow and Landscape Research. It sustains the third biggest mass of ice in the world, after the North and South Poles. Unlike them, however, it is surrounded by dense population, its meltwaters serving, at least in part, the freshwater needs of\u00a0800 million people<\/a>. Glaciers buffer the water, storing it as ice during seasons of high precipitation, and releasing it downstream in the dry season.<\/p>\n

There has been an explosion of research in the last decade because of scientists\u2019 great ignorance of the region, says Prof. Immerzeel.<\/p>\n

As a result, another mystery may have been solved.<\/p>\n

Around a third of glaciers in the region are blanketed in rocks and stones up to a metre and half thick, says Prof. Immerzeel. This debris shields the ice below from the fierce sun, delaying melting and thus further buffering the system. It was thought that these glaciers would also be better protected against global warming.<\/p>\n

It was a shock, therefore, in 2012, when\u00a0a team found from satellite data<\/a>\u00a0that these debris-covered glaciers were thinning at the same rate as clean glaciers.<\/p>\n

\u2018This was a very controversial paper,\u2019 said Prof. Pellicciotti.<\/p>\n

Since the claim was based on fairly coarse satellite imagery it was essential to investigate on the ground. This is rough work in inaccessible places at high altitudes, clambering over scattered rock. \u2018It\u2019s almost impossible to walk on them and if you want to reach the ice you first have to dig through half a metre of debris,\u2019 said Prof. Immerzeel. \u2018The traditional techniques used in the Alps don\u2019t work here.\u2019<\/p>\n

Their two teams have nevertheless carried kit ranging from rubber dinghies to drilling equipment up 5,000 metres to Langtang glacier in Nepal to gather data. Prof. Immerzeel has also used drones to create detailed topographical maps.<\/p>\n

The maps and ground investigations have revealed something satellites couldn\u2019t: the debris is pock-marked with ponds, and cliffs of ice, that can transfer the sun\u2019s radiation deep inside.<\/p>\n

\u2018Fundamentally they (can) melt up to 30 times more than other areas (of the glacier). We call them hotspots for melting,\u2019 said Prof. Pellicciotti.<\/p>\n

How the ponds form, and how significant they are at scale, is still unknown, and scientists need to know whether they exist across the vast swathe of High Mountain Asia, and not just in Langtang. So, in a project called\u00a0RAVEN<\/a>, Prof. Pellicciotti is now looking for ponds and ice cliffs at three further sites thousands of kilometres apart.<\/p>\n

Glacier melt<\/strong><\/p>\n

Models may have to change but Prof. Pellicciotti believes that, overall, debris does prolong the glacier melt. But separate work she has done in the Andes, along the western edge of South America, has revealed that, as temperatures rise, such glaciers can reach a tipping point where the debris insulation fails and glaciers suddenly melt.<\/p>\n

\u2018Then they will just go,\u2019 she said, as they are located at lower elevations than clean ice glaciers.<\/p>\n

A headache for High Mountain Asia hydrologists has been their inability to account for all its water. Quantities of snow have unaccountably been disappearing from the system, says Prof. Immerzeel.<\/p>\n

His team installed an advanced instrument on a high mountain glacier, capable of making rapid, repeated recordings of moisture levels and wind speed.<\/p>\n

They discovered that there is a perfect set of extreme conditions \u2013 high dryness, intense solar radiation and hurricane-strength wind \u2013 that encourages ice to bypass the normal process of turning to water. Instead it transforms directly into vapour, a process known as sublimation. And that\u2019s where the missing water was going.<\/p>\n

Further data from the team\u2019s weather stations has led to the discovery that there is far more precipitation in the high mountains than has previously been estimated.<\/p>\n

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\u2018Instead of a glacier there will be a rocky area and if rain falls on a rocky area it is almost immediately in a river so \u2026 it will become a much faster and more extreme system. That is really the challenge for the future.\u2019<\/p>\n

Prof. Walter Immerzeel, Utrecht University, The Netherlands<\/p>\n<\/blockquote>\n<\/div>\n

Downstream<\/strong><\/p>\n

As the teams digest these discoveries, they are developing a clearer picture of the effects downstream.<\/p>\n

The future, believes Prof. Immerzeel, will be a turbulent one. As glaciers recede, the amount of water available will rise until it reaches \u2018peak water\u2019 later this century. After this, some fear that the region will dry. But Prof. Immerzeel thinks that the high precipitation levels in the mountains mean that there will always be water.<\/p>\n

\u2018Despite what has been said \u2013 that all the rivers in Asia will run dry due to climate change \u2013 I don\u2019t think that will be the case \u2013 there will be even more water available.<\/p>\n

\u2018That doesn\u2019t mean there\u2019s no problem, because the biggest challenge is dealing with the extremes. Instead of a glacier there will be a rocky area and if rain falls on a rocky area it is almost immediately a river so \u2026 it will become a much faster and more extreme system. That is really the challenge for the future.\u2019<\/p>\n

Prof Pellicciotti says the biggest problem is the lack of ability to coordinate a response.<\/p>\n

\u2018This is really an explosive situation. A loss of ice and lots of people in the context of poor governance, poverty and already-existing conflicts, migration and contested territory,\u2019 she said, citing for example the dispute between India and Pakistan over the Kashmir region and territorial disputes between Nepal, China and India.<\/p>\n

\u2018It\u2019s really a very, very difficult situation and glaciers are the buffers.\u2019<\/p>\n

The research in this article was funded by the EU’s European Research Council. If you liked this article, please consider sharing it on social media.<\/em><\/p>\n

Originally published by Horizon<\/a><\/i><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Scientists may have solved a 25-year-old puzzle about the mysterious behaviour of certain glaciers in High Mountain Asia. In most of this region, they are shrinking; but in the northwest, they are growing. High Mountain Asia includes ranges that span the borders of Afghanistan, Bhutan, Nepal, India, China and Pakistan. The rate of glacier melting … Read more<\/a><\/p>\n","protected":false},"author":316,"featured_media":1113,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[11],"tags":[4,351],"class_list":["post-1112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-energy-environment","tag-environment","tag-glacier"],"yoast_head":"\nStudying Asian glaciers provides glimpse into future of extremes - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/1112\/studying-asian-glaciers-provides-glimpse-into-future-of-extremes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Studying Asian glaciers provides glimpse into future of extremes\" \/>\n<meta property=\"og:description\" content=\"Scientists may have solved a 25-year-old puzzle about the mysterious behaviour of certain glaciers in High Mountain Asia. 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