{"id":20078039,"date":"2021-08-18T12:30:00","date_gmt":"2021-08-18T07:00:00","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?post_type=opinion&#038;p=78039"},"modified":"2024-04-12T15:18:21","modified_gmt":"2024-04-12T15:18:21","slug":"himalayas-arabian-gulf-dust-can-melt-mountains-and-change-seas","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/climate\/himalayas-arabian-gulf-dust-can-melt-mountains-and-change-seas\/","title":{"rendered":"The Himalayas and the Arabian Gulf: How dust can melt mountains and change seas"},"content":{"rendered":"\n<p class=\"has-drop-cap\">Asia\u2019s largest freshwater reserve is disappearing. In the Hindu Kush Himalayan region, which is <a href=\"https:\/\/link.springer.com\/book\/10.1007%2F978-3-319-92288-1\">warming by 0.3-0.7 degrees Celsius<\/a> above the global average, global heating is <a href=\"https:\/\/dialogue.earth\/en\/climate\/glaciers-himalayas-melting\/\">melting the glaciers<\/a> that blanket the planet\u2019s highest peaks. Scientists now know that this catastrophic melt is being exacerbated by dust blowing from the Middle East. Moreover, they warn that as well as affecting Asia\u2019s largest rivers, which are born from Himalayan glaciers and bring life and livelihoods to a quarter of humanity, the effects of glacial melt will extend well beyond the Himalayas, also impacting the Arabian Gulf region in&nbsp;turn.<\/p>\n\n\n\n<p>Winds that sweep across Asia link the Hindu Kush Himalayas and the Gulf in an interconnected system. Globally, around <a href=\"https:\/\/newsroom.ucla.edu\/releases\/dust-in-the-wind-is-making-himalayan-glaciers-melt\">5 billion tonnes<\/a> of desert dust from arid regions is swept into the atmosphere every year. Today, scientists can \u201cunderstand the origins of this dust, where it lands, and how it interacts with local environments\u201d thanks to satellite data and computer models, according to <a href=\"https:\/\/civil.iitm.ac.in\/faculty\/chandansarangi\/\">Chandan Sarangi<\/a>, an earth system scientist at the <a href=\"https:\/\/www.iitm.ac.in\/\">Indian Institute of Technology Madras<\/a>. Dust blows onto the High Mountain Asia (HMA) region from the Arabian Gulf, and as far away as North Africa and the southwest Arabian Peninsula, due to <a href=\"http:\/\/lib.icimod.org\/record\/9417\/files\/icimod-climate_change_in_the_hindu_kush-himalayas.pdf\">regional air currents<\/a> and prevailing westerly winds.<\/p>\n\n\n\n<div class=\"wp-block-cd-article-image aligncenter block--article-image block--article-image--article\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><div class=\"block--article-image__column\"><div class=\"hide-expand block--article-image__image\"><img class=\"lazy\" data-src=\"https:\/\/dialogue.earth\/content\/uploads\/2021\/08\/20210817_Arabian-gulf-Himalaya-winds_Mapboard-1.png\" data-srcset=\"https:\/\/dialogue.earth\/content\/uploads\/2021\/08\/20210817_Arabian-gulf-Himalaya-winds_Mapboard-1-768x631.png 768w, https:\/\/dialogue.earth\/content\/uploads\/2021\/08\/20210817_Arabian-gulf-Himalaya-winds_Mapboard-1-1024x842.png 1024w, https:\/\/dialogue.earth\/content\/uploads\/2021\/08\/20210817_Arabian-gulf-Himalaya-winds_Mapboard-1.png 8335w\" data-sizes=\"(max-width: 600px) 768px, (max-width: 1024px) 1024px, 8335px\" alt=\"map Arabian gulf Himalaya wind currents\"\/><\/div><div class=\"block--article-image__content\"><div itemprop=\"caption\" class=\"block--article-image__caption\">Winds that sweep across Asia link the Hindu Kush Himalayas and the Gulf in an interconnected system \u2022 Graphic: The Third Pole<\/div><\/div><\/div><meta itemprop=\"contentUrl\" content=\"https:\/\/dialogue.earth\/content\/uploads\/2021\/08\/20210817_Arabian-gulf-Himalaya-winds_Mapboard-1.png\"\/><meta itemprop=\"contentSize\" content=\"4 MB\"\/><meta itemprop=\"height\" content=\"6851\"\/><meta itemprop=\"width\" content=\"8335\"\/><meta itemprop=\"author\"\/><meta itemprop=\"representativeOfPage\" content=\"true\"\/><\/div>\n\n\n\n<p>These dust particles, Sarangi says, travel long distances at an altitude of 2-5 kilometres and reach the HMA during summer. Dust from arid regions such as the Thar desert in Pakistan and Saudi Arabia \u201cgets lofted above the boundary layer [the lowest part of the planet\u2019s atmosphere] of Earth by convection and gets transported to far places with wind at altitudes and deposited mainly above 3km\u201d. The dust particles are thus deposited in the high Himalayan mountains, blanketing glaciers in a layer of particles that are darker than snow.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-dust-in-the-himalayas-drives-glacial-melt\">How dust in the Himalayas drives glacial melt<\/h2>\n\n\n\n<p>Particulate matter, black carbon and dust present a problem for Himalayan glaciers because of their low albedo.<\/p>\n\n\n\n<div class=\"wp-block-cd-accordion block--accordion\"><span class=\"block--accordion__title\">Albedo explained<\/span><div class=\"block--accordion__content\"><div class=\"block--accordion__content__inner\">\n<p><\/p>\n<\/div><\/div><\/div>\n\n\n\n<p>Clean glacial snow has a high albedo, which means that it absorbs very little sunlight and reflects most of the incoming rays back into space. Darker dust and soot, however, absorb much more of the incoming solar radiation, which warms and therefore melts the glaciers below. In many areas, aerosols like dust and soot significantly exacerbate the impact that atmospheric greenhouse gases have on glacial melt, producing quicker and more direct warming effects.<\/p>\n\n\n\n<p><a href=\"https:\/\/dialogue.earth\/en\/climate\/guwahatis-black-carbon-accelerates-glacier-melt\/\">Black carbon<\/a> from vehicle exhausts, waste burning and the combustion of <a href=\"https:\/\/dialogue.earth\/en\/regional-cooperation\/cross-border-cooperation-needed-to-reduce-himalayan-glacier-loss\/\">biofuels<\/a> in South Asia\u2019s big cities was previously thought to be the primary aerosol driving glacial melting in the Himalayas.<\/p>\n\n\n\n<p>However, a more <a href=\"https:\/\/www.nature.com\/articles\/s41558-020-00909-3.epdf?sharing_token=VJRkCP6eEq0pJ3WEYEmdPNRgN0jAjWel9jnR3ZoTv0PObK8Vd42cik8PXOKuvY318M-aE2HR3iwzaVQQh21Pbg4ai-n2IhIU-Pd4gB5Efqn6_Xgo1eiM1mKUdvhms_TsCBmQfOzoa9sQbKmWqtoSnMPfboVJNAd5hLSE1ZfLKLkm3t7ZpP5vRfe8ZW3a-bxzQYv1Xebyn_P-clunEry1RPFb-hoQpfNQsWofQdcpr54%3D&amp;tracking_referrer=www.theguardian.com\">recent study<\/a> published in November 2020 by a team of international researchers including Sarangi found that at altitudes above 4,000 metres, dust is a greater driver of melting than black carbon. Sarangi notes that \u201cthe majority of black carbon reaching HMA is emitted by anthropogenic activities in the Indus and Gangetic plains, which gets deposited at 0-3 km elevations. Hence, black carbon deposition is higher than dust below 3 km elevation and vice versa.\u200b\u201d<\/p>\n\n\n\n<p>While dust blowing from the Middle East to the high Himalayas is not a new phenomenon, it&nbsp;has only recently been understood to be one of the <a href=\"https:\/\/newsroom.ucla.edu\/releases\/dust-in-the-wind-is-making-himalayan-glaciers-melt\">primary causes of glacial melting<\/a>. Further research is needed to better understand if the amount of dust being blown across the continent has increased over the years, or if the same amount of dust is now having a larger impact on glaciers due to higher temperatures. Such research would not only help to better determine the role of dust in accelerating melting of glaciers in the Himalayas, but could also help in the design of interventions needed to minimise its impacts.<\/p>\n\n\n\n<div class=\"wp-block-cd-accordion block--accordion\"><span class=\"block--accordion__title\">More dust in the Earth&#8217;s atmosphere<\/span><div class=\"block--accordion__content\"><div class=\"block--accordion__content__inner\">\n<p><\/p>\n<\/div><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-sea-changes\">Sea changes<\/h2>\n\n\n\n<p>The winds that carry dust across the continent to the Himalayas also bring the consequences of glacial melting back to the Gulf region. Warming mountains mean warmer winds, which have begun to fundamentally shift monsoon patterns across Asia and the Middle East.<\/p>\n\n\n\n<a class=\"wp-block-cd-related-news alignright block--related-news loading\" data-post-id=\"20034124\"><div class=\"block--related-news__image\"><\/div><div class=\"block--related-news__content\"><span class=\"block--related-news__heading\">Recommended<\/span><span class=\"block--related-news__title\"><\/span><\/div><\/a>\n\n\n\n<p>Monsoons are integral to the ecosystems of the Arabian Gulf. <a href=\"https:\/\/nyuad.nyu.edu\/en\/academics\/divisions\/science\/faculty\/john-burt.html\">John Burt<\/a>, a marine biologist and professor at <a href=\"https:\/\/nyuad.nyu.edu\/en\/\">New York University Abu Dhabi<\/a> explains that \u201cwidespread coral bleaching in the Gulf is the result of low <em>shamal<\/em> winds [strong north-westerly winds that blow across the Middle East] during summer. Those <em>shamal<\/em> winds are generated by a pressure gradient driven by the monsoon. If the monsoon weakens, so will <em>shamals<\/em>, leading to more frequent and\/or severe coral bleaching in the Gulf region.\u201d Coral reefs in the Gulf are <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s00338-019-01767-y\">increasingly vulnerable<\/a>, and every effort should be made to protect this ecosystem from further damage.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41598-020-64360-2\">A study published in Nature<\/a> last year linked shrinking glaciers to the decline in fisheries in the Arabian Sea, caused by the same shifting winds. Altered monsoons have created the perfect conditions for a single-celled algal organism called <em>Noctiluca scintillans<\/em> to multiply by the millions. Harmful algal blooms suck oxygen from the water, creating oxygen deficiencies and suffocating fish populations. <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0025326X10003917\">Algal blooms exacerbate coral bleaching <\/a>and replace the indigenous algae that are a source of food for fish. <a href=\"https:\/\/dialogue.earth\/en\/climate\/harmful-algae-blooms-arabian-sea\/\">Scientists warn<\/a> that the spread of <em>Noctiluca <\/em>driven by changes in the Himalaya poses a significant threat to local fisheries in the Gulf, creating wide-reaching implications for food security.<\/p>\n\n\n\n<p>Burt warns that the same algal blooms that are choking fisheries also threaten the UAE\u2019s fresh water supply. \u201c<em>Noctiluca<\/em> is a major issue for desalination plants, where blooms will clog reverse osmosis filters and shut down operations. This happened with another algal bloom in early 2009, when a red tide resulted in <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S1568988309001048\">closure of desalination facilities<\/a> on the UAE&#8217;s east coast. The result was loss of potable water for much of the northern Emirates.\u201d&nbsp;<\/p>\n\n\n\n<p>Through intercontinental winds blowing in both directions, the crisis facing the Himalayas&#8217; glaciers is intimately linked to the Arabian Gulf in both its causes and effects. It is clear that the fate of the two regions is intertwined and that we cannot continue to view climate change in the Himalayas as a solely regional threat. In addition to the direct ecosystem-level link between the Himalayas and the Gulf, socio-economic impacts, particularly through increased stress in South Asia, are just as pressing.<\/p>\n\n\n\n<p>While it may be difficult to limit the dust that ends up in the Himalayas and address the associated ecosystem impacts in the Arabian Gulf, more research is needed to fully explore the links between the regions, and what can be done to mitigate climate impacts at both ends of the system. What is clear is that there needs to be more dialogue with the Gulf countries to support timely interventions, including in research, to come up with solutions before it\u2019s too late. &nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ecosystems and livelihoods separated by thousands of miles are closely linked by wind patterns that sweep the Asian continent<\/p>\n","protected":false},"author":20000893,"featured_media":20078040,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761],"tags":[537,50040713,20000022,20000628,50040707],"hashtags":[],"country":[20000111,20000112,50040701],"class_list":["post-20078039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","tag-ecosystems","tag-glaciers","tag-himalayas","tag-science","tag-the-third-pole","country-india","country-pakistan","country-saudi-arabia"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dust in the Himalayas melts mountains and changes seas | Dialogue Earth<\/title>\n<meta name=\"description\" content=\"Dust from the Arabian Gulf region is a factor driving melting of glaciers in the Himalayas, 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