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25 Apr 2023 | Press releases

Worst April heatwave in Asian history: Scientists urge action to avert catastrophic impacts across HKH

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With Bangladesh, China, India, Myanmar and Pakistan all hit by crippling heat as temperature records were broken across Asia this month, scientists at ICIMOD are urging global governments and businesses to make faster emissions reductions and development agencies to invest greater climate finance in efforts to accelerate adaptation for the region.

Temperatures on Monday (17 April) reached 41 degrees centigrade in Dhaka, Bangladesh, 45 degrees in Prayagraj, in India, and 44 in Kalewa, Myanmar. In China, Changsha and Fuzhou set the earliest local records for the commencement of summer, and several cities in Zhejiang Province broke their record for the highest daily temperature in April. On April 23 nine cities in Pakistan recorded temperatures of 40 and above.

The heat has resulted in deaths, schools closing and people being unable to work – compounding existing vulnerabilities, especially poverty and hunger, across the region.

“Human-induced climate change is the major cause of the growing number and ferocity of heat-waves we’re seeing across Asia. These signal to the fact that the climate emergency is here for this region,” says Deepshikha Sharma, a Climate and Environment Specialist at ICIMOD.

Abid Hussain, Senior Economist & Food Systems Specialist at ICIMOD says: “All climate models show that these spikes in heat are going to increase in frequency and intensity across South Asia. Such heat-waves will impact 2 billion people either directly, in terms of heat impacts on health and work, or indirectly in terms of glacier melt, floods, water variability, erratic rainfall and landslides.”

The heatwaves come as the United Nations State of the World Climate report shows Antarctic sea ice falling to its lowest extent on record and the melting of glaciers in the European Alps as “literally off the charts.”

The Hindu Kush Himalaya, which holds the third largest body of frozen water in the world, is warming at double the global average. Higher temperatures mean that glaciers melt faster and the resulting water flowing into rivers is less predictable. As temperatures continue to rise and glaciers get smaller, this leads to water scarcity and food insecurity in the region as well as increasing the likelihood of hazards such as flash floods. “Because of inadequate institutional and community capacity, most of these hazards are likely to turn into disasters,” says Hussain.

“In the most optimistic scenario, limiting global warming to 1.5 C, the region stands to lose one third of its glaciers by 2100 – creating huge risk to mountain communities, ecosystems and nature and the quarter of humanity downstream,” says Sharma. The rate of ice mass loss in the Hindu Kush Himalayas has consistently accelerated over the past six decades and glaciers even above 6,000 metres above sea level are thinning.

“Changes are now happening far faster than we feared and 1.5 degrees of warning is simply too hot,” says Sharma. “It is urgent that we make rapid and drastic progress in emissions reductions and scale adaptation finance, and for a much greater impact in adaptation and disaster risk reduction measures to protect the people and ecosystems, whose vulnerabilities are increasing by the day through no fault of their own.”

ICIMOD works with NASA, USAID and partners to monitor and predict regional droughts and extreme weather events through its SERVIR-HKH initiative. It shares this Regional Drought Monitoring and Outlook data with public bodies in our eight regional member countries.

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Study on the Water and Heat Fluxes of a Very Humid Forest Ecosystem and Their Relationship with Environmental Factors in Jinyun Mountain, Chongqing

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Planning for climate resilience in Nepal: A training manual for local governments

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Environmental impacts of shifts in energy, emissions, and urban heat island during the COVID-19 lockdown across Pakistan

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Mapping the aerodynamic roughness of the Greenland Ice Sheet surface using ICESat-2: Evaluation over the K-transect

The aerodynamic roughness of heat, moisture, and momentum of a natural surface are important parameters in atmospheric models, as they co-determine the intensity of turbulent transfer between the atmosphere and the surface. Unfortunately this parameter is often poorly known, especially in remote areas where neither high-resolution elevation models nor eddy-covariance measurements are available. In this study we adapt a bulk drag partitioning model to estimate the aerodynamic roughness length (z0m) such that it can be applied to 1D (i.e. unidirectional) elevation profiles, typically measured by laser altimeters. We apply the model to a rough ice surface on the K-transect (west Greenland Ice Sheet) using UAV photogrammetry, and we evaluate the modelled roughness against in situ eddy-covariance observations. We then present a method to estimate the topography at 1 m horizontal resolution using the ICESat-2 satellite laser altimeter, and we demonstrate the high precision of the satellite elevation profiles against UAV photogrammetry. The currently available satellite profiles are used to map the aerodynamic roughness during different time periods along the K-transect, that is compared to an extensive dataset of in situ observations. We find a considerable spatio-temporal variability in z0m, ranging between 10−4 m for a smooth snow surface and 10−1 m for rough crevassed areas, which confirms the need to incorporate a variable aerodynamic roughness in atmospheric models over ice sheets

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