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随着高温热浪袭击了孟加拉、中国、印度、缅甸和巴基斯坦，本月亚洲气温记录被刷新。国际山地发展中心（ICIMOD）的科学家们敦促全球政府和企业加快减排速度，发展机构来投入更多的气候资金，以努力加快脚步来帮助该地区适应气候变化。
周一（4 月 17 日）孟加拉首都达卡的气温达到41 摄氏度，印度普拉亚格拉吉达到 45 摄氏度，缅甸葛礼瓦达到 44 摄氏度。中国长沙、福州创当地最早入夏记录，浙江的几个城市也刷新了全省4月最高气温记录。 4 月 23 日，巴基斯坦九个城市的气温达到 40 度以上。
高温造成死亡、学校关闭，人们无法工作——均加剧了该地区现有的脆弱性，尤其是贫困和饥饿。
“在亚洲，人为引起的气候变化是我们所见的高温热浪数量与强度不断增加的主要原因。这些信号表明该地区已经出现气候紧急情况，”ICIMOD 的气候和环境专家迪普希卡 沙玛 (Deepshikha Sharma) 说。
ICIMOD 高级经济学家兼粮食系统专家阿毕德·侯赛因 (Abid Hussain) 说：“所有气候模型都表明，南亚地区的热浪峰值的频率和强度上将增加。这会直接影响 20 亿人，即对健康和工作的影响，或间接影响冰川融化、洪水、水文变化、反常降雨及山体滑坡。”
高温热浪来袭之际，联合国世界气候报告显示，南极海冰降至有记录以来的最低水平，欧洲阿尔卑斯山的冰川融化“直接突破了图表下限”。
兴都库什-喜马拉雅地区坐拥世界第三大冰冻水体，其变暖速度是全球平均水平的两倍。温度升高意味着冰川融化速度更快，由此产生的冰川融水更难以预测。随着气温持续上升和冰川萎缩，会导致该地区用水和粮食的安全问题，并增加山洪等灾害的可能性。 “由于机构和社区能力不足，大部分灾害都可能演变成灾难，”侯赛因说。
“在最乐观的情况下，将全球变暖限制在 1.5 ℃内，到2100 年，该地区也将失去三分之一的冰川——这将给山区、生态系统、自然界，以及河流下游四分之一的居民带来巨大风险，” 沙玛说。在过去六十年中，兴都库什-喜马拉雅地区的冰层消融速度一直在加快，甚至海拔 6千米以上的冰面也在变薄。
“现阶段，气温变化的速度比我们担心的要快得多，1.5 摄氏度的警告属实太热了，” 沙玛说。 “当务之急是我们在减排和气候适应融资规模等方面取得快速且重大进展，并在适应灾害和减灾风险的措施方面产生更大的影响，以保护人与生态系统，因为与日俱增的脆弱性并不是当地居民的过错。”
ICIMOD 与 NASA、USAID 和其他合作伙伴合作，通过 服务新都库什-喜马拉雅倡议（SERVIR-HKH initiative）来监测与预测区域干旱和极端天气事件，并与我们八个区域成员国的公共机构共享此 区域干旱监测和展望数据（Regional Drought Monitoring and Outlook data）。
Millets are one of the Future Smart Foods (FSFs), indigenous to Nepal. Millets are rich in micronutrients, more resilient to water and heat stresses and can be cultivated in marginal lands and at different altitudes ranging from plain terai to high hills. They can contribute to the overall sustainability of food systems through their potential contribution to nutrition security, rural income, and resilience to climate change. Beyond their immediate agricultural significance, millets offer potential in advancing agro-/eco-tourism and culinary science. This research paper, rooted in rigorous peer review and a SWOT analysis of the current millet landscape, develops an operational framework. This framework, exemplified through the case of millets, outlines a sustainable, long-term approach for the revival of traditional crops, thereby ensuring the sustainability of food systems in Nepal. In addition to this, the paper provides recommendations that span multiple fronts, including behavioral, technological, market, and policy aspects, to facilitate the revival of millets within the food system. By adopting a holistic approach that considers behavioral changes, technological innovations, market dynamics, and policy measures, we can create an enabling environment for the sustainable revitalization of millets and other FSFs. This comprehensive strategic way will not only contribute to the restoration of agrobiodiversity and dietary diversity but also enhance the resilience of Nepal's food systems in the face of climate change and other challenges.
The high‐humidity mountain forest ecosystem (HHMF) of Jinyun Mountain in Chongqing is a fragile ecosystem that is sensitive to climate change and human activities. Because it is shrouded in fog year‐round, illumination in the area is seriously insufficient. However, the flux (energy, wa-ter) exchanges (FEs) in this ecosystem and their influencing factors are not clear. Using one‐year data from flux towers with a double‐layer (25 m and 35 m) eddy covariance (EC) observation sys-tem, we proved the applicability of the EC method on rough underlying surfaces, quantified the FEs of HHMFs, and found that part of the fog might also be observed by the EC method. The observation time was separated from day and night, and then the environmental control of the FEs was determined by stepwise regression analysis. Through the water balance, it was proven that the negative value of evapotranspiration (ETN), which represented the water vapor input from the atmosphere to the ecosystem, could not be ignored and provided a new idea for the possible causes of the evaporation paradox. The results showed that the annual average daily sensible heat flux (H) and latent heat flux (LE) ranged from −126.56 to 131.27 W m−2 and from −106.7 to 222.27 W m−2, respectively. The annual evapotranspiration (ET), positive evapotranspiration (ETP), and negative evapotranspi-ration (ETN) values were 389.31, 1387.76, and −998.45 mm, respectively. The energy closure rate of the EC method in the ecosystems was 84%. Fog was the ETN observed by the EC method and an important water source of the HHMF. Therefore, the study area was divided into subtropical mountain cloud forests (STMCFs). Stepwise regression analysis showed that the H and LE during the day were mainly determined by radiation (Rn) and temperature (Tair), indicating that the energy of the ecosystem was limited, and future climate warming may enhance the FEs of the ecosystem. Addi-tionally, ETN was controlled by wind speed (WS) in the whole period, and WS was mainly affected by altitude and temperature differences within the city. Therefore, fog is more likely to occur in the mountains near heat island cities in tropical and subtropical regions. This study emphasizes that fog, as an important water source, is easily ignored in most EC methods and that there will be a large amount of fog in ecosystems affected by future climate warming, which can explain the evaporation paradox. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Climate change-induced hazards, such as rising temperature, uncertain rainfall, heat stress, drought, and floods impose significant stresses on the Himalayan region, leading to disruption of infrastructure and other socio-ecological systems in urban and rural areas. To address such challenges, ICLEI South Asia and ICIMOD have jointly developed a training manual for the local authorities as well as decision-makers and practitioners to prepare a climate resilience strategy that can address climate mitigation and adaptation aspects through consultative participation of local stakeholders. The manual is developed under the Climate and Development Knowledge Network programme.
Climate extremes, such as heat waves, droughts, extreme rainfall can lead to harvest failures, flooding and consequently threaten the food security worldwide. Improving our understanding about climate extremes can mitigate the worst impacts of climate change and extremes. The objective here is to investigate the changes in climate and climate extremes by considering two time slices (i.e., 1962–1990 and 1991–2019) in all climate zones of Pakistan by utilizing observed data from 54 meteorological stations. Different statistical methods and techniques were applied on observed station data to assess changes in temperature, precipitation and spatio-temporal trends of climatic extremes over Pakistan from 1962 to 2019. The Mann-Kendal test demonstrated increasing precipitation (DJF) and decreasing maximum and minimum temperatures (JJA) at the meteorological stations located in the Karakoram region during 1962–1990. The decadal analysis, on the other hand, showed a decrease in precipitation during 1991–2019 and an increase in temperature (maximum and minimum) during 2010–2019, which is consistent with the recently observed slight mass loss of glaciers related to the Karakoram Anomaly. These changes are highly significant at 5% level of significance at most of the stations. In case of temperature extremes, summer days (SU25) increased except in zone 4, TX10p (cold days) decreased across the country during 1962–1990, except for zones 1 and 2. TX90p (warm days) increased between 1991–2019, with the exception of zone 5, and decreased during 1962–1990, with the exception of zones 2 and 5. The spatio-temporal trend of consecutive dry days (CDD) indicated a rising tendency from 1991 to 2019, with the exception of zone 4, which showed a decreasing trend. PRCPTOT (annual total wet-day precipitation), R10 (number of heavy precipitation days), R20 (number of very heavy precipitation days), and R25mm (very heavy precipitation days) increased (decreased) considerably in the North Pakistan during 1962–1990 (1991–2019). The findings of this study can help to address some of the sustainable development goals related climate action, hunger and environment. In addition, the findings can help in developing sustainable adaptation and mitigation strategies against climate change and extremes. As the climate and extremes conditions are not the uniform in all climate zone, therefore, it is suggested to the formers and agriculture department to harvest crops resilient to the climatic condition of each zone. Temperature has increasing trend in the northern Pakistan, therefore, the concerned stakeholders need to make rational plans for higher river flow/flood situation due to snow and glacier melt. Copyright: © 2022 Khan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Restrictions on human and industrial activities due to the coronavirus (COVID-19) pandemic have resulted in an unprecedented reduction in energy consumption and air pollution around the world. Quantifying these changes in environmental conditions due to government-enforced containment measures provides a unique opportunity to understand the patterns, origins and impacts of air pollutants. During the lockdown in Pakistan, a significant reduction in energy demands and a decline of ∼1786 GWh (gigawatt hours) in electricity generation is reported. We used satellite observational data for nitrogen dioxide (NO2), carbon monoxide (CO), sulphur dioxide (SO2), aerosol optical depth (AOD) and land surface temperature (LST) to explore the associated environmental impacts of shifts in energy demands and emissions across Pakistan. During the strict lockdown period (March 23 to April 15, 2020), we observed a reduction in NO2 emissions by 40% from coal-based power plants followed by 30% in major urban areas compared to the same period in 2019. Also, around 25% decrease in AOD (at 550 nm) thickness in industrial and energy sectors was observed although no major decrease was evident in urban areas. Most of the industrial regions resumed emissions during the 3rd quarter of April 2020 while the urban regions maintained reduced emissions for a longer period. Nonetheless, a gradual increase has been observed since April 16 due to relaxations in lockdown implementations. Restrictions on transportation in the cities resulted in an evident drop in the surface urban heat island (SUHI) effect, particularly in megacities. The changes reported as well as the analytical framework provides a baseline benchmark to assess the sectoral pollution contributions to air quality, especially in the scarcity of ground-based monitoring systems across the country.
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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高海拔湿地脆弱的生态系统特别容易受到气候变化的影响，包括气温上升、冰川退缩和降水模式改变。 这些变化对这些生态系统的生物多样性和功能构成直接威胁。 湿地对人类生活至关重要。2月2日是世界湿地日，作为联合国国际日，旨在增强人们对保护和恢复世界湿地的意识。今年的主题是“湿地与人类福祉”，强调了人类生活与湿地之间的密切联系，这一联系自人类诞生以来就一直存在。 随着文明的发展，许多人类居住区建立在湿地（包括淡水和咸水湿地）附近，如湖泊、河流、沼泽、湿地、湿地草原、泥炭地、绿洲、河口、三角洲、潮滩、红树林、珊瑚礁以及地下含水层。人类从湿地获取水源，用于饮用、清洗、农作物灌溉以及牲畜用水。此外，湿地也视作娱乐和灵感的来源，并具有深远的宗教和文化意义。 在兴都库什-喜马拉雅地区，湿地面积占地区总面积的10%，使其成为全球高海拔湿地最丰富的地区之一。湿地与人类福祉之间密切联系的一个例子是位于西藏冈仁波齐山脚下、海拔 4550 米的玛旁雍措湖。这个神圣的湖泊不仅因其令人惊叹的美丽而吸引游客，还因其深刻的精神和宗教意义，特别是对于苯教、佛教、印度教和耆那教的追随者而言。每年，数千人从世界各地前往玛旁雍措湖朝圣，寻求精神、心灵和情感上的疗愈。 湿地面临的威胁及其保护的重要性 高海拔湿地脆弱的生态系统特别容易受到气候变化的影响，包括气温上升、冰川退缩和降水模式改变。这些变化对湿地生态系统的生物多样性和功能构成直接威胁。其他威胁还来自于不受监管的旅游业、基础设施开发和过度放牧。 重要的是要管理和保护这些区域，因为它们具有多重价值。例如，位于不丹旺杜·普兰区海拔3000米的布吉卡（Phobjikha）湿地，是黑颈鹤（Grus nigricollis）的重要栖息地。布吉卡是观鸟的主要地点，这种活动反映了人类与自然之间的和谐关系。由于在该区域的保护工作以及它是吉格梅·多吉国家公园和吉格梅·辛格·旺楚克国家公园之间的重要生物走廊，迁徙鸟类的数量正在增加。不丹在湿地保护方面的关注反映了人与鹤以及宗教信仰和实践之间的深层精神联系。“不丹的拉姆萨尔地点通过保护黑颈鹤的重要栖息地，特别是在甘特伊-布吉附近，间接地为人类福祉做出了贡献，”不丹皇家自然保护协会执行董事金利·丹增（Kinley Tenzing）表示。 拥抱湿地潜力与人类福祉 许多组织和政府机构致力于通过社区项目、可持续旅游业和研究来保护在兴都库什-喜马拉雅地区的高海拔湿地。认识到其重要性并采取可持续实践不仅是一种生态责任，也是保障当地社区和游客福祉与生计的一种手段。 在国际山地综合发展中心（ICIMOD）当前的四年MTAP-V计划期间，我们的相关团队计划对重要湿地（主要是拉姆萨尔湿地、具有国际重要性的湿地）和兴都库什-喜马拉雅地区的泥炭地的管理状况进行测绘和快速评估，以倡导政策变化，增加兴都库什-喜马拉雅国家对这些领域管理的投资，并确定区域合作领域。2023年12月，南亚湿地国际组织（WISA）和ICIMOD举办了南亚地区拉姆萨尔国家联络点圆桌会议，主题是“通过区域合作和交流明智地利用南亚湿地”。 会议的目的是制定南亚湿地保护和明智利用区域平台的运作模式。 保护和恢复我们的湿地，以改善人类福祉 湿地的持续存在取决于我们人类如何对待它们。在这一领域采取行动非常重要，因为自 1700 年代以来，世界上近 90% 的湿地已经消失——自 1970 年以来，已有 35% 的湿地消失，目前它们消失的速度是森林的 3 倍。这方面的人类活动包括用于农业和建筑的排水和填埋湿地、污染、过度捕捞和资源过度开发、入侵物种和气候变化。这种令人沮丧的情景在兴都库什-喜马拉雅地区的各个湿地中都有所体现。相反，湿地被发现可以改善和恢复人类的身体和精神健康。 对我们所有人来说，提高对本地区湿地（尤其是高海拔湿地）的了解至关重要，并教育其他人认识其巨大的生态、精神、心理和经济价值。在区域和政策层面，我们必须鼓励决策者更加关注湿地的综合管理。毕竟，人类健康取决于湿地的健康。 为了保护我们的湿地及其脆弱的生物多样性和生态系统，今年2 月 5 日至 ...
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