RAPID: Investigation of Microbial:Black Carbon feedback Processes that Impact Icefield Melt in High Latitude Systems.

RAPID：影响高纬度系统中冰原融化的微生物：黑碳反馈过程的调查。

• 批准号: 2414438
• 负责人: Christine Foreman
• 金额: $ 9.93万
• 依托单位: Montana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2414438&HistoricalAwards=false
• 关键词: RAPID; Investigation; Microbial; Black; Carbon

Solar radiation is a primary driver of melting glacial ice and snow. Glaciers and high-elevation mountain snowpacks are therefore especially sensitive to even small changes in the concentration of light absorbing particles. Surface melt of snow and glacial ice is substantially higher if impurities such as mineral dust and organic matter are present in significant quantities. Bacteria and algae further promote darkening of the glacial surface and melting by aggregating these impurities in the form of biofilm. Like many mountain glaciers of the Alaskan region, the Juneau Icefield has seen extensive mass loss. Between 2005-2019 alone, sixty-three glaciers have disappeared. Models predict that the entire icefield will display a negative mass balance by the mid-21st century, with surface melt likely the driving mechanism of Alaskan glacier loss. Black carbon released by human and natural activities has become a major contributor to reducing snow and ice albedo. Microbes can affect the dynamics of black carbon on glacial surfaces, with biodegradation having profound implications on its residence time, light absorbance, and output to adjacent and downstream aquatic ecosystems.The proposed research leverages a Facilities Integrating Collaborations for User Science (FICUS) grant from Pacific Northwest National Laboratory (PNNL). The analytical support, access to state-of-the-art instrumentation, and expertise provided by the FICUS award will accelerate the speed of this timely research. The goals of the proposed study are to determine (i) the anthropogenic perturbation of the glacial carbon cycle due to black carbon depositions and (ii) degradation and transformation of black carbon by microbes. This project supports the necessary field work and associated costs, resources to disseminate results, and student involvement in sample analysis. Given the demonstrated sensitivity of the Juneau Icefields to ice loss and the broad implications for society and the environment it is timely and relevant to explore the relationship between black carbon-microbial processing-and ice loss, as well as determine how these complex interactions shape the fate of ice field and glacial environments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

太阳辐射是融化冰川冰雪的主要驱动力。因此，冰川和高海拔山脉的积雪特别敏感，即使在吸收光颗粒的浓度的少量变化中也是如此。如果矿物灰尘和有机物等杂质大量存在，雪和冰川冰的表面融化要高得多。细菌和藻类进一步促进了冰川表面的变暗，并通过以生物膜的形式汇总这些杂质来融化。像阿拉斯加地区的许多山地冰川一样，朱诺冰菲尔德（Juneau Icefield）遭受了广泛的群众损失。仅在2005年至2019年之间，六十三个冰川就消失了。模型预测，到21世纪中叶，整个Icefield将表现出负质量平衡，而表面融化可能是阿拉斯加冰川损失的驱动机制。人类和自然活动释放的黑碳已成为减少雪和冰反照率的主要贡献者。微生物可以影响冰川表面上黑碳的动态，生物降解对其停留时间，光吸光度和对邻近和下游水生生态系统的产量产生了深远的影响。拟议的研究利用了一种设施，该设施融合了从Pacific Northwest National National Laboratoration（Pnnl）融合了用户科学（FICUS）授予的合作。 FICUS奖提供的分析支持，获得最新工具的访问以及专业知识将加速这项及时研究的速度。拟议的研究的目标是确定（i）由于黑碳沉积而引起的冰川碳循环的人为扰动，以及（ii）微生物对黑碳的降解和转化。该项目支持必要的现场工作和相关成本，传播结果的资源以及学生参与样本分析。鉴于朱诺冰菲尔德对冰丧失的敏感性以及对社会的广泛影响以及它及时而相关的环境，探索黑色碳微生物加工和冰的损失与冰上的损失以及这些复杂的互动之间的关系，并确定这些复杂的相互作用如何塑造冰场和冰川环境的命运。这些奖项反映了NSF的智力范围和范围的范围。 标准。