Postdoctoral Fellowship: OPP-PRF: Tracking Long-Term Changes in Lake Area across the Arctic

博士后奖学金：OPP-PRF：追踪北极地区湖泊面积的长期变化

• 批准号: 2317873
• 负责人: Elizabeth Webb
• 金额: $ 35.4万
• 依托单位: University of Oregon Eugene
• 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: 2024-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2317873&HistoricalAwards=false
• 关键词: Postdoctoral; Fellowship; OPP; PRF; Tracking; Postdoctoral; Fellowship; OPP; PRF; Tracking

There are more lakes and ponds in the Arctic than anywhere else in the world. These lakes provide habitat for wildlife and support the subsistence activities of Indigenous communities. Arctic lakes are also an important component of the climate system. Changes in lake area could strengthen or reduce climate change feedbacks, depending on whether lakes expand or shrink. Previous research shows that climate change is causing Arctic lake area to change, but the overall trend is unclear. This project uses high-resolution satellite data to assess the direction and magnitude of surface water change in the Arctic. Based on project findings, the PI will develop a set of best practices for tracking Arctic lake area change and determine whether lakes are expanding or shrinking in five Arctic regions. This research aims to reduce uncertainties in the magnitude and direction of Arctic lake area change by advancing understanding of interannual variation and developing a methodological approach to identify long-term trends in Arctic surface water. The researcher will use Planet (3 m) images to generate multi-year high resolution maps of surface water in five Arctic regions: the Arctic Coastal Plain, the Yukon-Kuskokwim Delta, the Yukon Flats, the Mackenzie River Delta, and the Tuktoyaktuk Peninsula. These high-resolution maps will be used as a reference for quantifying the accuracy and sensitivity of existing coarse resolution (i.e., Landsat and MODIS) surface water products. Based on the outcome of this methodological comparison, the researcher will develop a set of best practices for tracking Arctic lake area change with coarse resolution (e.g., Landsat) images, and, in regions where previous work is inconclusive, determine whether lake area has increased or decreased over the past twenty years.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.

北极的湖泊和池塘比世界其他任何地方都多。这些湖泊为野生动植物提供了栖息地，并支持土著社区的生存活动。北极湖也是气候系统的重要组成部分。湖泊区域的变化可以增强或减少气候变化的反馈，具体取决于湖泊的扩张还是收缩。先前的研究表明，气候变化正在导致北极湖地区发生变化，但总体趋势尚不清楚。该项目使用高分辨率卫星数据来评估北极中地表水变化的方向和幅度。根据项目发现，PI将开发一组最佳实践，用于跟踪北极湖区的变化，并确定湖泊在五个北极地区的扩张还是缩小。这项研究旨在通过促进对年际变化的理解并开发一种方法学方法来识别北极地表水的长期趋势，从而减少北极湖地区变化的不确定性。研究人员将使用行星（3 m）图像在五个北极地区生成多年高分辨率地表水：北极沿海平原，育空地区 - 库斯科克维姆三角洲，育空地区，麦肯齐河三角洲和tuktoyaktuk peninsula。这些高分辨率地图将用作量化现有粗分辨率（即Landsat和Modis）地表水产品的准确性和灵敏度的参考。基于此方法学比较的结果，研究人员将开发一组最佳实践，以跟踪北极湖区的变化，而粗略分辨率（例如，Landsat）图像，并且在先前工作不确定的地区，确定湖泊地区的判例是否增加或减少，在过去的二十年中，这些奖项反映了NSF的合法任务和范围的范围。 标准。