Postdoctoral Fellowship: OPP-PRF: Linkages among Sea Ice, Phytoplankton, and Carbon in the Marginal Ice Zone

博士后奖学金：OPP-PRF：边缘冰区海冰、浮游植物和碳之间的联系

• 批准号: 2317774
• 负责人: Jessica Turner
• 金额: $ 30.4万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-10-01 至 2025-09-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2317774&HistoricalAwards=false
• 关键词: Postdoctoral; Fellowship; OPP; PRF; Linkages

The West Antarctic Peninsula is one of the fastest warming regions in Antarctica, impacting carbon fluxes from the atmosphere to the ocean through effects on phytoplankton blooms, the microscopic marine plants that form the base of the food web. This project investigates changes in the seasonal timing, amount, and type of phytoplankton as the West Antarctic Peninsula warms and experiences sea ice loss. This study of a critically important ecosystem’s carbon cycle and shifting seasonal timing of events is relevant to all polar systems in the face of global climate warming. The proposed research will broaden our understanding of the impact of climate change on the seasonal timing of primary production and carbon uptake in a region experiencing the most rapid rate of sea ice loss in the Antarctic. The Southern Ocean is a massive regulator of the global carbon budget, but many unknowns remain about the role of phytoplankton. This work will look at two features of how phytoplankton influence carbon uptake that are often overlooked: phytoplankton community composition and phenology (i.e., the timing of seasonal events).The goal of the proposed work is to assess how physical and biological factors affect the seasonal timing, magnitude, and long-term trends of carbon flux from the atmosphere to the ocean. Researchers will incorporate data collected in West Antarctica with numerical modeling to test possible reasons why things are changing, and to test specific variables at the base of the food web. Observations will be used to evaluate long-term change, and models will be used to investigate likely causes for observed shifts, such as changes in sea ice, wind, ocean physics, cloudiness, and phytoplankton community composition. The objectives of the proposed work are to (1) analyze phenology shifts, (2) investigate phytoplankton community composition using pigment and flow-through imaging data from the Palmer Long-Term Ecological Research program, (3) evaluate possible reasons for shifts in phenology using modeling case studies, and (4) compare the relative impacts of biological factors versus physical factors on carbon flux and phenology shifts using modeling experiments. Outreach and education activities include blog and video development for the Palmer Long-Term Ecological Research (LTER) program, mentoring of undergraduate college students, and K-12 lesson plan development in alignment with Polar Literacy Principles.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.

南极西部半岛是南极洲变暖最快的地区之一，通过影响浮游植物的繁殖（构成食物网的基础的微观海洋植物）来影响从大气到海洋的碳通量。该项目调查季节时间的变化。随着西南极半岛变暖和经历海冰消失，浮游植物的数量、数量和类型这项对极其重要的生态系统碳循环和事件季节变化的研究与所有极地系统相关。面对全球气候变暖，拟议的研究将加深我们对气候变化对南极海冰流失速度最快的地区初级生产和碳吸收的影响的理解。是全球碳预算的重要调节者，但浮游植物的作用仍然存在许多未知数。这项工作将研究浮游植物如何影响碳吸收的两个经常被忽视的特征：浮游植物群落组成和物候。 （即季节性事件的时间）。拟议工作的目标是评估物理和生物因素如何影响从大气到海洋的碳通量的季节时间、幅度和长期趋势。研究人员将整合数据。通过数值模型在南极洲西部收集数据，以测试事物发生变化的可能原因，并测试食物网底部的特定变量。观察结果将用于评估长期变化，模型将用于调查可能的原因。观察到的变化，例如海冰的变化，风、海洋物理、云量和浮游植物群落组成拟议工作的目标是（1）分析物候变化，（2）使用帕尔默长期生态研究的色素和流通成像数据研究浮游植物群落组成。计划，（3）使用建模案例研究评估物候变化的可能原因，以及（4）使用建模实验（包括博客和视频）比较生物因素与物理因素对碳通量和物候变化的相对影响。帕尔默长期生态研究 (LTER) 计划的开发、本科生的指导以及根据极地识字原则制定 K-12 课程计划。该奖项是 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。