EAGER: A novel approach to measure greenhouse gas emissions from coastal marine ecosystems

PI要求EAGER资助开发一种更好，更准确的方法来确定浅水海洋系统和大气之间的温室气体交换。如果成功，这将改变我们准确测量浅水海洋生态系统中温室气体的空气-水交换的能力。EAGER项目的结果将增加我们对水生生态系统如何帮助减轻人类产生的温室气体排放影响的理解。为了更好地预测预期的气候变化影响，并概述地方和全球的减缓倡议，需要对这一专题有更准确和基于过程的知识，地球加速变暖促使全球高度关注大气和水生系统，包括沿海沃茨之间的温室气体交换。由于直接测量的空气-水交换的温室气体，在这里定义为二氧化碳，甲烷，和N2 O，是复杂和具有挑战性的执行，今天的大多数估计是基于公布的一般经验关系，从交换系数估计和乘以特定地点的浓度差异在空气-水界面。EAGER的研究建议结合联合收割机倒置水涡度相关（AEC）测量的O2通量的空气-水界面与一个阵列的最好的这些新的温室气体传感器，并从以前的，提取温室气体特定的交换系数，以计算空气-水温室气体通量。如果新方法奏效，它将是变革性的，并有两个主要成果：它将大大改善应用它的温室气体空气-水交换的估计;它将导致对这种温室气体交换的复杂控制进行新的研究。这两项成果都是填补水生环境中温室气体交换的重要知识空白所迫切需要的。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

The PI requests EAGER funding to develop a better and more accurate approach for determining greenhouse gas exchange between shallow-water marine systems and the atmosphere. If successful, this would transform our ability to accurately measure air-water exchange of greenhouse gasses in shallow-water marine ecosystems. The results of this EAGER project would increase our understanding of how aquatic ecosystems can help mitigate the impacts of human generated greenhouse gas emissions. More accurate and process-based knowledge on this topic is needed to allow better predictions of climate change impacts that would be expected and to outline local and global mitigation initiatives.The accelerating warming of Earth has spurred an intense and global focus on greenhouse gas exchange between the atmosphere and aquatic systems, including coastal waters. As direct measurements of air-water exchange of greenhouse gasses, here defined as CO2, CH4, and N2O, are complex and challenging to perform, most estimates today are based on published general empirical relationships from which exchange coefficients are estimated and multiplied with site-specific concentration differences over the air-water interface. This EAGER research proposes to combine upside-down aquatic eddy covariance (AEC) measurements of O2 fluxes over the air-water interface with an array of the best of these new greenhouse gas sensors and, from the prior, to extract greenhouse gas-specific exchange coefficients in order to calculate air-water greenhouse gas fluxes. If the new approach works, it would be transformative and have two major outcomes: it will vastly improve estimates of greenhouse gas air-water exchange where it is applied; and it will lead to new lines of research on the complex controls of this greenhouse gas exchange. Both outcomes are urgently needed to fill important knowledge gaps on greenhouse gas exchange in aquatic 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.