Carbonate system dynamics and biogeochemistry in a changing Arctic

北极是大气中二氧化碳的一个重要汇，二氧化碳是一种强大的温室气体。然而，随着北极变暖和夏季海冰范围的减少（预计在几十年内，夏季北冰洋将无冰），目前尚不清楚这种变化的程度。研究人员将探索二氧化碳化学沿着冰缘（边缘冰区：MIZ）沃茨与公海的不同。在2021年5月20日至6月14日期间，从白令海到楚科奇海的MIZ，在RV Sikuliaq上采集水样，调查人员将测量海水中二氧化碳系统的几个组成部分，包括碳的总浓度，并确定水可以中和多少酸度。这项研究将使人们更好地了解北极地球化学的复杂性及其在变暖世界中碳封存和海洋酸化中不断变化的作用。研究人员将在研究巡航期间制作一个播客系列，分享他们的经验和社区科学的发现。北冰洋夏季海冰预计将消退，在短短几十年内，新的规范将是无冰的夏天。在2021年5月20日至6月14日期间，从白令海到楚科奇海的边缘冰区，在开放水域逐渐被冰覆盖的区域（冰融化是一个重要的信号），在RV Sikuliaq上采集水样，提供了一个独特的机会，可以更好地了解北极生物地球化学的复杂性及其随着夏季冰边缘的消退而在碳封存中不断变化的作用。通过检查碳酸盐系统/模型的内部一致性，这项工作将导致更好地了解对海洋酸化和海洋-大气CO2交换的控制。研究人员将检查重要的碳酸盐系统测量值，例如溶解的有机碳和无机碳，当与Sikuliaq上进行的平行汞测量相结合时，将提高我们对北极地区溶解元素汞和DIC之间关系的了解，无论是在开放水域还是在冰下。研究人员将为公民科学团体制作实践视频和材料，重点是极地地区。最后，研究人员将创建一个邮轮播客系列，将包括5到10分钟的播客，为公众介绍北极的变化，成为一名年轻的海洋学家是什么感觉，以及与研究相关的主题。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智力价值和更广泛的影响审查标准进行评估来支持。

The Arctic is an important sink for atmospheric carbon dioxide, a powerful greenhouse gas. However, as the Arctic warms and the extent of summer sea ice declines (in a few decades, it is expected the summer Arctic Ocean will be ice free), it is not clear the degree to which this will change. The investigators will explore how carbon dioxide chemistry along the ice margins (marginal ice zone: MIZ) waters differ from that in the open ocean. Taking water samples on the RV Sikuliaq between May 20 to June 14, 2021, from the Bering sea to the MIZ in the Chukchi Sea, the investigators will measure several components of the carbon dioxide system in seawater, including the total concentration of carbon, and determine how much acidity the water can neutralize. This study will provide a better understanding of the complexities of arctic biogeochemistry and its changing role in carbon sequestration and ocean acidification in a warmer world. The investigators will produce a podcast series during the research cruise to share their experiences and findings for community science.Arctic Ocean summer sea ice is predicted to retreat such that in just a few decades the new norm will be ice-free summers. Taking water samples on the RV Sikuliaq between May 20 to June 14, 2021, from the Bering sea to the marginal ice zone in the Chukchi Sea, the area where open water becomes progressively more ice-covered (and ice melt is a significant signal), presents a unique opportunity to better understand the complexities in arctic biogeochemistry and its changing role in carbon sequestration as the summer ice edge recedes. By examining the internal consistency of the carbonate system/models, the work will lead to an improved understanding of the controls on ocean acidification and ocean-atmosphere CO2 exchange. The investigators will examine important carbonate system measurements such as dissolved organic and inorganic carbon, that when coupled with parallel mercury measurements being taken on the Sikuliaq, will improve our understanding of the relationships between dissolved elemental Hg and DIC in the Arctic, both in the open water and under the ice. The investigators will generate hands-on videos and materials for citizen science groups with a focus on polar regions. Finally, the investigators will create a cruise podcast series that will comprise five to ten minute podcasts for the public on the changing arctic, what it’s like to be a young oceanographer, and themes related to the study.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.