Accelerator Mass Spectrometry and Marine Biogeochemistry

海洋溶解性有机物和颗粒性有机物（DOM、POM）是海洋中影响最大的两个碳氮储集层。两者都在调节地球气候方面发挥着重要作用。先前的研究表明，大小和组成是决定DOM和POM生物可利用性和循环的重要因素。沃克博士将使用先进的尺寸分馏，同位素测量和分子水平的方法来更好地表征DOM和POM。他将利用新的应用加速器质谱（AMS）技术来推进我们对化学海洋学的理解，并揭示在现代到千年的时间尺度上控制DOM和POM生物地球化学循环及其深海储存的新过程。

Marine dissolved and particulate organic matter (DOM, POM) are two of the oceans most influential carbon and nitrogen reservoirs. Both play an important role in regulating Earths climate. Previous work suggests size and composition are important in determining DOM and POM biological availability and cycling. Dr. Walker will use advanced size-fractionation, isotopic measurements and molecular-level approaches to better characterize DOM and POM. He will utilize new applied accelerator mass spectrometry (AMS) techniques to advance our understanding of chemical oceanography and reveal new processes controlling DOM and POM biogeochemical cycling, and their deep ocean storage, on modern to millennial timescales.