"Collaborative Research: Constraining the marine nitrogen cycle using a new approach to measuring nitrogen isotopes of chlorins"

“合作研究：使用测量二氢卟酚氮同位素的新方法限制海洋氮循环”

• 批准号: 0825269
• 负责人: Ann Pearson
• 金额: $ 21.45万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825269&HistoricalAwards=false
• 关键词: Collaborative; Research; Constraining; marine; nitrogen

Given the hypothesized role for the marine nitrogen cycle in governing carbon cycling, reconstructions of nitrogen biogeochemistry are critical to improve our understanding of global geochemical cycles. Scientists from Harvard University and the University of Rhode Island propose to complete their development of a new analytical method to achieve reliable, high-throughput analyses of nitrogen isotope composition (del15N) values of sedimentary porphyrins. Values of porphyrin-del15N should reflect both the overall state of the nitrogen cycle, and in particular, conditions of nutrient supply and demand in the surface ocean. In addition, the scientists plan to measure the nitrogen isotopic fractionation in prokaryotes and eukaryotes, Last Glacial Maximum-to-Holocene sediments from sites characterized by different nitrogen dynamics, and analyze Mediterranean sapropels and Cretaceous Ocean Anoxic Events. The goal of this research is to help constrain the global importance of denitrification and nitrogen fixation.As regards broader impacts, results from this research will improve our understanding of water column biogeochemistry which will be critical in predicting the response of the nitrogen cycle to climatic events. One graduate student at Harvard University and one undergraduate student from the University of Rhode Island will be supported and trained.

鉴于海洋氮循环在控制碳循环中的假设作用，氮地球化学的重建对于提高我们对全球地球化学循环的理解至关重要。 来自哈佛大学和罗得岛大学的科学家们提议完成他们对一种新的分析方法的开发，以实现对沉积卟啉的氮同位素组成（del 15 N）值的可靠、高通量分析。 卟啉-del 15 N的值应反映氮循环的总体状况，特别是海洋表层营养物质的供应和需求状况。 此外，科学家计划测量原核生物和真核生物中的氮同位素分馏，来自不同氮动力学特征的地点的末次冰期最大至全新世沉积物，并分析地中海腐泥和白垩纪海洋缺氧事件。 这项研究的目的是帮助限制反硝化和固氮的全球重要性。至于更广泛的影响，这项研究的结果将提高我们对水柱生物地球化学的理解，这将是预测氮循环对气候事件的反应至关重要。 哈佛大学的一名研究生和罗得岛大学的一名本科生将得到支持和培训。

项目成果

Paleoenvironmental implications of taxonomic variation among δ15N values of chloropigments

• DOI: 10.1016/j.gca.2011.04.024
• 发表时间: 2011-11-15
• 期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
• 影响因子: 5
• 作者: Higgins, Meytal B.;Wolfe-Simon, Felisa;Pearson, Ann
• 通讯作者: Pearson, Ann

Evidence from chlorin nitrogen isotopes for alternating nutrient regimes in the Eastern Mediterranean Sea

• DOI: 10.1016/j.epsl.2009.12.009
• 发表时间: 2010-02-15
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Higgins, Meytal B.;Robinson, Rebecca S.;Pearson, Ann
• 通讯作者: Pearson, Ann

Dominant eukaryotic export production during ocean anoxic events reflects the importance of recycled NH4+

• DOI: 10.1073/pnas.1104313109
• 发表时间: 2012-02-14
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Higgins, Meytal B.;Robinson, Rebecca S.;Pearson, Ann
• 通讯作者: Pearson, Ann