Acquisition of spectroscopic and mass spectrometric instrumentation for the evaluation of N cycling and provenance

GSTDTAP

项目编号	1456430
	Acquisition of spectroscopic and mass spectrometric instrumentation for the evaluation of N cycling and provenance
	Nathaniel Ostrom
主持机构	Michigan State University
项目开始年	2015
	2015-07-01
项目结束日期	2017-06-30
资助机构	US-NSF
项目类别	Continuing grant
项目经费	199805(USD)
国家	美国
语种	英语
英文摘要	1456430 Ostrom Studies of the isotopic composition of Nitrogen in various species yield insights on the dynamics of biogeochemical processes and recent results suggest that within the North Pacific Ocean, long-term nitrogen isotope chronologies are indicating a marked ecosystem state change raising questions as to whether the signal indicates a trophic decline resultant from overfishing by humans that has shifted the entire trophic structure of the oceanic food web and/or an increase in nitrogen fixation linked to climate-coupled changes in the environment. This grant supports acquisition of a gas source stable isotope ratio mass spectrometer (SIRMS), a laser optical cavity ring down mass spectrometer (LCOS), materials to construct a compressor system for filling air tanks with a range of N2O concentrations and isotopic compositions, and a gas chromatography nitrogen (GC-N) compound specific isotope analysis system capable of improved amino acid ä15N values. The equipment will foster investigator research focused on global nitrogen cycling in the oceans and aquatic systems with targeted studies of the stable isotopic composition of Nitrogen in Nitrous Oxide (N2O), a greenhouse gas and within amino acids recovered from aquatic and marine organism tissues. The requested equipment will replace an aging SIRMS at Michigan State, the LCOS will allow comparative studies of the value and precision of laser-based isotopic analysis versus traditional SIRMS analysis and the PI will prepare and make available to the broader community a suite of N isotopic standards needed for LCOS measurements.
来源学科分类	Geosciences - Earth Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/68208
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Nathaniel Ostrom.Acquisition of spectroscopic and mass spectrometric instrumentation for the evaluation of N cycling and provenance.2015.