National Ocean Sciences Accelerator Mass Spectrometry Facility

National Ocean Sciences Accelerator Mass Spectrometry Facility. It is a premier United States research center dedicated to accelerator mass spectrometry for oceanographic and environmental sciences. Established with support from the National Science Foundation, the facility is operated by the Woods Hole Oceanographic Institution in Massachusetts. Its primary mission is to provide high-precision isotopic measurements for the global scientific community, advancing understanding of Earth's climate system and biogeochemical cycles.

Overview

The facility serves as a national resource for measuring rare, long-lived radionuclides such as carbon-14, beryllium-10, and aluminum-26. It supports a wide array of disciplines including paleoceanography, Quaternary science, and marine geochemistry. By offering access to state-of-the-art AMS instrumentation, it enables researchers from institutions like the University of California, Irvine and the Lamont-Doherty Earth Observatory to conduct groundbreaking studies. The core operations are integrated within the Woods Hole Oceanographic Institution's Department of Marine Chemistry and Geochemistry, fostering collaboration with entities like the Scripps Institution of Oceanography.

Scientific Capabilities

The facility's technical prowess is centered on a tandem accelerator system capable of ultra-sensitive isotope ratio measurements. This allows for the detection of radiocarbon in milligram-sized samples of foraminifera, deep-sea corals, and sediment cores. Its protocols for analyzing beryllium-10 in ice cores from Greenland and Antarctica are internationally recognized. The laboratory maintains rigorous standards calibrated against international references such as those from the National Institute of Standards and Technology. Continuous development in sample preparation, often involving collaboration with the University of Washington, ensures minimal contamination and high data fidelity.

Research Applications

Research enabled by the facility has been critical for constructing radiocarbon calibration curves like IntCal20 and Marine20. These curves are fundamental for dating archaeological artifacts from sites like Çatalhöyük and climatic events recorded in the Sargasso Sea. Studies of ocean circulation utilize carbon-14 measurements in water masses from the North Atlantic Deep Water to the Southern Ocean. The facility's data have been pivotal in projects like the International Ocean Discovery Program and for understanding the dynamics of past events such as the Younger Dryas and the Heinrich events. Work on beryllium-10 has also contributed to research into solar variability and cosmogenic nuclide dating of geological surfaces.

Facility Operations and Access

Access to the facility is governed by a peer-review proposal system typically aligned with funding cycles from the National Science Foundation. Researchers from academic institutions, government agencies like the United States Geological Survey, and international partners can submit proposals for analytical time. The facility provides comprehensive support, from sample preparation guidance to data interpretation workshops. Its educational role includes training graduate students from partner universities and hosting visiting scientists from global organizations such as the Alfred Wegener Institute and the Australian Nuclear Science and Technology Organisation.

History and Development

The facility was founded in 1989 following a major NSF instrumentation grant, championed by oceanographers and geochemists from the Woods Hole Oceanographic Institution. Its creation was a direct response to the growing demand for AMS in oceanography, as highlighted by earlier work in programs like GEOSECS. Initial instrumentation was soon upgraded, with significant technological advances implemented throughout the 1990s in collaboration with engineers from Purdue University. The facility has continually evolved, incorporating new techniques for analyzing iodine-129 and supporting large-scale initiatives like the World Ocean Circulation Experiment. Its sustained funding underscores its vital role in the U.S. Global Change Research Program and the international Past Global Changes project.

Category:Research institutes in Massachusetts Category:Woods Hole Oceanographic Institution Category:Mass spectrometry Category:Oceanography