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Earth Observing Laboratory
Field Data Archive

Dataset List

    14578 datasets found (100 shown). Full dataset descriptions and data access links are available by selecting the dataset title.
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    Dataset Projects Responsible parties Version/Date
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Aerosol Observing System (AOS) data in the DOE ARM Data Archive. You must have an ARM Archive account to access...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Aerosol Observing System (AOS) Meteorological (AOSMET) data in the DOE ARM Data Archive. You must have an ARM...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Aerosol Optical Properties (AOP) data in the DOE ARM Data Archive. You must have an ARM Archive account to access...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Balloon-Borne Sounding System (SONDE) data in the DOE ARM Data Archive. You must have an ARM Archive account to...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Boundary-layer height data with Ceilometer (CEILPBLHT) data in the DOE ARM Data Archive. You must have an ARM...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Camera data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Carbon Monoxide Analyzer (CO-ANALYZER) data in the DOE ARM Data Archive. You must have an ARM Archive account to...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Ceilometer (CEIL) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Cloud Condensation Nuclei (CCN) Particle Counter data in the DOE ARM Data Archive. You must have an ARM Archive...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Cloud mask from Micropulse Lidar (MPLCMASK) data in the DOE ARM Data Archive. You must have an ARM Archive account...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Condensation Particle Counter (CPC) data in the DOE ARM Data Archive. You must have an ARM Archive account to...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Exhaust Identification Product data in the Australian Antarctic Data Centre. You must have an ARM Archive account...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Humidified Tandem Differential Mobility Analyzer (HTDMA) data in the DOE ARM Data Archive. You must have an ARM...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Ice Spectrometer campaign data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Infrared Thermometer (IRT) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Laser Disdrometer (LDIS) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Marine Surface Meteorological Instrumentation (MARINEMET) data in the DOE ARM Data Archive. You must have an ARM...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Marine Precipitation Instrumentation (MARINEPRECIP) data in the DOE ARM Data Archive. You must have an ARM Archive...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Marine W-Band (95 GHz) ARM Cloud Radar (MWACR) data in the DOE ARM Data Archive. You must have an ARM Archive...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Marine W-band ARM Cloud Radar, Active Remote Sensing of Clouds (MWACRARSCL) data in the DOE ARM Data Archive. You...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Micropulse Lidar (MPL) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Microwave Radiometer (MWR) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Microwave Radiometer (MWR) Retrievals (MWRRET) data in the DOE ARM Data Archive. You must have an ARM Archive...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Microwave Radiometer, 3 Channel (MWR3C) data in the DOE ARM Data Archive. You must have an ARM Archive account to...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Minnis Cloud Products Using VISST Algorithm Retrievals (MWRRET) data in the DOE ARM Data Archive. You must have an...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Navigational Location and Attitude (NAV) data in the DOE ARM Data Archive. You must have an ARM Archive account to...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Nephelometer data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Ozone Monitor data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Particle Soot Absorption Photometer (PSAP) data in the DOE ARM Data Archive. You must have an ARM Archive account...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Planetary Boundary Layer Height (PBLHT) data in the DOE ARM Data Archive. You must have an ARM Archive account to...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Portable Radiation Package (PRP) Retrievals (MWRRET) data in the DOE ARM Data Archive. You must have an ARM...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Radar Wind Profiler (RWP) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    The Department of Energy/Atmospheric Radiation Measurement (DOE/ARM) program operated a radiosonde system on-board the RSV Aurora Australis as part of the Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean (MARCUS) field campaign....
    • SOCRATES
    final 1.0
    2018-10-05
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Stabilized Platform (S-TABLE) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Total Sky Imager (TSI) data in the DOE ARM Data Archive. You must have an ARM Archive account to access the data.
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Ultra-High Sensitivity Aerosol Spectrometer (UHSAS) data in the DOE ARM Data Archive. You must have an ARM Archive...
    • SOCRATES
    final completed
    This dataset contains a link to the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) RSV Aurora Australis Waveband Integrated Bioaerosol Sensor mark 4 (WIBS4) campaign data in the DOE ARM Data Archive. You must have an...
    • SOCRATES
    final completed
    A link is provided to the Fisheries and Oceans Canada Marine Environmental Data Section (MEDS) datasets which includes buoy, float and other marine data sets.
    • PACS
    final completed
    This dataset contains data and documentation on the agreed-upon marine region boundaries for the Bering Sea Project study area. These data are intended to facilitate analysis and collaboration between researchers who are working on different parts of...
    • BSIERP
    1.0
    2012-03-12
    This data set contains atmospheric profiles derived from rawinsondes released from Mariscal Estigarribia, Paraguay during the South American Low-Level Jet Experiment (SALLJEX) from 24 November 2002 thru 03 February 2003. Rawinsondes were generally...
    • SALLJEX
    final 1.0
    2011-08-24
    This data set contains marsupial tracking 3-day forecast imagery based on the ECMWF model. Marsupial tracking is a real-time experimental forecast product to track the wave pouch and predict the tropical cyclogenesis location using global operational...
    • T-PARC
    final 1.0
    2009-02-02
    This data set contains marsupial tracking 3-day forecast imagery based on the NCEP GFS model. Marsupial tracking is a real-time experimental forecast product to track the wave pouch and predict the tropical cyclogenesis location using global...
    • T-PARC
    final 1.0
    2009-01-29
    This data set contains marsupial tracking 3-day forecast imagery based on the NOGAPS model. Marsupial tracking is a real-time experimental forecast product to track the wave pouch and predict the tropical cyclogenesis location using global operational...
    • T-PARC
    final 1.0
    2009-01-29
    This dataset contains gif images from the Martinique Radar taken during the Ice in Clouds Experiment - Tropical (ICE-T) project.
    • ICE-T
    final 1.0
    2011-10-18
    This dataset contains a link to information on ordering the Mass Size Distribution (MSD) Data from the French National Centre for Scientific Research.
    • HAIC-HIWC
    final completed
    This dataset contains a link to information on ordering the Mass Size Distribution (MSD) Data from the French National Centre for Scientific Research.
    • HAIC-HIWC_2015
    final completed
    NCAR MATCH Model Regional Grids for the INDOEX project are included in this dataset. The NCAR/CGD aerosol assimilation system consists of the Model of Atmospheric Transport and Chemistry (MATCH) combined with an assimilation package developed for...
    • INDOEX
    final completed
    This dataset contains information from the Evernote notebooks from the Mountain Terrain Atmospheric Modeling and Observations Field Experimental Component (MATERHORN-X) project that were compiled during the project. There are three Evernote notebooks...
    • MATERHORN-X
    final 1.0
    2017-09-21
    This dataset contains a general set of photographs from the MATERHORN-X project. Included in this dataset are photos from the East, West, Southwest, and Northwest Granite Mountain sites plus the Sage Brush, Big Gap, Small Gap sites. Some instrument...
    • MATERHORN-X
    final 1.0
    2017-08-11
    This dataset contains flux tower and extensive energy balance data collected at all tower sites for the Mountain Terrain Atmospheric Modeling and Observations (MATERHORN-X) project. The data are raw and in comma delimited ASCII files. The time stamp is...
    • MATERHORN-X
    final 1.0
    2017-09-01
    This dataset contains Atmospheric Radon measurements made during ACE-ASIA at the surface site at the Mauna Loa Observatory, Hawaii.
    • ACE-ASIA
    final 1.0
    2002-12-19
    This dataset contains stream flow data from Mauze Gulch on the Seward Peninsula in Alaska. The stream discharge was monitored several times a day during snowmelt and periodically after snowmelt until late summer by taking individual measurements using...
    • ATLAS
    1.0
    2007-11-05
    This dataset contains stream flow data from Mauze Gulch on the Seward Peninsula in Alaska. The stream discharge was monitored several times a day during snowmelt and periodically after snowmelt until late summer by taking individual measurements using...
    • ATLAS
    1.0
    2007-11-05
    This data set contains quicklook PPI and RHI reflectivity imagery from the University of Alabama-Huntsville MAX radar during the PLOWS field seasons. Imagery are available for PLOWS IOPs 1, 2, 4, 5, 7, 8, 9, 10, 13, 14, 17, 19, 21 and 23. The imagery...
    • PLOWS
    final 1.0
    2010-12-14
    This data set contains quicklook imagery from the University of Alabama-Huntsville MAX radar during PLOWS 2009-2010. The products include PPI and RHI plots of RhoHV Correlation Coefficient, Total Power, Mean Velocity, Reflectivity, and Differential...
    • PLOWS
    final 1.0
    2010-04-14
    A link to the DC3 Field Catalog Reports section which includes science logs from the UAH MAX radar.
    • DC3
    final completed
    This data set contains universal format data from the University of Alabama-Huntsville MAX radar during the PLOWS field seasons. Data are available for PLOWS IOPs 1, 2, 4, 5, 7, 8, 9, 10, 13, 14, 17, 19, 21 and 23. The data were provided by the...
    • PLOWS
    final 1.0
    2011-05-17
    This data set contains surface meteorological data collected coincident with the University of Alabama-Huntsville MAX radar during the PLOWS field seasons. Two different instrumentation setups were utilized as described in the readme files. The...
    • PLOWS
    final 1.0
    2010-10-20
    This dataset contains a link to the DOE ARM Archive DOE G-1 PCASP and CAPS Liquid Water Content and N Data from the 2006 MAX-Mex (Megacities Aerosol Experiment-Mexico) campaign. You must have an ARM Archive account to access these data.
    • MILAGRO
    final completed
    This data set is a single tar file containing cmf text files of PAM-II station data from the May Polarization Experiment 1984.
    • MAYPOLE84
    final 1.0
    2014-06-13
    This dataset consists of mpg files from video tape (VHS) from each flight of the NCAR King-Air aircraft during the May Polarization Experiment 1984 (MAYPOLE84). This dataset contains forward-looking videos that have radar inset within the video. Only...
    • MAYPOLE84
    final 1.0
    2013-01-31
    This dataset consists of mpg files from video tape (VHS) from each flight of the NCAR King-Air aircraft during the May Polarization Experiment (MAYPOLE). This dataset contains forward-looking videos that have radar inset within the video. Only videos...
    • MAYPOLE
    final 1.0
    2013-01-31
    This data set contains data from the NOAA Missouri Basin River Forecast Center (MBRFC). The MBRFC routinely ingests WSR-88D precipitation derived products (Level III) from each of the radar sites with coverage in the Missouri River Basin. In addition...
    • GCIP/LSA-NW-99
    final 1.0
    2011-09-14
    This data set contains data from the NOAA Missouri Basin River Forecast Center (MBRFC). The MBRFC routinely ingests WSR-88D precipitation derived products (Level III) from each of the radar sites with coverage in the Missouri River Basin. In addition...
    • GCIP/LSA-NW-00
    final 1.0
    2011-09-14
    This data set contains data from the NOAA Missouri Basin River Forecast Center (MBRFC). The MBRFC routinely ingests WSR-88D precipitation derived products (Level III) from each of the radar sites with coverage in the Missouri River Basin. In addition...
    • GCIP/LSA-NW-99
    final 1.0
    2011-09-14
    This data set contains data from the NOAA Missouri Basin River Forecast Center (MBRFC). The MBRFC routinely ingests WSR-88D precipitation derived products (Level III) from each of the radar sites with coverage in the Missouri River Basin. In addition...
    • GCIP/LSA-NW-00
    final 1.0
    2011-09-14
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset contains MCCM forecast product model imagery from UNAM collected during the MILAGRO field project.
    • MILAGRO
    final 1.0
    2008-10-07
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    The McGill Radar Observatory operates 2 vertically pointing X-band radars (VertiX) at 2 sites on the island of Montreal. The vertically pointing X-band radars can detect all precipitation targets and some ice clouds. They can also measure the Doppler...
    • WINTRE-MIX
    final 1.0
    2022-11-16
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    A link to the NCAR/ACOM MILAGRO Data Archive MCMA 2006 High Res. TOF-AMS; Optical Particle Counter data
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    A link to the NCAR/ACOM MILAGRO Data Archive MCMA 2006 Tandem Differential Mobility Analyzer, Aerosol Polarimetery Sensor, CCN Separator data
    • MILAGRO
    final completed
    A link to the NCAR/ACOM MILAGRO Data Archive MCMA 2006 Tethered Balloon; Ozonesondes and VOC profiles; Metsondes Data
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    A link to the NCAR/ACOM MILAGRO Data Archive MCMA 2006 T0 Instituto Mexicano del Petroleo (T0-IMP) site Two Long Path-DOAS; Multi-Axes DOAS; Spectroradiometer data
    • MILAGRO
    final completed
    This dataset contains the Coordinated Energy and Water Cycle Observation Project (CEOP) Enhanced Observing Period 3 and Enhanced Observing Period 4 (EOP-3 and EOP-4) Murray-Darling Basin (MDB) Murrumbidgee Soil Temperature and Soil Moisture Data Set.....
    • CEOP/EOP-4
    • CEOP/EOP-3
    • CEOP
    final 1.0
    2011-06-17
    This data set contains the Coordinated Energy and Water Cycle Observation Project (CEOP) Enhanced Observing Period 3 and Enhanced Observing Period 4 (EOP-3 and EOP-4) Murray-Darling Basin (MDB) Murrumbidgee 30 Minute Surface Meteorology and Radiation...
    • CEOP/EOP-4
    • CEOP/EOP-3
    • CEOP
    final 1.0
    2011-06-17
    This dataset contains the Coordinated Energy and Water Cycle Observation Project (CEOP) Enhanced Observing Period 3 and Enhanced Observing Period 4 (EOP-3 and EOP-4) Murray-Darling Basin (MDB) Tumbarumba Flux Data Set. This dataset contains data from...
    • CEOP/EOP-4
    • CEOP/EOP-3
    • CEOP
    final 1.0
    2011-06-17
    This dataset contains measurements at the Kap Hoegh, Greenland little auk colony in 2007. These data are chick growth measurements, productivity and attendance, morphometric measurements of adults used in different studies including time depth recorder...
    • ARCSS
    • ACADIS
    1.0
    2012-03-20
    This dataset links to supplemental information for the project.
    • START08
    final completed
    This dataset contains stream flow data from Melsing Creek on the Seward Peninsula in Alaska. The stream discharge was monitored several times a day during snowmelt and periodically after snowmelt until late summer by taking individual measurements...
    • ATLAS
    1.0
    2007-11-05
    This dataset contains stream flow data from Melsing Creek on the Seward Peninsula in Alaska. The stream discharge was monitored several times a day during snowmelt and periodically after snowmelt until late summer by taking individual measurements...
    • ATLAS
    1.0
    2007-11-05
    This dataset contains the Saudi Meteorological and Environmental Protection Administration (MEPA) surface data. Files are in ASCII format. The first 3 letters in each filename indicate location, which is followed by month and year.
    • KOFSE
    final 1.0
    2018-11-05
    This dataset consists of 1-minute merged data from the 19 research flights with the C-130 over the Southeast U.S. between June 1 and July 15, 2013, as part of the Southeast Atmosphere Study (SAS). Merged data files have been created, combining all...
    • SAS
    final 1.0
    2016-07-27
    This dataset consists of 1-second merged data from the 19 research flights with the C-130 over the Southeast U.S. between June 1 and July 15, 2013, as part of the Southeast Atmosphere Study (SAS). Merged data files have been created, combining all...
    • SAS
    final 1.0
    2016-07-25
    This dataset contains netCDF data files that hold selected variables from the NCAR Gulfstream V (GV) aircraft, instrument observations, and large-scale meteorological variables interpolated in space and time from the high-resolution NCEP Global...
    • START08
    final 1.0
    2013-04-08
    This dataset contains netCDF data files that hold selected variables from the NCAR Gulfstream V (GV) aircraft and large-scale meteorological variables interpolated in space and time from the high-resolution NCEP Global Forecast System (GFS) 6-hourly...
    • START08
    final 1.0
    2011-09-14
    This dataset contains the 30-sec averaged CO data and the NCAR can sample analysis results collected during the first Stratospheric-Tropospheric Experiment: Radiation, Aerosols, and Ozone (STERAO).  Data were collected from 26 June 1996 to 16 July 1996...
    • STERAO-A
    final 1.0
    2018-11-20
    This dataset links to supplemental information for the project.
    • DYNAMO
    final completed
    This dataset contains output from the National Center for Atmospheric Research/Penn State University Mesoscale Model 5 (NCAR/PSU MM5). The data are for the NAME Model Assessment Project (NAMAP). NCAR/EOL has performed no Quality Control on this dataset...
    • NAMAP
    final 1.0
    2008-05-29
    A link to the MesoWest website. MesoWest is a cooperative project started at the University of Utah in 1996, with a goal of providing access to current and archived weather observations across the United States through web-based resources.
    • DC3
    • VORTEX2
    • IDEAL
    final completed

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    This material is based upon work supported by the NSF National Center for Atmospheric Research, a major facility sponsored by the U.S. National Science Foundation and managed by the University Corporation for Atmospheric Research. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the U.S. National Science Foundation.