Skip to data content Skip to data search
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.
    Max results:
    Dataset Projects Responsible parties Version/Date
    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
    • CEOP/EOP-3
    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
    • CEOP/EOP-3
    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
    • CEOP/EOP-3
    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.
    • IDEAL
    • VORTEX2
    • DC3
    final completed
    This dataset links to supplemental information for the project.
    • IDEAL
    final completed
    This data set contains mesozooplankton biomass and abundance from net tows conducted during the SHEBA drift experiment. Two data sets are archived. The first, SHEBA_ALLTAXA.xls, presents total displacement volume biomass as both dry weight (mg dw m-3)...
    • SHEBA
    1.0
    2007-11-02
    In order to contribute to the assessment of the state and variability of the species composition, abundance and biomass of the populations forming the ecosystem of the Eastern Bering Sea Shelf and to estimate population trends, approximately 860...
    • BEST
    preliminary 1.0
    2011-06-21
    In order to contribute to the assessment of the state and variability of the species composition, abundance and biomass of the populations forming the ecosystem of the Eastern Bering Sea Shelf and to estimate population trends, approximately 860...
    • BEST
    preliminary 1.0
    2011-06-21
    This data represents the Metal content of the Piston Core sample P-1 taken at P1-92-AR.
    • SBI
    1.0
    2007-11-05
    This data represents the Metal content of the Piston Core sample P-1 taken at P1-92-AR.
    • SBI
    1.0
    2007-11-05
    This dataset includes imagery from the Global Telecommunications System (GTS) Surface Observations taken during the T-REX field project. These hourly National Weather Service (NWS) station plots include images of the entire T-REX region in California,...
    • T-REX
    final 1.0
    2008-10-07
    This dataset contains 30 second ISFS data from the Meteor Crater Experiment (METCRAX), from 24 September 2006 to 4 November 2006. These data are in NetCDF format, have been tilt corrected, and are in geographic coordinates. More information about the...
    • METCRAX
    final 1.0
    2007-09-05
    This dataset contains 30 second ISFS data from the Meteor Crater Experiment (METCRAX), from 24 September 2006 to 4 November 2006. These data are in NetCDF format, are not tilt corrected, and are in geographic coordinates. More information about the...
    • METCRAX
    final 1.0
    2007-09-05
    This dataset contains 5 minute ISFS data from the Meteor Crater Experiment (METCRAX), from 24 September 2006 to 4 November 2006. These data are in NetCDF format, have been tilt corrected, and are in geographic coordinates. More information about the...
    • METCRAX
    final 1.0
    2007-08-28
    The Meteor Crater Experiment (METCRAX) is a 3-year meteorological research program supported by the Mesoscale Dynamics Division of the U. S. National Science Foundation (NSF). The program is investigating the structure and evolution of temperature...
    • METCRAX
    final 1.0
    2016-06-06
    The Meteor Crater Experiment (METCRAX) is a 3-year meteorological research program supported by the Mesoscale Dynamics Division of the U. S. National Science Foundation (NSF). The program is investigating the structure and evolution of temperature...
    • METCRAX
    final 1.0
    2016-06-02
    The Meteor Crater Experiment (METCRAX) is a 3-year meteorological research program supported by the Mesoscale Dynamics Division of the U. S. National Science Foundation (NSF). The program is investigating the structure and evolution of temperature...
    • METCRAX
    final 1.0
    2016-06-06
    The Meteor Crater Experiment (METCRAX) is a 3-year meteorological research program whose purpose is to investigate the structure and evolution of temperature inversions or cold-air pools that form on a daily basis in topographic basins and valleys. For...
    • METCRAX
    final 1.0
    2016-01-26
    These are 30 minute flux files for METCRAXII. They are week-long files, with a starting date (UTC) indicated in the file name.
    • METCRAX-II
    final 1.0
    2014-08-19
    This dataset contains 30 second ISFS data collected from 27 September to 2 November 2013 as part of the Meteor Crater Experiment II (METCRAX-II). These data are in NetCDF format. This is the release of the 30 second, not tilt corrected ISFS dataset.
    • METCRAX-II
    final 1.0
    2014-08-12
    This dataset contains 30 second ISFS data collected from 27 September to 2 November 2013 as part of the Meteor Crater Experiment II (METCRAX-II). These data are in NetCDF format. This is the "final" release of the 30 second, tilt corrected ISFS dataset.
    • METCRAX-II
    final 1.0
    2014-03-18
    This dataset contains 5 minute ISFS data collected from 27 September to 2 November 2013 as part of the Meteor Crater Experiment II (METCRAX-II). These data are in NetCDF format and have not been tilt corrected.
    • METCRAX-II
    final 1.0
    2014-08-14
    This dataset contains 5 minute ISFS data collected from 27 September to 2 November 2013 as part of the Meteor Crater Experiment II (METCRAX-II). These data are in NetCDF format, and have been tilt corrected.
    • METCRAX-II
    final 1.0
    2014-03-18
    This dataset contains high rate (5 second) ISFS data collected from 27 September to 2 November 2013 as part of the Meteor Crater Experiment II (METCRAX-II). These data are in NetCDF format, and have not been tilt corrected.
    • METCRAX-II
    final 1.0
    2014-08-29
    This dataset contains high rate, 5 second, ISFS data collected from 27 September to 2 November 2013 as part of the Meteor Crater Experiment II (METCRAX-II). These data are in NetCDF format, and have been tilt corrected.
    • METCRAX-II
    final 1.0
    2014-08-25
    This dataset contains all sky imagery every minute from the Integrated Sounding System (ISS) All Sky Camera during the Meteor Crater Experiment II (METCRAX-II). These data are in daily tarred files, including both raw and panoramic images, and were...
    • METCRAX-II
    final 1.0
    2016-06-22
    This data set contains Doppler LIDAR moment data collected by the EOL Integrated Sounding Systems (ISS) during the Meteor Crater Experiment II (METCRAX-II) from 30 September 2013 to 30 October 2013. The data are gzipped ascii text files and are...
    • METCRAX-II
    final 1.0
    2016-08-23
    This dataset contains Ceilometer data collected by the NCAR/EOL Integrated Sounding System (ISS) during the Meteor Crater Experiment II (METCRAX-II) between 21 September 2013 and 29 October 2013. These data are in daily tar files containing raw ASCII...
    • METCRAX-II
    final 1.0
    2016-06-02
    This dataset contains Sonic Detection And Ranging (SODAR) data collected by the NCAR/EOL Integrated Sounding System (ISS) during the Meteor Crater Experiment II (METCRAX-II) between 24 September 2013 and 29 October 2013. This dataset contains raw SODAR...
    • METCRAX-II
    final 1.0
    2016-06-02
    METCRAX-II was the second experiment studying the atmospheric boundary layer of the Arizona Meteor Crater. METCRAX-II investigated downslope-windstorm-type flows that develop when thermally-driven drainage flows cascade over the rim of the Arizona...
    • METCRAX-II
    final 1.0
    2016-06-01
    METCRAX-II was the second experiment studying the atmospheric boundary layer of the Arizona Meteor Crater. METCRAX-II investigated downslope-windstorm-type flows that develop when thermally-driven drainage flows cascade over the rim of the Arizona...
    • METCRAX-II
    final 1.0
    2016-06-01
    This data set contains Meteorogram imagery from the NAME Field Catalog. The following imagery products are included: Blyth_CA, Casa_Grande_AZ, Deming_NM, Douglas_AZ, El_Paso_TX, Imperial_CA, Kingman_AZ, Las_Vegas_NV, Nogales_AZ, Palm_Springs_CA,...
    • NAME
    final 1.0
    2008-10-07
    These 16 mm films include footage of the sky from the US ship Meteor for Phases I, II, and III of the Global Atmospheric Research Program's (GARP) Atlantic Tropical Experiment (GATE).
    • GATE
    final 1.0
    2017-11-13
    This data set contains a subset of observations made using the Buckland Park meteor wind radar that are of potential interest to Deep Propagating Gravity Wave Experiment over New Zealand (DEEPWAVE) investigators. They nominally cover the interval 1 May...
    • DEEPWAVE
    final 1.0
    2015-04-24
    These data are a subset of observations made using the Davis meteor wind radar that are of potential interest to Deep Propagating Gravity Wave Experiment over New Zealand (DEEPWAVE) investigators. They nominally cover the interval 1 May to 31 August 20...
    • DEEPWAVE
    final 1.0
    2015-04-28
    These data are a subset of observations made using the Kingston meteor wind radar that are of potential interest to Deep Propagating Gravity Wave Experiment over New Zealand (DEEPWAVE) investigators. They nominally cover the interval 1 May to 31 August...
    • DEEPWAVE
    final 1.0
    2015-04-28
    The data files in this data set contain climate and hydrographic information from sites on the North Slope of Alaska. The variables collected were temperature, humidity, wind speed and direction, soil heat flux and temperature, snow temperature,...
    • ARCSS
    1.0
    2010-05-18
    This dataset contains Meteorological and Navigation (Met/Nav) data collected on the NASA DC-8 aircraft from the High Ice Water Content (HIWC) Radar Study project that took place in Fort Lauderdale, Florida; Palmdale, California; and Kona, Hawaii. The...
    • HIWC-RADAR-2018
    final 1.0
    2019-01-08
    This data set includes meteorological and radio brightness observations of tundra and shrub terrain on the North Slope of Alaska, USA near Toolik Lake. These data are nearly continuous from 8 May through 2 July 2004; the ground surface ranged from snow...
    • ARCSS
    1.0
    2009-04-29
    The data files from the sUAS consist of either vertical profiles up to 700 feet (213 m) above ground level (AGL) or hovers at fixed altitudes for 10-15 minutes using the Meteomatics Severe Storms Edition (SSE) small unmanned aircraft system (sUAS)....
    • CHEESEHEAD
    final 1.0
    2019-11-11
    This dataset contains Meteorological Measurement System (MMS) data collected on the NASA DC-8 aircraft from the High Ice Water Content (HIWC) Radar Study project that took place in Fort Lauderdale, Florida; Palmdale, California; and Kona, Hawaii. The...
    • HIWC-RADAR-2018
    final 1.0
    2019-03-14
    This dataset provides a link to the NASA ESPO Data Archive for the ATTREX Global Hawk campaign. Included are the Meteorological Measurement System (MMS) Data
    • CONTRAST
    final completed
    Data from the Meteorological Measurement System (MMS) that was flown on the NASA WB-57 aircraft for the ACCLIP deployment. MMS provides basic meteorological and aircraft parameters at 1 and 20 Hz resolution. The ACCLIP flights were based out of Osan...
    • ACCLIP
    preliminary
    The Upper Missouri River Basin Pilot Project (UMRBPP) Meteorological Tower Data Set contains 15-min mean observations of wind speed (at 60 and 100 feet), wind direction (at 100 feet), and temperature, relative humidity, and pressure (at the tower base)...
    • UMRBPP
    • GCIP/LSA-NW-99
    final 1.0
    2006-06-12
    This data set contains meteorological, radiation, soil, and snow data from sites in Ivotuk and the Seward Peninsula in Alaska. The goal of the project is to improve the understanding of the role that soil moisture and surface temperature play in...
    • ARCSS
    1.0
    2009-09-17
    A measurement intensive campaign was carried out in Barrow, Alaska in spring 2009 as part of the Ocean Atmosphere Sea Ice Snowpack (OASIS) program. This dataset contains three-dimensional wind velocities measured at 2 heights (~ 2 m agl and 6 m agl)...
    • ARCSS
    • ACADIS
    1.0
    2012-01-04
    This dataset links to supplemental information for the project.
    • SALLJEX
    final completed
    This dataset includes temperature, relative humidity, long- and short-wave radiation, photosynthetically active radiation (PAR), leaf area index (LAI), microtopography, and thaw depth data for study sites on the North Slope of Alaska. Meteorological...
    • ARCSS
    1.0
    2009-04-29
    This dataset links to supplemental information for the project.
    • INDOEX
    final completed
    This dataset consists of jpeg images of Meteosat 9 products from the PRE-Depression Investigation of Cloud-systems in the Tropics (PREDICT) project. The data includes Visible SWIR, channel 1, channel 1 visible, Channel 5 water vapor, and Channel 9...
    • PREDICT
    final 1.0
    2021-09-30
    This dataset links to supplemental information for the project.
    • DYNAMO
    final completed
    This dataset provides a link to the EUMETSAT Data Delivery website
    • HIGHWAY
    final completed
    Meteosat-5 data in TDF format for the INDOEX campaign.
    • INDOEX
    final completed
    This data set contains the Meteosat-5 IR, visible, and water vapor satellite imagery. Please be aware that there are no images for the time period between 1999/01/02 and 1999/01/20. No additional quality control was performed by UCAR/JOSS.
    • INDOEX
    final 1.0
    2005-10-25
    This data set contains atmospheric motion vector data derived from Meteosat-7 visible, infrared, and water vapor data. The data covers the Indian Ocean region and includes winds from all vertical levels and over both ocean and land. The data are in a...
    • DYNAMO
    final 1.0
    2012-10-03
    This data set contains Meteosat-7 Atmospheric Motion Vector imagery over the DYNAMO region. Products include low level convergence, upper level divergence, low level and upper level winds, 850 mb vorticity, wind shear, and wind shear tendency. The...
    • DYNAMO
    final 1.0
    2012-11-01
    This data set contains 5 km resolution Meteosat-7 Infrared (channel 8) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the NetCDF file format. These data are the calibrated temperature values.
    • DYNAMO
    final 1.0
    2012-08-09
    This data set contains 5 km resolution Meteosat-7 Infrared (channel 8) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the McIDAS AREA file format.
    • DYNAMO
    final 1.0
    2012-08-09
    This data set contains 5 km resolution Meteosat-7 Infrared (channel 8) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the NetCDF file format. These data are the raw uncalibrated units and are provided if you...
    • DYNAMO
    final 1.0
    2012-08-23
    This data set contains 2.5 km resolution Meteosat-7 visible (channel 1) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the NetCDF file format. These data are the calibrated brightness values.
    • DYNAMO
    final 1.0
    2012-08-09
    This data set contains 2.5 km resolution Meteosat-7 visible (channel 1) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the McIDAS AREA file format.
    • DYNAMO
    final 1.0
    2012-08-09
    This data set contains 2.5 km resolution Meteosat-7 visible (channel 1) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the NetCDF file format. These data are the raw uncalibrated units and are provided if...
    • DYNAMO
    final 1.0
    2012-08-23
    This data set contains 5 km resolution Meteosat-7 Water Vapor (channel 10) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the NetCDF file format. These data are the calibrated temperature values.
    • DYNAMO
    final 1.0
    2012-08-09
    This data set contains 5 km resolution Meteosat-7 Water Vapor (channel 10) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the McIDAS AREA file format.
    • DYNAMO
    final 1.0
    2012-08-09
    This data set contains 5 km resolution Meteosat-7 Water Vapor (channel 10) satellite data over the DYNAMO region. Data are available at 30 minute intervals and are in the NetCDF file format. These data are the raw uncalibrated units and are provided if...
    • DYNAMO
    final 1.0
    2012-08-23
    This dataset contains full resolution meteosat-9 data collected during the PREDICT project. The University of Wisconsin Space Science and Engineering Center (SSEC) made available the full resolution METEOSAT-9 imager data to the PREDICT investigators....
    • PREDICT
    final 1.0
    2021-09-29
    This dataset contains full resolution meteosat-9 data collected during the PREDICT project. The University of Wisconsin Space Science and Engineering Center (SSEC) made available the full resolution METEOSAT-9 imager data to the PREDICT investigators....
    • PREDICT
    final 1.0
    2021-09-29
    This data set contains Meteosat-7 visible (channel 1) imagery over the DYNAMO region. These images were developed by NCAR/EOL and are in jpg format.
    • DYNAMO
    final 1.0
    2012-11-01
    This data set contains Meteosat-7 water vapor (channel 10) imagery over the DYNAMO region. These images were developed by NCAR/EOL and are in jpg format.
    • DYNAMO
    final 1.0
    2012-11-01
    This data set contains Meteosat-7 thermal IR (channel 8) imagery over the DYNAMO region. These images were developed by NCAR/EOL and are in jpg format.
    • DYNAMO
    final 1.0
    2012-11-01
    This dataset contains ebullition flux measurements from thermokarst lakes in Siberia and Alaska. Data were collected using submerged bubble traps placed over discrete ebullition seeps. Ebullition values are reported volumetrically (mg CH4 per seep per...
    • ARCSS
    • ACADIS
    completed
    This dataset contains methane fluxes, along with air and soil temperatures, collected at Happy Valley and Toolik Lake Arctic System Science/Land-Atmosphere Ice Interaction (ARCSS/LAII) study sites during the summers of 1994 and 1995. The data were...
    • ARCSS
    1.0
    2009-04-29
    This data set contains CH4 (methane) flux and related measurements taken at the Happy Valley Flux Study Site in northern Alaska during the summer of 1994. Sampling was conducted to test use of a laser sensor on a portable eddy correlation tower by...
    • ARCSS
    1.0
    2009-04-29
    This dataset contains the scrubbed chat logs from the MethaneAIR project from 8 November 2019 - 17 August 2021. These chat logs contain conversations between scientists and other project participants collected during the field phase of the MethaneAIR...
    • MethaneAIR
    final 1.0
    2021-09-22
    This dataset links to supplemental information for the project.
    • DYNAMO
    final completed
    This dataset contains Conductivity-Temperature-Depth (CTD) data for the NAME cruises of the CICESE Research Vessel (R/V) Francisco de Ulloa in the Gulf of California. The cruise lasted from 5 June to 18 June 2004 and 7 July to 20 July 2004. There are 3...
    • NAME
    final 1.0
    2006-06-14
    This is one of the upper air data sets developed for the North American Monsoon Experiment (NAME). This data set includes the high resolution (2 second) rawinsonde data from the Centro de Investigación Científica y de Educatción Superior de Ensenada ...
    • NAME
    final 1.0
    2011-08-24
    This data set contains atmospheric measurements and data obtained during a cruise of the R/V Francisco de Ulloa in the Gulf of California. These measurements were part of the North American Monsoon Experiment (NAME). The first leg of the cruise...
    • NAME
    final 1.0
    2007-10-25
    This data set contains daily precipitation data from across Mexico. The data are from 1348 sites within Mexico covering the time period January 1989 to April 1999. In Version 2 of this dataset, the observation hours have all been set to missing or "99"...
    • PACS
    final 2.0
    2021-10-12
    This dataset contains rain gage data supported by the Mexican Meteorological Service (Servicio Meteorologico Nacional, SMN), the Mexican Water Commission (Comision Nacional de Agua, CNA) or local county and state government agencies (Delegaciones)....
    • NAME
    final 1.0
    2007-10-25
    This dataset links to supplemental information for the project.
    • MILAGRO
    final completed
    This dataset provides a link to an excel spreadsheet containing Mexican Navy Coastal Surface Locations (EMAS) at the NCAR/ACOM MILAGRO Data Archive.
    • MILAGRO
    final completed

    © 2025 UCAR | EOL | Privacy | Email: datahelp@eol.ucar.edu

    NSF

    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.