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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 data set includes soil moisture measurements from Inyo County during the Terrain-Induced Rotor Experiment (T-REX) period.The data are volumetric soil water content by depth for each access tube at each monitoring site.
    • T-REX
    final 1.0
    2008-10-07
    A link to the NASA INTEX-B archive of ozonesonde data collected by Anne Thompson during the campaign.
    • MILAGRO
    final completed
    The Stable Atmospheric Variability and Transport, or SAVANT field project was held near Mahomet, Illinois and ran from 15 September 2018 to 15 November 2018. This project was executed by a team of researchers from the University of South Carolina and...
    • SAVANT
    final 1.0
    2022-09-09
    The Ambient Air Quality division of the State Hygienic Laboratory at the University of Iowa works in conjunction with the Iowa Department of Natural Resources and the Environmental Protection Agency to preserve the air quality of the state. The State...
    • VORTEX2
    final completed
    This data set contains 1-minute resolution surface meteorological data from the 41 Automated Weather Observing System (AWOS) stations located in the state of Iowa. These data were retrieved from the Iowa Environmental Mesonet for the PLOWS field phases...
    • PLOWS
    final 1.0
    2010-04-23
    The Iowa DOT collected 1 min resolution data for the Iowa AWOS stations. Data has undergone QC. The data consists oftemperature, dewpoint, altimeter, barometric pressure, wind speed/direction, sky conditions, visibility, density altitude and...
    • STORM-FEST
    final 1.0
    2011-08-24
    A link to the ISU Iowa Environmental Mesonet website. The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. Networks included are ASOS, AWOS, CoCoRAHS, NWS cooperative observer, DCP, ISU Soil...
    • VORTEX2
    final completed
    This dataset contains Iowa Environmental Mesonet Imagery from the Bow Echo and Mesoscale Convective Vortex (BAMEX) Project.
    • BAMEX
    final 1.0
    2008-10-07
    This data set contains hourly resolution surface meteorological data from the Iowa Environmental Mesonet. These data are made available through Iowa State University and include data for locations throughout the state of Iowa from a variety of networks...
    • SMEX02
    final 1.0
    2007-10-23
    This data set contains hourly surface weather maps over the state of Iowa. They include observations from the Iowa Mesonet. The maps were generated by Iowa State University. This data set contains imagery from the two PLOWS field phases, 22 January to ...
    • PLOWS
    final 1.0
    2010-03-24
    This data set contains 20-minute resolution surface meteorological data from the Iowa Roadway Weather Information System (RWIS) stations located across Iowa. This data set covers the period from 1 May through 31 August 2003. The data are in ASCII format.
    • BAMEX
    final 1.0
    2008-10-07
    During the VAMOS Ocean-Cloud Atmosphere-Land Study (VOCALS) campaign, an NCAR/EOL GPS Advanced Upper-Air Sounding (GAUS) system was deployed. This dataset is from the system located in Iquique, Chile, and the data collection was done from October 6 to...
    • VOCALS
    final 1.0
    2011-01-19
    This dataset contains data from the NCAR GPS Advanced Upper-Air Sounding System (GAUS) station located at Iquique, Chile for the VAMOS Ocean-Cloud Atmosphere-Land Study (VOCALS) campaign. The variables pressure, temperature, and relative humidity are...
    • VOCALS
    final 1.0
    2009-06-25
    This dataset provides a link to the VOCALS Field Catalog Reports section which includes Iquique GAUS status reports.
    • VOCALS
    final completed
    The International Satellite Cloud Climatology Project (ISCCP) Cloud and Radiative Flux dataset is a subset of the ISCCP FDX-P2 Sheba Flux Data regridded into a 50km Equal-Area Scalable Earth Grid (EASE-Grid). It contains surface and top-of-atmosphere...
    • ARC-MIP
    final 1.0
    2010-02-02
    THIS DATASET HAS BEEN REPLACED WITH VERSION 2.0 ISFS TOWER AND ARRAY HIGH RATE NETCDF DATA.  TO DOWNLOAD THE NEW DATASET GO TO: https://data.eol.ucar.edu/dataset/edit/129.005 ----------------------- This data set from the Integrated Surface Flux...
    • CHATS
    final 1.0
    2011-05-17
    THIS DATASET HAS BEEN REPLACED WITH VERSION 2.0 ISFS TOWER AND ARRAY HIGH RATE NETCDF DATA.  TO DOWNLOAD THE NEW DATASET GO TO: https://data.eol.ucar.edu/dataset/edit/129.005 ----------------------- This data set from the Integrated Surface Flux...
    • CHATS
    final 1.0
    2011-05-17
    5 minute surface meteorology data from the NCAR/EOL Integrated Surface Flux System (ISFS) collected during the Advection Horizontal Array Turbulence Study (AHATS). These data are in NetCDF format, and have been quality controlled. NOTE: sonic...
    • AHATS
    final 1.0
    2016-07-14
    Final version of the ISFS 5-minute statistics collected during the Advanced Technology Solar Telescope Site Survey (ATST) project are available in NetCDF. The wind data are in instrument coordinates; they have not been corrected for anemometer tilt or...
    • ATST
    final 1.0
    2023-06-14
    Supplemental data from the Integrated Surface Flux System (ISFS) Meteorological Stations. Data includes pressure, temperature, humidity, wind speed, and wind direction for the IHOP time period. Five stations are represented in this dataset. Four of the...
    • IHOP_2002
    final 1.0
    2008-10-07
    Surface meteorology and flux products, as well as webcam images collected by the EOL/Integrated Surface Flux System (ISFS) team during the Sublimation of Snow (SOS) experiment in Gothic, CO.  Version 2 (as of 2024-12-31) downloadable datasets: 5 minute...
    • SOS
    final 2.0
    2024-12-31
    ISFS towered surface meteorology and flux data collected during the Multi-point Monin-Obukhov similarity horizontal array turbulence study (M2HATS). 5-minute averages and high rate 1s quality controlled netCDF datasets are available for download. Refer...
    • M2HATS
    final 1.0
    2024-03-06
    Surface meteorology and flux products collected by the EOL/Integrated Surface Flux System team during the Sundowner Wind Experiment (SWEX) in Santa Barbara, CA. Data have been collected from 18 towered sites spread out over the leeward side of the...
    • SWEX
    final 1.0
    2023-02-03
    The Inhibition of Snowfall by Pollution Aerosols (ISPA) was the second phase of a field campaign with the primary objective to better quantify the amount of water in snow pack lost due to pollution aerosols. The first phase of ISPA took place in 2002....
    • ISPA-2007
    final 1.0
    2016-01-26
    The Inhibition of Snowfall by Pollution Aerosols (ISPA) was the third phase of a field campaign performed to better quantify the amount of water in snow pack lost due to pollution aerosols. The first and second phases of ISPA took place in 2002 and 200...
    • ISPA-2010
    final 1.0
    2016-01-27
    Vaisala C31 ceilometer data products collected by the EOL/Integrated Sounding System group during the Sundowner Wind EXperiment (SWEX)  field campaign in Santa Barbara, CA. The instrument was mounted on the ISS3 trailer located at the Sedgwick site....
    • SWEX
    final 1.0
    2023-03-14
    Vaisala C51 ceilometer data products collected by the EOL/Integrated Sounding System group during the Sundowner Wind EXperiment (SWEX)  field campaign in Santa Barbara, CA. The instrument was mounted on the ISS2 trailer located at the Rancho Alegre...
    • SWEX
    final 1.0
    2023-03-14
    Vaisala C61 ceilometer data products collected by the EOL/Integrated Sounding System group during the Sundowner Wind EXperiment (SWEX)  field campaign in Santa Barbara, CA. The instrument was mounted on the ISS1 trailer located in the Santa Barbara...
    • SWEX
    final 1.0
    2023-03-14
    This data set contains surface meteorology imagery from the Integrated Sounding System (ISS) Multiple Antenna Profiler Radar (MAPR) sites during T-REX. MAPR is an advanced wind profiler radar developed to make rapid wind measurements of the boundary...
    • T-REX
    final 1.0
    2008-10-07
    PurpleAir aerosol measurements collected by the EOL/Integrated Sounding System team during the Cold Fog Amongst Complex Terrain (CFACT) field campaign in Heber Valley, Utah. Three PurpleAir sensors were mounted at three sites (1) North Pivot, (2) Provo...
    • CFACT
    final 1.0
    2022-09-12
    PurpleAir aerosol data collected by the EOL/Integrated Sounding System team during the Sundowner Wind Experiment field campaign in Santa Barbara, CA. Data were collected at three sites: (1) Santa Barbara County Fire Department, (2) Rancho Alegre, and (...
    • SWEX
    final 1.0
    2023-03-14
    PurpleAir aerosol measurements collected during the Multi-point Monin-Obukhov similarity horizontal array turbulence study (M2HATS). Sensors were mounted on the 10m surface meteorology tower and on the ISFS array. 
    • M2HATS
    final 1.0
    2023-11-15
    449 MHz, 915 MHz Profiler winds and moments, and RASS virtual temperature collected by the EOL/Integrated Sounding System team during the M2HATS (Multi-point Monin-Obukhov similarity horizontal array turbulence study) field campaign in Tonopa, Nevada....
    • M2HATS
    final 1.0
    2024-07-19
    449 MHz and 915 MHz Profiler winds and moments collected by the EOL/Integrated Sounding System team during the Sundowner Wind Experiment (SWEX) field campaign in Santa Barbara, CA. 915 MHz Profilers operated at the Rancho Alegra and Sedgwick Preserve...
    • SWEX
    final 1.0
    2024-02-26
    Vaisala MW41 radiosonde profiles launched during the Multi-point Monin-Obukhov similarity Horizontal Array Turbulence Study (study). Descending profiles are included with *dsc* in the filename to distinguish from ascending profiles. 
    • M2HATS
    final 1.0
    2023-11-15
    Radiosonde profiles launched by staff from EOL's Integrated Sounding System and the University California, Santa Barbara during the Sundowner Wind Experiment (SWEX) field campaign in Santa Barbara, CA. Launches were made at the Rancho Alegre site. 
    • SWEX
    final 1.0
    2022-11-03
    Radiosonde profiles launched by staff from EOL's Integrated Sounding System and the University California, Santa Barbara during the Sundowner Wind Experiment (SWEX) field campaign in Santa Barbara, CA. Launches were made at the Sedgwick site. 
    • SWEX
    final 1.0
    2022-11-03
    This data set contains surface meteorology imagery from the Earth Observing Laboratory (EOL) Integrated Sounding System (ISS) sites during T-REX. The ISS is a self contained meteorological observing system consisting of a wind profiler radar,...
    • T-REX
    final 1.0
    2008-10-07
    Surface meteorology products collected by the EOL/Integrated Sounding System team during the Sundowner Wind Experiment field campaign in Santa Barbara, CA. Data were collected at three sites: ISS1=Santa Barbara County Fire Department, ISS2=Rancho...
    • SWEX
    final 1.0
    2023-03-14
    Surface Meteorology, Vaisala CL61 Ceilometer, PurpleAir aerosol data products and webcam imagary collected during the Multi-point Monin-Obukhov similarity horizontal array turbulence study (M2HATS). Surface meteorology sensors were mounted on a 3m and ...
    • M2HATS
    final 1.0
    2024-02-20
    Webcam photos collected by the EOL/Integrated Sounding System team during the Sundowner Wind Experiment field campaign in Santa Barbara, CA. Data were collected at three sites: (1) Santa Barbara County Fire Department, (2) Rancho Alegre, and (3)...
    • SWEX
    final 1.0
    2023-03-14
    Leosphere Windcube Lidar products collected by the EOL Integrated Sounding System team during the Sundowner Wind EXperiment (SWEX) field campaign in Santa Barbara, CA. All data for a given scan type (i.e. PPI, RHI, VER, and DBS) are available for order...
    • SWEX
    final 1.0
    2023-03-31
    Vaisala/Leosphere Windcube and Halo Lidar products collected by the EOL Integrated Sounding System team during the Multi-point Monin-Obukhov similarity horizontal array turbulence study (M2HATS) field campaign in Tonopah, Nevada, USA. These include...
    • M2HATS
    final 1.0
    2024-03-08
    This dataset contains webcam imagery every 15 minutes during daylight hours from the Integrated Sounding System 2 (ISS2) Web Camera, which was located in the Salt Lake Valley during PCAPS. These data are in daily tarred files and were collected and...
    • PCAPS
    final 1.0
    2016-03-25
    A link to the ISU Soil Moisture Network website. Iowa State University maintains a network of observation stations located primarily at the Research and Demonstration Farms, but also at cooperating locations. Data from this network dates back to 1986!...
    • DC3
    • VORTEX2
    final completed
    This dataset contains sounding data and images collected by Iowa State University during the ICICLE (In-Cloud ICing and Large-drop Experiment) field campaign from 26 January - 8 March 2019. Data were collected with the Qinetic Tactical Atmospheric...
    • ICICLE
    final 1.0
    2020-03-11
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITEX
    final completed
    This dataset links to supplemental information for the project.
    • ITOP
    final completed
    This dataset links to supplemental information for the project.
    • ITOP
    final completed
    This dataset links to supplemental information for the project.
    • ITOP
    final completed
    This dataset is a simulated end-of-winter snow-depth distribution from the Snow, Shrubs and Weather Group. It contains two files, an ASCII data file and a .pdf image of the data.
    • ATLAS
    1.0
    2007-11-05
    This dataset contains species names and their corresponding codes for the Ivotuk biomass dataset which contains aboveground biomass data collected in the four Ivotuk sites at approximately peak season biomass, summer 1998. The biomass was harvested in ...
    • ATLAS
    1.0
    2007-11-05
    This dataset contains species names and their corresponding codes for the Ivotuk biomass dataset which contains aboveground biomass data collected in the four Ivotuk sites at approximately peak season biomass, summer 1998. The biomass was harvested in ...
    • ATLAS
    1.0
    2007-11-05
    This dataset contains aboveground biomass data collected in the four Ivotuk sites at approximately peak season biomass, summer 1998. The biomass was harvested in 20X50 cm plots, with 10 to 12 replicates per site. The plant tissues were further...
    • ATLAS
    1.0
    2007-11-05
    This dataset contains aboveground biomass data collected in the four Ivotuk sites at approximately peak season biomass, summer 1998. The biomass was harvested in 20X50 cm plots, with 10 to 12 replicates per site. The plant tissues were further...
    • ATLAS
    1.0
    2007-11-05
    This dataset is a series of Advanced Very High Resolution Radiometer (AVHRR) images of the Ivotuk site from the Snow, Shrubs, and Weather Group. The images are from May 18, 1999 from five different channels of the AVHRR.
    • ATLAS
    1.0
    2007-11-05
    This dataset contains Normalized Difference Vegetation Index (NDVI), Leaf Area Index (LAI) and Phytomass data collected at the Ivotuk field site during the growing season of 1999. The worksheets within this Excel file contain Mean NDVI and LAI data,...
    • ATLAS
    1.0
    2007-11-02
    This is the Thawed Soil Depth Data collected at the Circumpolar Active Layer Monitoring (CALM) grid site in Ivotuk during 1999. An Excel version of this dataset is also available. NOTE: This dataset contains the data in ASCII format.
    • ATLAS
    1.0
    2007-11-02
    This is the Thawed Soil Depth Data collected at the Circumpolar Active Layer Monitoring (CALM) grid site in Ivotuk during 1999. An ASCII version of this dataset is also available. NOTE: This dataset contains the data in EXCEL format.
    • ATLAS
    1.0
    2007-11-02
    This dataset was collected in order to obtain a rough estimate of the amount of caribou scat that might be added to 3 different tundra types under study and to see if particular microtopographic positions and associated vegetation accumulated scat...
    • ITEX
    • ATLAS
    1.0
    2007-11-05
    This dataset includes climate data from the MAT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the MAT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the MNT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the MNT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the MOSS site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the MOSS site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the Shrub site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes climate data from the Shrub site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site...
    • ATLAS
    1.0
    2007-11-02
    A single flux tower was constructed by Jason Beringer and operated during the snowmelt period at Ivotuk by Matt Sturm. Data processing and analysis was undertaken by Jason Beringer. Climate data were collected by Larry Hinzman. Sensible, latent and CO2...
    • ATLAS
    1.0
    2007-11-02
    A single flux tower was constructed by Jason Beringer and operated during the snowmelt period at Ivotuk by Matt Sturm. Data processing and analysis was undertaken by Jason Beringer. Climate data were collected by Larry Hinzman. Sensible, latent and CO2...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the MAT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the MAT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the MNT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the MNT site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the MOSS site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the MOSS site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the Shrub site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes flux data from the Shrub site near Ivotuk gathered during the 1998 summer field season. Surface energy and trace gas exchange measurements were made at each of the Ivotuk sites using the eddy covariance technique. The MAT site was...
    • ATLAS
    1.0
    2007-11-02
    This dataset includes Leaf Area Index (LAI) measurements taken at peak biomass at the Ivotuk grid sites in 1998. For more information, see the readme file.
    • ATLAS
    1.0
    2007-11-02
    This dataset contains a grid description and photo for the Ivotuk 1 (MAT) grid on the Arctic Slope, Alaska. The data were collected on the grid in 1998.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains vegetation and microsite data from grid points on the Ivotuk 1 (MAT) Grid on the Arctic Slope, Alaska. The data were collected on the grid in 1998.
    • ATLAS
    1.0
    2011-09-14
    This is the Mean Normalized Difference Vegetation Index (NDVI) and Leaf Area Index (LAI) data taken from the Excel dataset "1999, Ivotuk Mean NDVI and LAI Data (EXCEL) (Epstein)" and translated into Tabular ASCII.
    • ATLAS
    1.0
    2007-11-02
    This dataset contains Meteorological Data taken from the Ivotuk site station Met1 during the ATLAS field project.
    • ATLAS
    1.0
    2007-11-05
    This dataset contains Meteorological Data taken from the Ivotuk site station Met2 during the ATLAS field project.
    • ATLAS
    1.0
    2007-11-05
    This dataset contains an aerial photograph of the grid taken in 1998 by Jason Beringer. Color adjustments performed by J.A. Anderson.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains a grid description and photo for the Ivotuk 3 (MNT) grid on the Arctic Slope, Alaska. The data were collected on the grid in 1998.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains a vegetation map (with vegetation and microsite data overlaid) of the Ivotuk 3 (MNT) Grid on the Arctic Slope, Alaska. The data were collected on the grid in 1998. For more information, please see the readme file.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains an aerial photograph of the the Ivotuk Moss Site Grid taken in 1998 by Jason Beringer. Color adjustments performed by J.A. Anderson.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains a grid description and photo for the Ivotuk 4 (Moss) grid on the Arctic Slope, Alaska. The data were collected on the grid in 1998.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains a vegetation map of the Ivotuk 4 (Moss) Grid on the Arctic Slope, Alaska. The data were collected on the grid in 1998.
    • ATLAS
    1.0
    2011-09-14
    This dataset contains Otuk Creek discharge data taken by the Snow, Shrubs, and Weather Group at the Ivotuk site as part of the ATLAS project. Measurements were taken every hour during the melt of 2000. See the readme file for the investigator's notes.
    • ATLAS
    1.0
    2007-11-05
    This dataset contains Otuk Creek discharge data taken by the Snow, Shrubs, and Weather Group at the Ivotuk site as part of the ATLAS project. Measurements were taken every hour during the melt of 2000. See the readme file for the investigator's notes.
    • ATLAS
    1.0
    2007-11-05
    This is the Peak Phytomass Data taken from the Excel file of dataset "ATLAS: 1999, Ivotuk NDVI, LAI, and Phytomass Data (EXCEL) (Epstein)" and translated into Tabular ASCII.
    • ATLAS
    1.0
    2007-11-02
    This is the Period 1 Phytomass Data taken from the Excel file of dataset "ATLAS: 1999, Ivotuk NDVI, LAI, and Phytomass Data (EXCEL) (Epstein)" and translated into Tabular ASCII.
    • ATLAS
    1.0
    2007-11-02

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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.