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  • ABoVE: Passive Microwave-derived Annual Snow Melt Duration Date Maps, 1988-2018

    https://cmr.earthdata.nasa.gov/search/concepts/C2223093928-ORNL_CLOUD.xml
    Description:

    This dataset provides the annual period of snowpack melting (i.e., snow melt duration, SMD) across northwest Canada; Alaska, U.S.; and parts of far eastern Russia at 6.25 km resolution for the period 1988-2018. SMD is the number of days between the main melt onset date (MMOD) and the last day of seasonal snow cover when the melting of snow is complete. These dates were derived from the Making Earth Science Data Records for Use in Research Environments (MEaSUREs) Calibrated Enhanced-Resolution Passive Microwave (PMW) EASE-Grid Brightness Temperature (Tb) Earth System Data Record (ESDR). This dataset documents variability in SMD across space and the 31-year temporal period. The data from 1988-2016 included a coastal mask removing coastal pixels due to potential water contamination from coarse brightness temperature observations (Dersken et al., 2012). There is not a coastal mask for the 2017-2018 data. The full data are included, and data users should be aware that coastal values can be adversely affected by adjacent water bodies.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: 51.6 -180 72.41 -107.83

    ORNL_CLOUD Short Name: SnowMeltDuration_PMicrowave_1843 Version ID: 1.1 Unique ID: C2223093928-ORNL_CLOUD

  • An investigation into Southern Hemisphere cyclone-sea ice links using long records of NCEP analyses and passive microwave data

    https://cmr.earthdata.nasa.gov/search/concepts/C1214311792-AU_AADC.xml
    Description:

    The sea ice data are the SMMR/SMMI data for the period 1978-96. These are in the form of daily (or bi-diurnal) concentration amounts on a regular grid. The data on the extratropical cyclones has been obtained using the automatic algorithm of Simmonds and Keay (2000, Journal of Climate, 873-885). This algorithm was applied to the NCEP reanalysis product for the period 1978-96. In this project, sea ice data were sourced from the National Snow and Ice Data Center (CIRES, University of Colorado, Boulder, CO 80309-0449, USA). The NCEP reanalysis data set was sourced from: NOAA/ National Weather Service, National Centers for Environmental Prediction (5200 Auth Road, Camp Springs, Maryland, 20746 USA). The sea ice concentration data used were for the Antarctic only (the entire Antarctic sea ice domain). Data started in 1978. All data were collected by satellite. A link to a metadata record for these data are available from the URL given below. Two NCEP reanalysis data sets were used in this study. The first was NCEP/NCAR, with 6-hourly data available from 1958 (see the URL provided below for further information). The second was the NCEP/DOE set, with 6-hourly data available from 1979 (see the URL provided below for further information). In this project the following model/analysis was applied: Application of The University of Melbourne cyclone tracking scheme (Simmonds et al., 2003, Monthly Weather Review, 131, 272-288) and a broad range of statistical tests. Brief details are provided in the Summary. See the link for the pdf document for more detailed information. These complex statistical analyses were run over the entire length of the project (1998/99 - 2000/01). They were run on the Sun Workstation cluster in the School of Earth Sciences, The University of Melbourne.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 -30 180

    AU_AADC Short Name: ASAC_1080 Version ID: 1 Unique ID: C1214311792-AU_AADC

  • Antarctic ice shelf disintegration triggered by sea ice loss and ocean swell

    https://cmr.earthdata.nasa.gov/search/concepts/C1542259934-AU_AADC.xml
    Description:

    The data are from our Nature Article from June 2018: "Antarctic ice shelf disintegration triggered by sea ice loss and ocean swell". The abstract is: "Understanding the causes of recent catastrophic ice shelf disintegrations is a crucial step towards improving coupled models of the Antarctic Ice Sheet and predicting its future state and contribution to sea-level rise. An overlooked climate-related causal factor is regional sea ice loss. Here we show that for the disintegration events observed (the collapse of the Larsen A and B and Wilkins ice shelves), the increased seasonal absence of a protective sea ice buffer enabled increased flexure of vulnerable outer ice shelf margins by ocean swells that probably weakened them to the point of calving. This outer-margin calving triggered wider-scale disintegration of ice shelves compromised by multiple factors in preceding years, with key prerequisites being extensive flooding and outer-margin fracturing. Wave-induced flexure is particularly effective in outermost ice shelf regions thinned by bottom crevassing. Our analysis of satellite and ocean-wave data and modelling of combined ice shelf, sea ice and wave properties highlights the need for ice sheet models to account for sea ice and ocean waves." Details of the analyses and data used, and the data generated by this study, are given in the paper: https://www.nature.com/articles/s41586-018-0212-1. Code availability: Analytical scripts used in this study are freely available from the authors via the corresponding author upon reasonable request. Data availability: The datasets and products generated during the current study are available from the corresponding author on reasonable request. The datasets forming the basis of the study are available as follows: (1) Sea ice: Daily estimates of satellite-derived sea ice concentration (gridded at a spatial resolution of 25 x 25 km) derived by the NASA Bootstrap algorithm for the period 1979-2010 were obtained from the US National Snow and Ice Data Center (NSIDC) dataset at: http://nsidc.org/data/NSIDC-0079. Accessed August 2015. (2) Waves: Ocean wave-field data were obtained from the CAWCR (Collaboration for Australian Weather and Climate Research) Wave Hindcast 1979–2010 dataset run on a 0.4 x 0.4° global grid: https://doi.org/10.4225/08/523168703DCC5. Accessed September 2017. (3) Satellite visible and thermal infrared imagery of ice shelves and disintegration events: The NOAA AVHRR image of the Larsen1995 disintegration used in Figure 2 was obtained from the British Antarctic Survey: http://www.nerc-bas.ac.uk/icd/bas_publ.html. Accessed June 2015. MODIS visible and 839 thermal infrared imagery from the US NSIDC archive at: http://nsidc.org/data/iceshelves_images/. Accessed June 2012. The study involved 2 model components, and model output is described below. The 2 models are: (i) a model of ocean swell attenuation by sea ice; and (ii) an ice shelf-ocean wave interaction model. Descriptions of both are given in the Nature paper (Methods section). DESCRIPTIONS OF THE 13 INDIVIDUAL DATA FILES PROVIDED (NB DESCRIPTIONS OF DATASETS GENERATED RELATIVE TO THE FIGURES) ARE GIVEN IN THE FILES: (1) Source data for Figures 4 (parts a-d), 5 and 6a are given in Excel spreadsheet files "Source-Data_2017-07-09041A_Figure.....xlsx". (2) Source data for Extended Data Figures 1 (parts a-b), 3 (parts b,d and parts a,c), 4 (parts b,d and a,c) and 6 are given in Excel spreadsheet files "Source-Data_2017-07-09041A_EDFig.....xlsx".

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -75.06848 -95.625 -59.80867 -34.45315

    AU_AADC Short Name: AAS_4116_IceShelfStudy Version ID: 1 Unique ID: C1542259934-AU_AADC

  • Arctic and Southern Ocean Sea Ice Concentrations, Version 1

    https://cmr.earthdata.nasa.gov/search/concepts/C1386246223-NSIDCV0.xml
    Description:

    This data set provides monthly sea ice concentration for the Arctic from 1901 to 1995 and for the Southern Oceans from 1973 to 1990 on a standard 1-degree grid (cylindrical projection) to provide a relatively uniform set of sea ice extent for all longitudes. The data are in ASCII format and are available via FTP.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: 40 -180 90 180

    NSIDCV0 Short Name: G00799 Version ID: 1 Unique ID: C1386246223-NSIDCV0

  • Arctic Sea Ice Seasonal Change and Melt/Freeze Climate Indicators from Satellite Data, Version 1

    https://cmr.earthdata.nasa.gov/search/concepts/C1593699726-NSIDCV0.xml
    Description:

    The product contains melt-season indicators that can be used to delineate various stages in the summer melt and freeze-up period of sea ice. The data were primarily derived using Sea Ice Concentration (SIC) observations from the NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration and brightness temperature observations from the DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures; both input data sets are archived at NSIDC. The main parameters for this data set include the dates of melt onset, early melt onset, and continuous melt onset; dates of early and continuous freeze onset; day of opening (last day SIC is above 80%); day of retreat (last day SIC drops below 15%); day of advance (first day SIC increases above 15%); day of closing (first day SIC increases above 80%); total outer ice-free period; total inner ice-free period; seasonal loss-of-ice period; seasonal gain-of-ice period; and the seasonal ice zone. These data are available for 1979 through 2017. They are gridded on the NSIDC northern hemisphere polar stereographic grid at 25 km.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: 30 -180 90 180

    NSIDCV0 Short Name: NSIDC-0747 Version ID: 1 Unique ID: C1593699726-NSIDCV0

  • Arctic Soil Freeze/Thaw Status from SMMR and SSM/I, Version 2

    https://cmr.earthdata.nasa.gov/search/concepts/C1386246391-NSIDCV0.xml
    Description:

    This data set contains near-surface (< 5 cm) soil freeze/thaw status on snow-free and snow-covered land surfaces over the Arctic terrestrial drainage basin. The near-surface soil freeze/thaw status is determined by using passive-microwave remote sensing data over snow-free land and a numerical model over snow-covered land. Data are projected to a 25 km x 25 km Northern Hemisphere EASE-Grid. Version 2 of this data set greatly extends the temporal coverage and makes use of data from SMMR as well as SSM/I. Data are from October 1978 to June 2004. Data are in ASCII text format and are available via FTP.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: 45 -180 90 180

    NSIDCV0 Short Name: GGD641 Version ID: 2 Unique ID: C1386246391-NSIDCV0

  • Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS V003

    https://cmr.earthdata.nasa.gov/search/concepts/C1517700856-NSIDC_ECS.xml
    Description:

    This sea ice concentration data set was derived using measurements from the Scanning Multichannel Microwave Radiometer (SMMR) on the Nimbus-7 satellite and from the Special Sensor Microwave/Imager (SSM/I) sensors on the Defense Meteorological Satellite Program's (DMSP) -F8, -F11, and -F13 satellites. Measurements from the Special Sensor Microwave Imager/Sounder (SSMIS) aboard DMSP-F17 are also included. The data set has been generated using the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) Bootstrap Algorithm with daily varying tie-points. Daily (every other day prior to July 1987) and monthly data are available for both the north and south polar regions. Data are gridded on the SSM/I polar stereographic grid (25 x 25 km) and provided in two-byte integer format.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 -39 180

    NSIDC_ECS Short Name: NSIDC-0079 Version ID: 3 Unique ID: C1517700856-NSIDC_ECS

  • BOREAS RSS-10 TOMS Circumpolar One-Degree PAR Images

    https://cmr.earthdata.nasa.gov/search/concepts/C179003492-ORNL_DAAC.xml
    Description:

    The BOREAS RSS-10 team investigated the magnitude of daily, seasonal, and yearly variations of PAR from ground and satellite observations. This data set contains satellite estimates of surface-incident photosynthetically active radiation (PAR, 400-700 nm, MJ m-2) at 1 degree spatial resolution. The spatial coverage is circumpolar from latitudes of 41 to 66 degrees N latitude.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: 41.5 -180 65.5 180

    ORNL_DAAC Short Name: BOREAS_RSS10TOM_443 Version ID: 1 Unique ID: C179003492-ORNL_DAAC

  • CanSISE Observation-Based Ensemble of Northern Hemisphere Terrestrial Snow Water Equivalent, Version 2

    https://cmr.earthdata.nasa.gov/search/concepts/C1386256679-NSIDCV0.xml
    Description:

    This data set is a daily gridded terrestrial snow water equivalent (SWE) dataset based on five component SWE products: <ul> <li><a href="http://www.globsnow.info">GlobSnow combined SWE product (passive microwave/ground-based weather station, version 2)</a></li> <li><a href="http://apps.ecmwf.int/datasets/.">ERA-Interim/Land reanalysis SWE product</a></li> <li><a href="http://gmao.gsfc.nasa.gov/pubs/docs/Reichle541.pdf">MERRA reanalysis SWE product </a></li> <li>Crocus SWE data set: output from the Crocus snowpack model, driven by ERA-Interim meteorology (<a href="http://dx.doi.org/10.1175/JHM-D-12-012.1">Brun et al. 2013</a>)</li> <li>GLDAS SWE product (version 2) (<a href="http://dx.doi.org/10.1175/BAMS-85-3-381">Rodell et al. 2004</a>; <a href="http://dx.doi.org/10.5067/0JNJQ8ZDZRBA">Rodell and Beaudoing 2013</a>)</li> </ul>

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: 0 -180 90 180

    NSIDCV0 Short Name: NSIDC-0668 Version ID: 2 Unique ID: C1386256679-NSIDCV0

  • Change and variability in East Antarctic sea ice seasonality 1979/80-2009/10

    https://cmr.earthdata.nasa.gov/search/concepts/C1667374128-AU_AADC.xml
    Description:

    This dataset relates to long-term change and variability in annual timings of sea ice advance, retreat and resultant ice season duration in East Antarctica derived from the satellite passive-microwave time series dating back to Nimbus 7. These were calculated from satellite-derived ice concentration data for the period 1979/80 to 2009/10. The dataset includes more detailed analysis of change and variability in sea ice conditions along meridional transects i.e., 110 degrees E and 140 degrees E relating to sea ice concentration and extent, and along 90 deg E, 100 deg E, 110 deg E and 140 deg E for trends in sea ice concentration for the period 1979-2010. Also included are monthly sea-surface temperature (SST) trends mapped north of the East Antarctic sea-ice zone for the period 1982-2010. The SST data are from the Reynolds and Smith OLv2 dataset. These data form the basis of the publication: Massom, R.A., P. Reid, S. Stammerjohn, B. Raymond, A. Fraser and S. Ushio. 2013. Change and variability in East Antarctic sea ice seasonality, 1979/80-2009/10. PloS ONE, 8(5), e64756, doi:10.1371/journal.pone.0064756

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -74 30 -46 170

    AU_AADC Short Name: AAS_4116_Sea-Ice-Seasonality-East-Antarctic Version ID: 1 Unique ID: C1667374128-AU_AADC