de.dkrz.wdcc.iso2444135 series MODIS__Arctic__MPF Dr. Anja Rösel University of Hamburg (IfM) https://www.ifm.uni-hamburg.de/en.html author Prof. Dr. Lars Kaleschke University of Hamburg / KlimaCampus http://icdc.zmaw.de author Dr. Stefan Kern University of Hamburg / KlimaCampus http://icdc.zmaw.de author Dr. Stefan Kern University of Hamburg / KlimaCampus http://icdc.zmaw.de pointOfContact Prof. Dr. Lars Kaleschke University of Hamburg (IfM) https://www.ifm.uni-hamburg.de/en.html originator Dr. Anja Rösel University of Hamburg / KlimaCampus http://icdc.zmaw.de originator 2022-04-25T05:17:51 ISO 19115 ISO 19139 / DKRZ ISO Simple Profile V1.0 http://doi.org/doi:10.1594/WDCC/MODIS__Arctic__MPF MODIS__Arctic__MeltPondFraction__UHAM-CliSAP-ICDC__v01__12.5km__8day MODIS__Arctic__MeltPondFraction__UHAM-CliSAP-ICDC__v01__12.5km__8day 2013-01-07 creation None Gridded Melt Pond Cover Fraction on Arctic Sea Ice derived from TERRA-MODIS 8-day composite Reflectance Data doi:10.1594/WDCC/MODIS__Arctic__MPF Prof. Dr. Lars Kaleschke University of Hamburg (IfM) https://www.ifm.uni-hamburg.de/en.html originator Dr. Anja Rösel University of Hamburg / KlimaCampus http://icdc.zmaw.de originator doi:10.1594/WDCC/MODIS__Arctic__MPF Reflectances measured in the visible frequency range at three channels of the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Earth Observation Satellite (EOS) TERRA were used to derive the melt pond fraction on Arctic sea ice using an artificial neural network. This analysis was done on reflectances gridded onto a polar-stereographic grid tangent to the Earths' surface at 70 deg N with 500 m grid resolution. The reflectances used originate from the 8-day composite reflectances provided via https://wist.echo.nasa.gov/api/ as product: "MODIS surface Reflectance 8-Day L3 Global 500m SIN Grid V005". After gridding and flagging for clouds and other disturbances the artificial neural network was applied, providing fractions of three surface classes: 1) melt ponds, 2) sea ice and snow, and 3) open water at 500 m grid resolution. This data has been interpolated onto a similar polar-stereographic grid but with 12.5 km grid resolution. The data set offered here comprises several data layers: the melt pond fraction, its standard deviation, the open water fraction, and the number of individual valid grid cells with 500 m grid resolution included in each 12.5 km grid cell. In addition, in three separate data layers melt pond fraction, its standard deviation, and the open water fraction are given only for those grid cells (with 12.5 km grid resolution) where more than 90 % of the native 500 m grid resolution data indicate clear sky conditions. Grid cells with an open water fraction larger than 85 % have been generally flagged as invalid. The data set is updated annually. Dr. Anja Rösel University of Hamburg (IfM) https://www.ifm.uni-hamburg.de/en.html author Prof. Dr. Lars Kaleschke University of Hamburg / KlimaCampus http://icdc.zmaw.de author Dr. Stefan Kern University of Hamburg / KlimaCampus http://icdc.zmaw.de author Dr. Stefan Kern University of Hamburg / KlimaCampus http://icdc.zmaw.de pointOfContact ocean theme arctic theme EOS-TERRA theme eng 0.0 360.0 60.0 90.0 2000-05-08 2011-09-13 12 land_binary_mask modelResult n/a latitude modelResult n/a longitude modelResult n/a melt_pond_area_fraction_at_top_of_sea_ice modelResult n/a melt_pond_area_fraction_at_top_of_sea_ice modelResult n/a melt_pond_area_fraction_at_top_of_sea_ice_assuming_clear_sky modelResult n/a melt_pond_area_fraction_at_top_of_sea_ice_assuming_clear_sky modelResult n/a number_of_valid_data_per_grid_cell modelResult n/a projection_x_coordinate modelResult n/a projection_y_coordinate modelResult n/a sea_area_fraction modelResult n/a sea_area_fraction_assuming_clear_sky modelResult n/a time modelResult n/a netCDF.tar tarball of network Common Data Format files distributor Mb 2486 http://doi.org/doi:10.1594/WDCC/MODIS__Arctic__MPF series