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wdc-climate.de:3501558 eng; USA collection MODIS__Arctic__MPF_V02 Dr. Stefan Kern University of Hamburg http://www.cen.uni-hamburg.de/ pointOfContact Dr. Stefan Kern University of Hamburg http://www.cen.uni-hamburg.de/ pointOfContact 2015-09-15T12:51:13 ISO 19115 ISO 19115-2:2009 Gridded Melt Pond Cover Fraction on Arctic Sea Ice derived from TERRA-MODIS 8-day composite Reflectance Data bias corrected Version 02 2015-12-03 publication 1 MODIS__Arctic__MPF_V02 doi:10.1594/WDCC/MODIS__Arctic__MPF_V02 Prof. Dr. Lars Kaleschke University of Hamburg https://www.ifm.uni-hamburg.de/en.html Email: lars.kaleschke@uni-hamburg.de principalInvestigator Dr. Anja Rösel University of Hamburg http://www.cen.uni-hamburg.de/ Email: anja.rosel@npolar.no originator Dr. Anja Rösel University of Hamburg https://www.ifm.uni-hamburg.de/en.html Email: anja.rosel@npolar.no author Prof. Dr. Lars Kaleschke University of Hamburg http://www.cen.uni-hamburg.de/ Email: lars.kaleschke@uni-hamburg.de author Dr. Stefan Kern University of Hamburg http://www.cen.uni-hamburg.de/ Email: stefan.kern@uni-hamburg.de author WDC Climate at DKRZ publisher 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 with those grid cells (with 12.5 km grid resolution) flagged as invalid where less than 90 % of the native 500 m grid resolution data indicate clear sky conditions. Valid for all these layers is, that grid cells with an open water fraction larger than 85 % have been flagged as invalid as well. The data set offered here is version 02 of the melt pond data set. The main difference to version 01 is a bias correction carried out to remove a positive bias in the melt pond fraction and in the open water fraction. Dr. Stefan Kern University of Hamburg http://www.cen.uni-hamburg.de/ pointOfContact NetCDF EOS-TERRA arctic ocean scientific use: For scientific use only eng; USA 0.0 360.0 60.0 90.0 calendrical 2000-05-08 2011-09-13 melt_pond_area_fraction_at_top_of_sea_ice (standard_deviation) melt pond area fraction at top of sea ice standard_deviation [CF-Guidelines for construction]; unit: n/a time time [CF-Standard Name]; unit: n/a melt_pond_area_fraction_at_top_of_sea_ice_assuming_clear_sky melt pond area fraction at top of sea ice assuming clear sky [CF-Guidelines for construction]; unit: n/a longitude longitude [CF-Standard Name]; unit: n/a land_binary_mask X_binary_mask has 1 where condition X is met, 0 elsewhere. 1 = land, 0 = sea. [CF-Standard Name]; unit: n/a latitude latitude [CF-Standard Name]; unit: n/a number_of_valid_data_per_grid_cell [CF-Guidelines for construction]; unit: n/a sea_area_fraction Sea Area Fraction [CF-Standard Name]; unit: n/a melt_pond_area_fraction_at_top_of_sea_ice_assuming_clear_sky (standard_deviation) melt pond area fraction at top of sea ice assuming clear sky (standard_deviation) [CF-Guidelines for construction]; unit: n/a projection_x_coordinate "x" indicates a vector component along the grid x-axis, when this is not true longitude, positive with increasing x. Projection coordinates are distances in the x- and y-directions on a plane onto which the surface of the Earth has been projected according to a map projection. The relationship between the projection coordinates and latitude and longitude is described by the grid_mapping. [CF-Standard Name]; unit: n/a projection_y_coordinate "y" indicates a vector component along the grid y-axis, when this is not true latitude, positive with increasing y. Projection coordinates are distances in the x- and y-directions on a plane onto which the surface of the Earth has been projected according to a map projection. The relationship between the projection coordinates and latitude and longitude is described by the grid_mapping. [CF-Standard Name]; unit: n/a melt_pond_area_fraction_at_top_of_sea_ice melt pond area fraction at top of sea ice [CF-Guidelines for construction]; unit: n/a sea_area_fraction_assuming_clear_sky sea_area_fraction_assuming_clear_sky [CF-Guidelines for construction]; unit: n/a NetCDF 2486 https://www.wdc-climate.de/ui/entry?acronym=MODIS__Arctic__MPF_V02 information collection n/a None n/a None