<?xml version="1.0" encoding="UTF-8"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-05-14T04:46:00Z</responseDate><request identifier="NSIDC-0749.001" metadataPrefix="dif" verb="GetRecord">http://nsidc.org/api/dataset/metadata/oai</request><GetRecord><record><header><identifier>oai:nsidc.org/NSIDC-0749.001</identifier><datestamp>2025-12-22T21:19:07Z</datestamp><setSpec>v0_daac</setSpec><setSpec>v0_all</setSpec><setSpec>nasa_nsidc_daac</setSpec></header><metadata>
<DIF xmlns="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/ http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/dif_v9.7.1.xsd"><Entry_ID>NSIDC-0749.001</Entry_ID><Entry_Title>Quicklook Arctic Weekly EASE-Grid Sea Ice Age</Entry_Title><Data_Set_Citation><Dataset_Creator>Tschudi, M., Meier, W. N. &amp; Stewart, J. S.</Dataset_Creator><Dataset_Title>Quicklook Arctic Weekly EASE-Grid Sea Ice Age</Dataset_Title><Dataset_Release_Date>2019-05-16</Dataset_Release_Date><Dataset_Release_Place>Boulder, Colorado USA</Dataset_Release_Place><Dataset_Publisher>NASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center</Dataset_Publisher><Version>1</Version><Other_Citation_Details><Invert_Citation_Order>false</Invert_Citation_Order></Other_Citation_Details><Dataset_DOI>10.5067/2XXGZY3DUGNQ</Dataset_DOI><Online_Resource>https://nsidc.org/sites/default/files/nsidc-0749-v001-userguide.pdf</Online_Resource><Dataset_Series_Name>NSIDC-0749</Dataset_Series_Name></Data_Set_Citation><Personnel><Role>Technical Contact</Role><First_Name>NSIDC</First_Name><Last_Name>User Services</Last_Name><Email>nsidc@nsidc.org</Email><Phone>1-303-492-6199</Phone><Fax>1-303-492-2468</Fax><Contact_Address><Address>CIRES, 449 UCB</Address><Address>University of Colorado</Address><City>Boulder</City><Province_or_State>CO</Province_or_State><Postal_Code>80309-0449</Postal_Code><Country>USA</Country></Contact_Address></Personnel><Personnel><Role>Investigator</Role><First_Name>Mark</First_Name><Last_Name>Tschudi</Last_Name><Email>mark.tschudi@colorado.edu</Email><Contact_Address><Address>431 UCB
</Address><City>Boulder</City><Province_or_State>Colorado</Province_or_State><Postal_Code>80309-0431</Postal_Code><Country>USA</Country></Contact_Address></Personnel><Personnel><Role>Investigator</Role><First_Name>Walter</First_Name><Middle_Name>N</Middle_Name><Last_Name>Meier</Last_Name><Email>walt@nsidc.org</Email><Contact_Address><City>Boudler</City><Province_or_State>CO</Province_or_State><Postal_Code>80309</Postal_Code><Country>USA</Country></Contact_Address></Personnel><Personnel><Role>Investigator</Role><First_Name>J</First_Name><Middle_Name>S</Middle_Name><Last_Name>Stewart</Last_Name><Email>scottincolorado@gmail.com</Email><Contact_Address><Country/></Contact_Address></Personnel><Parameters><Category>EARTH SCIENCE</Category><Topic>CRYOSPHERE</Topic><Term>SEA ICE</Term><Variable_Level_1>SEA ICE AGE</Variable_Level_1><Variable_Level_2> </Variable_Level_2><Variable_Level_3> </Variable_Level_3><Detailed_Variable> </Detailed_Variable></Parameters><Keyword>EASE-Grid Sea Ice-project</Keyword><Keyword>Sea Ice Age</Keyword><Keyword>Sea Ice Prediction Network-project</Keyword><Keyword>SIPN ice type-project</Keyword><Keyword>SIPN-project</Keyword><Keyword>SMMR and SSM/I-SSMIS-project</Keyword><Keyword>smmr-ssmi-project</Keyword><Sensor_Name><Short_Name>AMSR2</Short_Name><Long_Name>Advanced Microwave Scanning Radiometer 2</Long_Name></Sensor_Name><Sensor_Name><Short_Name>DRIFTING BUOYS</Short_Name></Sensor_Name><Sensor_Name><Short_Name>SSMIS</Short_Name><Long_Name>Special Sensor Microwave Imager/Sounder</Long_Name></Sensor_Name><Source_Name><Short_Name>BUOYS</Short_Name></Source_Name><Source_Name><Short_Name>DMSP 5D-3/F18</Short_Name><Long_Name>Defense Meteorological Satellite Program-F18</Long_Name></Source_Name><Source_Name><Short_Name>GCOM-W1</Short_Name><Long_Name>Global Change Observation Mission 1st-Water</Long_Name></Source_Name><Temporal_Coverage><Start_Date>2025-01-01</Start_Date></Temporal_Coverage><Data_Set_Progress>active</Data_Set_Progress><Spatial_Coverage><Southernmost_Latitude>29.7</Southernmost_Latitude><Northernmost_Latitude>90</Northernmost_Latitude><Westernmost_Longitude>-180</Westernmost_Longitude><Easternmost_Longitude>180</Easternmost_Longitude></Spatial_Coverage><Location><Location_Category>OCEAN</Location_Category><Location_Type>ARCTIC OCEAN</Location_Type></Location><Data_Resolution><Latitude_Resolution>12.5 km</Latitude_Resolution><Longitude_Resolution>12.5 km</Longitude_Resolution><Temporal_Resolution>7 day</Temporal_Resolution></Data_Resolution><Access_Constraints>These data are freely, openly, and fully accessible, provided that you are logged into your NASA Earthdata profile (https://urs.earthdata.nasa.gov/).</Access_Constraints><Use_Constraints>These data are freely, openly, and fully available to use without restrictions, provided that you cite the data according to the recommended citation at https://nsidc.org/about/use_copyright.html. For more information on the NASA EOSDIS Data Use Policy, see https://earthdata.nasa.gov/earth-observation-data/data-use-policy. Quicklook data provide an estimate of conditions based on information and algorithms available at the time the data are collected. They are not reviewed prior to release. Data may be replaced or removed without notice, and generally will not be reprocessed to correct or remove erroneous data, or to fill in missing data that may become available.</Use_Constraints><Data_Set_Language>English</Data_Set_Language><Originating_Center>NASA NSIDC DAAC</Originating_Center><Data_Center><Data_Center_Name><Short_Name>NASA NSIDC DAAC</Short_Name><Long_Name>NASA National Snow and Ice Data Center Distributed Active Archive Center</Long_Name></Data_Center_Name><Data_Center_URL>https://nsidc.org/daac</Data_Center_URL><Personnel><Role>Data Center Contact</Role><First_Name>NSIDC</First_Name><Last_Name>User Services</Last_Name><Email>nsidc@nsidc.org</Email><Phone>1-303-492-6199</Phone><Contact_Address><Address>National Snow and Ice Data Center</Address><Address>CIRES, 449 UCB</Address><Address>University of Colorado</Address><City>Boulder</City><Province_or_State>CO</Province_or_State><Postal_Code>80309-0449</Postal_Code><Country>USA</Country></Contact_Address></Personnel></Data_Center><Distribution><Distribution_Media>HTTPS</Distribution_Media><Distribution_Format>NetCDF</Distribution_Format></Distribution><Distribution><Distribution_Media>HTTPS</Distribution_Media><Distribution_Format>PNG</Distribution_Format></Distribution><Reference/><Summary><Abstract>This data set is the quicklook version of the EASE-Grid Sea Ice Age product (https://nsidc.org/data/nsidc-0611). It is derived from the Quicklook Arctic Weekly EASE-Grid Sea Ice Motion Vectors data set (https://nsidc.org/data/nsidc-0748).</Abstract></Summary><Related_URL><URL_Content_Type><Type>VIEW RELATED INFORMATION</Type></URL_Content_Type><URL>https://nsidc.org/sites/default/files/nsidc-0749-v001-userguide.pdf</URL><Description>Quicklook Arctic Weekly EASE-Grid Sea Ice Age, Version 1 User Guide</Description></Related_URL><Related_URL><URL_Content_Type><Type>GET DATA</Type></URL_Content_Type><URL>https://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0749_ql_iceage/</URL><Description>HTTPS</Description></Related_URL><Metadata_Name>CEOS IDN DIF</Metadata_Name><Metadata_Version>VERSION 9.9</Metadata_Version><DIF_Creation_Date>2019-05-16</DIF_Creation_Date><Last_DIF_Revision_Date>2025-12-22</Last_DIF_Revision_Date><Extended_Metadata><Metadata><Group>NSIDC</Group><Name>Version Summary</Name><Value>Initial Release</Value></Metadata><Metadata><Group>NSIDC</Group><Name>Minor Version</Name><Value/></Metadata><Metadata><Group>NSIDC</Group><Name>Current Version</Name><Value>1</Value></Metadata><Metadata><Group>NSIDC</Group><Name>Spatial Reference Systems</Name><Value><Spatial_Reference_System><SRID>EPSG:3408</SRID><Description>NSIDC EASE-Grid North</Description></Spatial_Reference_System></Value></Metadata><Metadata><Group>NSIDC</Group><Name>Level of Service</Name><Value><Level>Standard</Level></Value></Metadata><Metadata><Group>NSIDC</Group><Name>Full Dataset Citation</Name><Value>Tschudi, M., Meier, W. 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