Daily Rain-on-Snow Data Record Time Series Derived from AMSR-E and AMSR2, Version 1 (WY2003 – WY2016)

The Version 1 AMSR-E/2 Rain-on-Snow Data Record (ROS) was generated from daily brightness temperatures (Tb) at vertically and horizontally polarized 36.5 GHz and 18.7 GHz from the Advanced Microwave Scanning Radiometer for EOS and Advanced Microwave Scanning Radiometer 2 (AMSR-E/2) across Alaska, USA for water years (WY) 2003 to 2016. The AMSR-E/2 orbital swath Tb data were spatially re-sampled to a 6-km resolution on a polar EASE-Grid (version 2) format using an inverse distance squared weighting method (Brodzick et al. 2012, Du et al. 2017). To ensure cross-sensor consistency, the gridded AMSR-2 Tb data were empirically calibrated against the same AMSRE frequencies using a Double-Differencing method and similar overlapping observations from the FY3B MWRI sensor record (Du et al. 2014).

ROS events and associated snow wetness, induced by atmospheric conditions, were detected using a spectral Gradient Ratio to exploit the 19 and 37 GHz dielectric properties in response to rain-on-snow events and enhanced liquid water content (LWC) within the surface snowpack (Grenfell and Putkonen 2008). The Gradient Ratio is applied to vertical and horizontal polarizations, respectively. The proceedings Gradient Ratios are then ratioed together using a Gradient Ratio Polarization (GRP) (Dolant et al. 2016, Langlois et al. 2017). A threshold value is then applied to the GRP to detect ROS. The threshold is set to < 1 for elevations below 900 m and < -5 for elevations above 900 m.

The satellite derived data record allows for the identification of ROS events at a relatively fine spatial resolution and high temporal resolution. Data are provided at daily acquisitions, allowing for the identification of single ROS events; and monthly annual aggregations from November through March.

리소스

항목
CKAN dataset id 25ef7629-1fe3-4cec-878e-5651fd0199c1
상태 active
url https://catalog.data.gov/dataset/daily-rain-on-snow-data-record-time-series-derived-from-amsr-e-and-amsr2-version-1-wy2003-
버전 2024-06-04
라이선스 notspecified
@id http://datainventory.doi.gov/id/dataset/99fadb375a572962386e609bbfc8e017
accessLevel public
bureauCode {010:24}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://datainventory.doi.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
dataQuality true
harvest_object_id 3cd23da4-3b00-4f57-a1fc-c73912ed4687
harvest_source_id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
harvest_source_title DOI EDI
identifier NPS_DataStore_2268529
issued 2018-02-01T12:00:00Z
landingPage https://irma.nps.gov/DataStore/Reference/Profile/2268529
metadata_type geospatial
modified 2018-02-01
old-spatial -179.0,49.0,-114.5,73.0
programCode {010:118,010:119}
publisher National Park Service
publisher_hierarchy White House > U.S. Department of the Interior > National Park Service
references {https://irma.nps.gov/DataStore/Reference/Profile/2268529,http://files.ntsg.umt.edu/data/AMSR_ROS/}
resource-type Dataset
source_datajson_identifier true
source_hash 87bfd6e4f7b82130955db54df54b457743d6dfb5fcb89abe0f23e0ff0850bda7
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-179.0, 49.0], [-179.0, 73.0], [-114.5, 73.0], [-114.5, 49.0], [-179.0, 49.0]]]}
temporal 2002-10-01T12:00:00Z/2016-09-01T12:00:00Z
theme {geospatial}
담당자 NPS IRMA Help
담당자 연락처 NRSS_DataStore@nps.gov
제공 기관 Department of the Interior
최초 수집 일시 2024-02-20T22:46:13…
최근 수집 일시 2024-07-01T16:29:35…

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