Sea Ice Concentration, NOAA/NSIDC Climate Data Record V4, Southern Hemisphere, 25km, Science Quality, 1978-Present, Daily

This data set provides a passive microwave sea ice concentration climate data record (CDR) based on gridded brightness temperatures (TBs) from the Defense Meteorological Satellite Program (DMSP) series of passive microwave radiometers: the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR), the Special Sensor Microwave Imager (SSM/I) and the Special Sensor Microwave Imager/Sounder (SSMIS). The sea ice concentration CDR is an estimate of sea ice concentration that is produced by combining concentration estimates from two algorithms developed at the NASA Goddard Space Flight Center (GSFC): the NASA Team algorithm and the Bootstrap algorithm. The individual algorithms are used to process and combine brightness temperatures at National Snow and Ice Data Center (NSIDC). This product is designed to provide a consistent time series of sea ice concentrations (the fraction, or percentage, of ocean area covered by sea ice) from November 1978 to the present which spans the coverage of several passive microwave instruments. The data are gridded on the NSIDC polar stereographic grid with 25 x 25 km grid cells, and are available in Network Common Data Format (NetCDF) file format. Each file contains a variable with the CDR concentration values as well as variables that hold the NASA Team and Bootstrap processed concentrations for reference. Variables containing standard deviation, quality flags, and projection information are also included. Data are available from NSIDC via FTP see https://nsidc.org/data/G02202/versions/4/. Data are also distributed via the PolarWatch ERDDAP at https://polarwatch.noaa.gov/erddap. Note that the data format available through PolarWatch is different from the NSIDC FTP NetCDF files. The PolarWatch data server stores projection information as global attributes (with the prefix grid_mapping) instead of as a variable; and the timestamp is served in different units (seconds since 1970).
_NCProperties=version=2,netcdf=4.8.1,hdf5=1.10.6
acknowledgement=This project was supported in part by a grant from the NOAA Climate Data Record Program. Production of original NASA Team and Bootstrap algorithm estimates supported by the NASA Polar Distributed Active Archive Center. The sea ice concentration algorithms were developed by Donald J. Cavalieri, Josefino C. Comiso, Claire L. Parkinson, and others at the NASA Goddard Space Flight Center in Greenbelt, MD.
cdm_data_type=Grid
cdr_variable=cdr_seaice_conc
contributor_name=Walter N. Meier, Florence Fetterer, Ann Windnagel, J. Scott Stewart, Trey Stafford, Matt Fisher
contributor_role=principal investigator, author, author, software developer, software developer, software developer
Conventions=CF-1.6, ACDD-1.3, COARDS
defaultGraphQuery=cdr_seaice_conc%5Blast%5D%5B(4337500.0):(-3937500.0)%5D%5B(-3937500.0):(3937500.0)%5D&.draw=surface
grid_mapping_false_easting=0.0
grid_mapping_false_northing=0.0
grid_mapping_GeoTransform=-3950000.0 25000.0 0 4350000.0 0 -25000.0
grid_mapping_grid_boundary_bottom_projected_y=-3950000.0
grid_mapping_grid_boundary_left_projected_x=-3950000.0
grid_mapping_grid_boundary_right_projected_x=3950000.0
grid_mapping_grid_boundary_top_projected_y=4350000.0
grid_mapping_latitude_of_projection_origin=-90.0
grid_mapping_longitude_of_projection_origin=0.0
grid_mapping_name=polar_stereographic
grid_mapping_parent_grid_cell_column_subset_end=316.0
grid_mapping_parent_grid_cell_column_subset_start=0.0
grid_mapping_parent_grid_cell_row_subset_end=332.0
grid_mapping_parent_grid_cell_row_subset_start=0.0
grid_mapping_proj4text=+proj=stere +lat_0=-90 +lat_ts=-70 +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378273 +b=6356889.449 +units=m +no_defs
grid_mapping_scaling_factor=1.0
grid_mapping_semimajor_radius=6378273.0
grid_mapping_semiminor_radius=6356889.449
grid_mapping_spatial_ref=PROJCS["NSIDC Sea Ice Polar Stereographic South",GEOGCS["Unspecified datum based upon the Hughes 1980 ellipsoid",DATUM["Not_specified_based_on_Hughes_1980_ellipsoid",SPHEROID["Hughes 1980",6378273,298.279411123061,AUTHORITY["EPSG","7058"]],AUTHORITY["EPSG","6054"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4054"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Polar_Stereographic"],PARAMETER["latitude_of_origin",-70],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],AUTHORITY["EPSG","3412"],AXIS["X",UNKNOWN],AXIS["Y",UNKNOWN]]
grid_mapping_srid=urn:ogc:def:crs:EPSG::3412
grid_mapping_standard_parallel=-70.0
grid_mapping_straight_vertical_longitude_from_pole=180.0
grid_mapping_units=meters
history=Generated from NSIDC0001
id=https://doi.org/10.7265/sr8p-kc62
infoUrl=https://nsidc.org/
institution=NSIDC > National Snow and Ice Data Center
keywords_vocabulary=GCMD Science Keywords
metadata_Link=https://nsidc.org/data/g02202/versions/4/
naming_authority=org.doi.dx
platform=DMSP 5D-3/F17 > Defense Meteorological Satellite Program-F17
processing_level=NOAA Level 3
program=NOAA Climate Data Record Program
proj_crs_code=EPSG:3412
proj_crs_code_description=The proj_crs_code attribute references a registered projection identifier (i.e. EPSG) when available. If the projection is not registered, non-standard then this attribute references a PolarWatch assigned internal identifier.
project=NOAA/NSIDC passive microwave sea ice concentration climate data record
references=Comiso, J. C., and F. Nishio. 2008. Trends in the Sea Ice Cover Using Enhanced and Compatible AMSR-E, SSM/I, and SMMR Data. Journal of Geophysical Research 113, C02S07, doi:10.1029/2007JC0043257. ; Comiso, J. C., D. Cavalieri, C. Parkinson, and P. Gloersen. 1997. Passive Microwave Algorithms for Sea Ice Concentrations: A Comparison of Two Techniques. Remote Sensing of the Environment 60(3):357-84. ; Comiso, J. C. 1984. Characteristics of Winter Sea Ice from Satellite Multispectral Microwave Observations. Journal of Geophysical Research 91(C1):975-94. ; Cavalieri, D. J., P. Gloersen, and W. J. Campbell. 1984. Determination of Sea Ice Parameters with the NIMBUS-7 SMMR. Journal of Geophysical Research 89(D4):5355-5369. ; Cavalieri, D. J., C. l. Parkinson, P. Gloersen, J. C. Comiso, and H. J. Zwally. 1999. Deriving Long-term Time Series of Sea Ice Cover from Satellite Passive-Microwave Multisensor Data Sets. Journal of Geophysical Research 104(7): 15,803-15,814. Comiso, J.C., R.A. Gersten, L.V. Stock, J. Turner, G.J. Perez, and K. Cho. 2017. Positive Trend in the Antarctic Sea Ice Cover and Associated Changes in Surface Temperature. J. Climate, 30, 2251–2267, https://doi.org/10.1175/JCLI-D-16-0408.1
sensor=SSMI/S > Special Sensor Microwave Imager/Sounder
software_version_id=[e-mail]:nsidc/seaice_cdr.git@22aac63463cb6013d2a29279c81d130e1f1b0403
source=Generated from NSIDC0001
sourceUrl=(local files)
spatial_resolution=25km
standard_name_vocabulary=CF Standard Name Table v70
time_coverage_duration=P1D
time_coverage_end=2024-06-30T00:00:00Z
time_coverage_resolution=P1D
time_coverage_start=1978-10-25T00:00:00Z

本数据集提供了一种基于国防气象卫星计划（DMSP）系列被动微波辐射计（如Nimbus-7扫描多通道微波辐射计（SMMR）、特殊传感器微波成像仪（SSM/I）和特殊传感器微波成像仪/探测仪（SSMIS））网格化亮度温度（TBs）的被动微波海冰浓度气候数据记录（CDR）。海冰浓度CDR是通过结合美国宇航局戈达德航天中心（GSFC）开发的两种算法（NASA团队算法和Bootstrap算法）得出的海冰浓度估计值而形成的。这些单独的算法用于处理和组合国家冰雪数据中心（NSIDC）的亮度温度。该产品旨在提供从1978年11月至今的海冰浓度一致时间序列（海洋面积被海冰覆盖的分数或百分比），涵盖了多个被动微波仪器的覆盖范围。数据以25 x 25公里网格单元的NSIDC极地投影网格进行网格化，并以网络公共数据格式（NetCDF）文件格式提供。每个文件包含一个变量，其中包含CDR浓度值，以及包含NASA团队和Bootstrap处理浓度的变量，供参考。还包括包含标准偏差、质量标志和投影信息的变量。数据可通过NSIDC的FTP获取，请参阅https://nsidc.org/data/G02202/versions/4/。数据还通过PolarWatch ERDDAP在https://polarwatch.noaa.gov/erddap/进行分发。请注意，通过PolarWatch获取的数据格式与NSIDC FTP NetCDF文件不同。PolarWatch数据服务器将投影信息作为全局属性（带有前缀grid_mapping）存储，而不是作为变量；时间戳以不同的单位（自1970年以来的秒数）提供。