Not logged in
Data Publisher for Earth & Environmental Science

Cai, Yu; Duguay, Claude R; Ke, Chang-Qing (2022): Lake ice phenology in the Northern Hemisphere extracted from SMMR, SSM/I and SSMIS data from 1979 to 2021 [dataset]. PANGAEA,

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

This dataset contains ice phenology for 56 lakes in the Northern Hemisphere from 1979 to 2021. The ice phenology was extracted from 3.125 km 37 GHz H-polarized evening brightness temperature data from Scanning Multi-channel Microwave Radiometer (SMMR), Special Sensor Microwave Image (SSM/I) and Special Sensor Microwave Imager/Sounder (SSMIS) data in the Calibrated Enhanced Resolution Brightness Temperature (CETB) dataset.
lake ice phenology; Passive microwave radiometer; remote sensing; SMMR; SSM/I and SSMIS
Supplement to:
Cai, Yu; Duguay, Claude R; Ke, Chang-Qing (2022): A 41-year (1979–2019) passive-microwave-derived lake ice phenology data record of the Northern Hemisphere. Earth System Science Data, 14(7), 3329-3347,
Original version:
Cai, Yu; Duguay, Claude R; Ke, Chang-Qing (2021): Lake ice phenology in the Northern Hemisphere extracted from SMMR, SSM/I and SSMIS data from 1979 to 2020. PANGAEA,
National Natural Science Foundation of China (NSFC), grant/award no. 41830105
National Natural Science Foundation of China (NSFC), grant/award no. 42011530120
Median Latitude: 49.235036 * Median Longitude: 19.124592 * South-bound Latitude: 30.685780 * West-bound Longitude: -120.612717 * North-bound Latitude: 66.493132 * East-bound Longitude: 132.396644
Lake_01_Great_Bear (Great Bear) * Latitude: 66.213375 * Longitude: -120.612717 * Method/Device: Multiple investigations (MULT)
Lake_02_Great_Slave (Great Slave) * Latitude: 61.708390 * Longitude: -114.007296 * Method/Device: Multiple investigations (MULT)
Lake_03_Dubawnt (Dubawnt) * Latitude: 63.073466 * Longitude: -101.477591 * Method/Device: Multiple investigations (MULT)
This is an updated version of dataset Compared with the old version, we extended the data record to 2021 and added estimated uncertainty of lake ice dates caused by periodical missing data of brightness temperature series.
Date records with uncertainty greater than 7 days were replaced if results from other satellites were available. Visual interpretation was used to obtain the lake ice dates that were failed to be extracted by the automatic algorithm from 1993 to 2021 to ensure the completeness of the records in recent decades.
The uncertainty represents the days of missing data before the freeze-up/break-up dates in the dataset, so they are all negative values. 0 means no missing data before the lake ice dates.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventCai, Yu
2Optional event labelEvent 2Cai, Yu
3Latitude of eventLatitudeCai, Yu
4Longitude of eventLongitudeCai, Yu
5YearsYearsCai, Yuyear
6DateDateCai, Yufreeze-up start
7DateDateCai, Yufreeze-up end
8DateDateCai, Yubreak-up start
9DateDateCai, Yubreak-up end
10Duration, number of daysDurationdaysCai, YuCalculatedcomplete freezing duration, from freeze-up end to break-up start
11Duration, number of daysDurationdaysCai, YuCalculatedice cover duration, from freeze-up start to break-up end
12Ice coverage, maximumIce cov max%Cai, Yupercentage of annual maximum ice cover
13UncertaintyUncertainty±Cai, YuUncertainty [days] of freeze-up start
14UncertaintyUncertainty±Cai, Yuuncertainty [days] of freeze-up end
15UncertaintyUncertainty±Cai, Yuuncertainty [days] of break-up start
16UncertaintyUncertainty±Cai, Yuuncertainty [days] of break-up end
Curation Level: Enhanced curation (CurationLevelC)
22450 data points

Download Data

Download dataset as tab-delimited text — use the following character encoding:

View dataset as HTML (shows only first 2000 rows)