Annual river ice phenologies determined by IDLRM from 2000 to 2021

<b>*Title:</b>Annual river ice phenologies determined by IDLRM from 2000 to 2021.<br><b>*Description:</b>These tables document the annual freeze-up date, break-up date, and ice duration for 7,970 examined river segments determined by IDLRM from 2000 to 2021 in the study.The first column "river_id" is associated with unique identifiers for rivers in the Global River Widths from Landsat (GRWL) dataset. For example, "NH44_109" indicates a river in the latitude range of 28-32°N and the longitude range of 78-84°E, with an ID of "109". Further details are available at: https://zenodo.org/records/1297434#.W8JkshNKh24.The remaining columns represent the corresponding river ice phenologies for each year. For freeze-up and break-up dates, the values in the table indicate the day of the year when freezing/breaking occurred, starting from August 1st of the previous year. For ice duration, the values in the table represent the number of days the river was frozen during the respective year. Blank entries indicate either no ice formation in the river during the year or inability of the model to determine the ice conditions.

<b>*标题:</b>2000年至2021年基于IDLRM反演的年度河流冰情物候数据集<br><b>*描述:</b>本数据集包含本研究中2000年至2021年间通过IDLRM方法反演得到的7970条研究河段的年度封冻日期、解冻日期及冰期时长信息。数据集第一列"river_id"为全球Landsat河流宽度数据集（Global River Widths from Landsat, GRWL）中河流的唯一标识符。例如，标识符"NH44_109"代表位于北纬28°-32°、东经78°-84°范围内、编号为"109"的河流。更多详细信息可查阅：https://zenodo.org/records/1297434#.W8JkshNKh24。其余各列分别对应各年份的河流冰情物候参数。其中封冻日期与解冻日期的字段值为事件发生时的年积日，计时起点为前一年的8月1日；冰期时长的字段值为对应年份河流的封冻总天数。表格中的空值代表该年度河流未形成冰盖，或模型无法准确反演该年度的冰情条件。