纳木错湖冰冻融期变化及影响因素数据集

湖冰物候事件是气候变化的敏感指示器。本数据集汇集了西藏纳木错湖冰冻融期变化及影响因素。数据集包括四部分内容：（1）2000-2013纳木错湖冰冻融期数据；（2）2011-2012年纳木错湖冰冻融阶段（10月1-31日，5月1-31日），水下10cm、30cm处日最低水温、湖表面日最低辐射亮温数据；（3）2005-2011年，保吉乡（30o51＇N，90o12＇E）自动气象站每年冬半年均温与纳木错湖每年完全封冻期天数数据；（4）2005-2011年保吉乡1月平均风速与纳木错湖冰每年完全封冻期、开始消融日期数据。数据集中，湖冰冻融期变化数据是采用MODIS每天的可见光反射率产品，根据单波段阈值法确定，使用HJ-1-A卫星目视解译结果对湖冰识别的空间范围进行了验证， 其余数据均为纳木错湖实测数据。在该数据集基础上的分析研究结果（2000-2013年西藏纳木错湖冰变化及其影响因素）已经发表在《地理科学进展》2015年34卷第10期。数据集存储为*.xlsx格式，19KB。

Lake ice phenological events are sensitive indicators of climate change. This dataset compiles the freeze-thaw period variations and influencing factors of Nam Co Lake in Tibet. The dataset includes four parts: (1) Freeze-thaw period data of Nam Co Lake from 2000 to 2013; (2) Data of daily minimum water temperature at 10 cm and 30 cm below the water surface, and daily minimum radiative brightness temperature over the lake surface during the freeze-thaw stages of Nam Co Lake in 2011–2012 (October 1–31, May 1–31); (3) Data of annual mean temperature during the cold half-year from the automatic weather station in Baoji Township (30°51′N, 90°12′E) and annual total days of the full freezing period of Nam Co Lake from 2005 to 2011; (4) Data of January average wind speed in Baoji Township and annual total days of the full freezing period and initial ablation date of Nam Co Lake ice from 2005 to 2011.

Among the dataset, the lake ice freeze-thaw period variation data were determined using daily visible light reflectance products from MODIS via the single-band threshold method, and the spatial extent of lake ice identification was verified using visual interpretation results from the HJ-1-A satellite. The remaining data are all in-situ measured data collected from Nam Co Lake.

Analytical research results based on this dataset, titled *Changes in Lake Ice of Nam Co, Tibet (2000–2013) and Its Influencing Factors*, have been published in *Progress in Geography*, Vol. 34, No. 10, 2015. The dataset is stored in *.xlsx format, with a size of 19 KB.