Archived Extended Spring Indices Average and Anomaly Products (1981-2010 climate normal)

The Extended Spring Indices are mathematical models that predict the "start of spring" (timing of leaf out or bloom for species active in early spring) at a particular location. The USA National Phenology Network (USA-NPN) hosts a suite of gridded Extended Spring Indices products. In 2022, the USA NPN updated all long-term average and anomaly products in this suite to use the more recent climate normal period (1991-2020).This record contains the archived layers that use the prior normal (1981-2010). The data consists of geotiff rasters with leaf out and bloom dates. The "average" files give leaf and bloom dates as day of year, averaged for the period 1981-2010. The "anomaly" files show for each year 1981-2021, the difference between that year's leaf out or bloom date and the long term average. The products using updated normals can be accessed here: Extended Spring Indices, Continental United States, 1981 - Current YearFor inquiries regarding the contents of this dataset, please contact the Corresponding Author listed in the README.txt file. Administrative inquiries (e.g., removal requests, trouble downloading, etc.) can be directed to [e-mail]扩展春季指数（Extended Spring Indices）是一类数学模型，可用于预测特定地点的“春季起始时间”——即早春活跃物种的展叶或开花时间。美国国家物候网络（USA National Phenology Network, USA-NPN）运维有一套网格化扩展春季指数产品集。2022年，USA-NPN更新了该产品集中的全部长期平均值与距平产品，启用了最新的气候标准期（1991-2020年）。本数据集包含使用旧版气候标准期（1981-2010年）的存档栅格图层。数据采用GeoTIFF栅格格式存储，包含展叶与开花日期信息。"平均值"文件以年积日（day of year）格式记录了1981-2010年期间的平均展叶与开花日期。"距平"文件则展示了1981-2021年各年份的展叶/开花日期与长期平均值的差值。采用更新后标准期的数据集产品可通过以下途径获取：美国本土1981年至今的扩展春季指数。若对本数据集的内容存在疑问，请联系README.txt文件中列出的通讯作者。行政类咨询（例如数据删除申请、下载故障等）请发送邮件至[e-mail]