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]

扩展春季指数是预测特定地点“春季开始”（指早期春季活跃物种的发芽或开花时间）的数学模型。美国国家物候网络（USA-NPN）提供了一系列网格化的扩展春季指数产品。在2022年，美国国家物候网络更新了该系列中所有长期平均值和异常值产品，以使用更近期的气候标准期（1991-2020）。本记录包含了使用先前标准期的存档图层。数据由叶发芽和开花日期的地理TIFF栅格组成。‘平均值’文件提供了1981-2010期间的叶和开花日期，以年为单位进行平均。‘异常值’文件显示了1981-2021年每年的叶发芽或开花日期与长期平均值之间的差异。使用更新标准的产品可以在此访问：扩展春季指数，美国大陆，1981年至今。如需查询本数据集的内容，请联系README.txt文件中列出的对应作者。行政查询（例如，移除请求、下载问题等）可发送至[e-mail]。