Ring width chronolgies (N=91) from the three boreal forest tree species and shrub (alder) across a bioclimatic gradient in western Alaska at the lower Seward Peninsula sampled in 2024@en

The data set consists of tree ring width chronologies from tree species. The samples were taken with an increment borer predominantly from the north of the tree at breast height (1.3 m above ground) and were dried in the field. In Potsdam, we sanded, digitized and further processed the scans by identifying the ring layers (from bark to pith and including or estimating the centre) and exporting the tree ring width for each year in one data file. By crossdating we checked against other tree ring width chronologies from the same site for missing rings and corrected them. The data containing files in dendrochronological TUCSON format (1/100 mm) are added in the Metadata-section as \"other version\". The region covered is part of the Northern Boreal Forest and the Tundra-Taiga Ecotone (TTE). The fieldwork was planned and carried out by researchers from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) and the University of Alaska Fairbanks (UAF). It took place in the summer of 2024, from 18 June to 17 July. The study area covers boreal forests in different bio-climatic regions and revisits sites established in 2023 and adds more sites. Additionally, the Tundra-Taiga Ecotone was sampled at the Seward Peninsula from the westernmost forests in Alaska close to the settlement of Council and towards Nome.本数据集包含源自多种树木的树轮宽度年表。样本主要采用树木生长锥（increment borer）于树干胸高位置（距地面1.3米）的北侧采集，并在野外完成干燥处理。在波茨坦（Potsdam），研究人员对扫描样品进行打磨、数字化操作，并通过识别年轮层（从树皮至髓心，包含或估算髓心中心点）完成后续处理，随后将每一年的树轮宽度数据导出至单个数据文件中。通过交叉定年（crossdating）技术，研究人员对照同一采样点的其他树轮宽度年表排查漏失年轮并完成修正。以树轮年代学（dendrochronological）标准TUCSON格式（精度为1/100毫米）存储的数据文件，将作为「其他版本」添加至元数据（Metadata）部分。本数据集覆盖的区域属于北部寒带针叶林（Northern Boreal Forest）与苔原-泰加林交错带（Tundra-Taiga Ecotone, TTE）的一部分。本次野外作业由阿尔弗雷德·魏格纳研究所、亥姆霍兹极地与海洋研究中心（Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, AWI）以及阿拉斯加大学费尔班克斯分校（University of Alaska Fairbanks, UAF）的研究人员规划并实施，于2024年夏季（6月18日至7月17日）开展。研究区域涵盖不同生物气候区的寒带针叶林，对2023年已设立的样地进行了重访，并新增了多个样地。此外，研究团队在苏华德半岛（Seward Peninsula）的阿拉斯加最西部森林区域——临近Council定居点并朝向诺姆（Nome）的地带，完成了苔原-泰加林交错带的采样工作。