Annual growth of Laternula elliptica shells from Dumont d'Urville Station (Adélie Land, East Antarctica)

Laternula elliptica is one of the largest bivalve mollusk in Antarctic waters. Its shell presents annual growth increments that can be crossdated for the construction of master chronologies. Inter-annual variations of the resulting growth indices are driven by environmental forcings, among which sea ice and sympagic algae dynamics are the main ones. These two datasets present shell growth data collected in cross-sections of chondrophores (hinge area) of 27 Laternula elliptica specimens harvested by SCUBA diving near Dumont d'Urville Station (Adélie Land, East Antarctica) in January 2016. A calendar year was assigned to each annual growth increment by visual crossdating backward from the sampling year. Growth increment widths, expressed in micrometers, were measured from the last deposited growth increment (margin) toward earlier growth years (raw increment width µm file). Each individual time-series of growth increment width was first power-transformed, then detrended with a negative exponential function to compute two time-series of annual growth indices, with or without prewhitening by fitting an autoregressive model (growth indices file).椭圆蛤（Laternula elliptica）是南极海域体型最大的双壳软体动物（bivalve mollusk）之一。其壳体具有年生长增量，可通过交叉定年法构建主年代序列。所得生长指数的年际变化受环境强迫因子驱动，其中海冰与冰藻（sympagic algae）动力学过程为主要影响因素。本两套数据集涵盖2016年1月在南极东部阿黛利地迪蒙·迪维尔站附近通过水肺潜水采集的27个椭圆蛤个体的铰合部软骨突（chondrophores）切片的壳体生长数据。研究人员通过从采样年份反向开展目视交叉定年，为每个年生长增量匹配对应日历年。生长增量宽度以微米为单位，从最新沉积的生长增量（壳体边缘）向更早的生长年份进行测量（原始增量宽度微米数据文件）。每条独立的生长增量宽度时间序列首先经幂变换处理，随后通过负指数函数完成去趋势分析，以此生成两组年生长指数时间序列：一组通过拟合自回归模型进行预白化处理，另一组未进行预白化处理（生长指数数据文件）。