Intercalibrated dataset of in situ dissolved organic matter fluorescence from ice tethered profile 64 in the Central Arctic (2012-2013)

Here we present a merged and calibrated dataset of temperature, practical salinity and dissolved organic matter (DOM) fluorescence obtained from several Ice Tethered Profilers (ITPs) deployed across the central Arctic (2011-2016). The data offer a unique spatial coverage of the distribution of DOM in the surface 800 m below Arctic sea ice. A total of 5044 profiles are gathered. The ITP data are level 3 data products pressure-bin-averaged at 1-db vertical resolution with depth down to either 200 or approximately 750 m. Data (max 800m depth) from CTD casts made during two oceanographic cruises are also included. These were used as part of the calibration and validation of the ITP calibration routines. The cruises were PS94 (ARK-XXIX/3) with POLARSTERN in 2015 and NAACOS with DANA in 2012. The presented DOM fluorescence data are smoothed, corrected for instrument drift and calibrated to provide intercomparable data across the sensors. Fluorescence is reported in Raman Units (nm-1), and comparable to laboratory measurements conducted according to current community recommendations.

本研究公开一套经过整合与校准的数据集，涵盖温度、实用盐度以及溶解有机物（Dissolved Organic Matter, DOM）荧光信号数据，数据来源于2011-2016年间在北极中部海域布放的多台冰系剖面浮标（Ice Tethered Profilers, ITPs）。该数据集实现了北极海冰下方0至800米深度范围内DOM分布的独特空间覆盖。本次共收集到5044条剖面数据。冰系剖面浮标数据属于3级数据产品，以1分巴（db）的垂直分辨率进行压力分档平均，观测深度可达200米或约750米。此外还纳入了两次海洋科考航次中获取的温盐深仪（Conductivity Temperature Depth, CTD）剖面数据，其最大观测深度为800米。这些CTD数据被用于冰系剖面浮标校准流程的校准与验证工作。两次航次分别为2015年搭载极星号（POLARSTERN）的PS94（ARK-XXIX/3）航次，以及2012年搭载达纳号（DANA）的NAACOS航次。本次公开的DOM荧光数据经过平滑处理、仪器漂移校正，并完成校准，以实现不同传感器间数据的可比对性。荧光强度以拉曼单位（Raman Units, nm⁻¹）为单位进行记录，其结果可与当前学界推荐标准下开展的实验室测量结果进行比对。