Arctic Western Eurasian Basin: IAOOS 23 physical and biogeochemical profiles in 2017

In April 2017, two Ice Atmosphere Arctic Ocean Observing System platforms (IAOOS 23 and IAOOS 24) were deployed near the North Pole. Over the next 8 months, they meandered southwards with the ice in the Transpolar Drift, collecting measurements in the upper 250 m of Amundsen Basin, Nansen Basin and Fram Strait. The ocean profilers are PROVOR SPI (from French manufacturer NKE), which includes a Seabird SBE41 CTD (Conductivity, Temperature, Depth) and a dissolved oxygen (DO) Aandera 4330 optode. IAOOS 23 also featured a bio-optics sensor suite and a submersible ultraviolet nitrate analyzer (SUNA, Satlantic-Seabird Inc.). The bio-optics sensor suite (called Pack Rem A) combines a three-optical-sensor instrument (ECO Triplet, WET Labs Inc.) and a multispectral radiometer (OCR-504, Satlantic Inc.). The present dataset is composed of chlorophyll-a fluorescence, backscatter, irradiances (at 412, 490 and 555 nm), photosynthetically active radiation (PAR), nitrate and colored-dissolved organic matter data from the IAOOS 23 platform, as well as composites of absolute salinity, conservative temperature and apparent oxygen utilization data from both profilers. The profilers were set to perform two upward profiles a day from 250 m starting at approximately 6 am and 6 pm. In this dataset, chlorophyll-a, PAR and irradiances were corrected with a shift to set dark values to zero. Nitrate was interpolated vertically every 5 m, and all other parameters were interpolated vertically every 0.5 m.

2017年4月，两台冰-大气-北冰洋观测系统（Ice Atmosphere Arctic Ocean Observing System，以下简称IAOOS）平台（IAOOS 23与IAOOS 24）在北极附近布放。在随后的8个月中，它们随浮冰在跨极漂流带（Transpolar Drift）向南漂移，采集了阿蒙森海盆（Amundsen Basin）、南森海盆（Nansen Basin）与弗拉姆海峡（Fram Strait）上层250米水体的观测数据。本次搭载的海洋剖面浮标为法国制造商NKE生产的PROVOR SPI型浮标，其集成了海鸟（Seabird）SBE41型温盐深传感器（Conductivity, Temperature, Depth，简称CTD）以及溶解氧（DO）Aandera 4330型光极传感器。其中IAOOS 23还搭载了生物光学传感器套件与水下紫外硝酸盐分析仪（SUNA，Satlantic-Seabird Inc.）。该生物光学传感器套件（命名为Pack Rem A）整合了三光学传感器仪器（ECO Triplet，WET Labs Inc.）与多光谱辐射计（OCR-504，Satlantic Inc.）。本数据集包含IAOOS 23平台采集的叶绿素a荧光、后向散射、412 nm、490 nm与555 nm波段辐照度、光合有效辐射（Photosynthetically Active Radiation，简称PAR）、硝酸盐以及有色溶解有机物数据，同时包含两台剖面浮标采集的绝对盐度、保守温度与表观氧利用量数据的合成数据集。剖面浮标设定为每日执行两次上行剖面观测，起始深度为250米，观测时段约为每日早6点与晚6点。本数据集已对叶绿素a、光合有效辐射与辐照度数据开展暗值归零校正；硝酸盐数据以每5米间隔进行垂直插值，其余参数则以每0.5米间隔进行垂直插值。