[RAW VALIDATED DATA] Photosynthetically Active Radiation (PAR) measurements from a Biospherical Instrument Inc. QCR-2150 surface PAR sensor mounted on a sensor mast during the Tara Oceans expedition 2009-2013@en

The Tara Oceans Expedition (2009-2013) sampled the world oceans on board a 36 m long schooner, collecting environmental data and organisms from viruses to planktonic metazoans for later analyses using modern sequencing and state-of-the-art imaging technologies. Tara Oceans Data are particularly suited to study the genetic, morphological and functional diversity of plankton. The present data set provides raw validated data of continuous measurements made with a Biospherical Instrument Inc. QCR-2150 surface PAR sensor mounted on a sensor mast at the stern of the ship (ca. 8m above deck) and time synchronized with the CTD recording unit. The sensor consists of a cosine collector and was also utilized to correct the CTD PAR sensor data. The dark was computed as the lowest 0.01% voltage of the signal that was found to be very stable (0.00965V) for all the legs except for the 2nd leg of the polar circle where there was no complete night (the manufacturer dark was 0.0097V). The manufacturer calibration slope from 12/ 2012 was used to transform the data to scientific units.

塔拉海洋探险队（Tara Oceans Expedition）于2009至2013年间，搭乘总长36米的纵帆船对全球海洋开展系统性采样，收集了涵盖病毒至浮游后生生物的各类生物体与环境数据，以供后续依托现代测序与顶尖成像技术开展分析研究。
塔拉海洋数据集尤其适用于探究浮游生物的遗传、形态及功能多样性。
本数据集提供了由生物球面仪器公司（Biospherical Instrument Inc.）QCR-2150型表层光合有效辐射（Photosynthetically Active Radiation, PAR）传感器采集的经校验的连续实测原始数据。该传感器安装于船尾传感器桅杆上（距甲板约8米），并与温盐深（Conductivity, Temperature, Depth, CTD）记录单元实现时间同步。传感器搭载余弦采光头，同时也被用于校正温盐深仪的光合有效辐射传感器数据。
暗值以信号中最低的0.01%电压计算得出：除极圈航线第二段（该区域无完整黑夜时段）外，其余所有航段的暗值均极为稳定（0.00965V），厂商提供的标准暗值为0.0097V。本数据集采用2012年12月厂商提供的校准斜率，将原始数据转换为科学计量单位。