Water vapor profiles retrieved during the POLARSTERN cruises PS122/1 and PS122/2, December 2019, Arctic Ocean

The dataset consists of water vapor profiles including the errors of the Raman lidar measurements performed by the PollyXT_Lidar “Arielle” in the Oceanet container at the bow area of Research Vessel Polarstern from 28 September 2019 till 29 February 2020. The profiles are averaged over 30 s and additionally smoothed with a sliding average over 10 min with the smooth2-function. The vertical averaging is 5 bins (bin-width is 7.5 m; the lidar is pointing with a Zenit angle of 5°). Additionally, signal-to-noise (SNR) ratios of the two signals (H2O and N2) and a quality mask (QM) are provided. The quality mask QM is equal to 1 if the SNR_N2<1 or the SNR_H2O<SNR-threshold (set to 5). The difference of AOD (Aerosol Optical Depth) between 387 nm and 407 nm is not taken into account. For more information about the water vapor calibration (determination of the calibration constant), please go to Dai, G., et al. (2018) and Seidel, C. (2022).

本数据集包含水汽廓线及其对应的拉曼激光雷达(Raman lidar)测量误差，数据采集时段为2019年9月28日至2020年2月29日，采集平台为搭载于“极星号”（Research Vessel Polarstern）科考船艏部区域Oceanet集装箱内的PollyXT型激光雷达“Arielle”。该水汽廓线已进行30秒时长的平均处理，并额外采用smooth2函数以10分钟滑动窗口进行平滑滤波。垂直方向采用5个距离门进行平均，单个距离门宽度为7.5米，激光雷达观测天顶角为5°。此外，本数据集还提供了两路信号（H₂O与N₂）的信噪比(signal-to-noise ratio, SNR)以及质量掩码(quality mask, QM)。当SNR_N2 < 1 或 SNR_H2O小于设定为5的SNR阈值时，质量掩码QM的取值为1。本数据集未考虑387纳米与407纳米波段的气溶胶光学厚度(Aerosol Optical Depth, AOD)差值。如需了解水汽定标（定标常数的确定方法）的更多细节，请参阅Dai, G.等（2018）与Seidel, C.（2022）的相关研究。