Water vapor profiles retrieved during the POLARSTERN cruise PS122/1, October 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数据，其中涵盖了由PollyXT激光雷达（PollyXT_Lidar）"Arielle"于2019年9月28日至2020年2月29日期间，在极地号科考船（Research Vessel Polarstern）船艏区域的Oceanet集装箱中开展的拉曼激光雷达（Raman lidar）测量误差。该廓线已进行30秒平均处理，并额外通过smooth2函数以10分钟滑动平均进行平滑。垂直平均采用5个距离门（bin），每个距离门宽度为7.5米；激光雷达的观测天顶角为5°。此外还提供了水汽（H₂O）与氮气（N₂）两个信号的信噪比（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取值为1。未考虑387 nm与407 nm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）的更多细节，请参考Dai, G.等人（2018）以及Seidel, C.（2022）的相关研究。