SCOPE-Falkor - FK180310 - LISST Profiles

These Simons Collaboration on Ocean Processes and Ecology (SCOPE) data products were produced by the University of Hawaiʻi at Mānoa with support from the Simons Foundation. The 2018 SCOPE-Falkor Cruise north of Oahu, Hawaii, built on the observations of the SCOPE expeditions conducted during 2015-2017 by looking at diel variability associated with the deep chlorophyll maximum and quantifying the impact of mesoscale eddies on the ecology and functioning of the North Pacific Subtropical Gyre. A unique aspect to the expedition was the use of Long-Range Autonomous Underwater Vehicles (LRAUVs) which were integrated into the science operations in conjunction with other oceanographic equipment. All LISST data were collected with a LISST-100X Type-B instrument operated in profiling mode. The angular range (median of bin) of the LISST Type-B is 0.106-17.96 degrees, and the size classes sensed are 1.44 - 231 microns (median of each size bin), albeit only particles less than 100 µm are considered here. All data have been corrected for background scattering of a clean filtered water calibration. The summed volume concentration of particles (in µL/L), the standard LISST output, is presented for 3 size ranges: 1.25-2 µm, 2-20 µm, and 20-100 µm. Particle volume concentration is then converted to particle concentration (#/L) by assuming spherical particles for particles with a diameter between 1.25 and 100 µm. Larger size classes are excluded due to low detection limits. Note that data have not been processed to remove outliers. The data have been binned to depth at 2m increments, and the latitude/longitude is generalized to the cast's time stamp and may not match the ship's position exactly. The timestamp is in UTC.本数据集为西蒙斯海洋过程与生态合作研究（Simons Collaboration on Ocean Processes and Ecology, SCOPE）的数据产品，由夏威夷大学马诺阿分校制作，西蒙斯基金会提供资助。 2018年在夏威夷瓦胡岛以北开展的SCOPE-Falkor航次，以2015-2017年SCOPE考察队的观测数据为基础，重点探究与深层叶绿素极大值相关的昼夜变化特征，并量化中尺度涡旋对北太平洋副热带环流生态系统结构与功能的影响。本次考察的一大特色是将远程自主水下航行器（Long-Range Autonomous Underwater Vehicles, LRAUVs）与其他海洋学设备整合至科学作业流程中。 所有LISST（LISST）数据均采用剖面模式运行的LISST-100X Type-B仪器采集。LISST Type-B的角度探测范围（测箱中位数）为0.106~17.96度，可探测的粒径区间为1.44~231微米（各粒径测箱的中位数粒径），但本次研究仅纳入粒径小于100微米的颗粒。所有数据均已针对洁净过滤水校准得到的背景散射效应完成校正。LISST的标准输出结果——颗粒总容积浓度（单位：µL/L）——按3个粒径区间进行展示：1.25~2微米、2~20微米及20~100微米。随后，针对1.25~100微米粒径范围内的颗粒，假设其为球形，将颗粒容积浓度转换为颗粒数浓度（单位：#/L）。由于检测限较低，更大粒径区间的颗粒数据被排除。请注意，本数据集未经过异常值剔除处理。数据已按2米间隔对深度进行分箱处理，经纬度信息已根据测次的时间戳进行概化，可能与船舶实际位置存在小幅偏差。时间戳采用协调世界时（UTC）。