Particle mean size, particle size distribution, and volume size distribution from a profiling LISST DEEP collected during CTD casts at stations during the Northern Gulf of Alaska LTER seasonal cruises, 2018 and 2019

This data set contains particle mean size, abundance, and volume size distributions for particles within two size ranges 1.25-250 microns (type B) and 2.5-500 microns (type C). These measurements were collected by a LISST-Deep on a CTD rosette lowered from a ship at discrete stations during cruises for the Northern Gulf of Alaska Long Term Ecological Research (NGA LTER) project. The LISST-Deep estimates particle size distribution (PSD) by inverting scattering intensities measured over a range of small angles on a multi-ring detector. Measurement range for type B is 1.25 µm to 250µm (WSD201807, TGX201904, SKQ201915S, TGX201909) and type C is 2.5µm to 500µm (SKQ201810S). This dataset also contains a zip file containing one txt file of supplemental data for each csv. These txt files describe the size classes and the background data used in the corresponding csv. The LISST-Deep (Serial Number 4025, manufactured by Sequoia Scientific, Inc.) collected data during the spring and summer 2018 cruises, and during the spring, summer, and fall 2019 cruises. During the fall 2019 cruise (TGX201909), a depth offset in the instrument rendered data within the first ~300 meters of the water column unrecoverable.

本数据集涵盖两类粒径区间内的颗粒平均粒径、丰度及体积粒径分布数据：B型颗粒的粒径范围为1.25~250微米，C型颗粒为2.5~500微米。所有测量数据由LISST-Deep仪器搭载于温盐深仪（CTD）采水罗塞塔系统（Rosette）获取，采集工作依托阿拉斯加北湾长期生态研究（Northern Gulf of Alaska Long Term Ecological Research, NGA LTER）项目的航次，在船舶下放的离散站位开展。LISST-Deep通过反演多环探测器在小角度范围内测得的散射强度，估算颗粒粒径分布（Particle Size Distribution, PSD）。其中B型颗粒的测量范围为1.25μm至250μm，对应航次编号为WSD201807、TGX201904、SKQ201915S及TGX201909；C型颗粒的测量范围为2.5μm至500μm，对应航次编号为SKQ201810S。本数据集还包含一个ZIP压缩包，其内每份CSV数据文件均配套一份补充说明TXT文件，用于描述对应CSV所采用的粒径分级方案及背景校正数据。本次使用的LISST-Deep仪器（序列号4025，Sequoia Scientific, Inc.制造）分别在2018年春夏季航次、2019年春夏季及秋季航次中完成数据采集。在2019年秋季航次（TGX201909）中，因仪器出现深度偏移故障，水柱前约300米深度范围内的采集数据无法恢复。