Oceanographic data and ROV dive-related multimedia and information collected during the EX1504L4 (Campaign to Address Pacific monument Science, Technology, and Ocean NEeds (CAPSTONE) Leg IV) expedition on NOAA Ship OKEANOS EXPLORER in the North Pacific Ocean from 2015-09-07 to 2015-09-30 (NCEI Accession 0131887)

This dataset contains oceanographic data collected in the deep waters in and around Papahānaumokuākea Marine National Monument (PMNM) in the Northwestern Hawaiian Islands and Johnston Atoll. The primary goal for this cruise was to collect baseline data and information to support priority NOAA science and management needs. The expedition is part of a three-year Campaign of Expeditions (Campaign to Address Pacific monument Science, Technology, and Ocean NEeds or CAPSTONE) focused on exploring deepwater marine protected areas in the Pacific. Operations for this cruise included the 24-hour collection of ship navigation data and scientific computing system data, which comprises of meteorological and oceanographic sensor data, as well as water column profile data. The ship also conducted daytime ROV dives that focused in depths between 250 and 6,000 meters, and included high-resolution visual surveys and biological/geological sample collections. Opportunistic CTD rosette operations were completed to collect more information about the environmental parameters at ROV dive sites where collecting the data is considered important to understanding the physical or chemical properties of the overlying water column.

本数据集涵盖在夏威夷西北群岛的帕帕哈瑙莫夸基亚国家海洋保护区（Papahānaumokuākea Marine National Monument，PMNM）及其周边深水海域，以及约翰斯顿环礁区域采集的海洋学数据。本次远征科考的核心目标是采集基准数据与相关信息，以支持美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）优先的科学研究与管理需求。本次活动属于为期三年的远征科考计划——“应对太平洋保护区科学、技术与海洋需求运动（Campaign to Address Pacific monument Science, Technology, and Ocean NEeds，简称CAPSTONE）”的组成部分，该计划聚焦探索太平洋深水海洋保护区。本航次的作业内容包括24小时不间断采集船舶导航数据与科学计算系统数据，此类数据涵盖气象与海洋学传感器数据以及水柱剖面数据。此外，科考船还开展了日间遥控无人潜水器（Remotely Operated Vehicle，ROV）下潜作业，作业水深覆盖250米至6000米区间，包含高分辨率视觉勘测与生物、地质样本采集工作。针对ROV下潜站点，本次航次还完成了机会性温盐深采水器（CTD rosette）作业，以获取更多环境参数信息，这类数据对于解析上覆水柱的物理与化学特性具有重要意义。