Seward Line CTD Data

The Northern Pacific appears to have undergone a “regime shift” within the past bimodal state that is not typical
of previously studied regimes. Regime shifts are often fundamental shifts in ecosystem structure and function, such as the 1976 regime shift
change from a shrimp dominated fisheries to one dominated by pollock, salmon and profound impact potential, this proposal seeks to provide
observations of the current Gulf of Alaska during 2005.
The current dataset represent the CTD data collected by Dr. Tom Weingartner of the Institute of Marine Science, University of Alaska Fairbanks
for the Gulf of Alaska LTOP (Long Term Observation Project). The area of coverage is the Gulf of Alaska.The name of the dataset
corresponds with the name of the cruise; TN179 cruise took place during May, 2005, TXF05 September, 2005, TN194 during May, 2006, TXF06 September, 2006,
TXS07 May, 2007, TXF07 September, 2007.
All data is packed into holders that corresponds to names of cruises and each folder contains three files:
1. Header information is stored in [name of the4 cruise]hdr.dat
2. CTD data is stored in [name of the cruise]s.dat.
3. [name of the cruise]s.readme that holds brief information on the data. These datasets were archived as part of the North Pacific Research Board legacy project recovery effort undertaken by Axiom Data Science and NPRB in 2025. The goal of the recovery effort was to assess the NPRB-funded data projects from 2002 to 2014 and archive final data packages that were ready for publication to increase long-term accessibility and discoverability. Data packages were archived as is given limited funding and resources.

北太平洋似乎在过去的双峰态阶段发生了一次“生态系统态转换（regime shift）”，这与此前已研究的态转换特征并不典型。生态系统态转换通常指生态系统结构与功能的根本性转变，例如1976年的态转换：渔业从以虾类为主导转变为狭鳕、鲑鱼主导，且具备极强的潜在影响。本项目旨在获取2005年阿拉斯加湾的现场观测数据。
本数据集为阿拉斯加费尔班克斯大学海洋科学研究所汤姆·温加特纳博士为阿拉斯加湾长期观测项目（Long Term Observation Project, LTOP）所采集的温盐深剖面仪（CTD）数据，覆盖范围为阿拉斯加湾。数据集名称与航次名称一一对应：TN179航次于2005年5月执行，TXF05航次于2005年9月执行，TN194航次于2006年5月执行，TXF06航次于2006年9月执行，TXS07航次于2007年5月执行，TXF07航次于2007年9月执行。
所有数据按航次名称打包存储，每个航次文件夹包含3个文件：1. 航次头文件信息存储于[航次名称]hdr.dat；2. 温盐深剖面仪数据存储于[航次名称]s.dat；3. [航次名称]s.readme文件包含该数据集的简要说明。本数据集作为北太平洋研究委员会（North Pacific Research Board, NPRB）遗留项目修复工作的一部分，由Axiom Data Science与NPRB于2025年完成归档。本次修复工作的目标为评估2002至2014年间由NPRB资助的各类数据项目，并将已具备发表条件的最终数据包进行归档，以提升数据的长期可获取性与可发现性。鉴于资金与资源有限，本次归档将保留数据的原始状态。