SBC LTER: CTD profiles from UNOLS cruises in the Santa Barbara Channel: LTER09, 2004-02-24 to 2004-03-04

The data described here were collected on LTER09 which took place from 2004-02-24 to 2004-03-04 on the RV Pt. Sur. Cruises have been conducted in the Santa Barbara Channel, California, USA, 3-4 times per year since March, 2001 and are approximately 7 days in length. There are 4 basic types of measurements: Profiles at 25 grid stations unique to the SBCLTER and 7 cross-channel stations (also occupied by the Plumes and Blooms project). Measurements include primary production, basic CTD parameters (Seabird 911-plus), inorganic nutrients, phytoplankton pigments, particulate organic carbon and nitrogen, natural abundances of N and C isotopes, and occasionally biogenic and lithogenic silica, optics, and/or dissolved organic carbon. Two-dimensional sections of oceanic constituents are recorded in the top 120m with an undulating towed CTD scanning system (Triaxis) on both along shore and cross-channel transects. Underway measurements: fluorometry, salinity and temperature are collected at a depth of 3m with a flow-through system which also includes continuous climate measurements. Underway acoustic dopler current profiles were collected using a RDInstruments Workhorse 300kHz ADCP. On Cruise LTER09, additional CTD samples were collected to document brown water at the mouth of the Ventura River after a rain event. On this cruise, additional stations and are identified as VenturaPlume

本数据集采集自LTER09航次，该航次于2004年2月24日至2004年3月4日在研究船瑟斯角号（RV Pt. Sur）上开展。本项目自2001年3月起，在美国加利福尼亚州圣巴巴拉海峡每年开展3-4次航次，单次航次时长约7天。
本数据集包含4类基础测量内容：其一为25个圣巴巴拉海峡长期生态研究（SBCLTER）专属网格站位的剖面测量，以及7个跨海峡站位的剖面测量（该类站位同时由“羽流与水华”项目（Plumes and Blooms project）布设使用）。测量指标涵盖初级生产力、温盐深（Conductivity-Temperature-Depth, CTD）参数（Seabird 911-plus型CTD）、无机营养盐、浮游植物色素、颗粒有机碳与颗粒有机氮、氮及碳同位素自然丰度，偶尔还会额外测量生源硅与陆源硅、光学特性及溶解有机碳。
科研人员利用起伏式拖曳CTD扫描系统（Triaxis），在沿岸及跨海峡断面上对表层120米范围内的海洋组分开展二维断面观测。
走航测量方面：采用流通式系统在3米水深处采集荧光强度、盐度与温度数据，该系统可同步开展连续气候观测；走航声学多普勒流速剖面数据则通过RD仪器公司（RDInstruments）的Workhorse 300kHz声学多普勒流速剖面仪（ADCP）采集。
在LTER09航次中，为记录降雨事件后文图拉河河口的“棕水”现象，科研人员额外采集了CTD样品；本次航次新增的站位被标记为文图拉羽流站（VenturaPlume）。