SBC LTER: CTD profiles from UNOLS cruises in the Santa Barbara Channel: LTER11, 2004-09-08 to 2004-09-16

The data described here were collected on LTER11 which took place from 2004-09-08 to 2004-09-16 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 and RDInstruments Ocean Surveyor 75kHz ADCP.本次描述的数据集采集于LTER11航次，该航次于2004年9月8日至2004年9月16日期间在RV Pt. Sur号科研调查船上完成。自2001年3月起，此类航次每年在美国加利福尼亚州圣巴巴拉海峡开展3至4次，单次航次时长约7天。本数据集包含四类基础测量内容：针对圣巴巴拉海峡长期生态研究项目（Santa Barbara Channel LTER, SBCLTER）专属的25个网格站位的剖面观测，以及7个跨海峡站位的观测（该类站位同时由羽流与水华（Plumes and Blooms）项目布设）；测量内容涵盖初级生产力、基础温盐深剖面仪（Conductivity-Temperature-Depth, CTD）参数（采用Seabird 911-plus型设备采集）、无机营养盐、浮游植物色素、颗粒有机碳与氮、氮及碳同位素天然丰度，部分航次还会增设生物成因硅、陆源成因硅、光学特性及溶解有机碳的测量。在沿岸与跨海峡断面上，通过起伏式拖曳CTD扫描系统（Triaxis）可在表层120米水体中获取海洋组分的二维断面分布数据。走航观测方面：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，该系统同时可开展连续气候观测。走航式声学多普勒海流剖面数据则通过RDInstruments公司的Workhorse 300kHz与Ocean Surveyor 75kHz声学多普勒流速剖面仪（Acoustic Doppler Current Profiler, ADCP）采集获取。