CTD data collected from MOCNESS hauls on R/V Atlantis II, R/V Knorr, R/V Chain, and R/V Endeavor in the Sargasso Sea, Slope Water and Northern Sargasso Sea from 1974-1981 (NAtlDarkData project)

<p><strong>NOTE: Access to these data has been removed until the new versions of the data are ready. - DMO -10-22-2015</strong></p>

<p>The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of three net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe <em>et al.</em>, 1976). In all three systems, the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds. Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used. Both the temperature and conductivity sensors and the flowmeter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg. Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer. (Wiebe <em>et al.</em>, 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Downwelling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite.</p>

<p><strong>It should be noted that whenever the data are of questionable value, 50.000 is written in the particular data field. </strong></p>

<p>Unless otherwise indicated, these data have not been post-processed.</p>

<p>For additional information, contact the <a href=\"http://globec.whoi.edu/jg/serv/globec/gb/inventory.html0?project,name_prin\"> chief scientist</a> for the cruise or the&nbsp;<a href=\"http://www.bco-dmo.org/contact\">BCO-DMO</a>.</p>

<p><strong>Note:</strong> Some variables have been eliminated from the display or renamed something else, but are nevertheless available. These variables include: id_tag, raw_PR,raw_TE, raw_CO,raw_OT, raw_OC, raw_AN,raw_AN_FL, NR,LI, raw_FL, start_date, end_date, local_end_time, end_year, end_month, end_day, GMT_end_time, end_lat, end_lon, abort_flag, quality_flag, seconds, maybe_PR, maybe_TE, maybe_CO, maybe_AN, and time_zone_info.<br />
Contact the contributors for this information.</p>

<p>These Cold Core Rings data are organized by Cruise and therefore the CruiseID is at the directory level, identified by a lower-case ID, e.g. at85, for Atlantis-II cruise 85.</p>

<p><strong>See individual cruises(below) for acquisition information specific to that cruise.</strong></p>

<p><strong>注意：在新版数据就绪前，本数据集暂不开放获取。——DMO，2015年10月22日</strong></p><p>MOCNESS系统基于塔克拖网（Tucker Trawl）原理（Tucker, 1951）。本次用于获取CTD（Conductivity Temperature Depth，温盐深）数据的MOCNESS系统属于三套网采系统之一。MOCNESS-1型包含9张1m×1.4m的矩形网体，可通过水面传来的导电缆绳指令依次实现开网与闭网操作（Wiebe<em>等人</em>, 1976）。三套系统的水下单元均每2秒向甲板单元发送一组数据帧，数据帧包含温度、深度、电导率、网体框架角度、流量计数、时间、已开网数量及网体开闭状态，以压缩十六进制格式传输；甲板单元则每4秒将数据转发至微型计算机。温度（精度约0.01℃）与电导率由SEABIRD传感器采集，常规配置为改进型T.S.K.流量计。温度传感器、电导率传感器及流量计均安装于框架顶部，当框架以45°拖曳角作业时，这些设备将水平朝向。计算机接收每一组数据串后，将计算盐度（精度约0.01 o/oo S）、位温（θ）、位密（σ）、网体的斜向与垂向运动速度，以及每张网体的近似过滤体积（Wiebe<em>等人</em>, 1985）。此外，框架上还搭载了另外4种传感器：透射仪、荧光计、下行光传感器及溶解氧传感器，传感器套件中还包含一台SeaBird水下泵。</p><p><strong>需注意：当数据质量存疑时，对应数据字段将被赋值为50.000。</strong></p><p>除非另有说明，本数据集未经过后处理。</p><p>如需更多信息，请联系航次首席科学家（<a href="http://globec.whoi.edu/jg/serv/globec/gb/inventory.html0?project,name_prin">chief scientist</a>）或<a href="http://www.bco-dmo.org/contact">BCO-DMO</a>。</p><p><strong>注意：</strong> 部分变量已从显示界面中移除或重命名，但仍可获取。此类变量包括：id_tag、raw_PR、raw_TE、raw_CO、raw_OT、raw_OC、raw_AN、raw_AN_FL、NR、LI、raw_FL、start_date、end_date、local_end_time、end_year、end_month、end_day、GMT_end_time、end_lat、end_lon、abort_flag、quality_flag、seconds、maybe_PR、maybe_TE、maybe_CO、maybe_AN 及 time_zone_info。<br />如需获取此类信息，请联系数据集贡献者。</p><p>本冷芯环（Cold Core Rings）数据集按航次（Cruise）组织，因此航次ID（CruiseID）位于目录层级，由小写ID标识，例如代表第85次亚特兰蒂斯-II号航次的at85。</p><p><strong>详见下方各航次页面，获取对应航次的专属采集信息。</strong></p>