CTD data from the CMarZ 10m2 MOCNESS tows and ancillary tow info from NOAA Ship Ronald H. Brown and R/V Polarstern in the Sargasso Sea and Southeast North Atlantic Ocean from 2006-2007 (CMarZ_2004-2010 project)

<p>The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The MOCNESS-10 (with 10 m² nets) used for the Census of Marine Life has 1 net of 3.0-mm circular mesh and 4 nets of .333-mm mesh which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe <i>et al.</i>, 1976). In all three systems, &quot;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.&quot; (Wiebe <i>et al.</i>, 1985) In addition, data were collected from three other sensors attached to the frame: the Transmissometer, the Fluorometer, and the Downwelling light sensor. A SeaBird underwater pump was also included in the sensor suite.</p>
<p><b> It should be noted that whenever the data are of questionable value, &quot;50.000&quot; was written in the particular data field. As of July 22, 2008, these values are converted to the value of &quot;nd&quot; (meaning &quot;no data&quot;). If the value of temperature is set to &quot;nd&quot;, then the values of theta, sigma and sal are also set to &quot;nd&quot;. If the value of salinity is set to &quot;nd&quot;, then the value of sigma is set to &quot;nd&quot;. Also, as of July 22, 2008, values of latitude and longitude of -999.00000 are also changed to &quot;nd&quot;. </b></p>
<p>Unless otherwise indicated, these data have not been post-processed.</p>
<p><b>Note:</b> Some variables have been eliminated from the display because they were not collected on this cruise or are redundant but are nevertheless available. These variables include: oxycurrent, oxytemp, tempco, echo, time_gmt_alt; lite; station_std; brief_desc; tvel.</p>
<p>Any questions should be directed to the <a href="%22http://www.cmarz.org/contact_dmo.html%22">CMarZ Data Management Office.</a></p>
<h2>References</h2>
<p>Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44</p>
<p>&nbsp;</p>
<p>Tucker, G.H., 1951. Relation of fishes and other organisms to the scattering of underwater sound. <i> Journal of Marine Research</i>, <b>10:</b> 215-238.</p>
<p>Wiebe, P.H., K.H. Burt, S. H. Boyd, A.W. Morton, 1976. The multiple opening/closing net and environmental sensing system for sampling zooplankton. <i>Journal of Marine Research</i>, <b>34(3):</b> 313-326</p>
<p>Wiebe, P.H., A.W. Morton, A.M. Bradley, R.H. Backus, J.E. Craddock, V. Barber, T.J. Cowles and G.R. Flierl, 1985. New developments in the MOCNESS, an apparatus for sampling zooplankton and micronekton. <i>Marine Biology</i>, <b>87:</b> 313-323.</p>

<p>海洋观测网系统（MOCNESS）基于塔克拖网原理（Tucker, 1951）。用于海洋生物普查的MOCNESS-10（配备10平方米的网）装备了1个3.0毫米圆形网孔网和4个0.333毫米网孔网，这些网通过表面传导电缆的指令依次打开和关闭（Wiebe等，1976）。在三个系统中，'水下单元每2秒向甲板单元发送一个数据帧，该数据帧包含温度、深度、电导率、网框角度、流量计数、时间、开启网数以及网的开闭状态，并以压缩的十六进制格式发送；每4秒从甲板单元发送到微型计算机...温度（精确到约0.01°C）和电导率使用SEABIRD传感器进行测量。通常，采用改进的T.S.K.流量计...温度和电导率传感器以及流量计均安装在框架顶部，以便在框架拖曳角度为45度时水平面对...在计算机接收到每串数据后，进行盐度（精确到约0.01‰）、潜在温度（theta）、潜在密度（sigma）、网的斜向和垂直速度，以及每个网过滤的大约体积的计算。”（Wiebe等，1985）此外，还收集了安装在框架上的三个其他传感器的数据：透射计、荧光计和向下光照传感器。传感器套件还包括SeaBird水下泵。</p><p><b>需要注意的是，当数据值可疑时，在特定数据字段中写入“50.000”。截至2008年7月22日，这些值被转换为“nd”（意为“无数据”。如果温度值设置为“nd”，则theta、sigma和盐度的值也设置为“nd”。如果盐度值设置为“nd”，则sigma的值也设置为“nd”。此外，截至2008年7月22日，经纬度值为-999.00000也被更改为“nd”。</b></p><p>除非另有说明，否则这些数据未经后处理。</p><p><b>注意：</b>一些变量已被从显示中删除，因为它们在本次航行中未收集或冗余，但仍然可用。这些变量包括：氧流、氧温、温差、回波、GMT时间；光度；站标准；简要描述；Tvel。</p><p>有关任何问题，请联系<a href="%22http://www.cmarz.org/contact_dmo.html%22">CMarZ数据管理办公室。</a></p><h2>参考文献</h2><p>Fofonoff和Millard，1983，联合国教科文组织海洋科学技术论文，第44号</p><p>&nbsp;</p><p>塔克，G.H.，1951.鱼类和其他生物与水下声波散射的关系。《海洋研究杂志》，第10卷：215-238。</p><p>Wiebe，P.H.，K.H. Burt，S. H. Boyd，A.W. Morton，1976.多重开启/关闭网和环境传感系统用于浮游动物采样。《海洋研究杂志》，第34卷第3期：313-326。</p><p>Wiebe，P.H.，A.W. Morton，A.M. Bradley，R.H. Backus，J.E. Craddock，V. Barber，T.J. Cowles和G.R. Flierl，1985.海洋观测网系统（MOCNESS）的新进展，一种用于采样浮游动物和微型浮游动物的装置。《海洋生物学》，第87卷：313-323。</p>