Integrated daily Photosynthetically Available Radiation (PAR) data from RVIB Nathaniel B. Palmer cruises NBP0103, NBP0104, NBP0202, and NBP0204 in the Southern Ocean from 2001-2002 (SOGLOBEC project)

<h3>Photosynthetically Available Radiation (PAR) Data<br />
from broadscale cruises NBP0103, NBP0104, NBP0202 and NBP0204</h3>

<p><strong>Instrument Notes:</strong><br />
Biospherical Instruments GUV-500 is a 5-channel reference radiometer which typically measures cosine-corrected down welling irradiance at 305, 320, 340, 380nm and PAR (400-700nm). Cosine irradiance (EsPAR) sensors collect light impinging on a Teflon-coated diffuser and the response is proportional to the cosine of the angle of incidence.</p>

<p>Biospherical Instruments QSR250 system measures a single channel of scalar irradiance (PAR) and is appropriate for applications independent of the directionality of the light field, such as measurements of the flux available for photosynthesis.<br />
<em>-- Biospherical Instruments </em></p>

<p><strong>Data Notes: </strong><br />
1. The cosine PAR value for yrday_gmt 151 year 2001 is an estimate, based on a conversion from data recorded by the QSR240 scalar sensor package.<br />
2. Latitude and longitude have been added to this data set by the Data Management Office. These positions are the noon (12:00 hour) positions reported in the ship's alongtrack data set.<br />
3. Scalar PAR data was extracted from the ship's alongtrack meteorological data set. The sensor package was mounted on ship's science mast.</p>

<p><strong>Methods:</strong><br />
For additional information on methods see the on-line cruise reports, (Primary Production Sections) <a href=\"http://globec.whoi.edu/so-dir/reports/nbp0103/nbp0103.html\">nbp0103</a>, <a href=\"http://globec.whoi.edu/jg/serv/globec/soglobec/inventory.html2%7Bdir=globec.whoi.edu/jg/dir/globec/soglobec/,info=globec.whoi.edu/jg/info/globec/soglobec/inventory%7D?project%20eq%20NBP0104,data_type%20eq%20cruise_report\">nbp0104 </a>, <a href=\"http://globec.whoi.edu/so-dir/reports/nbp0202/nbp0202b.html#TOC1_6\">nbp0202</a>, and <a href=\"http://globec.whoi.edu/so-dir/reports/nbp0204/nbp0204b.html#TOC1_8\">nbp0204</a>.</p>

<p><strong>Data contributed by:</strong><br />
Maria Vernet<br />
Integrative Oceanographic Division<br />
Scripps Institution of Oceanography<br />
University of California San Diego<br />
La Jolla, California 92093-0218</p>

<p>Phone: [phone]<br />
E-mail: <a href=\"mailto:[e-mail]\">[e-mail]</a></p>

<p><em>Last updated: December 09, 2005; gfh</em></p>