<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Andrew<div class=""><br class=""></div><div class="">1) 2 cases:</div><div class="">i) If you are using the external forcing package (EXF) and the sea ice package it uses the short wave flux calculated by these packages as long as you have </div><div class="">#define USE_EXFQSW in BLING_OPTIONS.h</div><div class="">This does take into account sea ice cover</div><div class=""><br class=""></div><div class="">ii) If you are not using EXF (or BLING_OPTIONS has #undef USE_EXFQSW) then it simply takes light based on calendar day and neglects the influence of sea ice. You could make it account for ice in this case by uncommenting </div><div class="">cav irr_surf(i,j) = irr_surf(i,j)*(1. _d 0 - FIce(i,j,bi,bj))<br class=""></div><div class="">in bling_light.F to make it dark under ice…or do something more sophisticated if you want. (Here FIce is the ratio of ice cover in the cell.)</div><div class=""><br class=""></div><div class="">2) BLING does not take self-shading by biomass into account. </div><div class=""><div><br class=""></div><div>Hope this helps!</div><div>-Matt</div><div><br class=""></div><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 27, 2018, at 4:16 AM, Andrew Twelves <<a href="mailto:agt_94@hotmail.co.uk" class="">agt_94@hotmail.co.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;" class=""><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span lang="EN-US" class="">Morning all,</span></div><p class="x_x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;"><span lang="EN-US" class=""> </span></p><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span lang="EN-US" class="">I am about to start biogeochemical modelling using the BLING package, and have a couple of questions regarding the treatment of light availability:</span></div><p class="x_x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;"><span lang="EN-US" class=""> </span></p><ol start="1" type="1" style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px; margin-top: 0cm;" class=""><li class="x_x_MsoNormal"><span lang="EN-US" class="">Does BLING by default set light penetration to zero underneath sea ice, or does it allow for limited penetration subject to a strong attenuation coefficient? If the latter, does BLING take the value of effective sea ice thickness HEFF directly from the Sea Ice package, or does it do something more sophisticated (like a sub-grid scale parametrization of the thickness distribution)?</span></li><li class="x_x_MsoNormal"><span lang="EN-US" class="">Does BLING take the self-shading effect of phytoplankton themselves into account for light calculations?</span></li></ol><p class="x_x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;"> </p><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">I appreciate that these are potentially broad questions but any guidance would be much appreciated.</div><p class="x_x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;"> </p><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">Many thanks in advance,</div><p class="x_x_MsoNormal" style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;"> </p><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class="">Andrew Twelves</div><div style="margin-top: 0px; margin-bottom: 0px; font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 16px;" class=""><span style="font-size: 10pt;" class="">University of Edinburgh</span></div><br class=""><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p></div><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">MITgcm-support mailing list</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="mailto:MITgcm-support@mitgcm.org" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">MITgcm-support@mitgcm.org</a><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support</a></div></blockquote></div><br class=""></div></body></html>