https://www.asianturfgrass.com/tag/daily-light-integral/Daily Light IntegralWowchemy (https://wowchemy.com)en-usThu, 16 Aug 2012 19:48:55 +0000https://www.asianturfgrass.com/media/sharing.pnghttps://www.asianturfgrass.com/tag/daily-light-integral/https://www.asianturfgrass.com/post/how-much-do-clouds-reduce-photosynthetic-irradiance/Thu, 16 Aug 2012 19:48:55 +0000https://www.asianturfgrass.com/post/how-much-do-clouds-reduce-photosynthetic-irradiance/<p> <figure > <div class="d-flex justify-content-center"> <div class="w-100" ><img alt="" srcset=" /post/how-much-do-clouds-reduce-photosynthetic-irradiance/featured_hua9f9c21e4813cc0be52337f2821447e9_252496_8973754d76f8d0463501d291885edac3.webp 760w, /post/how-much-do-clouds-reduce-photosynthetic-irradiance/featured_hua9f9c21e4813cc0be52337f2821447e9_252496_cd7090598e1c6328877c42245c2fa535.webp 1200w, /post/how-much-do-clouds-reduce-photosynthetic-irradiance/featured_hua9f9c21e4813cc0be52337f2821447e9_252496_1920x1920_fit_q80_h2_lanczos.webp 1920w" src="https://www.asianturfgrass.com/post/how-much-do-clouds-reduce-photosynthetic-irradiance/featured_hua9f9c21e4813cc0be52337f2821447e9_252496_8973754d76f8d0463501d291885edac3.webp" width="1200" height="873" loading="lazy" data-zoomable /></div> </div></figure> <br> Over the past year, I&rsquo;ve been doing a lot of research about climate and turfgrass performance, especially as it relates to how much light is available for photosynthesis. You may have seen <a href="http://bit.ly/INuLx6" target="_self" rel="noopener">the climate charts</a> that show the large differences in sunshine hours between cities in Asia and cities in North America and in southern Europe, even when the average temperature is quite similar. </p> <p> <figure > <div class="d-flex justify-content-center"> <div class="w-100" ><img alt="" srcset=" /post/how-much-do-clouds-reduce-photosynthetic-irradiance/img2_huc7f45fa3a3722adfe94ca9edc4e0ac03_180299_dde9546bbef4a3fe8ad0a65a2f59595a.webp 760w, /post/how-much-do-clouds-reduce-photosynthetic-irradiance/img2_huc7f45fa3a3722adfe94ca9edc4e0ac03_180299_eb89bc05e9c0891e61a2ff9b9bdc08f4.webp 1200w, /post/how-much-do-clouds-reduce-photosynthetic-irradiance/img2_huc7f45fa3a3722adfe94ca9edc4e0ac03_180299_1920x1920_fit_q80_h2_lanczos.webp 1920w" src="https://www.asianturfgrass.com/post/how-much-do-clouds-reduce-photosynthetic-irradiance/img2_huc7f45fa3a3722adfe94ca9edc4e0ac03_180299_dde9546bbef4a3fe8ad0a65a2f59595a.webp" width="1200" height="903" loading="lazy" data-zoomable /></div> </div></figure> More recently, I&rsquo;ve used <a href="http://bit.ly/OjhzC1" target="_blank" rel="noopener">a quantum meter</a> to measure the instantaneous photosynthetic irradiance in Thailand, Hong Kong, and Japan, from sunrise to sunset, and I&rsquo;ve written <a href="http://bit.ly/PfqcCe" target="_self" rel="noopener">a short report</a> that summarizes the results to date. <a href="http://bit.ly/PfqcCe" target="_self" rel="noopener">The report</a> shows the data from <a href="http://bit.ly/PfqcCe" target="_self" rel="noopener">hundreds of measurements</a> and explains that photosynthetic irradiance is reduced, generally, from 50% to 75% when it is cloudy. This has some bearing on the management and selection of grasses in tropical and subtropical areas with significant cloud cover that restricts the photosynthetic irradiance. <a href="http://bit.ly/PfqcCe" target="_self" rel="noopener">Download the five page report here (1 MB)</a>.</p> <figure > <div class="d-flex justify-content-center"> <div class="w-100" ><img alt="" srcset=" /post/how-much-do-clouds-reduce-photosynthetic-irradiance/img3_hua9a0345fdd97f942f966c6f1ff80ccd2_342123_428d8bcfb0c7ec1a9647575ff8f2c31f.webp 760w, /post/how-much-do-clouds-reduce-photosynthetic-irradiance/img3_hua9a0345fdd97f942f966c6f1ff80ccd2_342123_00f6b923941fcd981f4d9f004ba0880d.webp 1200w, /post/how-much-do-clouds-reduce-photosynthetic-irradiance/img3_hua9a0345fdd97f942f966c6f1ff80ccd2_342123_1920x1920_fit_q80_h2_lanczos.webp 1920w" src="https://www.asianturfgrass.com/post/how-much-do-clouds-reduce-photosynthetic-irradiance/img3_hua9a0345fdd97f942f966c6f1ff80ccd2_342123_428d8bcfb0c7ec1a9647575ff8f2c31f.webp" width="818" height="1200" loading="lazy" data-zoomable /></div> </div></figure>