Mapping monthly distribution of daily light integrals across the contiguous United States
Mapping monthly distribution of daily light integrals across the contiguous United States
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DOI：
10.21273/horttech.12.1.12
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发表时间：
2002-01-01
期刊：
影响因子：
1
通讯作者：
Faust, JE
中科院分区：
文献类型：
--
作者：
Korczynski, PC;Logan, J;Faust, JE
日光积分 (DLI) 是对 24 小时内发出的光合有效辐射总量的测量，是影响植物数周和数月生长的重要因素。等高线图的开发是为了展示美国本土一年中每个月的平均 DLI。这些地图基于国家可再生能源实验室编制和报告的 216 个地点 30 年的太阳辐射数据，采用辐射单位（瓦时每 m(-2).d(-1)，从 300 到 3,000 nm），我们将其转换为量子单位（mol.m(-2).d(-1)，400 到 700 nm）。 12 月美国北部的平均 DLI 范围为 5 至 10 mol.m(-2).d(-1)，5 月至 7 月美国西南部的平均 DLI 范围为 55 至 60 mol.m(-2).d(-1)。 10月至2月，DLI的差异主要出现在美国北部和南部之间，而5月至8月，DLI的差异主要出现在美国东部和西部之间。春分和秋分前后几个月DLI变化较快，例如，许多地方2月至4月增加了60%以上。等值线图提供了一种估算美国全年接收到的典型 DLI 的方法。
The daily light integral (DLI) is a measurement of the total amount of photosynthetically active radiation delivered over a 24-hour period and is an important factor influencing plant growth over weeks and months. Contour maps were developed to demonstrate the mean DLI for each month of the year across the contiguous United States. The maps are based on 30 years of solar radiation data for 216 sites compiled and reported by the National Renewable Energy Lab in radiometric units (watt-hours per m(-2).d(-1), from 300 to 3,000 nm) that we converted to quantum units (mol.m(-2).d(-1), 400 to 700 nm). The mean DLI ranges from 5 to 10 mol.m(-2).d(-1) across the northern U.S. in December to 55 to 60 mol.m(-2).d(-1) in the southwestern U.S. in May through July. From October through February, the differences in DLI primarily occur between the northern and southern U.S., while from May through August the differences in DLI primarily occur between the eastern and western U.S. The DLI changes rapidly during the months before and after the vernal and autumnal equinoxes, e.g., increasing by more than 60% from February to April in many locations. The contour maps provide a means of estimating the typical DLI received across the U.S. throughout the year.