Annual sum values represent an accumulation over time. By integrating the irradiances over the number of seconds in a day, the daily sum of radiant energy in units of Joules per square meter is obtained. Then adding together the daily values for the entire year yields amount of radiant energy received during the year. The Flint biological spectral weighting function is a generalized action spectrum relating to plant damage from UV radiation exposure encompassing wavelengths from 280 to 380 nm and has been widely used to predict the consequences of ozone depletion.

UV Index for Oct 24, 2014 Local Time
Graph of UV Index for yesterday

Latest News
October 2014

Welcome Dr. Shinichi Asao, our new Postdoctoral Research Fellow. Dr. Asao received his PhD from the Graduate Degree Program in Ecology at Colorado State University. His research will focus on simulating the impact of UV radiation and other climate stress factors on ecosystem dynamics. He joins our staff with extensive experience in testing, validating, and evaluating ecosystem models for forests, grasslands, and deserts of the U.S. Welcome.

Drs. Wei Gao, and Zhibin Sun attended the SPIE Remote Sensing and Modeling of Ecosystems for Sustainability conference in San Diego, California, August 17-21. Dr. Gao chaired the conference and presented scientific progress of climate/crop/ecosystem modeling effort . Dr. Sun presented Assimilation of remote sensing data into crop growth model to improve the estimation of regional winter crop yield.

read more ...

Picture of our instruments at various locations
2006 Annual Flint Across the United States


The UV-B Monitoring and Research Program (UVMRP) is a data collection and research program of the United States Department of Agriculture (USDA), headquartered at Colorado State University in Fort Collins, Colorado.

The UVMRP supports two unique and complimentary program components:

Integrated Agricultural Impact Assessment System

Agriculture is entering a critical period with regard to climate change, crop stress and potential related impact to crop productivity. Decision makers need reliable and relevant crop yield and economic assessment tools. The objective of this UVMRP program component is to develop an Integrated Agricultural Impact Assessment System. This system will couple the Earth's climate, ultraviolet-visible solar radiation and comprehensive crop growth models, as well as assimilating satellite and in situ observations to study climate-crop interactions and related economic impacts stemming from crop response to a wide range of stressors, including temperature, moisture, nutrient, UV radiation, CO2 concentration, aerosols and other air pollutants. Please click on the above Agricultural Impact for more information.

UV-B Monitoring Network

High energy ultraviolet solar radiation can significantly damage plants, crops, animals, and ecosystems, alone or in combination with other environmental stress factors such as temperature and moisture. To address these concerns, in 1992 the USDA established the UV-B Monitoring and Research Program at Colorado State University to provide cost-effective monitoring of UV-B levels over wide geographic areas of the United States. The program's primary objective is continued operation of the national network of UV-B monitoring instruments to deliver high quality data, data products, and services in support of agricultural research describing the geographic distribution of UV-B solar irradiance, effects of increased or diminished UV-B on crops, native and invasive plants, and animals, and to facilitate the use of these measurements directly or as input to climate and crop models.

The data is collected automatically every night, processed for quality control, and made available on this web site, typically within one day of its collection. Most data is available back through 1997, with some additional data available back to 1993. Please click on the above Monitoring Network for information about our locations and instruments. Please click on the above Data Download for our data and data products.