or Error related to precipitation Regular calibration or field Preventive maintenance intensity corrected. verification. planned and applied. no regular maintenance Daily monitoring of the Regular monitoring of the collecting organized. collecting funnel funnel. Yearly calibration. Precipitation The larger of 5% or . The larger of 5% or . The larger of 10% or > 10% (rainfall) with (achievable measurement Reported resolution better than or 0.5 mm. or weighing rain uncertainty). equal to . Regular maintenance. no regular maintenance gauges Reported resolution better Regular calibration or point field than or equal to . verification organized. Yearly calibration. Global solar 2% for total 5% for daily total. 10% for daily total. Uncertainty > 10% for daily radiation (achievable measurement Pyranometer of good quality (acc. Pyranometer of moderate total or sensor not using a uncertainty). to CIMO Guide). quality (acc. to CIMO Guide) thermopile. Pyranometer of high quality Ventilation may be omitted. Ventilation may be omitted. Or (acc. to CIMO Guide). Regular calibration Regular calibration. Calibration not organized Ventilated sensor. Regular control of the sensor No regular cleaning of the Calibration two years. (including cleaning if necessary). sensor. Daily control of the sensor (including cleaning if necessary). Sensor heated (if the climatological conditions require it) Sunshine The larger of 0.1 h or 2% for The larger of 0.5 h or 5% for daily The larger of 1 h or 10% for Uncertainty > 1h or > 10% duration daily totals (achievable totals. daily totals. for daily totals or measurement uncertainty). 2% for yearly totals. 4% for yearly totals. Uncertainty > 4% for yearly To be checked 120 W.m-2 threshold Use of a sunshine recorder or Use of a sunshine recorder totals by experts applied to pyrheliometer’s calculation of direct radiation from or measurements. the direct measurement of global calculation of sunshine from Calibration every two years. and diffuse solar radiation. the measurement of global Regular calibration (if use of solar radiation of at least pyranometers) or regular control of class B. the sunshine recorder.
Error related to precipitation intensity corrected. Daily monitoring of the collecting funnel Yearly calibration. Regular calibration or field verification. Regular monitoring of the collecting funnel. Preventive maintenance planned and applied. or no regular maintenance organized. Precipitation (rainfall) with weighing rain gauges The larger of 5% or . (achievable measurement uncertainty). Reported resolution better than or equal to . Yearly calibration. The larger of 5% or . Reported resolution better than or equal to . Regular calibration or point field verification The larger of 10% or 0.5 mm. Regular maintenance. > 10% or no regular maintenance organized. Global solar radiation 2% for total (achievable measurement uncertainty). Pyranometer of high quality (acc. to CIMO Guide). Ventilated sensor. Calibration two years. Daily control of the sensor (including cleaning if necessary). Sensor heated (if the climatological conditions require it) 5% for daily total. Pyranometer of good quality (acc. to CIMO Guide). Ventilation may be omitted. Regular calibration Regular control of the sensor (including cleaning if necessary). 10% for daily total. Pyranometer of moderate quality (acc. to CIMO Guide) Ventilation may be omitted. Regular calibration. No regular cleaning of the sensor. Uncertainty > 10% for daily total or sensor not using a thermopile. Or Calibration not organized Sunshine duration To be checked by experts The larger of 0.1 h or 2% for daily totals (achievable measurement uncertainty). 120 W.m-2 threshold applied to pyrheliometer’s measurements. Calibration every two years. The larger of 0.5 h or 5% for daily totals. 2% for yearly totals. Use of a sunshine recorder or calculation of direct radiation from the direct measurement of global and diffuse solar radiation. Regular calibration (if use of pyranometers) or regular control of the sunshine recorder. The larger of 1 h or 10% for daily totals. 4% for yearly totals. Use of a sunshine recorder or calculation of sunshine from the measurement of global solar radiation of at least class B. Uncertainty > 1h or > 10% for daily totals or Uncertainty > 4% for yearly totals
CIMO_A1-A2-Doc_4.3%20Sustaind%20performance%20Surface%20Classification_as_published.docx