Long-term variations of atmospheric transmittance from ... - GEWEX

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1970- JMA has been participating IPC to calibrate national(regional) standard pyrheliometers against international scale since IPC-III in 1970. IPC-III 1970 IPC-XI 2010
Used pyrheliometer & scale of solar radiation measuremnents Period Type of pyrheliometer Scale of solar radiation measurements Conversion factor to WRR 1932- Silver disk pyrheliometer 1957-1 970 Silver disk pyrheliometer Smithsonian scale (JMA) (Ångström scale 1905 x1.035) 1.026 / 1.035 =0.9913 IPS-1956 (JMA) 1.026 / (1.035x0.98) (Ångström scale 1905 x1.035x0.98) =1.012 1971-1 977 1978-1 980 Silver disk pyrheliometer Thermoelectric pyrheliometer 1981- Thermoelectric pyrheliometer IPS-1956 IPS-1956 WRR 1.022 1.022 1.000 All of the measurements were converted in WRR, before calculating the transmittance. As for the solar constant, a fixed value of 1367 W/m 2 recommended by World Meteorological Organization (WMO) was used.
Page 1 and 2: Long-term variations of atmospheric
Page 3 and 4: Direct solar radiation measurements
Page 5 and 6: Data rescue Recently, the results o
Page 7: transfer the pyrheliometric scale
Page 11 and 12: • Diurnal variations between 09,
Page 13 and 14: Results • From 1933 to late 1940s
Page 15 and 16: Bias correction for rawinsonde meas
Page 17 and 18: Calculation of transmittance due to
Page 19 and 20: Results (cont.) • Main cause of t
Page 21: Danke!!

Long-term variations of atmospheric transmittance from ... - GEWEX

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