Home > Guidance > Journal of the Aerological Observatory > Vol.70
| Title | Author | |
|---|---|---|
| Foreword | in Japanese | Masahito ISHIHARA |
| GRUAN ICM-4 Member visited to the Aerological Observatory on March 8, 2012 | in Japanese | Yoshiyuki NOTO |
| GRUAN ICM-4 site visit in Tateno, 2012 | in Japanese | Yoshiyuki NOTO and Yoshitomo KOJOH |
| The role of the Aerological Observatory,TATENO in GRUAN(GCOS Reference Upper Air Network) | in Japanese | Yoshiyuki NOTO, Hiroyuki YOSHII and Masami IWABUCHI |
| Investigation of characteristic of temperature at cloud top and stratosphere in the rainyweather with comparison observation data of RS2-91 Rawinsonde and RS92-SGP GPSsonde | in Japanese | Eriko KOBAYASHI, Hiroyuki YOSHII, Toyoo ABE and Yuya KANEKO |
| Development of quality management techniques and performance evaluation of Doppler lidar observation data | in Japanese | Masami IWABUCHI |
| The availability of using one second data for the cloud screening algorithmfor the direct solar irradiance | in Japanese | Noriaki OSHIKI and Tetsuya SHIMAMURA |
| The Temperature and Directional (Cosine) Responses of the Grating Spectroradiometer (MS-710) | in Japanese | Osamu IJIMA |
| Development of a Correction Program that Considers Results of Standard Lamp Test for O3 and SO2 Observation Values of Brewer Spectrophotometer(MKII) | in Japanese | Itaru UESATO |
| Total Ozone and UV Solar Radiation with Brewer Spectrophotometers at Norikura Station on the Japanese High Mountain in Recent Three Years | [Abstract] | Mahito ITO, Satoru SHIMIZU, Yoshiyuki NOTO, Tetsuya SHIMAMURA, Masato TAKITA, Hideaki SHIMODAIRA and Hideki ISHITSUKA |
| Global Spectral UV in Recent 6 Years and Test Observation of Diffuse Spectral UV with Brewer Spectrophotometer at Rikubetsu, Central Hokkaido | [Abstract] | Mahito ITO, Masaji ONO, Noritsugu TSUDA, Toshinobu MACHIDA, Nobuyuki YOKOZEKI and Yoshiyuki NOTO |
Japan Meteorological Agency (JMA) started "Observations of Total Ozone and UV Solar Radiation with Brewer Spectrophotometer at Norikura Mountains" as a joint project with Institute for Cosmic Ray Research (ICRR), University of Tokyo at the Norikura Observatory of ICRR (Brewer site: 36.11 N, 137.56 E, 2,772 m a.s.l.), locating at the Northern Japanese Alps, every summer seasons from 2009 (Ito et al.: 2011). Purpose of this study is based on the concept of developing Regional Brewer Calibration Centre for Asia and study of total ozone, total sulfur oxide and global/diffuse UV (GLUV/DFUV) included solar radiation (GLSL/DFSL) on the high mountains. Observation results by using Brewer spectrophotometers (BR#174, BR#113 and BR#060) and other instruments for the observation period of three summer seasons of recent three years between 2009 to 2011 are summarized as follows;
This joint project had been clarifying the low total O3 (approx. -3 to -6%), the high UV (CIE: approx. +35 to +52 %) and the significant low diffusivity of UV (CIE: approx. -15 to -20 %) in clear day, low turbidity and etc. at Norikura against the value at Tsukuba (36.06 N, 140.13 E, 39 m a.s.l.) at almost same latitude. By the absolute calibrations of Brewers for dsO3 and dsSO2 observations, O3 and SO2 Extra-Terrestrial Coefficients (=ETC) of BR#174 and BR#113 could be produced as about 10 samples satisfying the condition of "R2≥ 0.9997" every year. As an example of the calibration in 2011, the average of ETC of BR#174 was identical within 1% to the currently used coefficients. On the other hand, the GLUV increased in the short wavelength range at Norikura against the average at Tsukuba. The altitudinal increasing rate of GLUV (CIE) in the clear day indicated the calculated amounts of approx. +13 to +18 % per 1,000 m.
Those environmental conditions are useful for the intercomparison and the absolute calibrations with Brewers. The continuous observations with Brewers and other instrument are very important for the clarification of the seasonal variation and the coefficient trends.
The Aerological observatory has been implementing the checkup, adjustment, and calibration of Brewer spectrophotometer #057 (BR#057) of the National Institute for Environmental Studies Japan (NIES), at Rikubetsu station (43.45 N, 143.77 E) in Central Hokkaido, every year since 2005 as per the request of research cooperation from the afore mentioned institute. The calibration results of instrumental constants for UV observation, the observation results of global UV radiation in recent 6 years fromDec. 2005 to Dec. 2011 and the small test observation results of diffuse UV radiation at Rikubetsu are summarized as follows;
(1) BR#057 has been maintained in good condition in recent 6 years by the maintenances included optical adjustment, NIST lamp calibration and comparison to the travelling standard Brewer every year. (2) The secular variation of the monthly means of the daily total global UV (GLUV) at Rikubetsu in recent 6 years indicated the identical variation at Sapporo (43.06 N, 141.33 E), but differed from the one at Tsukuba (36.06 N, 140.13 E). Their irradiance ratios of the monthly means at Rikubetsu to Sapporo indicated the intensities from 0.8 to 1.4 and the average intensity was approx. 0.98. On the other hand, the irradiance ratios at Rikubetsu to Tsukuba indicated the intensities from 0.3 to 1.3, and the average intensity was approx.0.75 to 0.85, which is remarkable seasonal variation, recognized every year. (3) Diffuse UV (DFUV) was observed at Rikubetsu for 53 days during the winter season of Nov. 2009 to Jan. 2010. The average of daily diffusivity (RDFUV) at Rikubetsu indicated approx. 0.93 compared with approx.to 0.89 at Tsukuba during the period. This high value at Rikubetsu was presumed as due to the bad weather, including many of snowy days.
As stated above, BR#057 at Rikubetsu has been maintained and controlled in good condition by the annual checkup and adjustment. The continuous global UV observation and the full-year diffuse UV observation by the Brewer are very important for the detailed clarification of the annual change and seasonal variation of the UV at Rikubetsu.