The daily dataset of coherent total column ozone were created from FY3/TOU from 2008 to 2017. Using total column ozone from FY3/TOU and tropospheric and stratospheric column ozone from AURA OMI/MLS satellite data, the seasonal variations of the climatological ozone in the region (40°E-160°E, 0-60ºN) are analyzed for the total, tropospheric and stratospheric column, respectively. Differences of ozone and circulation pattern between strong and weak East Asian summer monsoon year are also investigated. Variation of total, tropospheric and stratospheric column ozone is dominated by a low value center over the Tibetan Plateau and abnormal distribution in the monsoon region. There are significant differences of ozone concentration and circulation pattern during strong and weak monsoon in summer. The combination of the monsoon anomaly and the upper westerly jet anomaly affects obviously distribution of the tropospheric and stratospheric ozone during summer in the East Asia and the western Pacific regions.
FengYun-4A (FY-4A) is the first three-axis stabilized geostationary meteorological satellite in China, which was launched in the early morning of 11 Dec., 2016. Advanced Geosynchronous Radiation Imager (AGRI) is one of the four payloads onboard FY-4A, and acquired the first image on 20 Feb., 2017. FY-4A AGRI contains 14 spectral bands, in which 6 bands are in reflective solar region, with the nominal wavelengths at 0.47, 0.65, 0.825, 1.375, 1.61 and 2.25μm. The spatial resolution is 0.5 km for 0.65 μm band, 2 km for the shortwave infrared bands and 1 km for others. AGRI is designed with a solar diffuser, however it revealed the insufficient capacity for in-flight calibration mainly due to the partial aperture effect. The first vicarious calibration field campaign was conducted at the Dunhuang site of China Radiometric Calibration Site (CRCS) in Apr. 2017. It revealed the large bias of the AGRI data calibrated using the prelaunch calibration parameters, mostly underestimated. Using multiple land sites in Asia and Oceania, the calibration correction factors were derived combined with the CRCS data. The sensor's on-orbit radiometric response variation and observation bias against the simulated radiation were also monitored. It revealed that the bands at 0.65 μm was most stable, while 0.47 μm band showed the large degradation with an annual rate nearly 17%. In this paper, the calibration status of the FY-4A AGRI solar bands was presented.
The interannual variations of the Arctic total column ozone in spring from 1979 to 2011 are analyzed using measurements
of the Total Ozone Unit (TOU) onboard the second generation polar orbiting meteorological satellite of China, Fengyun-3
(FY3/TOU) and other satellites. It is found that the interannual variations are very distinct and are connected with the
stratospheric temperatures (with a correlation coefficient of 0.75). The daily and monthly variability of Arctic ozone are
extremely different in the anomalous year. The chemical impact is pronounced in the strongest ozone loss years (1997 and
2011), but not obvious in the weakest ozone loss years (1999 and 2010). The daily variations in the weak ozone loss years
could be regulated by the weather system process. The Arctic ozone variations are modulated by the atmospheric
circulation, accounting for change of AO, polar vortex and stratospheric temperature. When AO index is positive and the
polar vortex is stronger with colder stratosphere, the Arctic ozone loss is larger. When AO index is negative and polar
vortex is weaker with warmer stratosphere, the Arctic ozone loss is smaller.
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