Inter-Comparison between COMS/MI and Himawari-8/AHI

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Presentation transcript:

Inter-Comparison between COMS/MI and Himawari-8/AHI Hyeji Yang NMSC/KMA

GEO-GEO Inter-comparison Methods Compatible Channels COMS/MI Himawari-8/AHI VIS(0.67㎛) VIS(0.64㎛) IR1(10.79㎛) Ch13(10.41㎛) IR2(12.06㎛) Ch15(12.38㎛) WV(6.74㎛) Ch08(6.24㎛) SWIR(3.75㎛) Ch07(3.89㎛)

MI vs. AHI Observation Area Common observation area of MI and AHI Region is colored with TB bias[K] (MI-AHI) passed Uniformity test (21 July 2017 02UTC) SWIR WV IR1 IR2

Inter-comparison of MI and AHI IR channels Relationship between MI and AHI Tb of IR channels Period: 1~31 Aug. 2015 SWIR(3.75㎛) WV(6.74㎛) Number 17,101,872 84,244,064 Bias -0.030 -0.394 RMSE 0.446 1.369 Slope 1.03 0.92 Intercept -9.36 18.62 IR1(10.79㎛) IR2(12.06㎛) Number 40,780,312 44,053,614 Bias 0.408 -0.433 RMSE 0.472 0.638 Slope 0.99 1.02 Intercept 3.13 -5.54

Seasonal variation of MI and AHI IR channels Seasonal variation of Tb[K] bias (at MI standard temperature) during 2016 (1 year) Shown by Midnight, Morning, Afternoon

Diurnal variation of MI and AHI IR channels Diurnal variation of Tb[K] bias (at MI standard temperature) during 2016 (1 year)

Diurnal variation of MI and AHI IR channels Diurnal variation of Tb[K] bias (at MI standard temperature) during 2016 (1 year) Each line means season (spring, summer, autumn, winter)

Diurnal variation on clear spot Diurnal variation of MI and AHI IR1(10.8㎛) on clear pixels (3x3, 7x7 avg.) Case: Jan. 2018 00~23UTC, 35.4ºN, 130.1ºE Hour(KST) MI AHI Bias 09 285.891 284.796 1.096 10 284.815 1.076 11 285.924 284.861 1.063 12 285.908 284.897 1.011 13 286.056 284.987 1.069 14 286.089 285.047 1.041 15 286.187 285.098 1.089 16 286.105 285.041 1.064 17 284.998 1.107 18 285.99 284.904 1.086 19 284.918 1.006 20 284.899 0.992 21 285.776 284.876 0.900 22 285.595 284.808 0.786 23 285.38 284.720 0.660 00 285.28 284.711 0.569 01 285.115 284.670 0.444 02 285.048 284.741 0.307 03 284.798 0.482 04 285.528 284.878 0.650 05 285.644 284.864 0.780 06 285.694 284.761 0.933 07 285.727 284.723 1.004 08 284.641 1.135 * COMS IR1 Tb[K](‘18.1.1.02:00UTC) Himawari-9 CA (‘18.1.1.19:40UTC)

Inter-comparison between MI and AHI VIS channel Difference of MI(0.67㎛) and AHI VIS(0.64㎛) reflectivity SBAF calculated from the Ocean/DCC Earth spectra is applied to each ocean/DCC pixels * Reference: http://cloudsgate2.larc.nasa.gov/SBAF (NASA Langley web-based spectral band difference correction calculator) Ocean DCC

Thank you