Temperature dependence of brightness temperature difference of AVHRR infrared split window channels in the Antarctic
スポンサーリンク
概要
- 論文の詳細を見る
One method to identify clouds from NOAA/AVHRR data is to use the difference in brightness temperature of infrared split window channels in the 10μm region. Under the low temperature over the Antarctic continent in winter, it is necessary to detect a slight difference in brightness temperature. In this paper, we investigate the temperature dependence of the brightness temperature difference of channel 4 (10.8μm) brightness temperature (T4), and channel 5 (12 μm) brightness temperature (T5) (T4-T5) of a cloud free scene. T4-T5 is about 0°C at low temperature around -80°C, and gradually increases up to a high of 1°C at high temperature around 0°C. The rates of increase in T4-T5 were almost constant for T4 lower than -40°C. For T4 higher than -30°C, T4-T5 remains almost unchanged. For T4 between -40°C and -30°C, T4-T5 increases rapidly. In order to explain this temperature dependence, the contribution of water vapor and surface emissivity to the difference in brightness temperature was calculated from in situ data using the radiation code MODTRAN. The result is shown below. About the contribution of water vapor, at T4 lower than -25°C, T4-T5 was nearly zero. From about -25°C to 0°C of T4, T4-T5 increases up to near 0.6°C. On the other hand, when the surface emissivity difference between CH4 and CH5 was set to 0.01, T4-T5 increased in all temperature ranges. The rate of increase was almost constant. In the temperature range lower than -40°C, T4-T5 conformed to T4-T5 of satellite data.
- 国立極地研究所の論文
著者
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Hirasawa Naohiko
National Institute of Polar Research
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Yamanouchi Takashi
Geosystems Inc.
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Yamanouchi Takashi
National Institute For Polar Research
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Hirasawa Naohiko
National Inst. Of Polar Res. 9-10 Kaga 1 Itabashi Tokyo 173-8515 Jpn
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Yamanouchi T
Graduate Univ. Advanced Studies Tokyo
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Kadosaki Gaku
Department of Polar Science, School of Mathematical and Physical Science, The Graduate University fo
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Kadosaki Gaku
Department Of Polar Science School Of Mathematical And Physical Science The Graduate University For
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Yamanouchi Takashi
National Inst. Of Polar Res. And Dep. Of Polar Sci. The Graduate Univ. For Advanced Studies 10-3 Mid
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