Field Experiment in Tsukuba Test Site for ASTER Vicarious Calibration (Thermal Infrared Radiometer).

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  • ＡＳＴＥＲ代替校正のための筑波テストサイトにおけるフィールド実験（熱赤外放射計）
  • ASTER ダイタイ コウセイ ノ タメ ノ ツクバ テストサイト ニ オケル フィールド ジッケン ネツ セキガイ ホウシャケイ

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A preliminary field experiment for ASTER vicarious calibration (VC) was held in Tsukuba, Japan, on December 13 and 14 in 1997. Activities for ASTER/TIR (channels 10 to 14) in the experiment were water temperature measurements on Lake Kasumigaura at NOAA14 overpass times and four radiosonde observations per day. In the present paper, the effectivity of the VC of ASTER/TIR using the lake in winter is evaluated based on results from these activities.<BR>First, the top-of-atmosphere brightness temperatures (TOA-BTs) for AVHRR channels 4 and 5 are calculated from the VC with the in-situ measurements, and show very good agreements (<0.3K) with the TOA-BTs from the onboard calibration. Then, the TOA-BTs for ASTER/TIR channels are calculated with radiosonde profiles and NCEP GDAS (global data assimilation system) profiles around the lake during the experimental period, and show very good agreements (<0.3 K) with each other ; because the atmosphere around the lake was stable during the period; and because the GDAS profiles around the lake have high accuracy owing to a nearby permanent weather station. Finally, the sensitivity of input parameters to the VC of ASTER/TIR is analyzed under conditions around the lake in winter. The results show that the measurement errors of water vapor and air temperature profiles by a radiosonde are small enough for VC, the ozone profile and visibility (aerosols) errors degrades the VC of channel 12 and transparent channels respectively, and the accuracy of VC is most sensitive to water skin temperature.<BR>In the future, the VC of actual ASTER/TIR channels using the lake in winter will be executed based on the results from the present paper.

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