Fukuda M

Kobayashi Y

Kondoh J

English

Fukuda, M.

Kudoh, J.

Kobayashi, Y.

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Forest Fire Occurrence Detected by NOAA Near Yakutsk, Eastern Siberia (Extended Abstract)

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Forest Fire Occurrence Detected by NOAA NearYakutsk, Eastern Siberia (Extended Abstract)著者 Fukuda M, Kondoh J, Kobayashi Y雑誌名 The science reports of the Tohoku University.Fifth series, Tohoku geophysical journal巻 36号 4ページ 460-461発行年 2003-05URL http://hdl.handle.net/10097/45425 TOhoku Geophys. Journ. (Sci.Rep.  TOhoku Univ., Ser. 5), Vol. 36, No.  4, pp. 460-461, 2003Forest Fire Occurrence Detected by NOAA Near Eastern Sibreia (Extended Abstract)Yakutsk,M. FUKUDA1, J. KUDOH2 and K.  KOBAYASHI'    'Institute of Low  Ternp.Sci. Hokkaido Univ.  'Center for Northeastern Asian Studies,Tohoku Univ.  'Japan Science and Technology Corp.          (Received January 5, 2003)   Recently numbers of forest and wild fires tend to increase in eastern Siberia. It is one of extraordinary summer season in 2002 as lots of fire occurred. Present authors developed new algorism for detection of forest fire and tendency of fire occurrence was correlated to local weather condition. As to detect fire occurrence on the ground, NOAA AVHRR image data were used in this study. The fire detection algorithm consists of two  stages  : The first selects candidate pixels which could potentially be fires and the second confirms by human eyes.    A pixel is selected as a potential fire  if  :       Tch3 > 316 K (1)    and        Tch3 - Tch4 > 10 K (2)    and       Tch4 > 250 K (3)    Where, Tch 3 and Tch 4 are AVHRR brightness temperatures in channel 3 and 4 respectively. The choice of thresholds used in these tests was driven by our experience.    Confirms by human eyes.    The second stage confirms that the potential fire selected in the first stage is definitely a fire. For each potential fire, this decision made in light of some knowledge of the potential fire pixel and its neighbours. Indeed, if a long beam smoke appears with potential fire, this potential fire is selected as fire.    The one of detected results is shown in  Fig. 1. Daily occurrences of fire were plotted in Fig. 2. Accumulated area of total burned was obtained as 14,300  km2 over one million  km2, which is larger by twice than in last year. The causes of high fire occurrence in this summer are summarized as  follows  ;    Low summer precipitations    Low snow accumulation in winter    Low water contents in soil    Prevailing southern wind in summer.461 t • f. - • • • -0Foo'  •Fig. L         • -.  . -                 7 ':      0- - 2Okm   18  A1::  2602  NOAA- 12)Detected Forest Fire on 18th July 2002 402350O250 .14  200rn150 1C050 ^  2001 102002 5152km2  14300km2403318299270 3641 5',  5  5       •;-.2       5, 5,',77 CateFig. 2. Detected Fire p oints in summer season 2002

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Forest Fire Occurrence Detected by NOAA Near Yakutsk, Eastern Siberia (Extended Abstract)

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