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 ,**/  .  ,,  ,**/  ++  +. ῌRemote FT-IR Measurements of Volcanic Gas Chemistry in the Plume of Asama Volcano
Toshiya MORI῍ and Kenji NOTSU῍Remote FT-IR measurements for volcanic gas chemistry were carried out twice before and four times afterthe ,**. Asama eruptions. In these measurements, solar infrared light scattered by higher clouds or plumes wasused as a light source for the FT-IR absorption measurements. We have successfully detected - volcanic gas
components, SO,, HCl and HF, in the observed spectra. The HCl/SO, ratios observed after the onset of the ,**.
Asama eruptions were between *.+1 and *.,*, which are probably reﬂecting the ratios not inﬂuenced by anyhydrothermal interactions. In contrast, the HCl/SO, ratios before the eruptions were slightly lower than thoseafter the eruptions. The slight increase in the ratio from pre-eruptive to post-eruptive periods suggests that thehydrothermal or groundwater impact to the volcanic gas emitting system was small even three years before theeruptions. The observed HF/HCl ratios before the eruptions and in March ,**/ were about *.+, whereas theratios were higher, over *.+3, during the high activity period from mid-September to October ,**.. During thecontinuous ash emitting eruptions on September +0, ,**., exceptionally low HF/HCl ratio of *.*- was observed.
The HF column amount on this day was probably under detection limit, possibly due to HF depletion caused byadsorption on dense ash in the plume.
Key words : FT-IR, volcanic gas, remote measurement, Asama volcano+ῌ ῐ ῎ ῑ ῏Notsu, +331), HF (Love et al., +332 ; Francis et al., +332),

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HCl  , ijklmn'(&JoD0p/

''(!&F0J Oppenheimer et al. (+332) &I (Mori et al., +33-) qr#& stM FT-

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FT-IR EFI g'(MJ '(-,"z&{RIS SO, , HCl PQM{t SiF. (Francis et{* ZZ &"*89:ij

al., +330), CO |'()*S ID&J'MN* FT-IR dG

} +331 CO,, COS (Mori and «++-ῌ**-- ¬­®¯­°±² 1ῌ-ῌ+¬­§w§w³ῌw´µ¶·¸vw¹º»¼
Laboratory for Earthquake Chemistry, Graduate
School of Science, The University of Tokyo, 1ῌ-ῌ+Hongo, Bunkyo-ku, Tokyo ++-ῌ**--, Japan.
Corresponding author : Toshiya Morie-mail : mori@eqchem.s.u-tokyo.ac.jp0 -?!&89:cB&{*S '&uEMO*89:c,/0J Z_`a(Mori et al., +33/) Ze?[\]2^ab (Mori etal., +33-) 89:c (Francis et al., +33/) :(Francis et al., +332 ; Love et al., +332) BGH*S u

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

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L* SO, 6BIJ  >9:M; ,**.?
,**.  3 + + - ,**. %N7

Fig. +. FT-IR system used in volcanic gas measurements at Asama volcano. The photo shows
the system at the parking area on Onioshi
Highway (B in Fig. ,) on October +, ,**..
The slope on the right side of the photocorresponds to the ﬂank of Asama volcano.
Mt. Koasama is to the left of the slope.

-%OPQ<RSTU  =4/Uf qJ

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5Zi \j  klm %On i$  5Z \  IJ,ῌ ῎ῐ῏ῑ῍῎ῐῒΐ&'] HY=VWI  AR`BC a%bcDde

X 6fg (FT-IR) (Fig. +) h    6fgBOMEM i MB-+** >Fig. + EFBG?
-* cm

Hj

kIl / mrad mno1peAR` >Fig. + q

JrKF? Ls BGtMN  _Bu

 InSb _Bu+,2** <v+

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3/<\ !\h 

 _Bu InSb _BuhSO,  HCl ¡¢ ,,*** cmv+ (kOow 8]5Z ^  =VW
 IXp i$£8 5Z ¤ I¥@ I Ls&'`\  SO,, HCl, HF 3¡¢¦ ; =Q AR` zp{|%} ~ #Rqr;s3¡¢¦  I+/* kg 8 H ISFTk 

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 !\ 

Ls !\ HY
 (Francis et al., +332) \5Z&' \%O©v ª«'&'wbh ¬­A[x3/a®¯®po\ (Love et al., +332) [\/ >  °¡¢±§$%} HITRAN

AR`«%}2% (Rothman et al., +332 ; ,**-) h  ª 7\8  8  >«'&'²B LBLRTM (Line-by-Line Ra-

&']? ^\  >X 

diation Transfer Model) (e.g., Clough et al., +33, ; CloughHYLs !\h BGkI tu?  Ih  H AR`_$|<.] 
8 ? IBGM%OM

and Iacono, +33/) \ 6fy-ª«'\Ls&'²B³´o§¨h   µFCT

HbZ878 8  38 - G;

 >SO, HCl \ HF? xz ()¶c X + d ,-\e fO{· ¥@  SO, `a878,,.,*¸,,/3* cmv+ {·

234A 64RS  N,O  H,O  

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»¼5

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

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 CH.

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

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 HCl, SO,, HF  /01 -ῌ ῔ῑΐ῍῎ῐ῕234 FT-IR 5  ,**.
++ 8 +0  ,**+,**.

67 ,***

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Fig. , [. .  NA > DP  \4

 !5 ] 4"#^$/0)

Fig. ,. Map of Asama volcano showing locations of
the FT-IR measurements (circled letters). A :parking area of Asama Volcano Museum, B :parking area on Onioshi Highway, C : Asama
Volcano Observatory, D : Manzanbo lookout.
Contour lines have +**m spacing.

 %&7'_()`*+a " ()AbcU,  d']  5e -f0Agh`* ()i.

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3404:;  %&7()4"ba(n+­n-) HCl NP ®P  HF NR ®P ¯°] ,,.,*<. A0 >0&f5l ),,/3* cm+ ,,2**,,23* cm+  .,*,*.,*0* cm+ 

5 > ()A=;a G>()

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S¡¢v£*])=>S¡¢v£ SO, HCl

 HF ¯°L±  [. ²³ ´± SO, (Fig. .a+) HCl (Fig. .b+)  HF (Fig. .c+)  )23645 m> 4"@bA4

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m?3pl NFig. , : C P 5 InSb ¦)' ()AB: <.5 .)  SO, ¯°+ ,,/.*,,/3* cm¯°+0 ,**.

3 8 +0  C4D NFig. , : D 

N,O «¬. ·& Fig. .b,  .c, Na¯°P q5 )s:AC4¸Y¢ )¹º+  H,O

D]Ar&f5 64 E.KL«¬ 5S¡¢v£> HCl, HF ¯¥ ¦§¨©ª«¬570

Fig. -. Example of an observed spectrum collected
on Mach +*, ,**/. Three bars above the spectrum show the wavenumber ranges used forspectral analyses for SO,, HCl and HF, respectively.

  

 HCl  HF

01 2345 6

./

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%$&' Fig. .

' 0 7 89 :; SO, HCl  HF

9%



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- }@

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 Table + 6'HClῌSO,  HFῌHCl 0\  ,**+ N - O 89

**  +/ : /* G +- 

 

-

+/ :

899%G HCl ῌ SO, \A HFῌHCl \  '  Fig. .. Example spectra in the wavenumber rangesfor (a) SO,, (b) HCl and (c) HF spectral
analyses. Wavenumber ranges in a,, b, and c,correspond to those of the three bars shown in
Fig. -, and dotted and solid thin lines areobserved spectrum and the model spectrum
obtained by non-linear least-squares regression
method, respectively. Spectra shown in a+, b+
and c+ are transmittance of SO,, HCl and HF,
respectively.

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Table +  

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571

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--W 12h0i#j k %$lSO,# --W"Z>[= FT-IR C-&'mn 123Ccopqrstouvw4x N yz{#  123cop#qr-"  &'n$#|}L~s=? 123&'mn#k6
 D FT-IR 

9[C'B"

4H-C FῌCl H C\-# ClῌS
H FT-IR #^NO4- (Aiuppa et al., ,**.)
-l !" ClῌS H Cl ""HCk HCl/(SO,H,S) HK
 \ FT-IR C H,S (CN NC Clῌ
S H HClῌSO, HK  !

B

 Cl ῌ S HN HCl/(SO, H,S) H" HCl ῌ
SO, HN

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[=N

(Aiuppa

et al., ,**.) ,- Burton et al. (,**+)  HCl #qr

-cop|}L-!"
Fig. /. Gas column amounts plots for March +*,,**/ observation. (a) HCl vs. SO,, (b) HF vs.
HCl. The best-ﬁt regression lines are shown,and their gradients correspond to the gas concentration ratios in Table +.

Table +.

123HClῌSO, H 4¡¢N  £[ HCl " SO,c¤¥NC!¦§4¨ N  ©
Z>ª«" HFῌHCl Hk¬ "Z>[= # !=­ B®"!¯ N \ °±²³´µ¶·C FT-IR C 1(Results of the 0 FT-IR measurements carried out before and after the ,**. eruptions.

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572

 +, 

   (Burton et al.,:; ! ebe GMN A@ HClῌSO, !9 *.+1 *.,* 7=8T!

,**.)     

:;  7 P'dK (,**.) A@QR?

 !  "# $ 

%!

 ClῌS ! *.+R*., 'S%SkT&' ()*+ ,-./0 ! W  A& HClῌSO, !=!! A&

 12 34567 8&'9

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=B,- 8ebe N w/ῌ ῏ῐ!79A& z % ,-HClῌSO, ῑ῍ῒ῎/ῌ+

8 ,*** $,**+ $W E ebe N

Noguchi and Kamiya (+30-)  ,/ῌ KOH $=?@AB %!X >?*O ?p.   EF&'GET z! GHIJKLM JKL! A@  A&  ebe'Y9O ?@qr/= >=?@ABCD

SῌCl !="  # 67 +3/1 $SῌCl !

WhEXZH[   >?p*O ?p

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 +3/2 $ 3 V

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-8. ! (Hirabayashi et al., +32, ;+320) ]^ _`abcdefgA@ FT-IR =HFῌHCl ῑ῍ῒ῎Table + =!!

 A& HFῌHCl !

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'(!9 ,**/ $ - V + 2

3i456A=j!9 SO,ῌHCl !

,**+ $ - V

 HF ῌ HCl !

&7*.+3 +* V + 2  *.,/ A& , `W

 *.+* A)T! 3 V +0 25 HFῌHCl !

+332 $ +333 $ ,*** $  5    +.0 R +.2  k 

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HT 79 ,**+ $A8l & !9 ..1 W

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! (Du#ell et al., ,**-) efgA@A&wP

SO,ῌ

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 HCl HE- SO, 8kCBu0!:;

!

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D ,*R1/ ppmm %S

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9 h ©

ª ! ebe N
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