first look at the so2 index calculated from omi observations · so2 index for this study, we show...
TRANSCRIPT
-
010
2030
4050
60C
ross
Trac
kPo
sitio
n
-3
-2
-10123
N-eul avt ne mt s uj A
l=31
4.4
nml=
313.
2nm
l=31
1.9
nml=
310.
8nm
Vol
cani
c SO
2 D
etec
tion
•O
MI v
s. A
IRS:
Man
am(P
apua
New
Gui
nea)
-O
ct 2
4, 2
004
•O
MI v
s. EP
-TO
M: A
mbr
ymvo
lcan
o, V
anua
tu –
Oct
24,
200
4
SO2
Inde
x
For t
his s
tudy
, we
show
map
s of S
O2
inde
x, d
efin
ed a
s the
resi
dual
diff
eren
ces b
etw
een
sele
cted
pa
irs o
f wav
elen
gths
, whi
ch h
ave
larg
e di
ffer
entia
l sen
sitiv
ity to
the
SO2
abso
rptio
n.Firs
t Loo
k at
the
SO
2 in
dex
Cal
cula
ted
from
OM
I Obs
erva
tions
Fi
rst L
ook
at th
e S
O2
inde
x C
alcu
late
d fr
om O
MI O
bser
vatio
ns
K. Y
ang1
* , N
.A. K
rotk
ov2 ,
S. C
arn2
, A. K
rueg
er2 ,
and
P.K
. Bha
rtia3
1. S
cien
ce S
yste
ms
and
Appl
icat
ions
, Inc
., La
nham
, MD
US
A2.
JE
CT/
GES
T, U
nive
rsity
of M
aryl
and,
Bal
timor
e C
ount
y, B
altim
ore,
MD
, USA
3. N
ASA
God
dard
Spa
ce F
light
Cen
ter,
Gre
enbe
lt, M
D, U
SA
* Ka
i_Ya
ng.1
@gs
fc.n
asa.
gov
A33
A-0
137
-2
2
150
400
010
0
Tot
al C
olum
n O
zone
Ref
lect
ivity
@ 3
31 n
m
Pair
2 S
O2
inde
x
Thre
e pa
irs o
f wav
elen
gths
are
sele
cted
for O
MI
SO2
inde
x ca
lcul
atio
n, a
s illu
stra
ted
in th
e fig
ure
show
n on
the
right
. Thi
s plo
t sho
ws t
he N
-val
ue
resi
dual
s fo
r 1.0
DU
of S
O2
is p
rese
nt a
t 15
km o
f al
titud
e. N
ote
that
the
resi
dual
diff
eren
ces,
i.e.,
the
SO2
indi
ces s
how
a d
istin
ct p
atte
rn: p
air 1
and
pai
r 3
indi
ces a
re e
xpec
ted
to b
e ne
gativ
e, w
hile
pai
r 2 in
dex
is e
xpec
ted
to b
e po
sitiv
e, w
hen
SO2
is p
rese
nt in
the
atm
osph
ere.
Man
y ot
her f
acto
rs m
ay c
ontri
bute
the
resi
dual
s, bu
t whe
n th
e th
ree
pairs
show
the
dist
inct
pa
ttern
illu
stra
ted
here
, one
can
be
reas
onab
ly
conf
iden
t tha
t SO
2 is
det
ecte
d.30
030
531
031
532
032
533
0wl
Hnm
L
0
0.2
0.4
0.6
0.81
1.2
N-eul av
p1 -p2 +
p3 -w
l=(3
10.8
, 311
.9, 3
13.2
, 314
.4) n
mp1
p2
p3
Res
idua
ls: 1
.0 D
U S
O2
@ 1
5 km
INT
RO
DU
CT
ION
The
Ozo
ne M
onito
ring
Inst
rum
ent (
OM
I) on
boar
d th
e A
ura
spac
ecra
ft m
akes
hyp
er-s
pect
ral
radi
ance
mea
sure
men
ts in
the
Ultr
a-V
iole
t (U
V) a
nd V
isib
le (V
IS) r
ange
. The
OM
I mea
sure
men
ts
cove
rs th
e gl
obe
daily
and
has
a n
adir
reso
lutio
n of
13x
24 k
m2 .
Thes
e ch
arac
teris
tic o
f OM
I off
er a
n im
prov
ed c
apab
ilitie
s for
mon
itorin
g oz
one
and
othe
r tra
ce g
ases
, suc
h as
SO
2, in
the
atm
osph
ere.
We
have
app
lied
the
TOM
S to
tal o
zone
alg
orith
m to
the
OM
I UV
2 sp
ectra
l rad
ianc
e m
easu
rem
ents
, w
ith sp
ectra
l ran
ge fr
om 3
06 to
370
nm
at a
sam
plin
g di
stanc
e of
0.15
nm
/pix
el a
nd a
reso
lutio
n of
0.4
5 nm
. We
exam
ine
the
resi
dual
s tha
t are
cal
cula
ted
as th
e di
ffer
ence
bet
wee
n th
e m
easu
red
and
the
com
pute
d th
eore
tical
radi
ance
s tha
t acc
ount
for t
he e
ffec
ts o
f ozo
ne, R
ing,
and
surf
ace
refle
ctiv
ity.
Ana
lysi
s of t
hese
resi
dual
s is v
ery
usef
ul in
det
ectin
g in
stru
men
t arti
fact
s and
cal
ibra
tion
erro
rs a
s wel
l as
unu
sual
atm
osph
eric
con
ditio
ns. S
ulfu
r dio
xide
(SO
2) h
as a
stro
ng a
bsor
ptio
n in
the
wav
elen
gth
rang
e 30
6-34
0 nm
. Res
idua
ls in
this
wav
elen
gth
rang
e sh
ow d
istin
ctiv
e fe
atur
es if
a si
gnifi
cant
am
ount
of
SO
2 is
pre
sent
in th
e at
mos
pher
e, su
ch a
s in
the
case
of v
olca
nic
clou
ds o
r air
pollu
tion.
How
ever
, SO
2 is
abs
ent o
ver m
ost o
f the
Ear
th a
nd re
sidu
als a
re se
nsiti
vedi
agno
stics
of i
nstru
men
t per
form
ance
.
OM
I Dai
ly G
loba
l Map
s •T
OM
S-V
8 al
gorit
hm, w
hich
use
s a sm
all s
et o
f dis
cret
e w
avel
engt
hs, i
sapp
lied
to th
e O
MI d
ata
to
deriv
e to
tal c
olum
n oz
one
and
othe
r rel
ated
par
amet
ers.
Thes
e se
t of m
aps s
how
s the
tota
l col
umn
amou
nt o
zone
, sur
face
refle
ctiv
ity a
t 331
nm
, and
the
pair
2 SO
2in
dex.
The
se a
re th
e re
sults
afte
r N-
valu
e ad
just
men
ts w
hich
rem
oves
the
cros
s-tra
ck b
ias.
Man
am
Aqu
a/A
IRS
SO
2co
lum
n04
00U
T(c
ourte
sy A
.J. P
rata
, CS
IRO
, Aus
tralia
)
Aur
a/O
MI S
O2
colu
mn
0412
UT
Sum
mar
y•A
naly
sis o
f the
ear
ly re
sults
from
OM
I ind
icat
es th
at th
is in
stru
men
t is p
erfo
rmin
g ve
ry w
ell.
•OM
I L1B
nee
ds t
o be
cor
rect
ed fo
r cro
ss-tr
ack
bias
. N-v
alue
adj
ustm
ent w
orks
wel
l for
this
co
rrec
tion.
•SO
2 de
rived
from
OM
I mea
sure
men
t sho
ws g
ood
agre
emen
t with
that
from
AIR
S.
•OM
I vs.
EP-
TOM
S co
mpa
rison
dem
onst
rate
s the
hig
her s
ensit
ivity
of O
MI m
easu
rem
ents
with
less
ba
ckgr
ound
noi
se th
an th
ose
of E
P TO
MS.
N-v
alue
Adj
ustm
ent f
or S
O2
inde
x
Sout
h A
tlant
icA
nom
aly
•N-v
alue
= -1
00 L
og10
(Rad
/Irra
d)
•Cro
ss-T
rack
bia
s is p
rese
nt in
OM
I L1
B d
ata
due
to c
alib
ratio
n im
perf
ectio
n.
•N
-val
ue a
djus
tmen
ts c
an b
e de
rived
to
cor
rect
sca
n bi
as. F
or a
det
ail
desc
riptio
n of
this
tech
niqu
es, p
leas
e se
e po
ster
#
A33
A-0
133.
•Fo
r SO
2 in
dex
calc
ulat
ion,
N-v
alue
ad
just
men
ts sh
own
here
are
the
aver
age
of th
e re
sidu
al a
t the
re
spec
tive
wav
elen
gth
in th
e eq
uato
rial r
egio
n.
Oct
ober
24,
200
4
Ack
now
ledg
men
tTh
is w
ork
is su
ppor
ted
unde
r NA
SA c
ontra
ct N
AS5
-002
20.
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