nitrate and conductivity record...1851 1849 helka 1597 cosiquina 1835 babuyan claro 1831. 1991....
TRANSCRIPT
1984
1807
mt.
st.
Hel
ens
1801 1794
1789
laki
178
3
1774 17
72
1763
tar
um
ai 1
739
1730 kr
aFla
172
8 o
rae
Fajo
kῡll
172
7
myv
aten
Fir
e 17
24
1721
kat
la 1
721
1719
Hel
ka 1
693
katl
a 19
18ta
mbo
ra
1815
1813
katm
ai 1
912
1909
tun
gu
ska
even
t 19
08
tar
um
ai 1
667
katl
a 16
6018
98
1896
1888
*
1885
WH
ite
riv
er a
sH 1
885
krak
a tau
188
3
1877
1876
Fur
nas
163
0
katl
a 16
25
1864
WH
ite
lig
Ht
Flar
e 18
59
sHev
elu
cH
185
4
cH
iku
rac
Hki
-tat
arin
ov
1853 18
51
1849
Hel
ka 1
597
co
siq
uin
a 18
35
babu
yan
cla
ro
183
1
1991
1990
1989
st. a
ug
ust
ine
1986
saku
ra-
jim
a 19
77?
1974
1972
Hek
la 1
970
sHev
elu
cH
196
9
1963
1962
n
ova
yaze
mly
a 19
61 H
-bo
mb
test
askj
a 19
61
1960
1958
1951
1949
Hel
ka 1
947
1942
1941
Plates ia and ib
micro-resolution records of simultaneous nitrate concentrations in relative units (bluecurve) and liquid conductivity (orange curve)from the central greenland ice sheet. the x-axis is proporational to the true depth belowthe surface (122m) and has not been adjust-ed for compaction. nitrate background dis-plays a prominent seasonal cycle. the nitrate anomalies are apparently caused in mostcasas by individuals solar particle events(dates have been marked in blue). black ar-rows at the bottom of the graph indicate timesof sunspot maxima (up) and sunspot minima(down). the numbers at the top of the graph indicate the approximate summer peaks ofthe years of the most recent maximum insolar activity. asterisks next to major peaks indicate that these anomalies are part of theongoing evaluattion programs. areas of gray shading represent portions of the core resam-pled for confirmation. Absorbance units (100 x 10-4 ) convert to 20.4 μg/l NO3-N or 90.3 ng/g no3. anomalous conductivity peaks indicate the years of specific volcanic eruptions.
1929
1928
rai
koke
192
4
1922
Hel
ka 1
693
tam
bor
a 18
15