Geoscience Reference
In-Depth Information
with various monthly/seasonal TCIs series. These months and seasons are
(i) the months from January to May and two seasons DJF (December,
January, and February) and MAM (March, April, and May), antecedent to
summer monsoon season, (ii) the months from June to September and a
season JJA (June, July, and August), concurrent to the summer monsoon,
and (iii) the months October, November, December and two seasons SON+
(September, October, and November), and DJF+ (December, January, and
February), the succeeding periods with respect to the summer monsoon
season.
The analysis shows several significant correlations on which our
discussion will be restricted. Table 1 shows the CCs between Indian summer
monsoon rainfall and TCI series for the period 1953-1982 along with their
levels of significance.
As far as concurrent relationships are considered, Table 1 shows
significant negative CC of
0.37 (at 5% level) between TCI (A-M) JJA
and NWR. In addition, significant negative CCs are also obtained between
concurrent August TCI (A-M) and AIR, NWR, and PIR (CC =
−
0.51,
−
0.51, and
0.48, all at 1% level). September TCI (A-M) and PIR show
−
−
Table 1. Correlation coecients (CCs
×
100) between Indian summer monsoon rainfall
and monthly/seasonal TCIs.
Months/Season
AIR
NWR PIR
Months/Season
AIR
NWR PIR
TCI(A-M) Aug(0)
−
51
(1)
−
51
(1)
−
48
(1)
TCI(C-N) Feb(
−
)
−
50
(1)
−
42
(2)
−
38
(5)
−
42
(2)
TCI(C-N) Apr(
−
)
−
39
(5)
−
38
(5)
TCI(A-N) Sep(0)
−
33
−
24
−
17
−
37
(5)
TCI(C-N) Jun(0)
−
42
(2)
−
37
(5)
−
44
(2)
TCI(A-M) JJA(0)
−
22
−
15
TCI(A-N) May(
−
)
(5)
−
37
(5)
−
38
(5)
33
20
TCI(C-N) Jul(0)
−
28
−
47
(1)
−
47
(1)
−
42
(2)
TCI(C-N) JJA(0)
−
44
(2)
−
43
(2)
−
38
(5)
TCI(A-N) Jul(0)
−
42
(2)
TCI(C-N) Nov(+)
−
56
(1)
−
48
(1)
TCI(A-N) JJA(0)
−
32
−
33
−
34
TCI(A-N) DJF(+)
−
46
(1)
−
52
(1)
TCI(C-N) Dec(+)
−
42
(2)
−
37
(5)
−
32
−
26
TCI(A-C) Feb(
−
)
(5)
46
(1)
TCI(C-N) SON(+)
−
38
(5)
23
−
22
−
27
37
(5)
36
(5)
TCI(C-N) DJF(+)
−
41
(5)
−
39
(5)
TCI(A-C) Oct(+)
18
−
15
49
(1)
40
(5)
−
39
(5)
TCI(A-C) Nov(+)
28
TCI(I-N) Jan(
−
)
−
31
−
27
41
(5)
TCI(I-N) May(
−
)
(1)
39
(5)
TCI(A-C) SON(+)
23
23
31
TCI(C-M) Aug(0)
−
70
(
.
1)
−
66
(
.
1)
−
58
(
.
1)
TCI(I-N) Jul(0)
−
43
(2)
−
39
(5)
−
23
TCI(C-M) JJA(0)
−
51
(1)
−
49
(1)
−
41
(5)
36
(5)
TCI(I-N) Sep(0)
29
14
TCI(C-M) Oct(+)
−
46
(1)
−
39
(5)
TCI(I-N) JJA(0)
−
39
(5)
−
37
(5)
−
35
−
33
TCI(C-M) Nov(+)
−
41
(5)
TCI(I-N) DJF(+)
−
61
(
.
1)
−
61
(
.
1)
−
57
(
.
1)
−
24
−
34
TCI(C-M) SON(+)
−
54
(1)
−
41
(5)
−
43
(2)
TCI(I-M) Jan(
−
)
−
37
(5)
−
50
(1)
−
30
TCI(I-M) DJF(
−
)
−
16
−
40
(5)
−
16
TCI(I-M) Aug(0)
−
51
(1)
−
49
(1)
−
41
(5)
TCI(I-M) JJA(0)
−
36
(5)
−
28
−
28
TCI(I-M) DJF(+)
−
61
(
.
1)
−
64
(
.
1)
−
57
(
.
1)
Notes
:
(
.
1)
,
(1)
,
(2)
and
(5)
stand for 0.1%, 1%, 2%, and 5% significant level; (
−
), (0),
(+) stand for antecedent, concurrent, and succeeding periods.
