39
2
-2
"" "
I,: :.: ., ...
1910
1930
1950
1970
1990
1910
1930
1950
1970
1990
2
;-"" "~":. :.!"::-!""::":-"" ",' ~w";":":~
... • """I " •
...
" ~~
~
""'"
".
. ~
. . Ii-:: .. ;:-. \ ; ... . .. e:
. - . •• : :
~.
• • • • • •
•
-: . . . . . .
' I
•
. -:;':'! ?... :. .
.
.• .
-2
1910
1930
1950
1970
1990
Figure 2: Time series of monthly-mean surface air temperature anomalies based on the
gridded data set compiled by Jones et al. (1985) under the sponsorship of the United
States Department of Energy, obtained from the Carbon Dioxide Information Analysis
Center (CDIAC). The reference period for computing the anomalies is 1951-80. Upper left
panel: the 5 degree latitude x 5 degree longitude grid box centered at (92.5 N, 42.5 W)
in the central United States. Many of the individual monthly values lie outside the range
of the diagram'. Upper right panel: the corresponding time series for the area bounded by
(25 and 55 N, 70 and 120 W), which corresponds roughly to the contiguous United States.
Lower left panel: the Northern Hemispheric-mean based on all available grid points. The
scale on the vertical axis is the same in all three panels.
hemispheric-mean temperature anomalies is more clearly apparent in the
5-year running mean time series shown in Fig. 3.
It is notable that most of the remaining month-to-month scatter in the
lower panel of Fig. 2 is contributed by the cold season months, November
through April, as shown in Fig 4. It is also evident from the figure that
2
-2
"" "
I,: :.: ., ...
1910
1930
1950
1970
1990
1910
1930
1950
1970
1990
2
;-"" "~":. :.!"::-!""::":-"" ",' ~w";":":~
... • """I " •
...
" ~~
~
""'"
".
. ~
. . Ii-:: .. ;:-. \ ; ... . .. e:
. - . •• : :
~.
• • • • • •
•
-: . . . . . .
' I
•
. -:;':'! ?... :. .
.
.• .
-2
1910
1930
1950
1970
1990
Figure 2: Time series of monthly-mean surface air temperature anomalies based on the
gridded data set compiled by Jones et al. (1985) under the sponsorship of the United
States Department of Energy, obtained from the Carbon Dioxide Information Analysis
Center (CDIAC). The reference period for computing the anomalies is 1951-80. Upper left
panel: the 5 degree latitude x 5 degree longitude grid box centered at (92.5 N, 42.5 W)
in the central United States. Many of the individual monthly values lie outside the range
of the diagram'. Upper right panel: the corresponding time series for the area bounded by
(25 and 55 N, 70 and 120 W), which corresponds roughly to the contiguous United States.
Lower left panel: the Northern Hemispheric-mean based on all available grid points. The
scale on the vertical axis is the same in all three panels.
hemispheric-mean temperature anomalies is more clearly apparent in the
5-year running mean time series shown in Fig. 3.
It is notable that most of the remaining month-to-month scatter in the
lower panel of Fig. 2 is contributed by the cold season months, November
through April, as shown in Fig 4. It is also evident from the figure that