Observational data consisting of gridded
monthly sea surface temperature (SST) from
Kaplan , gridded monthly precipitation from Hulme
and various atmospheric variables from the NCEPNCAR
Reanalysis are utilized. In addition, monthly
rainfall data for stations in NVE were obtained from
the Global Historical Climatology Network. The
base period of the study is 1950-1999.
To investigate the potential influence of the
tropical ocean basins on rainfall in NVE we first
compute simple linear, contemporaneous and
lagged correlations between monthly and seasonal
rainfall anomalies averaged across NVE (60-70W,
centered on 10N) and tropical SST anomalies in
both the tropical Atlantic and Pacific. We define
the seasons as the 3-month periods DJF, MAM,
etc.
Contemporaneous Correlations
We focus on the JJA and SON seasons. Fig. 1
indicates the contemporaneous linear correlation
between anomalous rainfall in NVE and SST
anomalies. For the JJA season, the figure
indicates the only statistically significant
correlations are found in the tropical North Atlantic
and Caribbean, while negative correlations, mainly
in the eastern tropical Pacific and Caribbean,
dominate during SON. The boxes in Fig. 1 indicate
the Nino 3 region in the eastern Pacific and a
region in the tropical North Atlantic that we will call
the NATL region, after Enfield (1996).
Observational data consisting of gridded
monthly sea surface temperature (SST) from
Kaplan , gridded monthly precipitation from Hulme
and various atmospheric variables from the NCEPNCAR
Reanalysis are utilized. In addition, monthly
rainfall data for stations in NVE were obtained from
the Global Historical Climatology Network. The
base period of the study is 1950-1999.
To investigate the potential influence of the
tropical ocean basins on rainfall in NVE we first
compute simple linear, contemporaneous and
lagged correlations between monthly and seasonal
rainfall anomalies averaged across NVE (60-70W,
centered on 10N) and tropical SST anomalies in
both the tropical Atlantic and Pacific. We define
the seasons as the 3-month periods DJF, MAM,
etc.
Contemporaneous Correlations
We focus on the JJA and SON seasons. Fig. 1
indicates the contemporaneous linear correlation
between anomalous rainfall in NVE and SST
anomalies. For the JJA season, the figure
indicates the only statistically significant
correlations are found in the tropical North Atlantic
and Caribbean, while negative correlations, mainly
in the eastern tropical Pacific and Caribbean,
dominate during SON. The boxes in Fig. 1 indicate
the Nino 3 region in the eastern Pacific and a
region in the tropical North Atlantic that we will call
the NATL region, after Enfield (1996).
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