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 griddedmonthly sea surface temperature (SST) fromKaplan , gridded monthly precipitation from Hulmeand various atmospheric variables from the NCEPNCARReanalysis are utilized. In addition, monthlyrainfall data for stations in NVE were obtained fromthe Global Historical Climatology Network. Thebase period of the study is 1950-1999. To investigate the potential influence of thetropical ocean basins on rainfall in NVE we firstcompute simple linear, contemporaneous andlagged correlations between monthly and seasonalrainfall anomalies averaged across NVE (60-70W,centered on 10N) and tropical SST anomalies inboth the tropical Atlantic and Pacific. We definethe seasons as the 3-month periods DJF, MAM,etc.Contemporaneous Correlations We focus on the JJA and SON seasons. Fig. 1indicates the contemporaneous linear correlationbetween anomalous rainfall in NVE and SSTanomalies. For the JJA season, the figureindicates the only statistically significantcorrelations are found in the tropical North Atlanticand Caribbean, while negative correlations, mainlyin the eastern tropical Pacific and Caribbean,dominate during SON. The boxes in Fig. 1 indicatethe Nino 3 region in the eastern Pacific and aregion in the tropical North Atlantic that we will callthe NATL region, after Enfield (1996).
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