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| Titel |
Interannual variability of isotopic composition in water vapor over western Africa and its relationship to ENSO |
| VerfasserIn |
A. Okazaki, Y. Satoh, G. Tremoy, F. Vimeux, R. Scheepmaker, K. Yoshimura |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 6 ; Nr. 15, no. 6 (2015-03-20), S.3193-3204 |
| Datensatznummer |
250119567
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| Publikation (Nr.) |
 copernicus.org/acp-15-3193-2015.pdf |
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| Zusammenfassung |
| This study was performed to examine the relationship between
isotopic composition in near-surface vapor (δ18Ov) over
western Africa during the monsoon season and El Niño–Southern
Oscillation (ENSO) activity using the Isotope-incorporated Global Spectral
Model. The model was evaluated using a satellite and in situ observations at
daily to interannual timescales. The model provided an accurate simulation of
the spatial pattern and seasonal and interannual variations of isotopic
composition in column and surface vapor and precipitation over western
Africa. Encouraged by this result, we conducted a simulation stretching 34
years (1979–2012) to investigate the relationship between atmospheric
environment and isotopic signature on an interannual timescale. The
simulation indicated that the depletion in the monsoon season does not appear
every year at Niamey. The major difference between the composite fields with
and without depletion was in the amount of precipitation in the upstream area
of Niamey. As the interannual variation of the precipitation amount is
influenced by the ENSO, we regressed the monsoon season averaged
δ18Ov from the model and annually averaged
NINO3 index and
found a statistically significant correlation (R = 0.56,
P < 0.01) at Niamey. This relationship suggests that there is a
possibility of reconstructing past western African monsoon activity and ENSO
using climate proxies. |
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