ENSO surface shortwave radiation forcing over the tropical Pacific
| dc.contributor.author | Pavlakis, K. G. | en |
| dc.contributor.author | Hatzianastassiou, N. | en |
| dc.contributor.author | Matsoukas, C. | en |
| dc.contributor.author | Fotiadi, A. | en |
| dc.contributor.author | Vardavas, I. | en |
| dc.date.accessioned | 2015-11-24T18:29:05Z | |
| dc.date.available | 2015-11-24T18:29:05Z | |
| dc.identifier.issn | 1680-7316 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16225 | |
| dc.rights | Default Licence | - |
| dc.subject | nino-southern-oscillation | en |
| dc.subject | ocean recharge paradigm | en |
| dc.subject | 1997/98 el-nino | en |
| dc.subject | global distribution | en |
| dc.subject | climatological data | en |
| dc.subject | conceptual-model | en |
| dc.subject | atmosphere | en |
| dc.subject | budget | en |
| dc.subject | indexes | en |
| dc.subject | precipitation | en |
| dc.title | ENSO surface shortwave radiation forcing over the tropical Pacific | en |
| heal.abstract | We have studied the spatial and temporal variation of the downward shortwave radiation (DSR) at the surface of the Earth during ENSO events for a 21-year period over the tropical and subtropical Pacific Ocean (40 degrees S-40 degrees N, 90 degrees E-75 degrees W). The fluxes were computed using a deterministic model for atmospheric radiation transfer, along with satellite data from the ISCCP-D2 database, reanalysis data from NCEP/ NCAR for the key atmospheric and surface input parameters, and aerosol parameters from GADS (acronyms explained in main text). A clear anti-correlation was found between the downward shortwave radiation anomaly (DSR-A) time-series, in the region 7 degrees S-5 degrees N 160 degrees E-160 degrees W located west of the Nino-3.4 region, and the Nino-3.4 index timeseries. In this region where the highest in absolute value DSR anomalies are observed, the mean DSR anomaly values range from-45 Wm(-2) during El Nino episodes to + 40Wm(-2) during La Nina events. Within the Nina 3.4 region no significant DSR anomalies are observed during the cold ENSO phase in contrast to the warm ENSO phase. A high correlation was also found over the western Pacific (10 degrees S-5 degrees N, 120-140 degrees E), where the mean DSR anomaly values range from + 20Wm(-2) to-20Wm(-2) during El Nino and La Nina episodes, respectively. There is also convincing evidence that the time series of the mean downward shortwave radiation anomaly in the off-equatorial western Pacific region 7-15 degrees N 150-170 degrees E, precedes the Nino-3.4 index time-series by about 7 months and the pattern of this anomaly is indicative of ENSO operating through the mechanism of the western Pacific oscillator. Thus, the downward shortwave radiation anomaly is a complementary index to the SST anomaly for the study of ENSO events and can be used to assess whether or not El Nino or La Nina conditions prevail. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://000259647500004 | - |
| heal.journalName | Atmospheric Chemistry and Physics | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2008 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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