Beschreibung
The El Niño-Southern Oscillation (ENSO) is linked with energy exchange between the ocean, atmosphere and space. ENSO is well known for its far reaching effects on weather and climate, but how exactly energy from the Nino3.4 region is transported through the atmosphere is still uncertain. By using the particle dispersion model FLEXPART the atmospheric energy transport originating from the Tropical Pacific is analysed, with special focus on the impacts on remote regions (e.g. NW-America and SE-Asia). In the Lagrangian model, the atmosphere was filled homogeneously with five million, globally distributed particles, which were then traced forward in time. In this domain-filling mode of FLEXPART, the particles represent the global atmospheric mass transport. From this Lagrangian Reanalysis Dataset, the air masses transported from the Nino3.4 region (5°S-5°N, 170°W-120°W and below 1 km) were selected and followed at least 3 weeks forward in time. By tracing these air masses, we can find the atmospheric circulation patterns associated with ENSO, but also less prominent features such as the export of air to the extratropics. Beyond that, we can diagnose how the moisture and heat content of these air masses are changing along their transport pathways and analyse the differences between El Niño and La Niña. Furthermore, the atmospheric transport is compared with the ERA5 data in order to establish a direct link to occurring anomalies. For example, we can explain how the warm anomalies in NW-America during El Niño are linked directly to the transported air mass from the Nino3.4 region. Thus, with this Lagrangian technique it is possible to gain better understanding of the atmospheric impacts of ENSO.| Zeitraum | 13 Dez. 2021 → 17 Dez. 2021 |
|---|---|
| Ereignistitel | AGU Fall Meeting 2021 |
| Veranstaltungstyp | Konferenz |
| Ort | New Orleans, USA / Vereinigte StaatenAuf Karte anzeigen |