Investigating the impact of ENSO and IOD on the South West Land Division
Document Type
Report
Publication Date
5-24-2024
Journal Title
Grains Research and Development Corporation
Keywords
Indian Ocean Dipole, IOD, El Niño Southern Oscillation, ENSO, Southern Oscillation Index, SOI, El Niño events, South West Land Division, SWLD
Disciplines
Atmospheric Sciences | Climate | Oceanography
Abstract
Since 2000, El Niño Southern Oscillation (ENSO): El Niño events, have reduced May-June rainfall for some western parts of the South West Land Division (SWLD).
Since 2000, negative IOD events are associated with wetter May-June rainfall, while positive IOD, had drier rainfall, fewer nights below 2°C, and more days above 30°C in August-September.
Since 1960, when ENSO and IOD events combine, La Niña/negative IOD events have higher May-June rainfall. El Niño/positive IOD combined events influence August-September temperature with fewer nights below 2°C, and more widespread occurrence of days above 30°C in the SWLD.
Growers can check ENSO and IOD event forecasts prior to the season to understand the predicted season types to help planning alongside decision support tools such as stored soil water and break of season maps.
Recommended Citation
Guthrie, M M,
Scanlon, T,
and
Bowran, D.
(2024), Investigating the impact of ENSO and IOD on the South West Land Division. Department of Primary Industries and Regional Development, Western Australia, Perth. Report.
https://library.dpird.wa.gov.au/cs_researchrpts/1
