- Title
- Tropical cyclones and depressions over the South Pacific Ocean since the late 19th century : assessing synergistic relationship between the El Niño Southern Oscillation and Interdecadal Pacific Oscillation
- Creator
- Yeasmin, Alea; Chand, Savin; Sultanova, Nargiz
- Date
- 2023
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/198685
- Identifier
- vital:19095
- Identifier
-
https://doi.org/10.1002/joc.8154
- Identifier
- ISSN:0899-8418 (ISSN)
- Abstract
- Tropical cyclones (TCs) and tropical depressions (TDs), hereafter collectively referred to as tropical storms, often exhibit large year-to-year variability in the South Pacific Ocean basin. Many past studies have examined this variability in relation to the El Niño Southern Oscillation (ENSO) phenomenon, particularly using observational data from the post-satellite era (i.e., after the 1970s when TC observations became more consistent). However, less emphasis is placed on how tropical storms are modulated at interdecadal and decadal time scales such as due to Interdecadal Pacific Oscillation (IPO). This is because post-satellite data are available for relatively short time period (i.e., post-1970s), limiting our understanding of the IPO–TC relationship in the South Pacific. Here, using NOAA-CIRES 20th Century Reanalysis (20CR) dataset, we reconstruct historical records (1871–2014) of TC and depression proxies for the South Pacific Ocean basin, and then utilize these reconstructed proxies to first understand the connections between TC–ENSO and TC–IPO over the 20th century, and then investigate the combined effects of ENSO–IPO effects on TCs and depressions. Results show that La Niña (El Niño) is more dominant on TC activity than El Niño (La Niña) over the western subregion 140–170° E (eastern sub-region, 170–220° E) as expected. We also show that TC numbers are strongly modulated by the IPO phenomenon with, on average, more TCs occurring during the positive phase than during the negative phase of the IPO in both western and eastern sub-regions. We show for the first time (using a long-term reconstructed TC dataset) that the combined phases of El Niño and + IPO account for increased TC activity, as opposed to the combined phase of La Niña and
- Publisher
- John Wiley and Sons Ltd
- Relation
- International Journal of Climatology Vol. 43, no. 12 (2023), p. 5422-5443
- Rights
- All metadata describing materials held in, or linked to, the repository is freely available under a CC0 licence
- Rights
- http://creativecommons.org/licenses/by-nc-nd/4.0/
- Rights
- Copyright @ 2023 The Authors
- Rights
- Open Access
- Subject
- 3702 Climate change science; 3707 Hydrology; El Niño Southern Oscillation; Interdecadal Pacific Oscillation; Southwest Pacific; Tropical cyclones; Tropical depressions
- Full Text
- Reviewed
- Funder
- Alea Yeasmin was supported by both the Australian Government Research Training Program (RTP) Fee-Waiver and the RTP Stipend Awards through Federation University Australia.
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