ENSO-related rainfall changes over the New Guinea region
Article
Article Title | ENSO-related rainfall changes over the New Guinea region |
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ERA Journal ID | 210881 |
Article Category | Article |
Authors | Smith, Ian (Author), Moise, Aurel (Author), Inape, Kasis (Author), Murphy, Brad (Author), Colman, Rob (Author), Power, Scott (Author) and Chung, Christine (Author) |
Journal Title | Journal of Geophysical Research: Atmospheres |
Journal Citation | 118 (19), pp. 10,665-10,675 |
Number of Pages | 11 |
Year | 2013 |
Place of Publication | United States |
ISSN | 2169-897X |
2169-8996 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/jgrd.50818 |
Web Address (URL) | https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/jgrd.50818 |
Abstract | The large-scale nature of El Niño-Southern Oscillation (ENSO) impacts on rainfall in the western Pacific region is generally well known but in some regions, where there are relatively few observations and the terrain is mountainous, the details of the impacts are less obvious. Here we analyze rainfall data for the New Guinea region comprising station observations, reanalysis products, and satellite-based estimates in order to better understand some of these details. We find that most gridded products are limited due to their relatively coarse horizontal resolutions that fail to resolve topographic effects. However, the relatively fine resolution Tropical Rainfall Measurement Mission satellite-based product appears to provide reliable estimates and linear correlations between the data and the NINO34 sea surface temperature index provides an insight into the pattern of ENSO rainfall impacts. The first major finding is that the correlation patterns reveal that some highland regions are impacted differently to other surrounding regions, most likely because of the interaction between winds and topography. Second, we find that the association between ENSO and rainfall for stations in the New Ireland/New Britain region tends to be nonlinear, in the sense that warm (El Niño)/cool (La Niña) events cause a decrease in rainfall - the strong 2010-2011 La Niña event being a clear example. Both findings help explain why previous studies have tended not to identify a simple large-scale response of New Guinea rainfall to ENSO. Key Points Patterns of ENSO-related rainfall impacts over New Guinea are complex. Satellite-based rainfall estimates (TRMM)provide details about these impacts. There is evidence of non-linear relationships for some regions. ©2013. American Geophysical Union. All Rights Reserved. |
Keywords | meteorology; applied Mathematics; FLUIDEX; applications; atmosphere; air-sea interaction; correlation patterns; ENSO; horizontal resolution; New Guinea; NINO34; non-linear relationships; sea surface temperature (SST); tropical rainfall measurement missions; rainfall |
ANZSRC Field of Research 2020 | 370202. Climatology |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Australian Bureau of Meteorology |
National Weather Service, Papua New Guinea | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q66yx/enso-related-rainfall-changes-over-the-new-guinea-region
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