ENSO-related rainfall changes over the New Guinea region

Smith, Ian and Moise, Aurel and Inape, Kasis and Murphy, Brad and Colman, Rob and Power, Scott and Chung, Christine (2013) ENSO-related rainfall changes over the New Guinea region. Journal of Geophysical Research: Atmospheres, 118 (19). 10,665-10,675. ISSN 2169-897X


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 21 Oct 2021 01:29
Last Modified: 21 Oct 2021 01:29
Uncontrolled 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
Fields of Research (2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Fields of Research (2020): 37 EARTH SCIENCES > 3702 Climate change science > 370202 Climatology
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9603 Climate and Climate Change > 960309 Effects of Climate Change and Variability on the South Pacific (excl. Australia and New Zealand) (excl. Social Impacts)
D Environment > 96 Environment > 9603 Climate and Climate Change > 960304 Climate Variability (excl. Social Impacts)
Socio-Economic Objectives (2020): 19 ENVIRONMENTAL POLICY, CLIMATE CHANGE AND NATURAL HAZARDS > 1905 Understanding climate change > 190502 Climate variability (excl. social impacts)
Identification Number or DOI: https://doi.org/10.1002/jgrd.50818
URI: http://eprints.usq.edu.au/id/eprint/42433

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