dc.contributor.advisor |
Shamseldin, A |
en |
dc.contributor.author |
Sadeghi, Leila |
en |
dc.date.accessioned |
2016-01-04T23:40:06Z |
en |
dc.date.issued |
2015 |
en |
dc.identifier.citation |
2015 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/27865 |
en |
dc.description |
Full text is available to authenticated members of The University of Auckland only. |
en |
dc.description.abstract |
In this thesis, the spatial and temporal variability of droughts are investigated for New Zealand based on the monthly rainfall data from 39 rain gauge stations distributed uniformly over the both islands, covering the common period of 1965-2013. The drought events were characterized using the Standardized Precipitation Index (SPI) applied to the different time scales of 1, 3, 6 and 12 consecutive months. To assess spatial and temporal patterns of droughts, the Principal Component Analysis (PCA) was applied to the SPI series. In this way, six distinctive and spatially well-defined regions with different temporal evolution of droughts were identified for the short term (1 and 3- month time scales) droughts. For long-term droughts (6 and 12- month time scales) the quantity of the identified homogenous regions in terms of drought variability increased to seven. The drought events and their onset, end, intensity and duration were recognized using the time variability of the Rotated Principal Component (RPC) scores of SPI at the different time scales. The signified spatial patterns of drought were consistent with the spatial patterns of rainfall anomalies in New Zealand which signified six homogenous and distinctive patterns for rainfall variability. The detected drought regions are also in agreement with the classification of New Zealand climate zones and showed the distinctive and individual climate characteristics in each identified drought regions. The comparison of the results of this study with the previous research on the drought spatial pattern in New Zealand (Salinger and Porteous, 2013), showed a relatively similar homogenous patterns. Finally, the corresponding Southern Oscillation Index (SOI) for the period of the detected drought events in each identified drought pattern was also investigated to examine the impacts of El Nino Southern Oscillation (ENSO) on the drought events in each detected drought region. |
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dc.publisher |
ResearchSpace@Auckland |
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dc.relation.ispartof |
Masters Thesis - University of Auckland |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights |
Restricted Item. Available to authenticated members of The University of Auckland. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
The Spatial and Temporal Characteristics of Droughts in New Zealand |
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dc.type |
Thesis |
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thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Masters |
en |
dc.rights.holder |
Copyright: The Author |
en |
pubs.elements-id |
515816 |
en |
pubs.record-created-at-source-date |
2016-01-05 |
en |
dc.identifier.wikidata |
Q112910546 |
|