An objective classification of climatic regions in the Pacific and Indian oceans
We have applied a number of objective statistical techniques to define homogeneous climatic regions for the Pacific Ocean, using COADS (Woodruff et al 1987) monthly sea surface temperature (SST) for 1950-1989 as the key variable. The basic data comprised all global 4°x4° latitude/longitude boxes with enough data available to yield reliable long-term means of monthly mean SST. An R-mode principal components analysis of these data, following a technique first used by Stidd (1967), yields information about harmonics of the annual cycles of SST. We used the spatial coefficients (one for each 4-degree box and eigenvector) as input to a K-means cluster analysis to classify the gridbox SST data into 34 global regions, in which 20 comprise the Pacific and Indian oceans. Seasonal time series were then produced for each of these regions. For comparison purposes, the variance spectrum of each regional anomaly time series was calculated. Most of the significant spectral peaks occur near the biennial (2.1-2.2 years) and ENSO (~3-6 years) time scales in the tropical regions. Decadal scale fluctuations are important in the mid-latitude ocean regions.
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Format: | conference_item biblioteca |
Language: | English |
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1993-03
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Subjects: | Atmospheric Sciences, Oceanography, PACLIM, |
Online Access: | http://hdl.handle.net/1834/30447 |
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dig-aquadocs-1834-304472021-06-28T03:18:20Z An objective classification of climatic regions in the Pacific and Indian oceans Diaz, Henry F. Brown, Timothy J. Atmospheric Sciences Oceanography PACLIM We have applied a number of objective statistical techniques to define homogeneous climatic regions for the Pacific Ocean, using COADS (Woodruff et al 1987) monthly sea surface temperature (SST) for 1950-1989 as the key variable. The basic data comprised all global 4°x4° latitude/longitude boxes with enough data available to yield reliable long-term means of monthly mean SST. An R-mode principal components analysis of these data, following a technique first used by Stidd (1967), yields information about harmonics of the annual cycles of SST. We used the spatial coefficients (one for each 4-degree box and eigenvector) as input to a K-means cluster analysis to classify the gridbox SST data into 34 global regions, in which 20 comprise the Pacific and Indian oceans. Seasonal time series were then produced for each of these regions. For comparison purposes, the variance spectrum of each regional anomaly time series was calculated. Most of the significant spectral peaks occur near the biennial (2.1-2.2 years) and ENSO (~3-6 years) time scales in the tropical regions. Decadal scale fluctuations are important in the mid-latitude ocean regions. 2021-06-24T16:51:38Z 2021-06-24T16:51:38Z 1993-03 conference_item http://hdl.handle.net/1834/30447 en application/pdf application/pdf 55-62 http://aquaticcommons.org/id/eprint/14577 8 2014-10-27 19:07:30 14577 |
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Atmospheric Sciences Oceanography PACLIM Atmospheric Sciences Oceanography PACLIM Diaz, Henry F. Brown, Timothy J. An objective classification of climatic regions in the Pacific and Indian oceans |
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We have applied a number of objective statistical techniques to define homogeneous climatic regions for the Pacific Ocean, using COADS (Woodruff et al 1987) monthly sea surface temperature (SST) for 1950-1989 as the key variable. The basic data comprised all global 4°x4° latitude/longitude boxes with enough data available to yield reliable long-term means of monthly mean SST. An R-mode principal components analysis of these data, following a technique first used by Stidd (1967), yields information about harmonics of the annual cycles of SST. We used the spatial coefficients (one for each 4-degree box and eigenvector) as input to a K-means cluster analysis to classify the gridbox SST data into 34 global regions, in which 20 comprise the Pacific and Indian oceans. Seasonal time series were then produced for each of these regions. For comparison purposes, the variance spectrum of each regional anomaly time series was calculated. Most of the significant spectral peaks occur near the biennial (2.1-2.2 years) and ENSO (~3-6 years) time scales in the tropical regions. Decadal scale fluctuations are important in the mid-latitude ocean regions. |
format |
conference_item |
topic_facet |
Atmospheric Sciences Oceanography PACLIM |
author |
Diaz, Henry F. Brown, Timothy J. |
author_facet |
Diaz, Henry F. Brown, Timothy J. |
author_sort |
Diaz, Henry F. |
title |
An objective classification of climatic regions in the Pacific and Indian oceans |
title_short |
An objective classification of climatic regions in the Pacific and Indian oceans |
title_full |
An objective classification of climatic regions in the Pacific and Indian oceans |
title_fullStr |
An objective classification of climatic regions in the Pacific and Indian oceans |
title_full_unstemmed |
An objective classification of climatic regions in the Pacific and Indian oceans |
title_sort |
objective classification of climatic regions in the pacific and indian oceans |
publishDate |
1993-03 |
url |
http://hdl.handle.net/1834/30447 |
work_keys_str_mv |
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_version_ |
1756078694482313216 |