A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation
Abstract Empirical orthogonal function (EOF) analysis is widely adopted for identifying spatial patterns in regular latitude‐longitude gridded geographical data. However, a standard EOF analysis could underestimate variances from low latitudes due to the increasing grid cell areas when moving toward...
Published in: | International Journal of Climatology |
---|---|
Main Authors: | , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2024
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/joc.8353 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8353 |
id |
crwiley:10.1002/joc.8353 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/joc.8353 2024-06-02T08:11:09+00:00 A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation Li, Dongshuang Pan, Liming Wang, Jian Shi, Chunhua Yu, Zhaoyuan Yuan, Linwang National Natural Science Foundation of China Postdoctoral Science Foundation of Jiangsu Province 2024 http://dx.doi.org/10.1002/joc.8353 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8353 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 44, issue 3, page 748-758 ISSN 0899-8418 1097-0088 journal-article 2024 crwiley https://doi.org/10.1002/joc.8353 2024-05-03T11:43:59Z Abstract Empirical orthogonal function (EOF) analysis is widely adopted for identifying spatial patterns in regular latitude‐longitude gridded geographical data. However, a standard EOF analysis could underestimate variances from low latitudes due to the increasing grid cell areas when moving toward the equator. A broadly adopted compensating approach is the area‐weighted EOF, where the grid data are multiplied by a factor proportional to the grid area, thereby forcing each datum to represent identical areas. In this article, we revisit the area‐weighting scheme and discuss its potential drawbacks. In particular, we show that along with compensating the unequal areas, another unaddressed issue is which region of the data is more relevant to our focused problem. We propose a regional attentive EOF (RA‐EOF) method, which resolves area‐compensation and region selection simultaneously. We conduct case studies of the North Atlantic Oscillation (NAO) analysis and perform RA‐EOF to the sea level pressure variability in the North Atlantic sector. Experiments show that our method evidently detects the NAO pattern in the leading mode of sea level pressure variability and suggests the southwestward movement of the southern action centre of NAO during the summers. Our findings clarify the ambiguity about the summer NAO in previous studies. The proposed methodology provides a potent instrument for discerning the spatial distribution and analysing the temporal variability of atmospheric teleconnections and oscillations, particularly in cases characterized by weak signal strength. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library International Journal of Climatology 44 3 748 758 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Empirical orthogonal function (EOF) analysis is widely adopted for identifying spatial patterns in regular latitude‐longitude gridded geographical data. However, a standard EOF analysis could underestimate variances from low latitudes due to the increasing grid cell areas when moving toward the equator. A broadly adopted compensating approach is the area‐weighted EOF, where the grid data are multiplied by a factor proportional to the grid area, thereby forcing each datum to represent identical areas. In this article, we revisit the area‐weighting scheme and discuss its potential drawbacks. In particular, we show that along with compensating the unequal areas, another unaddressed issue is which region of the data is more relevant to our focused problem. We propose a regional attentive EOF (RA‐EOF) method, which resolves area‐compensation and region selection simultaneously. We conduct case studies of the North Atlantic Oscillation (NAO) analysis and perform RA‐EOF to the sea level pressure variability in the North Atlantic sector. Experiments show that our method evidently detects the NAO pattern in the leading mode of sea level pressure variability and suggests the southwestward movement of the southern action centre of NAO during the summers. Our findings clarify the ambiguity about the summer NAO in previous studies. The proposed methodology provides a potent instrument for discerning the spatial distribution and analysing the temporal variability of atmospheric teleconnections and oscillations, particularly in cases characterized by weak signal strength. |
author2 |
National Natural Science Foundation of China Postdoctoral Science Foundation of Jiangsu Province |
format |
Article in Journal/Newspaper |
author |
Li, Dongshuang Pan, Liming Wang, Jian Shi, Chunhua Yu, Zhaoyuan Yuan, Linwang |
spellingShingle |
Li, Dongshuang Pan, Liming Wang, Jian Shi, Chunhua Yu, Zhaoyuan Yuan, Linwang A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation |
author_facet |
Li, Dongshuang Pan, Liming Wang, Jian Shi, Chunhua Yu, Zhaoyuan Yuan, Linwang |
author_sort |
Li, Dongshuang |
title |
A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation |
title_short |
A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation |
title_full |
A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation |
title_fullStr |
A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation |
title_full_unstemmed |
A regional attentive empirical orthogonal function analysis: An application to North Atlantic Oscillation |
title_sort |
regional attentive empirical orthogonal function analysis: an application to north atlantic oscillation |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/joc.8353 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8353 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 44, issue 3, page 748-758 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.8353 |
container_title |
International Journal of Climatology |
container_volume |
44 |
container_issue |
3 |
container_start_page |
748 |
op_container_end_page |
758 |
_version_ |
1800757199400599552 |