Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors
Abstract Understanding the unevenness of precipitation distribution within a year is important for water resources management and agricultural production. In this study, spatiotemporal variations of precipitation unevenness in the Yangtze River basin (YRB) during 1961–2020 and its main influencing f...
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Online Access: | http://dx.doi.org/10.1002/joc.8135 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8135 |
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crwiley:10.1002/joc.8135 2024-06-02T08:11:39+00:00 Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors Li, Jiajia He, Xinguang Chen, Ajiao Tao, Lizhi Hunan Provincial Innovation Foundation for Postgraduate National Natural Science Foundation of China 2023 http://dx.doi.org/10.1002/joc.8135 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8135 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 43, issue 11, page 5112-5129 ISSN 0899-8418 1097-0088 journal-article 2023 crwiley https://doi.org/10.1002/joc.8135 2024-05-03T10:37:46Z Abstract Understanding the unevenness of precipitation distribution within a year is important for water resources management and agricultural production. In this study, spatiotemporal variations of precipitation unevenness in the Yangtze River basin (YRB) during 1961–2020 and its main influencing factors are investigated by the relative entropy (RE) and rotated empirical orthogonal function. The timings of different percentiles of annual total precipitation show that the temporal distribution of precipitation in the YRB is uneven. The unevenness of precipitation distribution exhibits a large spatial variability with a high‐value centre in the northeast and a low value centre in the northwest of the YRB, and an upward trend in almost the entire YRB. Precipitation becomes more uneven with the decrease of annual number of wet days and low‐intensity precipitation amount and the increase of high‐intensity precipitation amount during the study period. Precipitation unevenness of different regions is modulated by the different combinations of different seasonal climate indices with specific time lags. For example, in the south‐central YRB, precipitation unevenness generally tends to be enhanced by the positive Tropical Northern Atlantic Index in current summer and sea surface temperature anomalies over South China Sea (SCS) in previous summer, and negative North Atlantic Oscillation in current winter, while in the northeast YRB, be weakened by negative Quasi‐Biennial Oscillation in current spring, Atlantic Meridional Mode in current summer and positive SCS in current autumn. Besides, the identified significant climate indices can partly explain the temporal changes of precipitation unevenness, and their explanatory ability is more powerful in the south‐central, southeast and northwest YRB than in the north‐central and northeast YRB, which reveals a strong negative correlation with the degree of precipitation unevenness. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library International Journal of Climatology 43 11 5112 5129 |
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Wiley Online Library |
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English |
description |
Abstract Understanding the unevenness of precipitation distribution within a year is important for water resources management and agricultural production. In this study, spatiotemporal variations of precipitation unevenness in the Yangtze River basin (YRB) during 1961–2020 and its main influencing factors are investigated by the relative entropy (RE) and rotated empirical orthogonal function. The timings of different percentiles of annual total precipitation show that the temporal distribution of precipitation in the YRB is uneven. The unevenness of precipitation distribution exhibits a large spatial variability with a high‐value centre in the northeast and a low value centre in the northwest of the YRB, and an upward trend in almost the entire YRB. Precipitation becomes more uneven with the decrease of annual number of wet days and low‐intensity precipitation amount and the increase of high‐intensity precipitation amount during the study period. Precipitation unevenness of different regions is modulated by the different combinations of different seasonal climate indices with specific time lags. For example, in the south‐central YRB, precipitation unevenness generally tends to be enhanced by the positive Tropical Northern Atlantic Index in current summer and sea surface temperature anomalies over South China Sea (SCS) in previous summer, and negative North Atlantic Oscillation in current winter, while in the northeast YRB, be weakened by negative Quasi‐Biennial Oscillation in current spring, Atlantic Meridional Mode in current summer and positive SCS in current autumn. Besides, the identified significant climate indices can partly explain the temporal changes of precipitation unevenness, and their explanatory ability is more powerful in the south‐central, southeast and northwest YRB than in the north‐central and northeast YRB, which reveals a strong negative correlation with the degree of precipitation unevenness. |
author2 |
Hunan Provincial Innovation Foundation for Postgraduate National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Li, Jiajia He, Xinguang Chen, Ajiao Tao, Lizhi |
spellingShingle |
Li, Jiajia He, Xinguang Chen, Ajiao Tao, Lizhi Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors |
author_facet |
Li, Jiajia He, Xinguang Chen, Ajiao Tao, Lizhi |
author_sort |
Li, Jiajia |
title |
Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors |
title_short |
Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors |
title_full |
Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors |
title_fullStr |
Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors |
title_full_unstemmed |
Unevenness of temporal distribution of precipitation over the Yangtze River basin and its main influencing factors |
title_sort |
unevenness of temporal distribution of precipitation over the yangtze river basin and its main influencing factors |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/joc.8135 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8135 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 43, issue 11, page 5112-5129 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.8135 |
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International Journal of Climatology |
container_volume |
43 |
container_issue |
11 |
container_start_page |
5112 |
op_container_end_page |
5129 |
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1800757862250577920 |