Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China
Using ERA5 reanalysis data, we conducted an EOF analysis of summer precipitation in the eastern part of southwestern China (ESWC) over the past 60 years. Our study aimed to investigate the spatial distribution characteristics and interannual variability of summer precipitation in the ESWC, as well a...
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ftmdpi:oai:mdpi.com:/2073-4433/14/8/1230/ 2023-08-20T04:05:31+02:00 Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China Chuhan Lu Dingan Huang Bo Chen Yingying Bai agris 2023-07-31 application/pdf https://doi.org/10.3390/atmos14081230 EN eng Multidisciplinary Digital Publishing Institute Climatology https://dx.doi.org/10.3390/atmos14081230 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 14; Issue 8; Pages: 1230 eastern southwest China interannual causes of precipitation change sea surface temperature anomaly Text 2023 ftmdpi https://doi.org/10.3390/atmos14081230 2023-08-01T11:05:22Z Using ERA5 reanalysis data, we conducted an EOF analysis of summer precipitation in the eastern part of southwestern China (ESWC) over the past 60 years. Our study aimed to investigate the spatial distribution characteristics and interannual variability of summer precipitation in the ESWC, as well as to reveal the possible physical mechanisms influencing its interannual variability. The results indicate that, at the interannual scale, the first two modes of summer precipitation in the ESWC exhibit a uniform pattern and a north–south dipole pattern, respectively. The maximum and minimum time coefficients of the first mode correspond to the severe flood and drought events in 1998 and 2006, respectively, indicating that their time coefficients reflect the typical events well. The tri-pole sea surface temperature anomaly in the North Atlantic, along with the sea ice anomaly near the Barents Sea, induces a quasi-zonal wave train in the upper troposphere. This wave train propagates from the tropical and mid-latitude Atlantic, traverses the mid-high latitudes of Eurasia, and reaches the eastern part of China. The wave train induces cyclonic (anticyclonic) anomalies in the north (south) of the ESWC, facilitating the convergence of high-latitude dry and cold air with warm and moist southwesterly winds from the tropical ocean. This convergence promotes increased summer precipitation in the ESWC. We provided valuable insights into the interannual variability of summer precipitation in the ESWC, shedding light on the physical mechanisms responsible for these variations. Text Barents Sea North Atlantic Sea ice MDPI Open Access Publishing Barents Sea Atmosphere 14 8 1230 |
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Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
eastern southwest China interannual causes of precipitation change sea surface temperature anomaly |
spellingShingle |
eastern southwest China interannual causes of precipitation change sea surface temperature anomaly Chuhan Lu Dingan Huang Bo Chen Yingying Bai Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China |
topic_facet |
eastern southwest China interannual causes of precipitation change sea surface temperature anomaly |
description |
Using ERA5 reanalysis data, we conducted an EOF analysis of summer precipitation in the eastern part of southwestern China (ESWC) over the past 60 years. Our study aimed to investigate the spatial distribution characteristics and interannual variability of summer precipitation in the ESWC, as well as to reveal the possible physical mechanisms influencing its interannual variability. The results indicate that, at the interannual scale, the first two modes of summer precipitation in the ESWC exhibit a uniform pattern and a north–south dipole pattern, respectively. The maximum and minimum time coefficients of the first mode correspond to the severe flood and drought events in 1998 and 2006, respectively, indicating that their time coefficients reflect the typical events well. The tri-pole sea surface temperature anomaly in the North Atlantic, along with the sea ice anomaly near the Barents Sea, induces a quasi-zonal wave train in the upper troposphere. This wave train propagates from the tropical and mid-latitude Atlantic, traverses the mid-high latitudes of Eurasia, and reaches the eastern part of China. The wave train induces cyclonic (anticyclonic) anomalies in the north (south) of the ESWC, facilitating the convergence of high-latitude dry and cold air with warm and moist southwesterly winds from the tropical ocean. This convergence promotes increased summer precipitation in the ESWC. We provided valuable insights into the interannual variability of summer precipitation in the ESWC, shedding light on the physical mechanisms responsible for these variations. |
format |
Text |
author |
Chuhan Lu Dingan Huang Bo Chen Yingying Bai |
author_facet |
Chuhan Lu Dingan Huang Bo Chen Yingying Bai |
author_sort |
Chuhan Lu |
title |
Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China |
title_short |
Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China |
title_full |
Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China |
title_fullStr |
Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China |
title_full_unstemmed |
Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China |
title_sort |
causes of the interannual variation of summer precipitation in eastern southwest china |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2023 |
url |
https://doi.org/10.3390/atmos14081230 |
op_coverage |
agris |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea North Atlantic Sea ice |
genre_facet |
Barents Sea North Atlantic Sea ice |
op_source |
Atmosphere; Volume 14; Issue 8; Pages: 1230 |
op_relation |
Climatology https://dx.doi.org/10.3390/atmos14081230 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos14081230 |
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Atmosphere |
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14 |
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8 |
container_start_page |
1230 |
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1774716056763367424 |