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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Online Access: | https://doi.org/10.3390/atmos14081230 https://doaj.org/article/a72dced979c14cc7a7f658d23bf86739 |
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ftdoajarticles:oai:doaj.org/article:a72dced979c14cc7a7f658d23bf86739 2023-09-26T15:16:32+02:00 Causes of the Interannual Variation of Summer Precipitation in Eastern Southwest China Chuhan Lu Dingan Huang Bo Chen Yingying Bai 2023-07-01T00:00:00Z https://doi.org/10.3390/atmos14081230 https://doaj.org/article/a72dced979c14cc7a7f658d23bf86739 EN eng MDPI AG https://www.mdpi.com/2073-4433/14/8/1230 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14081230 2073-4433 https://doaj.org/article/a72dced979c14cc7a7f658d23bf86739 Atmosphere, Vol 14, Iss 1230, p 1230 (2023) eastern southwest China interannual causes of precipitation change sea surface temperature anomaly Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.3390/atmos14081230 2023-08-27T00:36:09Z 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. Article in Journal/Newspaper Barents Sea North Atlantic Sea ice Directory of Open Access Journals: DOAJ Articles Barents Sea Atmosphere 14 8 1230 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
eastern southwest China interannual causes of precipitation change sea surface temperature anomaly Meteorology. Climatology QC851-999 |
spellingShingle |
eastern southwest China interannual causes of precipitation change sea surface temperature anomaly Meteorology. Climatology QC851-999 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 Meteorology. Climatology QC851-999 |
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 |
Article in Journal/Newspaper |
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 |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/atmos14081230 https://doaj.org/article/a72dced979c14cc7a7f658d23bf86739 |
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, Vol 14, Iss 1230, p 1230 (2023) |
op_relation |
https://www.mdpi.com/2073-4433/14/8/1230 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14081230 2073-4433 https://doaj.org/article/a72dced979c14cc7a7f658d23bf86739 |
op_doi |
https://doi.org/10.3390/atmos14081230 |
container_title |
Atmosphere |
container_volume |
14 |
container_issue |
8 |
container_start_page |
1230 |
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1778137731074883584 |