Integrated large‐scale circulation impact on rainy season precipitation in the source region of the Yangtze River
(2020) In International Journal of Climatology 40(4). p.2285-2295- Abstract
- Monthly precipitation data at regular grids of 0.5° × 0.5° derived from observations during June–August 1961–2016 were used to reveal characteristics of large‐scale circulations associated with rainy season precipitation over the source region of the Yangtze River (SRYR). The integrated impact of major influencing circulation patterns was examined by principal component analysis and composites. Results showed that the first rainy season precipitation mode associates with the Southern Oscillation Index (SOI) and the Pacific Decadal Oscillation (PDO), explaining 64% of spatial and temporal rainy season precipitation variance in the region. Composites of precipitation pattern under different phases of SOI and PDO revealed that the effect of... (More)
- Monthly precipitation data at regular grids of 0.5° × 0.5° derived from observations during June–August 1961–2016 were used to reveal characteristics of large‐scale circulations associated with rainy season precipitation over the source region of the Yangtze River (SRYR). The integrated impact of major influencing circulation patterns was examined by principal component analysis and composites. Results showed that the first rainy season precipitation mode associates with the Southern Oscillation Index (SOI) and the Pacific Decadal Oscillation (PDO), explaining 64% of spatial and temporal rainy season precipitation variance in the region. Composites of precipitation pattern under different phases of SOI and PDO revealed that the effect of PDO on precipitation varies with the SOI phase. When out of phase with the SOI, PDO‐induced precipitation anomalies are magnified. When they are in phase, anomalies weaken or even disappear. Composites of moisture flux patterns show that large‐scale atmospheric circulation affects the strength of westerlies that transport moisture to the study area and formation of convergence. In coming decades, the PDO is likely to continue in a negative phase with La Niña (positive SOI) events, implying more precipitation during the rainy season. Consequently, this knowledge can be used to improve decision making regarding water supply and flood risk management in the SRYR. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/ed4fce67-605f-4b01-be88-7f6f103cf9d9
- author
- du, Yiheng LU ; Berndtsson, Ronny LU ; An, Dong LU ; Zhang, Linus Tielin LU ; Yuan, Feifei LU and Hao, Zhenchun
- organization
- publishing date
- 2020-03-30
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- moisture flux, SRYR, PDO, precipitation, SOI
- in
- International Journal of Climatology
- volume
- 40
- issue
- 4
- article number
- joc.6332
- pages
- 11 pages
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:85074036428
- ISSN
- 1097-0088
- DOI
- 10.1002/joc.6332
- project
- Present and future precipitation variations in the source region of the Yangtze River, China
- language
- English
- LU publication?
- yes
- id
- ed4fce67-605f-4b01-be88-7f6f103cf9d9
- date added to LUP
- 2019-11-04 10:29:39
- date last changed
- 2023-09-23 16:52:52
@article{ed4fce67-605f-4b01-be88-7f6f103cf9d9, abstract = {{Monthly precipitation data at regular grids of 0.5° × 0.5° derived from observations during June–August 1961–2016 were used to reveal characteristics of large‐scale circulations associated with rainy season precipitation over the source region of the Yangtze River (SRYR). The integrated impact of major influencing circulation patterns was examined by principal component analysis and composites. Results showed that the first rainy season precipitation mode associates with the Southern Oscillation Index (SOI) and the Pacific Decadal Oscillation (PDO), explaining 64% of spatial and temporal rainy season precipitation variance in the region. Composites of precipitation pattern under different phases of SOI and PDO revealed that the effect of PDO on precipitation varies with the SOI phase. When out of phase with the SOI, PDO‐induced precipitation anomalies are magnified. When they are in phase, anomalies weaken or even disappear. Composites of moisture flux patterns show that large‐scale atmospheric circulation affects the strength of westerlies that transport moisture to the study area and formation of convergence. In coming decades, the PDO is likely to continue in a negative phase with La Niña (positive SOI) events, implying more precipitation during the rainy season. Consequently, this knowledge can be used to improve decision making regarding water supply and flood risk management in the SRYR.}}, author = {{du, Yiheng and Berndtsson, Ronny and An, Dong and Zhang, Linus Tielin and Yuan, Feifei and Hao, Zhenchun}}, issn = {{1097-0088}}, keywords = {{moisture flux; SRYR; PDO; precipitation; SOI}}, language = {{eng}}, month = {{03}}, number = {{4}}, pages = {{2285--2295}}, publisher = {{John Wiley & Sons Inc.}}, series = {{International Journal of Climatology}}, title = {{Integrated large‐scale circulation impact on rainy season precipitation in the source region of the Yangtze River}}, url = {{http://dx.doi.org/10.1002/joc.6332}}, doi = {{10.1002/joc.6332}}, volume = {{40}}, year = {{2020}}, }