Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Integrated large‐scale circulation impact on rainy season precipitation in the source region of the Yangtze River

du, Yiheng LU ; Berndtsson, Ronny LU orcid ; An, Dong LU ; Zhang, Linus Tielin LU orcid ; Yuan, Feifei LU and Hao, Zhenchun (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:
author
; ; ; ; and
organization
publishing date
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}},
}