Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Changes in precipitation extremes over the source region of the Yellow River and its relationship with teleconnection patterns

Yuan, Feifei LU ; Liu, Jiahong ; Berndtsson, Ronny LU orcid ; Hao, Zhenchun ; Cao, Qing ; Wang, Huimin ; Du, Yiheng LU and An, Dong LU (2020) In Water 12(4).
Abstract

Precipitation extremes and their underlying causes are important processes to understand to plan appropriate adaptation measures. This paper presents an analysis of the spatiotemporal variability and trend of precipitation extremes in the important source region of the Yellow River and explores the connection to global teleconnection patterns and the 850-mb vector wind. Six indices for precipitation extremes were computed and analyzed for assessment of a changing regional climate. Results showed that these indices have a strong gradient from the northwest to the southeast part for the period 1961-2015, due to the great influence from the south-easterly summer monsoon flow. However, no statistically significant trends were found for the... (More)

Precipitation extremes and their underlying causes are important processes to understand to plan appropriate adaptation measures. This paper presents an analysis of the spatiotemporal variability and trend of precipitation extremes in the important source region of the Yellow River and explores the connection to global teleconnection patterns and the 850-mb vector wind. Six indices for precipitation extremes were computed and analyzed for assessment of a changing regional climate. Results showed that these indices have a strong gradient from the northwest to the southeast part for the period 1961-2015, due to the great influence from the south-easterly summer monsoon flow. However, no statistically significant trends were found for the defined indices at the majority of stations, and their spatial distribution are noticed by irregularly mixed positive and negative changes except for the maximum number of consecutive wet days (CWD). Singular value decomposition analysis revealed that the precipitation extreme indices-including annual total precipitation when daily precipitation >95th percentile (R95p), annual count of days with daily precipitation ≥10 mm (R10mm), annual maximum consecutive 5-day precipitation (R5d), total precipitation divided by the number of wet days (SDII), and CWD-are negatively related to the El Nino-Southern Oscillation (NINO 3.4) in the first mode, and the maximum number of consecutive dry days (CDD) is positively related to the Scandinavian pattern in the second mode at 0.05 significance level. The 850-mb vector wind analysis showed that the southwestern monsoon originating from the Indian Ocean brings sufficient moisture to this region. Furthermore, the anti-cyclone in the western part of the North Pacific plays a significant role in the transport of moisture to the source region of the Yellow River. The links between precipitation extremes and teleconnection patterns explored in this study are important for better prediction and preparedness of climatic extremes.

(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
Precipitation extremes, Teleconnection patterns, The source region of the Yellow River, Wind vector
in
Water
volume
12
issue
4
article number
978
publisher
MDPI AG
external identifiers
  • scopus:85086903715
ISSN
2073-4441
DOI
10.3390/W12040978
language
English
LU publication?
yes
id
f5a830c0-8cc6-4d62-9a54-5bbf5fc652cf
date added to LUP
2020-07-10 10:08:29
date last changed
2023-10-08 08:01:59
@article{f5a830c0-8cc6-4d62-9a54-5bbf5fc652cf,
  abstract     = {{<p>Precipitation extremes and their underlying causes are important processes to understand to plan appropriate adaptation measures. This paper presents an analysis of the spatiotemporal variability and trend of precipitation extremes in the important source region of the Yellow River and explores the connection to global teleconnection patterns and the 850-mb vector wind. Six indices for precipitation extremes were computed and analyzed for assessment of a changing regional climate. Results showed that these indices have a strong gradient from the northwest to the southeast part for the period 1961-2015, due to the great influence from the south-easterly summer monsoon flow. However, no statistically significant trends were found for the defined indices at the majority of stations, and their spatial distribution are noticed by irregularly mixed positive and negative changes except for the maximum number of consecutive wet days (CWD). Singular value decomposition analysis revealed that the precipitation extreme indices-including annual total precipitation when daily precipitation &gt;95th percentile (R95p), annual count of days with daily precipitation ≥10 mm (R10mm), annual maximum consecutive 5-day precipitation (R5d), total precipitation divided by the number of wet days (SDII), and CWD-are negatively related to the El Nino-Southern Oscillation (NINO 3.4) in the first mode, and the maximum number of consecutive dry days (CDD) is positively related to the Scandinavian pattern in the second mode at 0.05 significance level. The 850-mb vector wind analysis showed that the southwestern monsoon originating from the Indian Ocean brings sufficient moisture to this region. Furthermore, the anti-cyclone in the western part of the North Pacific plays a significant role in the transport of moisture to the source region of the Yellow River. The links between precipitation extremes and teleconnection patterns explored in this study are important for better prediction and preparedness of climatic extremes.</p>}},
  author       = {{Yuan, Feifei and Liu, Jiahong and Berndtsson, Ronny and Hao, Zhenchun and Cao, Qing and Wang, Huimin and Du, Yiheng and An, Dong}},
  issn         = {{2073-4441}},
  keywords     = {{Precipitation extremes; Teleconnection patterns; The source region of the Yellow River; Wind vector}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{MDPI AG}},
  series       = {{Water}},
  title        = {{Changes in precipitation extremes over the source region of the Yellow River and its relationship with teleconnection patterns}},
  url          = {{http://dx.doi.org/10.3390/W12040978}},
  doi          = {{10.3390/W12040978}},
  volume       = {{12}},
  year         = {{2020}},
}