Cristin-resultat-ID: 1494196
Sist endret: 22. februar 2018, 11:36
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

Asian droughts in the last millennium: a search for robust impacts of Pacific Ocean surface temperature variabilities

Bidragsytere:
  • Entao Yu
  • Martin Peter King
  • Stefan Pieter Sobolowski
  • Odd Helge Otterå og
  • Yongqi Gao

Tidsskrift

Climate Dynamics
ISSN 0930-7575
e-ISSN 1432-0894
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Publisert online: 2017
Volum: Published ahead of print
Sider: 1 - 19

Importkilder

Scopus-ID: 2-s2.0-85029457559

Beskrivelse Beskrivelse

Tittel

Asian droughts in the last millennium: a search for robust impacts of Pacific Ocean surface temperature variabilities

Sammendrag

This study investigates the robustness of hydroclimate impacts in Asia due to major drivers of climate variability in the Pacific Ocean, namely the El Niño-Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO). Composite analyses are carried out on a tree ring-based Palmer Drought Severity Index as well as on a long coupled global climate model control experiment. El Niño (La Niña) has a robust impact on wet (dry) conditions in West Asia and dry (wet) conditions in South Asia. For the PDO, impacts are found throughout the Asia domain. However, identifying the robust signals due to PDO from these analyses is more challenging due to the limited lengths of the data. Results indicate that West Asia (South and Southeast Asia) experiences wet (dry) conditions during periods of positive PDO. For East Asia, there is indication that positive (negative) PDO is associated with wet (dry) conditions around and southward of 30°N and dry (wet) conditions north of this latitude. This result is consistent with the current understanding of the role of PDO in the “southern-flood northern-drought” phenomenon in China. We suggest that specific extreme events or periods have regional impacts with strong intensities that cannot be fully explained through the composite analysis of ENSO, PDO, or any combination thereof. Two such examples are shown to illustrate this: the Strange Parallel Drought (1756–1768 CE) and the Great Drought (1876–1878 CE). Additionally, during these climate events, ENSO and PDO can be in phases which are not consistent with the required phases of these drivers that explain the concurrent drought and pluvial conditions in Asia. Therefore, not all historical drought and pluvial events in Northeast Asia and northern China can be related back to ENSO or PDO. Finally, we also examine the dynamical characteristics of the reported hydroclimatic impacts in the global climate model experiment. There is moisture transport into (out of) regions that exhibit wet (dry) conditions in a manner consistent with the various ENSO and PDO composites, thereby providing physical explanation of the index-based results.

Bidragsytere

Entao Yu

  • Tilknyttet:
    Forfatter
    ved Nansen-Zhu International Research Center
  • Tilknyttet:
    Forfatter
    ved Nanjing University of Technology

Martin King

Bidragsyterens navn vises på dette resultatet som Martin Peter King
  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS

Stefan Pieter Sobolowski

  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS

Odd Helge Otterå

  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS

Yongqi Gao

  • Tilknyttet:
    Forfatter
    ved Nansen Senter for Miljø og Fjernmåling
  • Tilknyttet:
    Forfatter
    ved Nansen-Zhu International Research Center
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