Revisiting the physical mechanisms of East Asian summer monsoon precipitation changes during the mid-Holocene: a data–model comparison - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Climate Dynamics Année : 2023

Revisiting the physical mechanisms of East Asian summer monsoon precipitation changes during the mid-Holocene: a data–model comparison

Yong Sun
Haibin Wu
  • Fonction : Auteur
Bo Liu
  • Fonction : Auteur
Yan Zhao
  • Fonction : Auteur
Laurent Li
Xiayu Yuan
  • Fonction : Auteur
Wenchao Zhang
  • Fonction : Auteur
Lijuan Li
  • Fonction : Auteur
Liwei Zou
  • Fonction : Auteur
Tianjun Zhou
  • Fonction : Auteur

Résumé

Abstract The mid-Holocene (MH; 6 ka) is one of the benchmark periods for the Paleoclimate Modeling Intercomparison Project (PMIP) and provides a unique opportunity to study monsoon dynamics and orbital forcing (i.e., mostly precession) that differ significantly from the present day. We conducted a data–model comparison along with a dynamic analysis to investigate monsoonal (i.e., East Asian summer monsoon; EASM) precipitation changes over East Asia during the MH. We used the three phases of the PMIP simulations for the MH, and quantitatively compare model results with pollen-based climate records. The data–model comparison shows an overall increase in the summer monsoon precipitation, except a local decrease during the MH. Decomposition of the moisture budget into thermodynamic and dynamic components allows us to assess their relative role in controlling EASM precipitation during the MH, and to investigate the precipitation changes obtained from pollen records in terms of physical processes. We show that the dynamic effect, rather than the thermodynamic effect, is the dominant control in increased EASM precipitation during the MH in both the proxy records and models. The dynamic increase in precipitation results mainly from the enhancement of horizontal monsoonal moisture transport that is caused by intensified stationary eddy horizontal circulation over East Asia. In addition, a cloud-related cooling effect reduced the thermodynamic contribution to the increase in EASM precipitation during the MH.
Fichier principal
Vignette du fichier
Sun2022_Article_RevisitingThePhysicalMechanism.pdf (2.79 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03704566 , version 1 (01-07-2022)

Licence

Paternité

Identifiants

Citer

Yong Sun, Haibin Wu, Gilles Ramstein, Bo Liu, Yan Zhao, et al.. Revisiting the physical mechanisms of East Asian summer monsoon precipitation changes during the mid-Holocene: a data–model comparison. Climate Dynamics, 2023, 60, pp.1009-1022. ⟨10.1007/s00382-022-06359-1⟩. ⟨hal-03704566⟩
76 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More