Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-125
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
16 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).
Timescale-dependence of the relationship between the East Asian summer monsoon strength and precipitation over eastern China in the last millennium
Jian Shi1, Qing Yan2,3, and Huijun Wang2,3 1College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China
2Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
3Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, 210044, China
Abstract. Precipitation/humidity proxies are widely used to reconstruct the historical East Asian summer monsoon (EASM) variation based on the assumption that summer precipitation over eastern China is closely and stably linked to the strength of EASM. However, whether the observed EASM-precipitation relationship (e.g., increased precipitation with a stronger EASM) was stable throughout the past time remains unclear. In this study, we used model outputs from the Paleoclimate Modelling Intercomparison Project Phase Ⅲ and Community Earth System Model to investigate the stability of the EASM-precipitation relationship over the last millennium on different timescales. The model results indicate that the EASM strength (defined as the regionally averaged meridional wind) enhanced in the Medieval Climate Anomaly (MCA; ~ 950–1250 A.D.), during which there was increased precipitation over eastern China, and weakened during the Little Ice Age (LIA; ~ 1500‒1800 A.D.), during which there was decreased precipitation, consistent with precipitation/humidity proxies. However, the simulated EASM-precipitation relationship is only stable on a centennial and longer timescale and is unstable on a multi-decadal timescale. The nonstationary multi-decadal EASM-precipitation relationship broadly exhibits a quasi-60-year period, which may be attributed to the internal variability of the climate system and have no significant correlation to external forcings. Our results have implications for understanding the discrepancy among various EASM proxies on a multi-decadal timescale and highlight the need to rethink reconstructed decadal EASM variations based on precipitation/humidity proxies.

Citation: Shi, J., Yan, Q., and Wang, H.: Timescale-dependence of the relationship between the East Asian summer monsoon strength and precipitation over eastern China in the last millennium, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-125, in review, 2017.
Jian Shi et al.
Jian Shi et al.

Viewed

Total article views: 200 (including HTML, PDF, and XML)

HTML PDF XML Total Supplement BibTeX EndNote
151 44 5 200 8 2 0

Views and downloads (calculated since 16 Oct 2017)

Cumulative views and downloads (calculated since 16 Oct 2017)

Viewed (geographical distribution)

Total article views: 200 (including HTML, PDF, and XML)

Thereof 200 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 18 Nov 2017
Publications Copernicus
Download
Short summary
The paleo-East Asian summer monsoon (EASM) is widely reconstructed by precipitation/humidity proxies. However, based on numerical simulations over the last millennium, we find that the multi-decadal relationship between the EASM and precipitation (EASM-precipitation relationship) is non-stationary, which may be attributed to the internal variability of the climate system rather than the external forcings. In contrast, the centennial EASM-precipitation relationship is more closely and stable.
The paleo-East Asian summer monsoon (EASM) is widely reconstructed by precipitation/humidity...
Share