Evaluating the Bias of South China Sea Summer Monsoon Precipitation Associated with Fast Physical Processes Using a Climate Model Hindcast Approach
Abstract
Abstract The present study aims to identify the precipitation bias associated with the interactions among fast physical processes in the Community Atmospheric Model, version 5 (CAM5), during the abrupt onset of the South China Sea (SCS) summer monsoon, a key precursor of the overall East Asia summer monsoon (EASM). The multiyear hindcast approach is utilized to obtain the well-constrained synoptic-scale horizontal circulation each year during the onset period from the years 1998 to 2012. In the pre-onset period, the ocean precipitation over the SCS is insufficiently suppressed in CAM5 hindcasts and thus weaker land–ocean precipitation contrasts. This is associated with the weaker and shallower convection simulated over the surrounding land, producing weaker local circulation within the SCS basin. In the post-onset period, rainfall of the organized convection over the Philippine coastal ocean is underestimated in the hindcasts, with overestimated upper-level heating. These biases are further elaborated as the underrepresentation of the convection diurnal cycle and coastal convection systems, as well as the issue of precipitation sensitivity to environmental moisture during the SCS onset period. The biases identified in hindcasts are consistent with the general bias of the EASM in the climate simulation of CAM5. The current results highlight that themore »
- Authors:
-
[1];
- Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan
- Lawrence Livermore National Laboratory, Livermore, California
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1529424
- Alternate Identifier(s):
- OSTI ID: 1557079
- Report Number(s):
- LLNL-JRNL-772998
Journal ID: ISSN 0894-8755
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Published Article
- Journal Name:
- Journal of Climate
- Additional Journal Information:
- Journal Name: Journal of Climate Journal Volume: 32 Journal Issue: 14; Journal ID: ISSN 0894-8755
- Publisher:
- American Meteorological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Monsoons; Precipitation; Climate models; Convective parameterization; Model evaluation/performance
Citation Formats
Chen, Wei-Ting, Wu, Chien-Ming, and Ma, Hsi-Yen. Evaluating the Bias of South China Sea Summer Monsoon Precipitation Associated with Fast Physical Processes Using a Climate Model Hindcast Approach. United States: N. p., 2019.
Web. doi:10.1175/JCLI-D-18-0660.1.
Chen, Wei-Ting, Wu, Chien-Ming, & Ma, Hsi-Yen. Evaluating the Bias of South China Sea Summer Monsoon Precipitation Associated with Fast Physical Processes Using a Climate Model Hindcast Approach. United States. https://doi.org/10.1175/JCLI-D-18-0660.1
Chen, Wei-Ting, Wu, Chien-Ming, and Ma, Hsi-Yen. Tue .
"Evaluating the Bias of South China Sea Summer Monsoon Precipitation Associated with Fast Physical Processes Using a Climate Model Hindcast Approach". United States. https://doi.org/10.1175/JCLI-D-18-0660.1.
@article{osti_1529424,
title = {Evaluating the Bias of South China Sea Summer Monsoon Precipitation Associated with Fast Physical Processes Using a Climate Model Hindcast Approach},
author = {Chen, Wei-Ting and Wu, Chien-Ming and Ma, Hsi-Yen},
abstractNote = {Abstract The present study aims to identify the precipitation bias associated with the interactions among fast physical processes in the Community Atmospheric Model, version 5 (CAM5), during the abrupt onset of the South China Sea (SCS) summer monsoon, a key precursor of the overall East Asia summer monsoon (EASM). The multiyear hindcast approach is utilized to obtain the well-constrained synoptic-scale horizontal circulation each year during the onset period from the years 1998 to 2012. In the pre-onset period, the ocean precipitation over the SCS is insufficiently suppressed in CAM5 hindcasts and thus weaker land–ocean precipitation contrasts. This is associated with the weaker and shallower convection simulated over the surrounding land, producing weaker local circulation within the SCS basin. In the post-onset period, rainfall of the organized convection over the Philippine coastal ocean is underestimated in the hindcasts, with overestimated upper-level heating. These biases are further elaborated as the underrepresentation of the convection diurnal cycle and coastal convection systems, as well as the issue of precipitation sensitivity to environmental moisture during the SCS onset period. The biases identified in hindcasts are consistent with the general bias of the EASM in the climate simulation of CAM5. The current results highlight that the appropriate representation of land–ocean–convection interactions over coastal areas can potentially improve the simulation of seasonal transition over the monsoon regions.},
doi = {10.1175/JCLI-D-18-0660.1},
journal = {Journal of Climate},
number = 14,
volume = 32,
place = {United States},
year = {Tue Jun 25 00:00:00 EDT 2019},
month = {Tue Jun 25 00:00:00 EDT 2019}
}
https://doi.org/10.1175/JCLI-D-18-0660.1
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Figures / Tables:
Figure 1: (a) Monsoon intensity (shading) and the 850 hPa wind differences between summer and winter (vectors: m s-1) within the Asian monsoon domain (green line). Following Wang and Ding (2008), Wang et al., (2011), and Kim et al., (2011), the monsoon domain is defined as areas with annual rangemore »
Figures / Tables found in this record: