skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Evaluating the Bias of South China Sea Summer Monsoon Precipitation Associated with Fast Physical Processes Using a Climate Model Hindcast Approach

Journal Article · · Journal of Climate
ORCiD logo [1];  [1];  [2]
  1. Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan
  2. Lawrence Livermore National Laboratory, Livermore, California
+ Show Author Affiliations

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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1529424
Alternate ID(s):
OSTI ID: 1557079
Report Number(s):
LLNL-JRNL-772998
Journal Information:
Journal of Climate, Journal Name: Journal of Climate Vol. 32 Journal Issue: 14; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

Figures / Tables (18)

Figure 1(p. 47)figure Figure 1
Figure 2(p. 48)figure Figure 2
Figure 3(p. 49)figure Figure 3
Figure 4(p. 50)figure Figure 4
Figure 5(p. 51)figure Figure 5
Figure 6(p. 52)figure Figure 6
Figure 7(p. 53)figure Figure 7
Figure 8(p. 54)figure Figure 8
Figure 9(p. 55)figure Figure 9
Figure 10(p. 56)figure Figure 10
Figure 11(p. 57)figure Figure 11
Figure 12(p. 58)figure Figure 12
Figure 13(p. 59)figure Figure 13
Figure S1(p. 63)figure Figure S1
Figure S2(p. 64)figure Figure S2
Fig. S3(p. 65)figure Fig. S3
Figure S4(p. 66)figure Figure S4
Figure S5(p. 67)figure Figure S5

Similar Records

Significant Land Contributions to Interannual Predictability of East Asian Summer Monsoon Rainfall
Journal Article · Wed Feb 03 00:00:00 EST 2021 · Earth's Future · OSTI ID:1529424
+11 more
Evaluation of a multi-scale WRF-CAM5 simulation during the 2010 East Asian Summer Monsoon
Journal Article · Wed Nov 01 00:00:00 EDT 2017 · Atmospheric Environment (1994) · OSTI ID:1529424
+5 more
Evaluation of a multi-scale WRF-CAM5 simulation during the 2010 East Asian Summer Monsoon
Journal Article · Fri Sep 08 00:00:00 EDT 2017 · Atmospheric Environment (1994) · OSTI ID:1529424
+5 more

Related Subjects

54 ENVIRONMENTAL SCIENCES
Monsoons
Precipitation
Climate models
Convective parameterization
Model evaluation/performance