Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4

Lui, Yuk Sing; Tam, Chi‐Yung; Au-Yeung, Yee Man

doi:10.1007/s00382-018-4517-4

Cited by 8 publications

(4 citation statements)

References 57 publications

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“…It is a hydrostatic model with a staggered Arakawa B-grid system, developed by the International Centre for Theoretical Physics (ICTP, Giorgi et al, 2012). RegCM4 and its previous versions have been extensively used for numerous climate studies for different regions in the world, including CORDEX (Giorgi et al, 2009;Gu et al, 2012;Oh et al, 2014;Lui, Tam, Au-Yeung, and Lau, 2019). Here the model was integrated at the horizontal resolution of 25 km × 25 km, with 18 sigma levels, over the region of 1 S to 40 N, 105-135 E (Figure 1).…”

Section: Model and Data Usedmentioning

confidence: 99%

“…Detailed configuration of RegCM4 is given in Table 1. In particular, the Emanuel scheme (Emanuel, 1991;Emanuel and Živkovi c-Rothman, 1999) is chosen as the cumulus convective scheme over the whole domain, based on the results of Li et al (2016) and Lui, Tam, Au-Yeung, and Lau (2019), which indicate that the scheme can produce the most reasonable precipitation at a variety of timescales over Southern China.…”

Section: Model and Data Usedmentioning

confidence: 99%

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Investigating future changes in precipitation interannual variability and extremes over southern China

Liu

Tam

Tong

et al. 2022

Intl Journal of Climatology

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The Regional Climate Model system version 4 (RegCM4) has been used to dynamically downscale outputs from four different general circulation models (GCM) participating in the Coupled Model Intercomparison Project Phase 5 (CMIP5) to the horizontal resolution of 25 km × 25 km, in order to study changes in the Southern China hydrological cycle according to the Representative Concentration Pathway (RCP) 8.5 between 2050‐to‐2099 and 1979‐to‐2003. Accompanying wetter boreal spring and summer, the interannual rainfall variability for these seasons is also enhanced. A novel moisture budget analysis shows that changes in mean background humidity (anomalous wind convergence) dominate the increase in the interannual variability in spring (summer). Extreme daily precipitation in these seasons (based on the 95th percentile) is projected to become more intense, roughly following the Clausius–Clapeyron (CC) relation for the aforementioned seasons. On the other hand, the annual number of maximum consecutive dry days (CDD) is found to increase by about 3 to 5 days over locations south of 32° N, where autumn mean rainfall rate is projected to reduce (although this might be subjected to models' ability in capturing tropical cyclone activities). Analyses of the GCM raw outputs indicate that strengthened northerlies over coastal East Asia, which is likely associated with the so‐called tropical expansion, are responsible for the drier autumn.

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Section: Model and Data Usedmentioning

confidence: 99%

Section: Model and Data Usedmentioning

confidence: 99%

Investigating future changes in precipitation interannual variability and extremes over southern China

Liu

Tam

Tong

et al. 2022

Intl Journal of Climatology

View full text Add to dashboard Cite

show abstract

“…It is a hydrostatic model with a staggered Arakawa B-grid system, developed by the International Centre for Theoretical Physics (ICTP, Giorgi et al, 2012). RegCM4 and its previous versions have been extensively used for numerous climate studies for different regions in the world, such as the Coordinated Regional Downscaling Experiment (CORDEX) (https://cordex.org/) (Giorgi et al, 2009;Gu et al, 2012;Oh et al, 2014;Lui et al, 2019a). Here the model was integrated at the horizontal resolution of 25 km × 25 km, with 18 sigma levels, over the region of 1°S -40°N, 105 -135°E (see Fig.…”

Section: Model Experiments and Data Usedmentioning

confidence: 99%

“…1. In particular, the Emmanuel scheme (Emanuel, 1991;Emanuel and Živković-Rothman, 1999) is chosen as the cumulus convective scheme over the whole domain, based on the results of Li et al (2016) and Lui et al (2019a), which indicate that the scheme can produce the most reasonable precipitation at a variety of timescales over Southern China.…”

Section: Model Experiments and Data Usedmentioning

confidence: 99%

Investigating future changes in Southern China precipitation characteristics based on dynamically downscaled CMIP5 climate projections

Liu¹,

Tam²,

Lee

2020

Preprint

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In this study, general circulation model (GCM) products were dynamically downscaled using the Regional Climate Model system version 4 (RegCM4), in order to study changes in the hydrological cycle - including extreme events - due to a warmer climate by the end of the 21st century over Southern China. The performance of 22 GCMs participating in the Coupled Model Intercomparison Project Phase 5 (CMIP5) in simulating the climate over the East Asian- western north Pacific region was first evaluated. It was found that MPI-ESM-MR, CNRM-CM5, ACCESS1-3, and GFDL- CM3 can reasonably reproduce the seasonal mean atmospheric circulation in that region, as well as its interannual variability. Outputs from these GCMs were subsequently downscaled, using the RegCM4, to a horizontal resolution of 25 km &#215; 25km, for the period of 1979 to 2003, and also from 2050 to 2099, with the latter based on GCM projection according to the RCP8.5 scenario. Results show that the whole domain would undergo warming at the lower troposphere by 3 &#8211; 4 &#176;C over inland China and ~2 &#176;C over the ocean and low-latitude locations. Compared to the 1979-2003 era, during 2050-2099 boreal summer, the mean precipitation is projected to increase by 1 &#8211; 2 mm/day over coastal Southern China. There is also significantly enhanced interannual variability for the same season. In boreal spring, a similar increase in both the seasonal mean and also its year-to-year variations is also found, over more inland locations at about 25&#176;N. Extreme daily precipitation is projected to become more intense, based on analyses of the 95th percentile for these seasons. On the other hand, it will be significantly drier during autumn over a broad area in Southern China: the mean rainfall is projected to decrease by ~1 mm/day. In addition, changes in the annual number of consecutive dry days (CDD) throughout the whole calendar year was also examined. It was found that CDD over the more inland locations will increase by ~5 days. Thus, there will be a lengthening of the dry season in the region. Global warming&#8217;s potential impact on sub-daily rainfall is also examined. For the rainfall diurnal cycle (DC), there is no significant change in both spatial and temporal patterns. Moisture budget analyses are also carried out, in order to ascertain the importance of change in background moisture, versus that in wind circulation, on the intensification of MAM and JJA mean rainfall as well as their interannual variability. The implication of these results on water management and climate change adaptation over the Southern China region will be discussed.

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Impact of Convective and Land Surface Parameterization Schemes on the Simulation of Surface Temperature and Precipitation Using RegCM4.7 During Summer Period Over the DPR Korea

Jo,

Kim,

Pak

et al. 2024

Pure Appl. Geophys.

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Role of cumulus parameterization on the seasonal and diurnal precipitation over Southeast Asia in RegCM4

Cited by 8 publications

References 57 publications

Investigating future changes in precipitation interannual variability and extremes over southern China

Investigating future changes in precipitation interannual variability and extremes over southern China

Investigating future changes in Southern China precipitation characteristics based on dynamically downscaled CMIP5 climate projections

Impact of Convective and Land Surface Parameterization Schemes on the Simulation of Surface Temperature and Precipitation Using RegCM4.7 During Summer Period Over the DPR Korea

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