scholarly journals Comparison of Tropical Cyclone Activities over the Western North Pacific in CORDEX-East Asia Phase I and II Experiments

2020 ◽  
Vol 33 (24) ◽  
pp. 10593-10607
Author(s):  
Minkyu Lee ◽  
Dong-Hyun Cha ◽  
Myoung-Seok Suh ◽  
Eun-Chul Chang ◽  
Joong-Bae Ahn ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Regional Climate ◽  
Horizontal Resolution ◽  
Added Value ◽  
Convective Precipitation ◽  
Coastal Regions ◽  
Cordex East Asia

AbstractThis study evaluated tropical cyclone (TC) activity simulated by two regional climate models (RCMs) incorporated in the Coordinated Regional Climate Downscaling Experiment (CORDEX) framework with two different horizontal resolutions. Evaluation experiments with two RCMs (RegCM4 and MM5) forced by reanalysis data were conducted over the CORDEX-East Asia domain for phases I and II. The main difference between phases I and II is horizontal resolution (50 and 25 km). The 20-yr (1989–2008) mean performances of the experiments were investigated in terms of TC genesis, track, intensity, and TC-induced precipitation. In general, the simulated TC activities over the western North Pacific (WNP) varied depending on the model type and horizontal resolution. For both models, higher horizontal resolution improved the simulation of TC tracks near the coastal regions of East Asia, whereas the coarser horizontal resolution led to underestimated TC genesis compared with the best track data because of greater convective precipitation and enhanced atmospheric stabilization. In addition, the increased horizontal resolution prominently improved the simulation of TCs landfalling in East Asia and associated precipitation around coastal regions. This finding implies that high-resolution RCMs can improve the simulation of TC activities over the WNP (i.e., added value by increasing model resolution); thus, they have an advantage in climate change assessment studies.

Impact of horizontal resolution on the tropical cyclone activity over the western North Pacific in CORDEX-East Asia phase I and II experiments

2020 ◽  
Author(s):  
Dong-Hyun Cha ◽  
Minkyu Lee ◽  
Myoung-Seok Suh ◽  
Eun-Chul Chang ◽  
Joong-Bae Ahn ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Regional Climate ◽  
Horizontal Resolution ◽  
Added Value ◽  
Convective Precipitation ◽  
Coastal Regions ◽  
Cordex East Asia

<p> This study evaluated tropical cyclone (TC) activity simulated by two regional climate models (RCMs) incorporated in the Coordinated Regional Climate Downscaling Experiment (CORDEX) framework with two different horizontal resolutions. Evaluation experiments with two RCMs (RegCM4 and MM5) forced by reanalysis data were conducted over the CORDEX-East Asia domain with 25 km and 50 km horizontal resolutions. The 20-year (1989<strong>–</strong>2008) mean performances of the experiments were investigated in terms of TC genesis, track, intensity, and TC-induced precipitation. In general, the simulated TC activities over the western North Pacific (WNP) varied depending on the model type and horizontal resolution. The MM5 tended to simulate more reasonable TC activity compared with the RegCM4. For both models, higher horizontal resolution improved the simulation of TC tracks near the coastal regions of East Asia, whereas the coarse horizontal resolution led to underestimated TC genesis compared with the best track data because of greater convective precipitation and enhanced atmospheric stabilization. In addition, the increased horizontal resolution prominently improved the simulation of TCs landfalling in East Asia and associated precipitation around coastal regions. This finding implies that high-resolution RCMs can produce added value in improving the simulation of TCs over the WNP; thus, they have an advantage in climate change assessment studies.</p>

scholarly journals Future Change in Tropical Cyclone Activity over the Western North Pacific in CORDEX-East Asia Multi-RCMs Forced by HadGEM2-AO

2019 ◽  
Vol 32 (16) ◽  
pp. 5053-5067 ◽  
Author(s):  
Hyeonjae Lee ◽  
Chun-Sil Jin ◽  
Dong-Hyun Cha ◽  
Minkyu Lee ◽  
Dong-Kyou Lee ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Climate Models ◽  
Regional Climate ◽  
Vertical Wind Shear ◽  
Coastal Regions ◽  
The Future ◽  
Cordex East Asia

AbstractFuture changes in tropical cyclone (TC) activity over the western North Pacific (WNP) are analyzed using four regional climate models (RCMs) within the Coordinated Regional Climate Downscaling Experiment (CORDEX) for East Asia. All RCMs are forced by the HadGEM2-AO under the historical and representative concentration pathway (RCP) 8.5 scenarios, and are performed at about 50-km resolution over the CORDEX-East Asia domain. In the historical simulations (1980–2005), multi-RCM ensembles yield realistic climatology for TC tracks and genesis frequency during the TC season (June–November), although they show somewhat systematic biases in simulating TC activity. The future (2024–49) projections indicate an insignificant increase in the total number of TC genesis (+5%), but a significant increase in track density over East Asia coastal regions (+17%). The enhanced TC activity over the East Asia coastal regions is mainly related to vertical wind shear weakened by reduced meridional temperature gradient and increased sea surface temperature (SST) at midlatitudes. The future accumulated cyclone energy (ACE) of total TCs increases significantly (+19%) because individual TCs have a longer lifetime (+6.6%) and stronger maximum wind speed (+4.1%) compared to those in the historical run. In particular, the ACE of TCs passing through 25°N increases by 45.9% in the future climate, indicating that the destructiveness of TCs can be significantly enhanced in the midlatitudes despite the total number of TCs not changing greatly.

Evaluation of climatological tropical cyclone activity over the western North Pacific in the CORDEX-East Asia multi-RCM simulations

2015 ◽  
Vol 47 (3-4) ◽  
pp. 765-778 ◽  
Author(s):  
Chun-Sil Jin ◽  
Dong-Hyun Cha ◽  
Dong-Kyou Lee ◽  
Myoung-Seok Suh ◽  
Song-You Hong ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Tropical Cyclone Activity ◽  
Cyclone Activity ◽  
Cordex East Asia

scholarly journals Implications of the Observed Relationship between Tropical Cyclone Size and Intensity over the Western North Pacific

2015 ◽  
Vol 28 (24) ◽  
pp. 9501-9506 ◽  
Author(s):  
Liguang Wu ◽  
Wei Tian ◽  
Qingyuan Liu ◽  
Jian Cao ◽  
John A. Knaff
Keyword(s):  
Numerical Simulation ◽  
Tropical Cyclone ◽  
Numerical Simulations ◽  
North Pacific ◽  
Western North Pacific ◽  
Horizontal Resolution ◽  
Wind Damage ◽  
Nonlinear Relationship ◽  
Rainfall Distribution ◽  
The Relationship

Abstract Tropical cyclone (TC) size, usually measured with the radius of gale force wind (34 kt or 17 m s−1), is an important parameter for estimating TC risks such as wind damage, rainfall distribution, and storm surge. Previous studies have reported that there is a very weak relationship between TC size and TC intensity. A close examination presented here using satellite-based wind analyses suggests that the relationship between TC size and intensity is nonlinear. TC size generally increases with increasing TC maximum sustained wind before a maximum of 2.50° latitude at an intensity of 103 kt or 53.0 m s−1 and then slowly decreases as the TC intensity further increases. The observed relationship between TC size and intensity is compared to the relationships produced by an 11-yr seasonal numerical simulation of TC activity. The numerical simulations were able to produce neither the observed maximum sustained winds nor the observed nonlinear relationship between TC size and intensity. This finding suggests that TC size cannot reasonably be simulated with 9-km horizontal resolution and increased resolution is needed to study TC size variations using numerical simulations.

scholarly journals The dominant role of East Asia warming in increasing tropical western North Pacific tropical cyclone intensity

2021 ◽  
Author(s):  
Ping Zhao ◽  
Jing Xu ◽  
Johnny Chan ◽  
Ming Shi ◽  
Chi Yang ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Wave Train ◽  
East Asian ◽  
Vertical Wind Shear ◽  
South Asian High ◽  
Asian Continent ◽  
Increasing Trend

Abstract The increase in intense tropical cyclone (TC) activity over the western North Pacific (WNP) has often been linked to a warming ocean1-8. Here we show, however, that the TC intensity increasing trend in the tropical WNP during the past three decades are mainly related to the warming of the East Asian continent, especially a warming Tibetan Plateau (TP). The regional weak increasing trend of local sea surface temperature unlikely supplies the necessary energy for this increase in TC intensity. Instead, a weakened vertical wind shear (VWS) appears to be the main contributing factor. Through numerical simulations, we demonstrate that the warming TP strengthens the South Asian high-pressure system, which triggers a wave train toward the tropical WNP, subsequently modifying the upper- and lower-tropospheric zonal winds to reduce the VWS. Applying the high correlation between TC intensity and the local VWS to climate model projection results supports that TCs will likely become stronger, with a significantly increasing rate of 1.0 m s-1/10 years during 2021–2050, due to a further warming of the East Asian continent. Thus, the rims of East Asia and Southeast Asia could face an increasing risk of intense typhoons.

Added Value of reproduced precipitation by high resolved regional climate model simulation over CORDEX-East Asia

2020 ◽  
Author(s):  
Taehyung Kim ◽  
Dong-Hyun Cha ◽  
Gayoung Kim ◽  
Seok-Woo Shin ◽  
Changyong Park ◽  
...  
Keyword(s):  
East Asia ◽  
Extreme Precipitation ◽  
Climate Models ◽  
Phase 1 ◽  
Regional Climate ◽  
Regional Climate Models ◽  
Added Value ◽  
Phase 2 ◽  
Fine Resolution ◽  
Cordex East Asia

<p>In the framework of the CORDEX-East Asia, evaluation simulations using high-resolution regional climate models (SNURCM and HadGEM3-RA) with ~25km (Phase2) grid scale have been conducted. In this study, we investigate whether the higher-resolution regional climate models (RCMs) can generate added values for summer mean precipitation, large-scale circulation, and extreme precipitation compared to those with lower-resolution (~50km, Phase 1). In addition, the added value index is used to quantitatively analyze the abilities of fine- and coarse-resolution RCMs. Hence, sets of phase 1 and phase 2 simulations of two RCMs are compared to observations in the East Asia region. In SNURCM simulations, positive (negative) added value of summer mean precipitation is reproduced over most ocean (land) region of East Asia in fine-resolution simulation. Extreme precipitation over Korea and Japan is well reproduced in Phase 2 simulations because the simulations of typhoons and East Asia summer monsoon are improved. In HadGEM3-RA simulations, the results of summer mean precipitation over most East Asian regions above 25°N are improved in Phase 2, while worse results are reproduced below 25°N. But, extreme precipitation in fine-resolution simulation is adequately reproduced in most regions of East Asia except China and the Yellow sea. As a result, the results of the simulations are different depending on the characteristics of the individual models, but more positive added values for the intensity and spatial distribution of precipitation over East Asia are generated as the horizontal resolution of RCMs increases.</p><p>This work was funded by the Korea Meteorological Administration Research and Development Program under Grant KMI(KMI2018-01211)</p><p> </p>

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