Dynamic risk assessment of waterlogging disaster for maize based on CERES-Maize model in Midwest of Jilin Province,China   总被引：1，自引：0，他引：1  

Enliang Guo  Jiquan Zhang  Yongfang Wang  Ha Si  Feng Zhang 《Natural Hazards》2016,83(3):1747-1761

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The seasonally varying effect of the Tibetan Plateau on Northern Hemispheric blocking frequency and amplitude     

Kyung-Sook Yun  Ye-Won Seo  Kyung-Ja Ha  June-Yi Lee  Akio Kitoh 《Climate Dynamics》2016,47(7-8):2527-2541

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Use of mixed bivariate distributions for deriving inter‐station correlation coefficients of rain rate     

Eunho Ha  Chulsang Yoo 《水文研究》2007,21(22):3078-3086

Even though rain rate is notorious for its spatial and temporal intermittency, its effect on the second‐order statistics of rain rate, especially the inter‐station correlation coefficients, has not been intensively evaluated before. This study has derived and compared the inter‐station correlation coefficient of rain rate for three cases of data: (1) only the positive measurements at both locations; (2) the positive measurements at either one or both locations; (3) all the measurements including zero measurement at both locations. For these three cases, the inter‐station correlation coefficients are analytically derived by applying the mixed bivariate log‐normal distribution. As an application example, the model parameters are estimated using the rain rate data collected at the Geum River basin, Korea, and the resulting inter‐station correlation coefficients are evaluated and compared with those estimated by applying the Gaussian distribution. We could find that highly biased inter‐station correlation coefficients are unavoidable when simply estimating them under the assumption of Gaussian distribution, or even when using the log‐transformed rain rate data. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Thermodynamic characteristics and responses to ENSO of dominant intraseasonal modes in the East Asian summer monsoon     

Hyoeun Oh  Kyung-Ja Ha 《Climate Dynamics》2015,44(7-8):1751-1766

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Two leading modes of Northern Hemisphere blocking variability in the boreal wintertime and their relationship with teleconnection patterns     

Seon-Hwa Kim  Kyung-Ja Ha 《Climate Dynamics》2015,44(9-10):2479-2491

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Novel integrated approaches for predicting the compressibility of clay using cascade forward neural networks optimized by swarm- and evolution-based algorithms     

He  Ziguang  Nguyen  Hoang  Vu  Thai Ha  Zhou  Jian  Asteris  Panagiotis G.  Mammou  Anna 《Acta Geotechnica》2022,17(4):1257-1272

Acta Geotechnica - Soft soils are considered as disadvantages in construction, especially in clay layers. It requires many advanced techniques to treat the soft soils before construction, aiming to...  相似文献   

Under-ice measurements of suspended particulate matters using ADCP and LISST-Holo     

Ha  Ho Kyung  Kim  Yong Hoon  Lee  Hyun Jung  Hwang  Byongjun  Joo  Hyoung Min 《Ocean Science Journal》2015,50(1):97-108

Ocean Science Journal - Using a mooring package comprising an acoustic Doppler current profiler (ADCP) and holographic imaging system, a 1-day ice camp study was performed under the Arctic sea ice...  相似文献   

Simulation of snowstorm over the Yellow Sea using a mesoscale coupled model     

Ki-Young Heo  Kyung-Eak Kim  Kyung-Ja Ha  Kwang-Soon Park  Ki-Cheon Jun  Jae-Seol Shim  Young-Sang Suh 《Asia-Pacific Journal of Atmospheric Sciences》2010,46(4):437-452

This study aims to examine the favorable conditions for an ocean effect snowstorm across the Yellow Sea over the southwestern coast of Korea on 21 December 2005, using a coupled model with a Coupled Ocean/Atmosphere Mesoscale Prediction System as the atmospheric component and the Regional Ocean Modeling System as the oceanic component. Simulation of heavy snowfall event, which was 44.3 cm of snow accumulated in 24-hour, was performed to investigate the mesoscale structure, dynamics and development mechanisms in the snowstorm. As a result from 48-hour integration, the results of simulation showed that barotropic instability and turbulent heat fluxes played important roles in the formation of snowstorm. The enhanced surface diabatic heating was dominant in the latent heat flux, and eventually induced convective instability. An additional factor was the favorable condition of synoptic environment, accessing the cold air transport by the approach of the upper-level cold vortex over the warm ocean. Besides these factors, conditional symmetric instability (CSI) is a mechanism which can result in a heavy snowfall with sufficient moisture and upward vertical motion. A slantwise convection from the release of CSI could support a complex snowfall event with heavier than expected amounts. The result comparison between a coupled model and an uncoupled model supports that airsea coupling has an impact of decreasing of about 10% in a snowfall amount on the snowstorm.  相似文献   

Interdecadal shift in the relationship between the East Asian summer monsoon and the tropical Indian Ocean   总被引：7，自引：0，他引：7  

Ruiqiang Ding  Kyung-Ja Ha  Jianping Li 《Climate Dynamics》2010,34(7-8):1059-1071

In this work, the authors investigate changes in the interannual relationship between the East Asian summer monsoon (EASM) and the tropical Indian Ocean (IO) in the late 1970s. By contrasting the correlations of the EASM index (EASMI) with the summer IO sea surface temperature anomaly (SSTA) between 1953–1975 and 1978–2000, a pronounced different correlation pattern is found in the tropical IO. The SSTA pattern similar to the positive Indian Ocean Dipole (IOD) shows a strongly positive correlation with the EASMI in 1953–1975. But in 1978–2000, significant negative correlation appears in the northern IO and the IOD-like correlation pattern disappears. It is indicated that the summer strong IOD events in 1953–1975 can cause a weaker-than-normal western North Pacific (WNP) subtropical high, which tends to favor a strong EASM. In 1978–2000, the connection between the summer IOD and the WNP circulation is disrupted by the climate shift. Instead, the northern IO shows a close connection with the WNP circulation in 1978–2000. The warming over the northern IO is associated with the significant enhanced 500 hPa geopotential height and an anomalous anticyclone over the WNP. The change in the IO–EASM relationship is attributed to the interdecadal change of the background state of the ocean–atmosphere system and the interaction between the ENSO and IO. In recent decades, the tropical IO and tropical Pacific have a warmer mean SST, which has likely strengthened (weakened) the influence of the northern IO (IOD) on the EASM. In addition, due to the increase in the ENSO variability along with the higher mean equatorial eastern Pacific SST in 1978–2000, the influence of ENSO on the East Asian summer circulation experiences a significant strengthening after the late 1970s. Because the warming over the northern IO is associated with the significant warming in the equatorial eastern Pacific, the strengthened ENSO–EASM relationship has likely also contributed to the strengthened relationship between the northern IO and the EASM in 1978–2000.  相似文献   

The worldwide character of the 1969–1970 impulse of the secular acceleration rate     

Jean-Louis Le Mouël  Joël Ducruix  Chau Ha Duyen 《Physics of the Earth and Planetary Interiors》1982,28(4):337-350

This paper continues earlier studies to ascertain whether the distribution of the 1969–1970 jump of the secular variation rate has a worldwide character. The geometry of the jump presents some similarities with the geometry of the secular variation itself. We give a new estimation of the westward drift rate and information about spatial and temporal variations of the secular variation field.  相似文献