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您的检索式：作者名="Johnny CLCHAN"
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| 1 | Microphysical Characteristics of Extreme-Rainfall Convection over the Pearl River Delta Region, South China from Polarimetric Radar Data during the Pre-summer Rainy Season显示文摘During the pre-summer rainy season,heavy rainfall occurs frequently in South China.Based on polarimetric radar observations,the microphysical characteristics and processes of convective features associated with extreme rainfall rates(ERCFs)are examined.In the regions with high ERCF occurrence frequency,sub-regional differences are found in the lightning flash rate(LFR)distributions.In the region with higher LFRs,the ERCFs have larger volumes of high reflectivity factor above the freezing level,corresponding to more active riming processes.In addition,these ERCFs are more organized and display larger spatial coverage,which may be related to the stronger low-level wind shear and higher terrain in the region.In the region with lower LFRs,the ERCFs have lower echo tops and lower-echo centroids.However,no clear differences of the most unstable convective available potential energy(MUCAPE)exist in the ERCFs in the regions with different LFR characteristics.Regardless of the LFRs,raindrop collisional coalescence is the main process for the growth of raindrops in the ERCFs.In the ERCFs within the region with lower LFRs,the main mechanism for the rapid increase of liquid water content with decreasing altitude below 4 km is through the warm-rain processes converting cloud drops to raindrops.However,in those with higher LFRs,the liquid water content generally decreases with decreasing altitude. | Hao HUANG Kun ZHAO Johnny CLCHAN Dongming HU | 2023 | Advances in Atmospheric Sciences2023，40，5： | 1 |
| 2 | Tropical cyclone forecasting with model‐constrained 3D‐Var. I: Description显示文摘 | XudongLiang BinWang Johnny CLChan YihongDuan DongliangWang ZhihuaZeng MabLeiming | 2007 | QJR Meteorol Soc2007，，622： | 1 |
| 3 | Preface to the Special Issue:Climate Change and Variability of Tropical Cyclone Activity显示文摘Tropical cyclones(TCs) are one of the most destructive natural phenomena on Earth in terms of human-life and economic losses. It is currently a matter of prodigious public and scientific interest how TC activity has changed and will change in a warming climate. This special issue focuses on a challenging subject raised in the Intergovernmental Panel on Climate Change(IPCC) report and numerous research papers. | Liguang WU Bin WANG Johnny CLCHAN Kyung-Ja HA Il-Ju MOON Jun MATSUMOTO Zhemin TAN Ke FAN | 2022 | Advances in Atmospheric Sciences2022，39，2： | 0 |
| 4 | Recent Unusual Consecutive Spring Tropical Cyclones in North Atlantic and Winter Oceanic Precursor Signals显示文摘Although the North Atlantic(NA)hurricane season has been reported to start increasingly early,historical longterm changes in NA spring tropical cyclone(TC)activity have not been examined in previous studies.We find that spring TCs have become more frequent and intense,and they have more closely approached the US coastline over the past four decades,thus increasing the probability of landfall.A long-term increase in the NA sea surface temperature(SST)and northward incursion of warm water may be responsible for the increasing number,intensity,and northward shift of spring TCs.In addition,the interdecadal winter NA SST tripole mode may induce a North Atlantic Oscillation(NAO)-like atmospheric response in the following spring,which controls spring TC tracks via modulating the strength and position of the NA subtropical high(or the Bermuda high).The superposition of the interdecadal positive winter SST tripole on the NA warming trend has contributed to the anomalous enhancement and northward shift of spring TC activity,increasing the spring TC risks in the US in the past six years. | Hong HUANG Jeremy Cheuk-Hin LEUNG Johnny CLCHAN Jimin LIU Weihong QIAN Banglin ZHANG | 2023 | Journal of Meteorological Research2023，37，2： | 0 |
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