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A Nonlinear Coupled Soil Moisture-Vegetation Model

Advances in Atmospheric Sciences 2005年第3期22卷 337-342页

作者：刘式适刘式达付遵涛孙岚 school of physics & laboratory for severe storm and flood disasterpeking university Beijing 100871 school of physics & laboratory for severe storm and flood disasterpeking university Beijing 100871 State Key Laboratory for Turbulence and Complex Systems Peking University Beijing 100871 school of physics & laboratory for severe storm and flood Disaster Peking university Beijing 100871 State Key Laboratory for Turbulence and Complex Systems Peking University Beijing 100871 Chinese Academy of Meteorological Sciences Beijing 100081

Based on the physical analysis that the soil moisture and vegetation depend mainly on the precipitation and evaporation as well as the growth, decay and consumption of vegetation a nonlinear dynamic coupled system of soil moisture-vegetation is established. Using this model, the stabilities of the steady states of vegetation are analyzed. This paper focuses on the research of the vegetation catastrophe point which represents the transition between aridness and wetness to a great extent. It is shown that the catastrophe point of steady states of vegetation depends mainly on the rainfall P and saturation value υ0, which is selected to balance the growth and decay of vegetation. In addition, when the consumption of vegetation remains constant, the analytic solution of the vegetation equation is obtained.

关键词： vegetation steady states equilibrium points catastrophe point cusp catastrophe

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Exact Solutions to Degasperis-Procesi Equation

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Communications in Theoretical physics 2008年第7期50卷 48-50页

作者： ZHANG Lin-Na FU Zun-Tao LIU Shi-Kuo school of physics ＆ laboratory for severe storm and flood Disaster Peking University Beijing 100871 China State Key laboratory for Turbulence and Complex Systems Peking University Beijing 100871 China

In this paper,dependent and independent variable transformations are introduced to solve the Degasperis-Procesi *** is shown that different kinds of solutions can be obtained to the Degasperis-Procesi equation.

关键词： Jacobian elliptic function Degasperis Procesi equation transformation

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Extreme large-scale atmospheric circulation associated with the“21·7”Henan flood

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Science China Earth Sciences 2022年第10期65卷 1847-1860页

作者： Jun XU Rumeng LI Qinghong ZHANG Yun CHEN Xudong LIANG Xiujie GU National Meteorological Center of China Beijing 100081China Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China State Key laboratory of severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081China Henan Meteorological Observatory Zhengzhou 450003China

From July 19 to 21,2021,Henan,a province in northern China(NC),was affected by severe flooding(referred to hereafter as“21·7”)caused by a prolonged record-breaking extreme precipitation(EP)*** the extremes of the large-scale circulation pattern during“21·7”is essential for predicting EP events and preventing future *** this study,daily atmospheric large-scale circulations over NC in the summers from 1979 to 2021 were investigated using the circulation classification method of an obliquely rotated principal component analysis in T-mode(PCT).The geopotential heights at 500 hPa and 925 hPa were applied successively in *** the nine summer circulation patterns found at 500 hPa,the three days of“21·7”belonged to the Type 8 pattern,which had the second highest probability of EP days among all *** was characterized by a southeasterly wind toward North China Plain driven by a dipole geopotential height field,with the West Pacific subtropical high(WPSH)extending far north to 30°N and low pressure to the south near *** cyclones(TCs)occurred on 72.5%of EP days,in which larger amounts of precipitation and a longer duration of EP days were found along the mountains in NC,as compared with other *** distribution of EP events under this pattern was mainly influenced by the location of the low pressure at 925 hPa in the *** subtype 8-3 circulation,with low pressure in the east of Taiwan Island,included“21·7”and accounted for 1.6%of all summer *** In-fa,together with the WPSH,gave rise to intense column integrated moisture flux convergence(IMFC)via the southeasterly wind to Henan,which occurred continuously during the 3 days of“21·7”,resulting in the largest(second largest)mean IMFC among 3 consecutive EP days under type 8(all types)during the past 43 summers in *** analysis revealed that the large-scale dynamic process could not completely explain the record-breaking EP during“21·7”,indicating p

关键词： flood Extreme precipitation Large-scale circulation pattern

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