Abstract:Tropical cyclone motion is numerically simulated in the context of a quasi-geostrophic three-layer baroclinic model with detailed analysis of an asymmetric circulation and its relation to the cvclone motion,Restilts show that combination of the linear beta term and nonlinear vorticity advection produces gyres both of large and small scales and that the steady interaction between these pairs will lead to the oscillation in speed and vacillation in direction for a tropical cyclone.

Abstract:The total cloud band is known to be an indicator of the frontal edge of monsoon and hence Japan Meteorological Agency satellite total cloudiness is applied for the advance/retreat of monsoon.Substantial results which would had hardly been derived by conventional data are obtained.The seasonal advance/retreat of the monsoon over East Asian longitudinal scope could be displayed by the activities of two clotid bands,one at low latittides and the other at Northern Hemisphere midlatitudes on a yearly basis from March 1988 to Febrtiary 1989.Accordingly,the anntial cycle of the feature over the study are,particularly those that play the role over the South-China Sea to western Pacific and Indonesia/North Atisralia. Also,the results show that the low-freqtiency wave of the total clotid cover will propagate from mid into low latitudes and farther into midlatittides of the other hemisphere,During the propagation, the wave is intensified(weak-ened)in the monsoon(non-monsoon) region.

Abstract:Using Kuo-Qian p-σ incorporated coordinate five layer primitive equation medel,investigation is undertaken of the influence of low-frequency convective heating sources over the Sotith-China Sea to Philippines on East Asian atmospheric circtilation. Results show that with the low frequency sources at heating(cooling)phase the west wind becomes strengthened(weakened)in the Atistralian upper troposphere and so does the 120°E cross equatorial flow in the lower troposphere,with the subtropical high positioned slightly northward(southward)of its mean,a situation that allows the low-level SE(SW)wind to exert effects on rainfall over the scaboard of eastern China.

Abstract:The fertility alteration in photo-senstitive genic male sterile rice(PSGMR)is the integrated resuIt of photo-thermal coi1ditions 5 to 15-20 days prior to the earing stage with the numerical relation presented by a qtiantified grains-producing rate model.Results show that the fertility of the thermo-sensitive PSGMR is controlled largely by temperature over that period and that of the photo-sensitive type by insolation when it is longer than the potimum daylength and otherwise by temperattire. Moreover,the temperature and insolation are inter-supplementary in their impacts on fertility,and below(above)the optimum temperature the sterility has its critical daylength elongated(shortened)with increasing temperatuve,The photo-temperature equivalent can be taken as a tiseftil measure of temperattire aidinsolation influencing the fertility,The general diagrams of the fertility change based on the quantified grains-prodticing rate model and its mechanisms provide a scientific basis for the seed selection,development and reproduction ofsterilitv rice.

Abstract:A radiative-convective model is developed to examine the sensitivity of winter midlatitude warming in relation to increasing CO₂ amount.Results show that i)the temperature change exhibits a nonlinear growth,faster initially and slow afterwards,under progressive increase of the gas;ii)the mean temperature amplittide displays some degree of stability.

Abstract:To meet the needs of commodity economy and moderri agriculture development,a concept of “shadowprice”is introduced to investigate and evaluate the agroclimatic resources exploitation/utilization level with the economic benefits be included by which to provide a new route for decision-making in scientific assessment and rational utilization of the resources.

Abstract:The paper proposes a nested quasi-geostrophic barotropic model with its applicability verified.Two experiments are conducted with different initial fields available and analysis is performed of effects of the field structure on typhoon tracks,indicating that random nature is inherent in typhoon motion.

Abstract:Based om T─42 spectral model objectively analyzed gridded data,calculation is done of all physical quantities associated with moisture transfer during the Changjiang-Huaihe Meiyu raingush event from 0800 BST July 10 to 0800 July 11,1991,followed by study of the moisture sources and passages.Results suggest that the water comes largely from two sources,one at the Bay of Bengat and the other over the South-China Sea and area to the east;the rainband has two vital vapor sotirces at 850～500hPa layer with a still more important one at the Sea which offers water for the raingush mainly through SW and SE monsoon;water fron the Bay of Bengal has its part transported upward to levels higher than 850hPa with the aid of the Indian monsoon depression and further carried by SW flow into the rainbeolt and anothe rpart transferred by west-erly flow on the south side of the monsoon depression via the Indo-China peninsula into the Seaand area to the east,confluencing with SE monsoon and advancing northward into the Changjiang- Huaihe drainage .Besides,southwesterly flow over India carries water towards the east alongside the sotith foot of the Himalayas into the Meiyu rainstorm region.

Abstract:The display of complex empirical orthogonal ftinction(EOF)analyses has been improved,deriving amplitude/phase fuctions on space/time basis,with the space/time amplitude/phase functions diagrams given in this paper.Experiments and real case analyses indicate their visuality quite well.

Abstract:Presented is classification of the starting times for late-spring to early summer floed rain in South Chiiia in the light of more objective analysis of long-term dataset,followed by examining the rainfall characteristics at the starting time,the difference in 500hPa mean circulation before and after the start and the circulation features in relation to different rainfall patterns.Evidence suggests that the mean circtilation undergoes marked change before and after,i.e.,the prestart circulation field favors the rise in temperature and humidity while the post-start field promotes cold air invasion into South China;at the beginning of the wet sea:on precipitation exhibits six dominant patterns,each corresponding to a particular circulation pattern;for different circulation situations moisture transfer and cold air display discrepancy in vigor,giving rise tto diversity of rainfall.

Abstract:Starting from the soil water balance equation for rainfed fields,a dynamic model is constructed for arid-land soil water regime with the chief budget terms considered in a comprehensive fashion and necessary improvement done on the percolation estimate. For the water change on a decade basis,simulation has been undertaken in terms of the data from non-irrigated land measured by Tianstui Weather Station,Ganshu and Jingyang Station,Shanxi,both located in semi-arid climate. Restilts show that the modelling has yielded good outcome that best describes the soil water change in these regions.

Abstract:Fo1lowing hydrodynamic tenets,an energetic eqtiation model is prepared for canopy-level turbulence with the restilts verified against measurements from wheat and corn fields.

Abstract:Outlined are the design scheme of an Upper-Air Weather Map Automatic Analytic System with the principal techniques for its realization,which comprises both the data handling and graphic processing. Analysis shows that studied weather system displayed an intact picture without any detail missing,with the low/high pressure cores right in plaoe and contours drawn justified.

Abstract:This paper investigates the relation of the severe calamity-early spring drought in Guangxi province to anomalous atmospheric circulation and its physical catises.Study shows that major weather systems assoclatecl with、the. disaster include the Australian upper-air high,sub-tropical high, tropical coiivective activitics and Eurasian high ridge;the circulation systems over northern mid-low latitudes and in the Southern Hemisphere in the year of the drought happening are intense Australian upper-level high,vigorotis subtropical high and strong upper westerly jet-streak at extratropics with the Eurasian high’s riclge located westward of its mean and cold airpassage shifted eastward.

Abstract:sing stepwise interpolation and multi-regression analysis,calculation is made of 10’×10’grid interpolations of temperature for January and July over Guizhou mountain area. Error analysis of the two techniques shows the computation of the stepwise interpolations is closer to reality with the residual error is five to tem times smaller as compared to the multi-regression analysis.

Abstract:Phase space continuation is done of 1D monthly mean temperature series and from a reconstructed dynamic system based on the assumed fractual dimension,a new system is rebuilt again by finding coefficients of all terms of the phasee space state variables equation through the least square method under the assumption of quadratic nonlinear terms available. Results show that as the phase space dimensionality increases the newly reconstrticted dynamic system can give the climate evolution a more precise and detailed description.

Abstract:In virtue of an econometric model used for the first time in、ameteorological context,localize forecasting equations for some typhoon elcments are established for 24、 48 and 72 hrs in advance with some significant rcsults achieved.

Abstract:Based on summer high temperature/humidity characteristics over the study area,analysis is performed separately of the effects of temperature, humidity and their combination(temperature-humidity index)tipon layer condition of eggs,deriving the period and intensity features of the hot stress. Evidence stiggests that the stress occurs for June through August,with the serious happening between mid July an early August,especially in late July.

Abstract:The paper is devoted to the problem of the role of an presstire field in the adjustment of the wind in a neutral nonlinear barotropic planetary boundary layer(PBL);Evidence suggests that any initial wind field will adjust itself towards a given pressure pattern through absolute vorticity oscillation and viscous coefficient dissipation,leading to the adjustment time scale[O(t^(-3/2))],faster than[O(t^(-1)] for quasi geostrophic adaptation in the free atmosphere.

Abstract:Three-year daily field observations show that the number of hours of usual light intensity varies, depending on the sky state for the research area,with the increased(decreased)number on a clear(rainy)day aidlow temperattire in connection with short period of insolation.For the study region,the period of light intensity E> 50lx and the number of insolation > 13h and 45 min spai1s June to August 1,a condition that meets the needs of light for the photoperiod-sensitive genic male sterile rice.