Study on Greening Design for Spatial Landscape in Southern Yuejin District of South China Agricultural Univeristy

General situations of South China Agricultural University were introduced in this study,while planning conditions and ideas were also analyzed,which put forward the correspondingly planning and designing idea.

Initiation and evolution of the South China Sea: an overview

Different models have been proposed for the formation and tectonic evolution of the South China Sea （SCS）, including extrusion of the Indochina Peninsula, backarc extension, two-stage opening, proto-SCS dragging, extension induced by a mantle plume, and integrated models that combine diverse factors. Among these, the extrusion model has gained the most attention. Based on simplified physical experiments, this model proposes that collision between the Indian and Eurasian Plates resulted in extrusion of the Indochina Peninsula, which in turn led to opening of the SCS. The extrusion of the Indochina Peninsula, however, should have led to preferential open- ing in the west side of the SCS, which is contrary to observations. Extensional models propose that the SCS was a backarc basin, rifted off the South China Block. Most of the backarc extension models, however, are not compatible with observations in terms of either age or subduction direction. The two-stage extension model is based on extensional basins surrounding the SCS. Recent dating results indeed show two-stage opening in the SCS, but the Southwest Subbasin of the SCS is much younger, which contradicts the two-stage extension model. Here we pro- pose a refined backarc extension model. There was a wide Neotethys Ocean between the Australian and Eurasian Plates before the Indian-Eurasian collision. The ocean floorstarted to subduct northward at ~ 125 Ma, causing backarc extension along the southem margin of the Eurasian Plate and the formation of the proto-SCS. The Neotethys sub- duction regime changed due to ridge subduction in the Late Cretaceous, resulting in fold-belts, uplifting, erosion, and widespread unconformities. It may also have led to the subduction of the proto-SCS. Flat subduction of the ridge may have reached further north and resulted in another backarc extension that formed the SCS. The rollback of the fiat subducting slab might have occurred ~ 90 Ma ago; the second backarc extension may have initiated between 50 and 45 Ma. The opening of the Southwest Subbasin is roughly simultaneous with a ridge jump in the East Sub- basin, which implies major tectonic changes in the sur- rounding regions, likely related to major changes in the extrusion of the Indochina Peninsula.

TEM investigations of South Atlantic Ridge 13.2°S hydrothermal area

According to the exploration contract about polymetallic sulfides in the SWIR （Southwest Indian Ridge） signed by China with the International Seabed Authority, to delineate sulfide minerals and estimate resource quantity are urgent tasks. We independently developed our first coincident loop Transient Electromagnetic Method （TEM） device in 2010, and gained the TEM data for seafloor sulfide at South Atlantic Ridge 13.2°S in June 2011. In contrast with the widely applied CSEM （Marine controlled-source electromagnetic） method, whose goal is to explore hydrocarbons （oil/gas） of higher resistivity than seawater from 102 to 103 m below the sea floor, the TEM is for low resistivity minerals, and the target depth is from 0 to 100 m below the sea floor. Based on the development of complex sulfide geoelectrial models, this paper analyzed the TEM data obtained, proposing a new method for seafloor sulfide detection. We present the preliminary trial results, in the form of apparent resistivity sections for both half-space and full-space conditions. The results cor- respond well with the observations of the actual hydrothermal vent area, and the detection depth reached 50-100m below the bed, which verified the capability of the equipment.

Abundance and Distribution of Fatty Acids in Sediments of the South Mid-Atlantic Ridge

Sediment samples obtained from the South Mid-Atlantic Ridge were studies by gas chromatography-mass spectrometer （GC-MS） for the abundance and distributions of total fatty acids （TFAs）. Approximately 34 fatty acids were identified, with the chain-lengths ranging from C12 to C30. The total concentrations of TFAs （∑TFA） ranged from 7.15 to 30.09 μgg-l dry sediment, and ∑TFA was weakly correlated with bitumen content （R2=0.69）. The ∑TFA of samples around hydrothermal areas were significantly higher than that of samples away from hydrothermal areas, indicating intense primary production and large biomass in the hydro- thermal areas, and suggesting a close relationship between hydrothermal activity and ∑TFA of samples. The characteristics of the TFA composition in the present study are rich in monounsaturated fatty acids and lacking in polyunsaturated fatty acids, and the ra- tios between the concentrations of monounsaturated fatty acids and ∑TFAs in samples close to the hydrothermal areas, are about 0.8, but for samples far from the hydrothermal areas, they are only about 0.5. Several fatty acids （e.g., a/iC15：0 and C16：1co7）, which are signature biomarkers for sulfur-metabolizing bacteria, show the same distribution trend as ∑TFA of samples, further highlighting the close relationship between fatty acid content and hydrothermal activity and/or hydrothermal communities. The metabolic activities of hydrothermal communities, especially those of microorganisms, are likely the main source of fatty acids in samples.

Component characteristics of polycyclic aromatic compounds in sediments of the South Mid-Atlantic Ridge

10 samples of sediments obtained from the South Mid-Atlantic Ridge were measured for the abundances and distributions of polycyclic aromatic compounds（PAHs）. The total concentrations of PAHs（∑PAHs） ranged from 2.768 to 9.826 μg/g dry sediment. The ∑PAHs was higher in sample 22V-TVG10 and sample 26V-TVG05 which were close to hydrothermal fields, with the lowest value in sample 22V-TVG14 which was farthest from hydrothermal fields, suggesting a probable hydrothermal origin of ∑PAHs of samples. Approximately nine kinds of PAHs were identified, and low molecular mass tricyclic and tetracyclic aromatic compounds were predominant in the samples. The concentrations of fluoranthene which were typical as hydrothermal alteration compounds were the highest among PAHs with dry weight between 0.913–3.157 μg/g. The phenanthrene homologue was most abundant in the samples, and the ratios between parent phenanthrene and methylphenanthrene which probably reflected the degree of hydrothermal alteration ranged from 0.097 to 1.602. The sample 22V-TVG10 possessing a maximum ratio value showed the intense influence of the hydrothermal alteration on this sample, which might further imply that PAHs in sediments were mainly derived from the hydrothermal alteration.

Mathematical model of wave transformation over radial sand ridge field on continental shelf of South Yellow Sea

According to a deformed mild-slope equation derived by Guang-wen Hong and an enhanced numerical method, a wave refraction-diffraction nonlinear mathematical model that takes tidal level change and the high-order bathymetry factor into account has been developed. The deformed mild-slope equation is used to eliminate the restriction of wave length on calculation steps. Using the hard disk to record data during the calculation process, the enhanced numerical method can save computer memory space to a certain extent, so that a large-scale sea area can be calculated with high-resolution grids. This model was applied to wave field integral calculation over a radial sand ridge field in the South Yellow Sea. The results demonstrate some features of the wave field： （1） the wave-height contour lines are arc-shaped near the shore; （2） waves break many times when they propagate toward the shore; （3） wave field characteristics on the northern and southern sides of Huangshayang are different; and （4） the characteristics of wave distribution match the terrain features. The application of this model in the region of the radial sand ridge field suggests that it is a feasible way to analyze wave refraction-diffraction effects under natural sea conditions.

The distribution and composition of hydrocarbons in sediments of the South Mid-Atlantic Ridge

Sediment samples obtained from the South Mid-Atlantic Ridge are analyzed by a gas chromatography-mass spectrometer（GC-MS） for the abundances and distributions of hydrocarbons. The hydrocarbons in the samples exhibit a bimodal distribution of n-alkanes and are rich in 3-methylalkanes, 8-methylalkanes and 2, 4,（n-1）-trimethylalkanes, which may be the result of metabolic activity of benthic microorganism. Terpanes, hopanes and steranes are all enriched in the samples, which also support the microbial origin of hydrocarbons in samples.Bitumen and hydrocarbons in the samples show a trend that the contents are the highest in the Samples 22V-TVG10 and 26V-TVG05 collected near hydrothermal areas, and the lowest in samples 22IV-TVG01, 22V-TVG11,and 22V-TVG14 collected far from the hydrothermal areas, which suggest the possible influence on the samples by hydrothermal activity.

An Anomalous Seamount on the Southwestern Mid-Ridge of the South China Sea

Objective The development of continental rifting and seafloor spreading can be predominated by magmatic upwelling （magma-rich） or tectonic stretching （magma-poor）. Located in the terminal portion of propagating seafloor spreading of the South China Sea （SCS）, the southwestern mid-ridge of the southwest sub-basin （SWSB） of the SCS was found with much thin crust and numerous faulted blocks coupling with magma-poor continental margins along its flanks. Therefore, the southwestern part of the SWSB is most likely to be a tectonic-dominated basin. To justify the hypothesis with further evidence, we investigated the nature of seamounts on the southwestern mid-ridge of the SWSB which may inherit seafloor spreading.

Clay mineral distribution characteristics of surface sediments in the South Mid-Atlantic Ridge

Clay minerals are usually considered as important indicators to identify sources in both terrigenous and marine sediments.In particular,clay minerals in metalliferous sediments(MS)have long been studied in global oceans except in South Mid-Atlantic Ridge(SMAR)due to limited explorations.Thus,32 MS and 34 non-MS(NMS)samples were analyzed to clarify the distribution characteristics and mineral compositions of clay minerals.All the sediments were collected along the SMAR between 12°S and 27°S.After removal of organic matter and carbonate,clay fractions(<2μm)were investigated by Xray diffraction(XRD)analysis.Results show that clay mineral assemblages of surface MS consist dominantly of smectite,less abundant illite,chlorite,and kaolinite in average weight percentage of 30%,21%,18%,and 16%,respectively.On the other hand,clay mineral assemblages in the NMS consist mainly of illite,less abundant kaolinite,chlorite,and very scarce smectite in average weight percentage of 47%,29%,24%,and 0.2%,respectively.The clay fractions in MS are mainly composed of amorphous or poorly crystallized Fe/Mn oxyhydroxides,clay mineral,quartz,and plagioclase.However,the counterparts in the NMS are mainly composed of well-crystallized clay minerals,quartz,and plagioclase without the presence of Fe/Mn oxyhydroxides.It is suggested that most of the illite,kaolinite,and chlorite in both MS and NMS are likely aeolian dust in origin from South Africa continent.In addition,the abundance of kaolinite dominates the clay mineral assemblage at low latitudes,where the intensive chemical weathering of continental source rocks facilitating the formation of kaolinite.In terms of smectite,it is indicated of authigenic origin in consideration of only smectite is available in several MS and the absence in NMS.Moreover,the MS samples with only smectite available are always accompanied by goethite.Therefore,it is assumed that most of smectite occurred in studied area is the results of interaction between hydrothermal Fe-oxyhydroxide,silica,and seawater.

Looking towards the Future of BIM in South Korea Towards AI-Enhanced BIM

This paper provides an overview of South Korea’s 20-year journey in adopting building information modeling(BIM) and future direction. It first discusses the six phases of BIM adoption in South Korea, starting from the use of BIM as a marketing tool to its current intelligent BIM phase. The government’s support for BIM-related research and development projects is also highlighted, with a focus on the artificail intelligence (AI)-based architectural design automation project. As the future direction, it explores the integration of AI with BIM in both local and global contexts. The paper presents AIpowered architectural design methods, including AI-powered early architectural design generation and architectural detailing.Compared to AI-based early architectural design generation, architectural detailing is an unexplored research topic. This paper introduces two AI-and BIM-based architectural detailing methods, being developed at Yonsei University:namely,BIM library transplant and Natural language-based Architectural Detailing through Interaction with AI (NADIA). These methods demonstrate how AI-enhanced BIM can enable architects to interactively develop building details using a language model as a conversational AI and a knowledge base, and a BIM authoring tool as a design platform, in the near future.

Petrology and geochemistry of South Mid-Atlantic Ridge(19°S) lava flows:Implications for magmatic processes and possible plume-ridge interactions

The South Mid-Atlantic Ridge(SMAR)19°S segment,approximately located along the line of Saint Helena volcanic chain(created by Saint Helena mantle plume),is an ideal place to investigate the issue whether the ridgehotpot interaction process affected the whole MAR.In this study,we present major and trace elemental compositions and Sr-Nd-Pb isotopic ratios of twenty fresh lava samples concentrated in a relatively small area in the SMAR 19°S segment.Major oxides compositions show that all samples are tholeiite.Low contents of compatible trace elements(e.g.,Ni=239-594 ppm and Cr=456-1010 ppm)and low Fe/Mn(54-67)and Ce/Yb(0.65-1.5)ratios of these lavas show that their parental magmas are partially melted by a spinel lherzolite mantle source.Using software PRIMELT3,this study obtained mantle potential temperatures(Tp)beneath the segment of1321-1348℃,which is lower relative to those ridges influenced by mantle plumes.The asthenospheric mantle beneath the SMAR 19°S segment starts melting at a depth of^63 km and ceases melting at^43 km with a final melting temperature of^1265℃.The extent of partial melting is up to 16%-17.6%with an average adiabatic decompression value of 2.6%/kbar.The correlations of major oxides(CaO/Al2 O3)and trace elements(Cr,Co,V)with MgO and Zr show that the parental magma experienced olivine and plagioclase fractional crystallization during its ascent to the surface.87Sr/86Sr(0.702398-0.702996),143 Nd/144 Nd(0.513017-0.513177)and 206Pb/204Pb(18.444-19.477)ratios of these lavas indicate the mantle source beneath the SMAR 19°S segment is composed of a three-component mixture of depleted MORB mantle,PREMA mantle,and HIMU mantle materials.The simple,binary mixing results among components from plume-free SMAR MORB,Saint Helena plume and Tristan plume show that asthenospheric mantle beneath the SMAR 19°S segment may be polluted by both Saint Helena and Tristan plume enriched materials.The abovementioned mantle potential temperatures,together with the low Saint Helena(<10%)and Tristan(<5%)components remaining in the asthenospheric mantle at present,show that the physically ridge-hotspot interactions at SMAR 19°S segment may have ceased.However,the trace element and SrNd-Pb isotopically binary mixing calculation results imply that these lavas tapped some enriched pockets left when Saint Helena and/or Tristan plume were once on the SMAR during earlier Atlantic rifted history.

Tidal current-induced formation——storm-induced change——tidal current-induced recovery——Interpretation of depositional dynamics of formation and evolution of radial sand ridges on the Yellow Sea seafloor

The results of simulated tidal current field, wave field and storm-induced current field are employed to interpret the depositional dynamic mechanism of formation and evolution of the radial sand ridges on the Yellow Sea seafloor. The anticlockwise rotary tidal wave to the south of Shandong Peninsula meets the following progressive tidal wave from the South Yellow Sea, forming a radial current field outside Jianggang. This current field provides a necessary dynamic condition for the formation and existence of the radial sand ridges on the Yellow Sea seafloor. The results of simulated 'old current field (holocene)' show that there existed a convergent-divergent tidal zone just outside the palaeo-Yangtze River estuary where a palaeo-underwater accumulation was developed. The calculated results from wave models indicate that the wave impact on the topography, under the condition of high water level and strong winds, is significant. The storm current induced by typhoons landing in the Yangtze River estuary and turning away to the sea can have an obvious influence, too, on the sand ridges. The depositional dynamic mechanism of formation andevolution of the radial sand ridges on the Yellow Sea seafloor is ' tidal current-induced formation-storm-inducedchange-tidal current-induced recovery' .

Evolution of sedimentary environments of the middle Jiangsu coast, South Yellow Sea since late MIS 3

An evolutionary model of sedimentary environments since late Marine Isotope Stage 3 （late MIS 3, i.e., ca. 39 cal ka BP） along the middle Jiangsu coast is presented based upon a reinterpretation of core 07SR01, new correlations between adjacent published cores, and shallow seismic profiles recovered in the Xiyang tidal channel and adjacent northern sea areas. Geomorphology, sedimentology, radiocarbon dating and seismic and sequence stratigraphy are combined to confirm that environmental changes since late MIS 3 in the study area were controlled primarily by sea-level fluctuations, sediment discharge of paleo-rivers into the South Yellow Sea （SYS）, and minor tectonic subsidence, all of which impacted the progression of regional geomorphic and sedimentary environments （Le., coastal barrier island freshwater lacustrine swamp, river floodplain, coastal marsh, tidal sand ridge, and tidal channel）. This resulted in the formation of a fifth-order sequence stratigraphy, comprised of the parasequence of the late stage of the last interstadial （Para-Sq2）, including the highstand and forced regressive wedge system tracts （HST and FRWST）, and the parasequence of the postglacial period （Para-Sql）, including the transgressive and highstand system tracts （TST and HST）. The tidal sand ridges likely began to develop during the postglacial transgression as sea-level rise covered the middle Jiangsu coast at ca. 9.0 cal ka BP. These initially submerged tidal sand ridges were constantly migrating until the southward migration of the Yellow River mouth to the northern Jiangsu coast during AD 1128 to 1855. The paleo-Xiyang tidal channel that was determined by the paleo-tidal current field and significantly different from the modern one, was in existence during the Holocene transgressive maxima and lasted until AD 1128. Following the capture of the Huaihe River in AD 1128 by the Yellow River, the paleo-Xiyang tidal channel was infilled with a large amount of river-derived sediments from AD 1128 to 1855, causing the emergence of some of the previously submerged tidal sand ridges. From AD 1855 to the present, the infilled paleo-Xiyang tidal channel has undergone scouring, resulting in its modern form. The modern Xiyang tidal channel continues to widen and deepen, due both to strong tidal current scouring and anthropogenic activities.

Impact of residential building heating on natural gas consumption in the south of China:Taking Wuhan city as example

With the development of social economy,heating in the south of China has been concerned widely.As one of the energy sources of decentralized heating,natural gas(NG)has been used more and more popularly.This paper aimed to study the impact of residential building heating on NG consumption,and took Wuhan city,the representative city needing heating in winter of the south of China due to its location and climate,as an example.Firstly,a typical residential building model was established through DeST software.The heating load was simulated,and the corresponding NG consumption index was calculated.Secondly,appropriate methods were used to forecast the basic data of Wuhan city in 2020,including households and per capita gross national product(GDP),etc.Thirdly,the NG consumption of residential buildings with and without heating were predicted.Finally,the impact of residential building heating on NG consumption was analyzed.The results showed that the average annual household heating consumption of residential building in Wuhan city in 2020 was 2100 kWh/household,and the NG consumption using for residential building heating was 295 Nm 3/household.In addition,the NG consumption of residential building generated by space heating with 100%heating rate was 2.82 times the NG consumption generated by the stove and water heater,showing that residential building heating had a large impact on NG consumption.This study can contribute to choosing appropriate heating method in the southern cities of China,and further planning the gas pipe network in these cities.

A geopolitics of mud construction:Self-help and the CINVA-Ram machine in Ghana and South Vietnam during the Cold War

In 1951,the Organization of American States established the Centro Interamericano de Vivienda y Planeamiento(CINVA)to provide specialized training to tackle the housing problem.Based on archival documentation examined at the Rockefeller Archive Center and the Central and Historical Archive of the National University of Colombia,this article explores two significant episodes in which the story of one of the Center’s most successful outputs connects to the history of the ColdWar.It thus contributes to the literature investigating the architecture and related technologies of development aid in the historical context of the Cold War with a precise focus on the role of non-governmental actors.After detailing the history of the CINVA-Rammachine,the pressingmachine to producerammed-earth blocks developed at theCenter andlater exportedtoAmerica,Europe,Africa,and Asia,the article explores its deployment in two different fronts of the Cold War:Ghana and South Vietnam.As highlighted in the conclusions,the significance of CINVA-Ram use in these contexts is manyfold.Firstly,its diffusion,although appearing as a successful case of south-to-south cooperation,was in fact possible because of the Rockefeller family-controlled IBEC’s involvement.Secondly,it shows the global outreach of the intertwined action of governmental agencies,private companies,and NGOs,when fighting poverty and housing shortage via aided self-help initiatives were complementary strategies to the armed containment of Communism.Finally,it discusses the role played by US governmental and non-governmental actors in advancing US interests through technoscience,highlighting how the battle against poverty in the so-called“ThirdWorld”was in this case fought with one of the oldest andsimplest construction techniques in the ideological framework of self-help.

华南民居研究的发展历程与当代的传承创新

以华南理工大学为核心研究力量的华南民居研究团队,早在20世纪30年代便开始对中国民居建筑进行基础性研究,历经90余载的持续探索,倡导建立了民居建筑学科,形成了各具特色的多元民居研究方向,建立了稳定的民居研究队伍,取得了丰硕的民居研究成果,产生了广泛的学术影响。文章回顾华南民居研究发展历程,梳理近十余年来华南民居学术群体在跨学科多元研究方向所取得的突破性进展,包括民居与民系聚落、民居与文化线路、民居与文化地理、民居与环境景观、民居与审美文化、民居与修缮技术、民居与传承应用、民居与数字技术等内容,以期为推动中国民居研究的进一步深入和拓展提供有益参考。

先秦丘居形态及其对古代营城理念的影响

本文梳理了“丘”的概念及其五重涵义,用图形化的方式考释了“敦丘”“陶丘”“融丘”和“昆仑丘”四种丘居形态。并由此出发,解析了古代多重城制的成因,择居丘南的缘起,以及地法昆仑的三种方法,以探究丘居形态对古代营城理念的深刻影响。

利用洋中脊玄武岩中橄榄石斑晶制约南海打开的地幔动力学机制

地幔柱与板块构造是地球运行的两大基本动力学机制。南海及其周缘地区处于海南地幔柱与东南亚环形俯冲系统时空交汇的背景,而新生代地幔柱在南海形成演化过程中所扮演的角色存在颇多争议。地幔源区富含辉石岩是南海及其周缘与地幔柱活动相关的玄武岩的共有特征,基于此推测,本文利用国际大洋发现计划(IODP)367航次在南海北缘U1500B站位钻遇的南海扩张初期洋中脊玄武岩(MORB)的橄榄石成分来制约南海扩张初期的地幔岩性,以检验南海扩张初期是否存在地幔柱-洋脊叠加。U1500B MORB所含橄榄石斑晶的Fo=76.4~89.4,NiO=0.09%~0.26%,CaO=0.25%~0.34%,MnO=0.16%~0.33%。这些橄榄石斑晶具有与南海西南次海盆扩张末期U1433B钻孔的MORB以及全球其他开放大洋MORB相似的NiO、CaO、MnO含量和FeO/MnO比值,代表其源区岩性主要为橄榄岩。U1500B钻孔MORB与该区存在地幔柱叠加的基性岩浆所含橄榄石斑晶成分的差异显著,表明南海扩张初期不存在地幔柱叠加,与前人估计的U1500B洋中脊玄武岩的正常地幔潜能温度(~1380℃)相符合。由于南海扩张初期洋中脊岩浆产率高,但缺乏地幔热异常和易融组分如辉石岩等,推测其地幔中可能有较多的早前俯冲板片贡献的再循环挥发分来维持高岩浆产率。所以,俯冲板片后撤导致的岩石圈伸展可能是南海打开的主要动力学机制。

南海洋脊跃迁的深地震探测数据分析

洋脊跃迁事件是海底扩张阶段受强烈构造和岩浆作用的普遍现象,地球物理资料表明洋脊跃迁事件存在于南海多期次海底扩张过程中,然而关于洋脊跃迁的深部速度结构特征尚不清楚.2021年国家自然科学基金共享航次实施了深地震探测测线OBS2021-1,该测线横穿南海东部次海盆洋脊跃迁(J3)区域.本文介绍了该测线数据的采集情况,完成了导航文件(Ukooa文件)的制作、原始数据的格式转换、炮点位置和海底地震仪(OBS)位置校正的前期数据处理工作.结果表明,OBS2021-1测线数据质量良好,经过炮点和OBS位置校正后,OBS综合地震记录剖面可识别出多组清晰的P波震相,包括Pw、Pg、PmP以及Pn震相.根据同船采集的多道地震处理解释和国际大洋发现计划(IODP)钻探数据,建立了沿测线的初始速度模型.使用RayInvr软件初步获得了OBS2021-1测线下方的正演速度结构模型,识别洋脊跃迁的深部速度结构特征.数据处理结果表明南海洋脊跃迁的地壳厚度增厚,在多道地震剖面上存在渐新世地层的缺失,为进一步研究南海洋脊跃迁过程与构建南海形成演化历史奠定了研究基础.

5月华南气温的岭回归预测模型

该文研究5月华南气温变化特征及其成因,寻找海温前兆信号并探讨其影响气温的可能物理机制,建立5月华南气温的多元岭回归预测模型。结果表明:5月华南气温异常偏高(偏低)年表现为乌拉尔山、东亚的异常反气旋(气旋)环流,以及贝加尔湖附近的异常气旋(反气旋)环流,使东亚经向环流减弱(加强),冷空气活动减弱(加强);同时副热带高压在华南地区异常西伸(东退)和西南风减弱(加强)。海温前兆信号主要为前冬北大西洋三极子型、印度洋全区一致型,其中北大西洋海温前兆信号的相关性最强。北大西洋海温前兆信号为正(负)位相时,通过欧亚遥相关波列使经向环流减弱(增强)和冷空气活动减弱(加强),同时副热带高压在华南一带西伸(东退),有利于华南地区气温偏高(低)。利用前冬前兆信号所建立的5月气温多元岭回归预测模型,拟合效果较好并对异常年份有较好的预测能力。