南海上层海洋热结构的年循环与半年循环   总被引：7，自引：0，他引：7       下载免费PDF全文

高荣珍  王东晓  王卫强  周发琇  谢强 《大气科学》2003,27(3):345-353

根据南海季风试验(SCSMEX)期间南海内区的三个ATLAS(Autonomous Temperature Line Acquisition System)锚碇浮标资料(1998年4月～1999年4月),采用谐波分析方法对南海上层海洋水温年循环、半年循环加以分离,发现无论在年循环还是在半年循环尺度上,18°N附近SCS1站与13°N附近SCS3站的水温变化次表层与表层呈反位相;15°20′N附近SCS2站水温变化基本上次表层与表层同位相.这说明不同区域上层海洋热变化受不同的正压与斜压模态控制.其次,SCS2、SCS3两点水温年循环振幅均在次表层达到极值;而SCS1在表层达到极大值,在100 m深度达到次极大值.3个站位水温半年循环振幅极值均出现在次表层内,这说明该层内的水温半年循环在温度变化趋势中所占的权重比在表层的权重大.  相似文献   

北极涛动和南极涛动的年变化特征   总被引：19，自引：2，他引：19       下载免费PDF全文

范丽军  李建平  韦志刚  董文杰  Julian Wang 《大气科学》2003,27(3):419-424

北极涛动(Arctic Oscillation,简称AO)和南极涛动(Antarctic Oscillation,简称AAO)分别用于描述北半球和南半球热带外气候变率的主要模态,它们分别是北半球和南半球中纬度和高纬度之间气压变化的跷跷板结构.作者利用1958年1月～1999年12月的NCEP/NCAR全球再分析月平均资料、北极涛动指数IAO和南极涛动指数IAAO来研究AO和AAO的年变化特征以及AO和AAO与纬向平均的月平均各要素场的相关系数随纬度和月份的变化规律.  相似文献   

Amplitude—Phase Characteristics of the Annual Cycle of Surface Air Temperature in the Northern Hemisphere   总被引：2，自引：0，他引：2  

Alexey V.ELISEEV  Igor I. MOKHOV 《大气科学进展》2003,20(1):1-16

The amplitude-phase characteristics(APC)of surface air temperature(SAT)annual cycle(AC)in the Northern Hemisphere are analyzed.From meteorological observations for the 20th century and meteorological reanalyses for its second half,it is found that over land negative correlation of SAT ACamplitude with annual mean SAT dominates.Nevertheless,some exceptions exist.The positive correlationbetween these two variables is found over the two desert regions:in northern Africa and in Central America.Areas of positive correlations are also found for the northern Pacific and for the tropical Indian and PacificOceans.Southward of the characteristic annual mean snow-ice boundary (SIB) position,the shape ofthe SAT AC becomes more sinusoidal under climate warming.In contrast,northward of it,this shapebecomes less sinusoidal.The latter iS also found for the above-mentioned two desert regions.In theFar East(southward of about 50°N),the SAT AC shifts as a whole:here its spring and autumn phasesoccur earlier if the annual  相似文献   

干热风年型的模糊综合评判     

郭小芹  王宇春 《干旱气象》1997,(4)

根据武威１９８０—１９９７年春小麦产量和气候资料，利用模糊综合评判对干热风年型进行预测。预报效果好，实用性强。  相似文献   

地磁1年周期变化的响应函数     

陈伯舫 《地震地磁观测与研究》1997,18(2):40-44

用通日月均值减去夜均值计算的月均值资料和Ｓｏｍｐｉ谱分析法分析了１４个台站的北向分量１年周期变化的振幅向相位，时段为１９８４－１９８８年。分析结果显示用Ｐ＾０ｎ（ｄｎｄ＝１，…，６）复合模式的估算的Ｃ值较合理。各台的Ｃ值比较一致。  相似文献   

CLIMATIC RECORDS FROM ANNUAL LAYERS AND STABLE ISOTOPES OF A STALAGMITE IN BEIJING OVER THE LAST 2300 YEARS     

Tan Ming Qin Xiaoguang Liu Tungsheng Laboratory of Speleothem  Paleoclimatology  Institute of Geology  CAS  Beijing People’s Republic of China 《地理学报(英文版)》1997,(3)

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＳｔａｌａｇｍｉｔｅｓｈａｖｅｂｅｅｎａｐｐｌｉｅｄｔｏｕｓｅａｓｈｉｇｈｒｅｓｏｌｕｔｉｏｎｐａｌｅｏｃｌｉｍａｔｉｃｉｎｄｉｃａｔｏｒｓｓｉｎｃｅｔｈｅａｎｎｕａｌｇｒｏｗｔｈｂａｎｄｉｎｇｗａｓｒｅｃｏｇｎｉｚｅｄｉｎｓｔａｌａｇｍｉｔｅｓ[1,2].Ａｎｎｕａｌｇｒｏｗｔｈｂａｎｄｉｎｇｃａｎｂｅｍａｎｉｆｅｓｔｅｄｉｎｓｅｖｅｒａｌｍａｎｎｅｒｓｄｅｆｉｎｅｄｂｙ1)ａｌｔｅｒｎａｔｉｎｇｆｌｕｏｒｅｓｃｅｎｔａｎｄｎｏｎ-ｆｌｕｏｒｅｓｃｅｎｔｃａｌｃｉｔｅ[3,4];2)…  相似文献   

Using rainfall-runoff modeling to interpret lake level data   总被引：2，自引：0，他引：2  

Lars Bengtsson  Joakim Malm 《Journal of Paleolimnology》1997,18(3):235-248

Using water balance computations, the behavior of different kinds of lakes is discussed. Simple analytical expressions relating water level to hydrological conditions and lake bathymetry are given. The importance of knowing the river basin area when analyzing lake levels is stressed. A conceptual rainfall-runoff model including lake routing is used to simulate runoff and lake levels and to compute quasi-steady state conditions and long-term transient situations. It is suggested that models can be used to construct curves relating lake levels to precipitation and lake evaporation. By comparing with paleo-lake levels, the annual precipitation related to these levels can be found, provided information is available about the seasonal distribution of the precipitation.  相似文献   

Ibex diggings in the Negev Desert highlands of Israel as microhabitats for annual plants. Soil salinity, location and digging depth affecting variety and density of plant species   总被引：1，自引：0，他引：1  

Yitzchak Gutterman 《Journal of Arid Environments》1997,37(4):665-681

About 400 Nubian ibex (Capra ibex nubiana) dig many hundreds of temporary night beds, approximately 80 cm × 110 cm and 15 cm deep, on slopes near the edges of the cliffs bordering the Zin valley. The beds are used according to the wind direction and the size of the ibex group, which depends on the ibex social behaviour during the year.The diggings are gradually abandoned and become important microhabitats for seed accumulation and germination, seedling development and annual plant establishment. These are influenced by soil salinity, slope direction and angle, digging depth, and the time since the diggings were abandoned. A greater variety of plant species and plant density were found in these diggings than upslope from the diggings.  相似文献   

Runoff Scaling in Large Rivers of the World     

Hugo A. Loiciga 《The Professional geographer》1997,49(3):356-364

Runoff and precipitation scaling with respect to drainage area is analyzed for large river basins of the world, those with mean annual runoff in excess of 10 k³/yr. The usefulness of the specific runoff (runoff per unit drainage area, m/yr) to categorize runoff scaling laws across the complete spectrum of climatic and hydrologic conditions is evaluated. It is found that (1) runoff scales with drainage are in those river basins with specific runoff in excess of 0.15 m/yr (r² = 0.88); (2) runoff scaling with drainage area shows remarkably high statistical correlation (r²= 0.97) in river basins with specific runoff equal to or larger than 1.0 m/yr; (3) runoff does not Inc.rease with Inc.reasing drainage area in river basins with specific runoff below 0.15 m/yr, where no discernible statistical association was found between runoff and drainage area; and (4) precipitation depth (m/yr) is inversely proportional to drainage area raised to a fractional exponent in river basins with specific runoff in excess of 0.15 m/yr.  相似文献   

天山北坡降水对河流水沙情势影响     

陈亚宁  李卫红 《山地学报》1997,(1)

以天山北坡头屯河流域为例，在对山区不同海拔的降水特征、侵蚀产沙情势以及河流水沙运移特点分析的基础上，详尽就山区降水对河流水沙情势的年际变化、年内变化以及月变化的影响进行了分析研究，并就降水对不同海拔的河流水沙情势的影响强度及相互关系作了探讨．  相似文献