On Outflow Passages in the South China Sea   总被引：2，自引：0，他引：2  

DONG Danpeng  ZHOU Weidong  YANG Yang  DU Yan 《大气科学进展》2010,27(1):60-68

Both box and inverse methods are used to study the relative importance of outflow passages of the South China Sea.The physical meaning of the box model is described in detail,and its optimization is based on the most efficient way to remove the warm and fresh water in terms of the heat and salt budgets.The box model results suggest that the Kalimantan Strait is the main outflow passage,because the water near the Kalimantan is the warmest and freshest.The system of the South China Sea advects the warmest and...  相似文献   

天山山区大气水分循环特征   总被引：1，自引：0，他引：1  

杨莲梅  杨青  杨柳 《气候与环境研究》2014,19(1):107-116

将自然正交分解(EOF)和水平空间分辨率30"的地理信息数字高程(DEM)相结合,利用1961~2010年天山山区及其周边79个气象站月降水量应用梯度距离平方反比法计算面雨量,应用2000~2010年NCEP/NCAR逐日4次再分析1°(纬度)×1°(经度)资料计算水汽输送,研究了天山山区面雨量时空分布、水汽输送和外部水汽的降水转化率特征,以及降水转化率异常的初步成因。结果表明:1)天山西部和中部降水量平均在450 mm以上,东天山和天山西南端为150 mm左右。春季、夏季、秋季、冬季的面雨量分别为291.4×108 m3、625.9×108m3、218.1×108 m3和73.6×108m3,降水量分别为108.2 mm、232.4 mm、81.0 mm和27.4 mm,年降水量为449.0 mm。2)月水汽输送量呈正态单峰型分布,7月最大、1月最小,夏季水汽输送量为全年的41.3%,冬季为11.9%,春季、秋季分别为24.5%和22.3%。3)春季、夏季、秋季、冬季和年外部水汽的降水转化率分别为10.3%、12.6%、8.5%、5.4%和9.2%,降水转化率的大小与伊朗副热带高压、贝加尔湖高压脊和西亚副热带西风急流的位置和强度配置有关。  相似文献   

涡分辨率全球海洋环流模式LICOM模拟的吕宋海峡流场的季节变化     

李云  俞永强 《气候与环境研究》2014,19(5):547-558

分析了一个1/10°的涡分辨率全球环流模式LICOM(LASG/IAP Climate system Ocean Model)对吕宋海峡附近海洋环流的模拟能力。结果表明,模拟的吕宋海峡附近上层环流及输运具有明显的季节变化特征,除6月是东向净流出外,其余月份均为西向流入,冬季流量最大。年平均流量在-3.76 Sv(1 Sv=106 m3/s),其中上层(600 m以上)流量起主要贡献,为-3.60 Sv,与目前已有的研究结果基本一致。南海通过6个海峡完成与外界的水交换,其中吕宋海峡和巴拉巴克海峡是大洋水进入南海的主要通道,其余海峡均以流出为主,流出量最大的是台湾海峡(1.99 Sv),其次是卡里玛塔海峡(1.03 Sv)。进一步分析表明,由季风引起的埃克曼输送量约占吕宋海峡流量的11%,而由季风引起的吕宋海峡压力梯度形成的西向的地转流对吕宋海峡的输运起支配作用。作为黑潮源头的太平洋北赤道流流量对吕宋海峡输运的季节变化也有一定影响。  相似文献   

Transport weighted temperature and internal energy transport of the Indonesian throughflow     

D. Tillinger  A.L. Gordon 《Dynamics of Atmospheres and Oceans》2010

A 50-year record of the Indonesian throughflow (ITF) was obtained using the Simple Ocean Data Assimilation (SODA) dataset to calculate a timeseries of Pacific-to-Indian Ocean pressure differences, which were calibrated to transport profiles using ARLINDO (1997) and INSTANT (2004–2006) observational data. The 50 year SODA based ITF transport average is 10.4 Sv; the transport weighted temperature (TWT) is 14.6 °C and the internal energy transport (IET) is 0.53 PW. The different configurations of the ITF transport and temperature profiles result in a dissimilarity in the variability of the IET and the TWT, with the IET more closely correlated with both the depth of the 18 °C isotherm in the western equatorial Pacific and the NINO3.4 index. As with the transport, the IET increases during La Niña and decreases during El Niño. The TWT is only weakly correlated with NINO3.4, suggesting that the El Niño-Southern Oscillation signal is transmitted from the Pacific to the Indian Ocean via changes in pressure and thus in transport rather than by changes in temperature.  相似文献   

Validation of a regional Indonesian Seas model based on a comparison between model and INSTANT transports     

D. Rosenfield  V. Kamenkovich  K. O’Driscoll  J. Sprintall 《Dynamics of Atmospheres and Oceans》2010

The International Nusantara Stratification and Transport (INSTANT) program measured currents through multiple Indonesian Seas passages simultaneously over a three-year period (from January 2004 to December 2006). The Indonesian Seas region has presented numerous challenges for numerical modelers — the Indonesian Throughflow (ITF) must pass over shallow sills, into deep basins, and through narrow constrictions on its way from the Pacific to the Indian Ocean. As an important region in the global climate puzzle, a number of models have been used to try and best simulate this throughflow. In an attempt to validate our model, we present a comparison between the transports calculated from our model and those calculated from the INSTANT in situ measurements at five passages within the Indonesian Seas (Labani Channel, Lifamatola Passage, Lombok Strait, Ombai Strait, and Timor Passage). Our Princeton Ocean Model (POM) based regional Indonesian Seas model was originally developed to analyze the influence of bottom topography on the temperature and salinity distributions in the Indonesian seas region, to disclose the path of the South Pacific Water from the continuation of the New Guinea Coastal Current entering the region of interest up to the Lifamatola Passage, and to assess the role of the pressure head in driving the ITF and in determining its total transport. Previous studies found that this model reasonably represents the general long-term flow (seasons) through this region. The INSTANT transports were compared to the results of this regional model over multiple timescales. Overall trends are somewhat represented but changes on timescales shorter than seasonal (three months) and longer than annual were not considered in our model. Normal velocities through each passage during every season are plotted. Daily volume transports and transport-weighted temperature and salinity are plotted and seasonal averages are tabulated.  相似文献   

东亚季风湿润区水分收支的气候特征   总被引：1，自引：1，他引：0       下载免费PDF全文

廖荣伟  赵平 《应用气象学报》2010,21(6):649-658

采用1958-2007年NCEP/NCAR月平均再分析资料,分别从水汽通量、水汽通量散度以及区域内降水量与蒸发量差计算东亚季风湿润区的水分收支,分析其差异特征,结果表明:用不同方法计算的水分收支距平年际变化的相关系数分别为0.91,0.71和0.81,误差ε百分率分别为17.4%,44.1%和44%,其中利用水汽通量和散度计算得到的季风湿润区水分收支结果很接近。总体上看,整个区域全年表现为水分收入,春季和夏季的水分收入贡献最大,秋季和冬季贡献较小。在水汽经向输送中,南边界为主要的水汽输入区。从水汽输送计算的水分收支垂直分布来看,多年平均气候态下整个区域除850 hPa存在水分支出外,其余各层均为水分收入,3种方法计算的水分收支在4个季节的年际变化明显。  相似文献   

ENSO对江西省春季降水的影响     

吴珊珊  邹海波  胡菊芳 《气象与减灾研究》2010,33(3):16-21

利用江西省83个站1970—2010年春季(3—5月)降水资料和NOAA的Ni觡o 3.4区海表温度资料,分析了ENSO事件对江西省春季降水的影响。结果表明,ENSO在衰亡年对江西省春季降水有显著的影响,ElNi觡o衰亡年春季江西地区降水偏多,易发生暴雨天气过程,江西北部和南部降水偏多最为显著;La Ni觡a衰亡年春季江西地区降水偏少,不易发生暴雨天气过程,江西东南部降水偏少最为显著。结合对应天气形势分析发现,El Ni觡o(La Ni觡a)衰亡年春季低层(850 hPa)南海的水汽输送偏强(偏弱)、上升运动偏强(偏弱)以及高层(200 hPa)辐散抽吸偏强(偏弱),是造成江西地区降水偏多(偏少)的主要原因。  相似文献   

中国东部夏季持续强降水发生的主要环流模态和水汽输送研究   总被引：1，自引：1，他引：0  

王小玲  丁一汇  张庆云 《气候与环境研究》2017,22(2):221-230

利用1957~2011年我国502个测站逐日降水资料,定义区域平均降水量连续5 d超过1个标准差为1次区域性持续强降水,分析了我国东部(105°E以东)长江流域、华北和东北地区夏季(6~8月)的强降水,共得到74个个例,并探讨了造成长江流域和华北地区持续性强降水的主要环流与水汽输送模态。结果表明,中高纬出现阻塞形势是造成我国东部夏季区域性持续强降水的主要环流型,占比86%。其中影响长江流域强降水的主要阻塞形势为中阻型(贝加尔湖为高压脊)和双阻型(乌拉尔山和鄂霍次克海同时出现高压脊);影响华北地区强降水的主要阻塞形势为中阻型。同时,必须建立一条自热带海洋至降雨区的水汽通道,长江流域强降水的水汽通道为印度洋—孟加拉湾—南海;对于华北地区,除此水汽通道外,西北太平洋水汽输送也是一个重要水汽来源。长江流域强降水的异常水汽输送在菲律宾北部出现反气旋中心,导致从南海有异常水汽输送并在长江流域辐合,这一反气旋中心对应500 h Pa上西太平洋副热带高压的加强;华北地区强降水的异常水汽输送在渤海—朝鲜半岛出现反气旋中心,异常水汽来自南海和西北太平洋。渤海—朝鲜半岛在500 h Pa出现正高度异常对维持华北地区持续降水有重要作用。深厚的上升运动或低层辐合高层辐散是华北与长江流域持续强降水发生的共同特点。中阻型和双阻型的长江流域强降水在水汽输送上没有明显差异,而是动力上升条件的分布差异决定了雨带主要位置的不同。  相似文献   

东营凹陷胜坨地区沙二上亚段古物源输送路径研究     

孙其琛  杨俊生 《地质与资源》2019,28(1):43-48

应用330余口井的钻、测井资料,绘制地层对比图与地层厚度图,建立了地层格架,揭示了地层发育情况,并通过砂岩厚度图与百分含量图,描绘了砂体沉积的分布范围.分析结果表明：胜坨油田沙二上亚段沉积时期存在3个主要物源和1个次要物源,3个主要物源分别是来自陈家庄凸起的西北部物源与东北部物源,以及来自青坨子凸起的东部物源;1个次要物源是来自陈家庄凸起的北部物源,在个别小层沉积时发育.各小层砂岩厚度分布情况揭示出研究区内部物源分配过程,即西北部物源区的碎屑物质向东南方向搬运并控制一区的沉积物质展布;东北部物源区的碎屑向西南方向搬运;东部物源区的碎屑向西搬运,来自东北部与东部的物源两者交汇并控制二、三区的沉积物质展布.物源在不同砂组或小层中其位置在一定区域内不断迁移,碎屑物质在盆地内搬运方向也随之发生变化,造成不同时期（小层）来自物源区的沉积物相互叠置.物源也同时受同沉积断层的影响,同沉积断层的走向控制了地层展布与碎屑物质在研究区内的搬运方向.  相似文献   

Effects of Activated Irrigation Water on Soil Physicochemical Properties and Crop Growth and Analysis of the Probable Pathway   总被引：2，自引：0，他引：2  

Quanjiu Wang  Yan Sun  Songrui Ning  Jihong Zhang  Beibei Zhou  Lijun Su  Yuyang Shan 《地球科学进展》2019,34(6):660-670

With the problem of shortage of water resources becoming increasingly prominent, the improvement of production efficiency of agricultural water resources in China has become an important research content of modern irrigated agriculture. The technology of activated irrigation water provides a new way to excavate the physiological production potential of irrigation water and improve the comprehensive efficacy of irrigation water in agro-ecosystems. In this study, the research progress of the variable characteristics of physicochemical properties of activated irrigation water, the transport and transformation of soil material by activated irrigation water, and the promotion of crop growth by activated irrigation water were comprehensively analyzed. On this basis, according to the basic theories of soil physics, crop physiology, and material transport dynamics, the effects of activated irrigation water on soil material transport, soil material transformation, water and nutrition uptake by root, and crop yield formation and the probable pathway were analyzed. The key problems of basic science and applied technology in the future research are put forward to provide reference for the scientific and reasonable utilization of activated irrigation water technology.  相似文献