ENSO phase-locking in an ocean-atmosphere coupled model FGCM-1.0

The mean climatology and the basic characteristics of the ENSO cycle simulated by a coupled model FGCM-1.0 are investigated in this study. Although with some common model biases as in other directly coupled models, FGCM-1.0 is capable of producing the interannual variability of the tropical Pacific, such as the ENSO phenomenon. The mechanism of the ENSO events in the coupled model can be explained by “delayed oscillator” and “recharge-discharge” hypotheses. Compared to the observations, the simulated ENSO events show larger amplitude with two distinctive types of phase-locking： one with its peak phase-locked to boreal winter and the other to boreal summer. These two types of events have a similar frequency of occurrence, but since the second type of event is seldom observed, it may be related to the biases of the coupled model. Analysis show that the heat content anomalies originate from the central south Pacific in the type of events peaking in boreal summer, which can be attributed to a different background climatology from the normal events. The mechanisms of their evolutions are also discussed.     

INFLUENCE OF SOIL MOISTURE AND VEGETATION ON CLIMATE CHANGES INDUCED BY THERMAL FORCING*

A land-process scheme has been incorporated in a vertical one-dimensional time-dependent atmospheric model and numerical experiments have been performed with the coupled model to examine influences of soil wetness and vegetation on climate changes associated to thermal forcing.It is showed that response of land-surface temperature to the thermal forcing becomes small with increase of soil water content and vegetation cover.Furthermore,the response is more obvious in arid climate region than in humid one.The result also shows that there exist two patterns of corresponding relation between variations in air temperature and humidity on the land surface in response to hydrologic and thermal focing.     

东疆黑戈壁近地大气边界层气象要素季节变化规律

利用东疆红柳河黑戈壁下垫面陆气相互作用观测站2017年近地大气边界层梯度探测资料和红柳河气象站天气现象观测数据,分析该地区典型晴天条件下的近地层风速、温度和比湿的四季廓线特征。结果表明:四季近地层风廓线变化规律明显。典型晴天条件下,在0.5～4 m高度内风速随高度的增加而变大的速度较快,在4～32 m范围内,白天风速随高度增大较缓慢,但夜间出现快速增大;存在明显的夜间逆温,逆温层主要集中在4～32 m,冬季逆温强于夏季,晨间0.5～32 m间的温度差可达4.6℃,且红柳河四季的气温日较差均较大,秋季可达到15.7℃;夜间比湿高于白天,秋、冬季夜间逆湿层出现在10～32 m,其比湿差为0.15 g/kg左右,夏季无逆湿现象。     

塔河油田中下奥陶统储层裂缝方解石脉U-Pb同位素年龄及油气地质意义

塔河油田中下奥陶统碳酸盐岩储层在构造活动的作用下发育多期方解石脉体,为研究储层流体演化和油气成藏过程提供了重要素材.通过岩心观察、薄片鉴定、阴极发光和微区元素分析在塔河油田中下奥陶统碳酸盐岩储层中识别出3期裂缝方解石脉体,3期脉体在阴极发光颜色、稀土元素、碳氧锶同位素以及形成时间方面都存在差异.采用激光原位方解石U-P...     

Review of Development and Application of High Resolution Global Climate System Model

Climate models have been used as an important tool to quantitatively study climate variability and to predict or project climate change in the future. One of the most important pathways for development and improvement of climate system model is to increase the spatial resolution and improve the corresponding physical parameterization schemes, which is very important for understanding climate change and improving climate prediction skill. Based on a brief introduction of the importance of developing high-resolution global climate system model, a review of recent progresses in the development and application of high-resolution models was summarized. The paper also introduced the current situation and problems for the development and evaluation of high-resolution models and focused on the key scientific and technical bottlenecks which restrict the development of high-resolution models, including the development of dynamic framework of the high-resolution ocean and atmospheric models and massive high performance parallel computing, the improvement of the sub-grid physical parameterization scheme, and mesoscale air-sea interaction. Meanwhile, the scientific objects and experiments design of the international high resolution climate model intercomparison project (HiResMIP) of the coupled model intercomparison project phase 6 (CMIP6) was introduced. Finally, we prospect the future developments and evaluations of high-resolution climate models in China was proposed.     

梧桐庄矿治理野青灰岩含水层的有效途径研究

根据矿井精查地质报告以及目前进行的综合水文地质勘探资料分析了梧桐庄矿井田野青灰岩含水层的水文地质特征以及对生产的危害特点，提出了对野青灰岩含水层的治理方针即“以治为主，查、疏、注、堵相结合，综合治理”，具体途径为“掘前超前勘探，采前查明条件，疏水降压、注浆改造底板，疏堵结合，综合治理”。     

地球化学负异常及其找矿意义

地球化学负异常的存在具有普遍性。完整的地球化学异常场应包括正异常场和负异常场。负异常按其规模和找矿意义可分为区域、矿床和矿体３个不同层次。区域负异常，可以指明区域找矿方向，圈定找矿靶区；矿床负异常指出矿床可能存在的地段；矿体负异常具体圈定矿体存在的空间位置。负异常与正异常的综合研究，有助于深化对矿床成因的认识，扩大找矿信息，提高找矿效果。     

A Study on the Dynamic Mechanism of the Formation of Mesoscale Vortex in Col Field

The mesoscale vortex associated with a mesoscale low-level jet(mLLJ) usually causes heavy rainfall in the col field.The col field is defined as a region between two highs and two lows,with the isobaric surface similar to a col.Using a two-dimensional shallow water model,the meso-β scale vortex couplets(MβVCs) induced by eight types of mesoscale wind perturbations in an ideal col field were numerically simulated.With the sizes of ～100 km,the MβVCs induced by northerly perturbation(NP) and southerly perturbation(SP) moved toward the col point.The sizes of MβVCs induced by southwesterly perturbation(SWP),southeasterly perturbation(SEP),northwesterly perturbation(NWP),and northeasterly perturbation(NEP) were relatively small for the perturbations moving toward dilatation axis.The MβVC induced by easterly perturbation(EP) and westerly perturbation(WP) could not develop because they quickly moved away from the col point,before the circulation could form.The size of the circulation was determined by the distance between the vortex and the col point.The closer to the col point the vortex was,the larger the size of vortex.The comparisons of maximum vorticity and vorticity root mean square error(RMSE) of the NP,the SWP,and the WP show that the maximum vorticity and the vorticity RMSE of the NP decreased slower than other perturbations.Therefore,the weak environment of the col field favors the maintenance of vorticity and the formation of vortex.When a mesoscale vortex forms near the col point or moves toward the col point,it may maintain a quasi-stationary state in the stable col field.     

Potential Predictability of Sea Surface Temperature in a Coupled Ocean--Atmosphere GCM

Using the Flexible Global Ocean--Atmosphere--Land System model (FGOALS)version g1.11, a group of seasonal hindcasting experiments were carried out.In order to investigate the potential predictability of sea surfacetemperature (SST), singular value decomposition (SVD) analyses were appliedto extract dominant coupled modes between observed and predicated SST fromthe hindcasting experiments in this study. The fields discussed are seasurface temperature anomalies over the tropical Pacific basin(20^oS--20^oN, 120^oE--80^oW), respectively starting in fourseasons from 1982 to 2005. On the basis of SVD analysis, the simulatedpattern was replaced with the corresponding observed pattern to reconstructSST anomaly fields to improve the ability of the simulation. The predictiveskill, anomaly correlation coefficients (ACC), after systematic errorcorrection using the first five modes was regarded as potentialpredictability. Results showed that: 1) the statistical postprocessingapproach was effective for systematic error correction; 2) model errorsources mainly arose from mode 2 extracted from the SVD analysis---that is,during the transition phase of ENSO, the model encountered the springpredictability barrier; and 3) potential predictability (upper limits ofpredictability) could be high over most of the tropical Pacific basin,including the tropical western Pacific and an extra 10-degrees region of themid and eastern Pacific.