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Search Results: 1 - 10 of 80866 matches for " LIU Qinyu "
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Disturbance evolution and the nonlinear stability to the basic flows for two-dimensional quasi-geostrophic motion
Shiji Song,Qinyu Liu
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885960
Abstract: The status of disturbances of both initial values and parameters in the models is further investigated, the exact explicit estimates on the disturbance energy and disturbance potential enstrophy are given; and while the initial disturbance fields rely only on the initial disturbance potential enstrophy, initial disturbance velocity circulation along the boundary, disturbance parameters, and the nonlinear stability criteria paralleling to Arnold’s second theorem are obtained, and the main results of Mu are generalized.
Mesoscale eddy effects on the wintertime vertical mixing in the formation region of the North Pacific Subtropical Mode Water
Pan Aijun,Liu Qinyu
Chinese Science Bulletin , 2005, DOI: 10.1360/982004-757
Abstract: Mesoscale eddy effects on the wintertime vertical mixing in the formation region of the North Pacific Subtropical Mode Water (NPSTMW) are studied using hydrographic data from Argo profiling floats deployed in the Kuroshio recirculation region in February and March of 2001. Anticyclonic (warm) eddy enhances the wintertime vertical mixing and results in the deep mixed layer and the deep thermocline. Consequently, a large volumetric water mass with low potential vorticity corresponding to the prototype of NPSTMW tends to be formed. By contrast, cyclonic (cold) eddy is unfavorable for the vertical mixing process and halts the deepening of the mixed layer and thus the formation of mode water. Further analysis shows that cyclonic eddies prevail in the late 1990s in the formation region of NPSTMW, which lead to significant suppression of the wintertime vertical mixing (96–98) and thus are unfavorable for the formation of NPSTMW; while the situation is completely reversed in the early 1990s (93–95).
Different Responses of Sea Surface Temperature in the North Pacific to Greenhouse Gas and Aerosol Forcing Different Responses of Sea Surface Temperature in the North Pacific to Greenhouse Gas and Aerosol Forcing
WANG Liyi,LIU Qinyu
- , 2015,
Abstract: The responses of Sea Surface Temperature(SST) to greenhouse gas(GHG) and anthropogenic aerosol in the North Pa- cific are compared based on the historical single and all-forcing simulations with Geophysical Fluid Dynamics Laboratory Climate Model version 3(GFDL CM3). During 1860–2005, the effect of GHG forcing on the North Pacific SST is opposite to that of the aerosol forcing. Specifically, the aerosol cooling effect exceeds the GHG warming effect in the Kuroshio Extension(KE) region dur- ing 1950–2004 in the CM3 single forcing. The mid-latitude response of ocean circulation to the GHG(aerosol) forcing is to enhance(weaken) the Subtropical Gyre. Then the SST warming(cooling) lies on the zonal band of 40?N because of the increased(reduced) KE warm advection effect in the GHG(aerosol) forcing simulations, and the cooling effect to SST will surpass the warming effect in the KE region in the historical all-forcing simulations. Besides, the positive feedback between cold SST and cloud can also strengthen the aerosol cooling effect in the KE region during boreal summer, when the mixed layer depth is shallow. In the GHG(aerosol) forcing simulations, corresponding to warming(cooling) SST in the KE region, the weakened(enhanced) Aleutian Low appears in the Northeast Pacific. Consequently, the SST responses to all-forcing in the historical simulations are similar to the re- sponses to aerosol forcing in sign and spatial pattern, hence the aerosol effect is quite important to the SST cooling in the mid-latitude North Pacific during the past 55 years
DYNAMICS OF NONLINEAR BAROCLINIC EKMAN BOUNDARY LAYER

Liu Qinyu,Qin Zenghao,

大气科学进展 , 1986,
Abstract: By the geostrophic momentum approximation, the wind structure and vertical motion within the non-linear baroclinic Ekman layer matching with the surface layer are determined. A comparison of the Ekman solution with the classical one is made. It is demonstrated that the contributions of baroclinity, stratification and nonlinear effects to the wind profile within the layer are all of definite importance.
Robust GEFA Assessment of Climate Feedback to SST EOF Modes

FAN Lei,Zhengyu LIU,LIU Qinyu,

大气科学进展 , 2011,
Abstract: Atmospheric response to SST variability was estimated using generalized equilibrium feedback analysis (GEFA) in the SST EOF space with synthesis data from an idealized climate model. Results show that the GEFA atmospheric response to the leading SST EOF modes is much more accurate and robust than the GEFA feedback matrix in physical space. Therefore, GEFA provides a practical method for assessing atmospheric response to large-scale SST anomalies in terms of the leading EOFs.
The Role of the Halted Baroclinic Mode at the Central Equatorial Pacific in El Ni?no Event
The Role of the Halted Baroclinic Mode at the Central Equatorial Pacific in E1 Nifio Event

SUN Jilin,Peter CHU,LIU Qinyu,
SUN Jilin
,Peter CHU,LIU Qinyu

大气科学进展 , 2006,
Abstract: The role of halted "baroclinic modes" in the central equatorial Pacific is analyzed. It is found that dominant anomaly signals corresponding to "baroclinic modes" occur in the upper layer of the equatorial Pacific, in a two-and-a-half layer oceanic model, in assimilated results of a simple OGCM and in the ADCP observation of TAO. A second "baroclinic mode" is halted in the central equatorial Pacific corresponding to a positive SST anomaly while the first "baroclinic mode" propagates eastwards in the eastern equatorial Pacific. The role of the halted second "baroclinic mode" in the central equatorial Pacific is explained by a staged ocean-atmosphere interaction mechanism in the formation of El Ni(n)o: the westerly bursts in boreal winter over the western equatorial Pacific generate the halted second "baroclinic mode" in the central equatorial Pacific, leading to the increase of heat content and temperature in the upper layer of the central Pacific which induces the shift of convection from over the western equatorial Pacific to the central equatorial Pacific; another wider, westerly anomaly burst is induced over the western region of convection above the central equatorial Pacific and the westerly anomaly burst generates the first "baroclinic mode"propagating to the eastern equatorial Pacific, resulting in a warm event in the eastern equatorial Pacific.The mechanism presented in this paper reveals that the central equatorial Pacific is a key region in detecting the possibility of ENSO and, by analyzing TAO observation data of ocean currents and temperature in the central equatorial Pacific, in predicting the coming of an El Ni(n)o several months ahead.
On the Upper Oceanic Heat Budget in the South China Sea: Annual Cycle
On the Upper Oceanic Heat Budget in the South China Sea:Annual Cycle

Yang Haijun,Liu Qinyu,Jia Xujing,
Yang Haijun
,Liu Qinyu,Jia Xujing

大气科学进展 , 1999,
Abstract: The upper oceanic heat budget in the South China Sea (SCS) is studied on the basis of ocean surface heal flux, upper sea heat storage and horizontal oceanic heat transport calculated from Comprehensive Ocean and Atmosphere Data Set. Several useful conclusions can be obtained and they are helpful for us to understand the climatologically thermal condition in the SCS. The annual variation of net heat budget reflects the adjustment and sudden change of the monsoon circulation over the SCS. The variation of upper oceanic heat storage of the SCS is tightly connected with the oceanic heat transport as well as the vertical movement in the SCS and so on.
The Role of the Kuroshio in the Winter North Pacific Ocean-Atmosphere Interaction: Comparison of a Coupled Model and Observations
The Role of the Kuroshio in the Winter North Pacific Ocean-Atmosphere Interaction: Comparison of a Coupled Model and Observations

LIU Qinyu,WEN Na,YU Yongqiang,
LIU Qinyu
,WEN N,YU Yongqiang

大气科学进展 , 2006,
Abstract: A comparative study between the output of the Flexible Global Climate Model Version 1.0 (FGCM-1.0) and the observations is performed. At 500 hPa, the geopotential height of FGCM is similar to the observations, but in the North Pacific the model gives lower values, and the differences are most significant over the northern boundary of the Pacific. In a net heat flux comparison, the spatial patterns of the two are similar in winter, but more heat loss appears to the east of Japan in FGCM than in COADS. On the interannual timescale, strong (weak) Kuroshio transports to the east of Taiwan lead the increasing (decreasing) net heat flux, which is centered over the Kuroshio Extension region, by 1-2 months, with low (high) pressure anomaly responses appearing at 500 hPa over the North Pacific (north of 25°N) in winter.The northward heat transport of the Kuroshio is one of the important heat sources to support the warming of the atmosphere by the ocean and the formation of the low pressure anomaly at 500 hPa over the North Pacific in winter.
Detection and analysis system for hybridization images of lab-in-a-tube microarray
Quanjun Liu,Qin Zhou,Yunfei Bai,Qinyu Ge,Zuhong Lu
Chinese Science Bulletin , 2005, DOI: 10.1360/982005-451
Abstract: A lab-in-a-tube microarray system is developed for sample inspection and signal detection by fabricating a flat transparent window cap of the Eppendorf tube. The oligonucleotide microarray is immobilized on the inner surface of the cap. A small vessel is placed in an Eppendorf tube for storing hybridization solutions. With the microarray system, the full biochemical processes, including gene fragment amplification, fluorescence labeling, hybridization, and fluorescence detection, have been performed in the sealed tube without opening the cap. The images are obtained from a fluorescence microscope and captured by a CCD, and the data are transported to a computer through the universal serial bus (USB). After noise reduction, signal intensity is determined from hybridization image and the presence of gene fragments is identified. The final data output includes sample information, process steps, and hybridization results. A lab-in-a-tube microarray system for detecting ten respiratory viruses at a single detection is designed. High detection throughput and accuracy have been demonstrated with the system.
印度尼西亚群岛邻近海域SST对越赤道气流的影响
刘秦玉 Liu Qinyu,王韶霞 Wang Shaoxia
大气科学 , 2000, DOI: 10.3878/j.issn.1006-9895.2000.05.07
Abstract: 利用COADS资料研究了印度尼西亚群岛邻近海域海表面温度(SST)的季节变化特征,并根据热带大气扰动量的低阶模式,分析了印度尼西亚群岛邻近SST的季节变化对越赤道气流季节变化的影响.研究结果表明:印度尼西亚群岛邻近海域年平均SST基本上关于赤道对称分布,最高温度出现在赤道附近;由于南海SST冬季较低,冬季(北半球)SST的经向差最大值(大于2℃)出现在110°E附近;夏季(北半球)最大经向温差出现在130~145°E和110°E附近,它有利于105°E越赤道气流的形成和维持.
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