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An improvement on summer regional climate simulation over East china: importance of data assimilation of soil moisture

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An improvement on summer regional climate simulation over Ea...

Research and application on the technology system of multi-scale assessment of the impact on the atmospheric environment by urban planning

第七届全国优秀青年气象科技工作者学术研讨会

作者： HU YaMin1, 2, DING YiHui3.& LIAO Fei2 1 Guangdong Climate center, Guangzhou 510080, china 2 Institute of Tropical and Marine Meteorology, china {3. administration, Guangzhou 510080, china 3.National Climate center, china {3. administration, Beijing 100081, china

The Newtonian relaxation is used to assimilate data from the Second Global Soil Wetness Project (GSWP2) into the initial field for soil moisture in a regional climate model (i. e., BCCegCM 1.0, hereinafter called RegCM). The results show that different nudging parameters can improve the simulation of the air temperature and the precipitation to some extent in summertime sea-son over East china. When the nudging intensity is 0.5 and nudging duration is 5 days, the result is desirable. Introducing the data assimilation of soil moisture into RegCM, the amelioration is not only in the spatial distribution pattern but also in the mag-nitude of the temperature and the precipitation. More specifically, the assimilation experiments have corrected the systematical cold bias of the air temperature and the precipitation on the low side, which is much closer to the observation compared with the control experiment. On the whole, the assimilation experiments shed light on the fact that the simulated bias in the original RegCM may be affected by the description of soil moisture in the land surface process. Therefore, the effect of soil moisture in RegCM should be paid more attention in the future.

关键词： soil moisture Newtonian relaxation data assimilation regional climate simulation

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Science china Earth Sciences 2005年第Z2期48卷 173-184页

作者： WANG Guangtao, WANG Xiaoyun, MIAO Shiguang, JIANG Weimei, GUO Wenli, JI Chongping & CHEN Xianyan School of Architecture, Tsinghua University, Beijing 100084, china Ministry of Construction of china, Beijing 100044, china Beijing {3. Bureau, Beijing 100089, china Institute of Urban Meteorology, china {3. administration, Beijing 100089, china Department of Atmospheric Sciences, Nanjing University, Nanjing 210093. china School of Architecture Tsinghua University Beijing 100084 China Ministry of Construction of china Beijing 100044 China School of Architecture Tsinghua University Beijing 100084 China Beijing meteorological Bureau Beijing 100089 China Institute of Urban Meteorology China Meteorological Administration Beijing 100089 China Department of Atmospheric Sciences Nanjing University Nanjing 210093 China Beijing meteorological Bureau Beijing 100089 China

Improvement of the atmospheric environment in urban planning is an important issue to implement the sustainable development of cities. In this paper, in order to meet the demand of planning office to compare and assess quantitatively of the designs in multi-scale, based on geographical information system (GIS) data with high resolution, a multi-scale numerical modeling system for the atmospheric environment impact of urban planning is set up, and the multi-scale assessment index system is established, which compose the technology system of multi-scale assessment of the impact on the atmospheric environment by urban planning. In urban planning (urban development of Beijing) and optimizing layouts of Olympic Green, it has been applied to quantitatively evaluating the impact on atmospheric environment by urban planning before construction, which offers scientific foundation to optimize the whole and local urban layout.

关键词： urban planning, atmospheric environment, multi-scale, numerical simulation, assessment index system.

Model calculation of air-sea heat fluxes over ocean area near china with GEOS DAS system

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Acta Oceanologica Sinica 1999年第3期18卷 401-411页

作者：周明煜钱粉兰 Natl. Mar. Environ. Forecast. center State Oceanic Administration Beijing 100081 China

The sensible and latent heat fluxes over the ocean area near china were calculated and analyzed by usingthe Goddard Earth Observing System (GEOS) - four-dimensional Data Assimilation System (DAS). The calculated results showed that the sensible heat flux had its large value in winter and autumn , small value in spring and summer overthe ocean area near china. In winter, the sensible heat flux increased distinctly with latitude, and its isolines were verycrowded. Over the ocean area east of Taiwan Province and south of Japan, the direction of isoline was from southwestto northeast. In the South china Sea the sensible heat flux was lower than that of surrounding ocean areas,and its isoline was distributed into a type of an inverted trough. In autumn and winter, the maximum {3. of latent heat flux appeared over the ocean area northeast of Taiwan Province and south and southeast of Japan, meanwhile, the isoline wasin the direction of southwest to northeast. In spring and summer, the latent heat flux had minimum value in the Huanghai Sea. At the same time, the maximum value {3. of latent heat flux appeared over the ocean area south of Japan inspring.

关键词： GEOS DAS system the ocean area near china sensible heat flux latent heat flux

A new type of Shipboard meteorological Satellite Receiving-processing System

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Acta Oceanologica Sinica 2000年第1期19卷 35-46页

作者： Xie Simei Hao Chunjiang Zou Bin Jing Qiyi Liao Xiaohong Sheng Xiaowen Zhang Canrong (1. National Research center for Marine Environment Forecasts, Beijing 100081, china 2, Second Institute of china Aerospace Corporation 3. Beijing Chuanyi Electric Compan Natl. Res. Ctr. Mar. Environ. F. Beijing 100081 China Second Inst. of china Aerosp. Corp. China Beijing Chuanyi Electric Company Chinese Academy of Sciences Beijing China

The Shipboard meteorological Satellite Receiving-processing System (SMSRPS) is specially developed for the navigation meteorological safeguard of the Antarctic exploration ship over the sea ice area of the forth Ocean. This system can suit to the climate environment of very high temperature high moisture and very low temperature - supersaturation; it has a self-protection ability to against the hurricane - force wind over force 12 and the strong vibration during icebreaking, as well as strong magnetic disturbance. It has two sets of receiving-imagery processing systems for polar orbit low-resolution and quasi-stationary high-solution satellites. The key creation Points of this system are as follows: 1. the active gyro-control stabilization platform and a mixed mounting system of three rotating a - B and x -- y axes are used. It solved the tracing difficulties both in the low elevation angle and very high elevation angle of polar-orbit satellite, even in the status of ship moving with continuously changing its poition, direction and ship roll and pitch. 2. Imagery processing subsystem. The newest BORLAND-- DELPHI language and PASCAL language pro gramming software are used under WINDOWS 95 environment. It has a dynamic positioning nested-grid system and electric mapping grid data system. It can show the latitude-longitude of any point on the map, and marks any object such as ship, station or island, and draws the route. It can monitor cloud and temperature, forest fire, anomalous change of ocean and land. It can output satellite cloud maps of 24 bit with very high clarity. This system is very advanced in technique for the whole structure with the features of small volume, light weight and very low cost. It suits to very bad climate and ocean environment. Its imagery process ing system has complete functions with high resolution and being very easy to operate. It is not only suit to land use, but also and specially to all kinds of ship over the sea. It can be exte

关键词： Shipboard meteorological Satellite Receiving-processing System imagery processing system active gyro-control platform

Optimization　of　harmonious　development　on　regional　energy－economy－atmospheric　environment　system

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Journal of Environmental Sciences 1996年第4期8卷 390-396页

作者： Ning Datong,Wang Lei(Chinese Real Estate Appraisal and Consulting center,State Land administration, Beiging,china.)(Institute of Environmental Sciences,Beijing Normal University,Beijing 100875,china) Institute of Environmental Sciences Beijing Normal University Beijing 100875 China Chinese Real Est. Appraisal/C.C. State Land Administration Beiging China

The energy,industrial economy and atmospheric environment were taken into account as a whole cornplex system in this study. Based on the application of grey system theory and the analysis of development coefficients about major parameters of the system,the method of grey developrnent decision was approached, and a new concept-integrated development coefficient was put forward. Furthermore,the reasonable ranking of development decision within eight industrial sectors(building materials,coking,food and drink,chemical engineering,paper rnaking,machinery and electrical appliance,textile, mining)has been concluded from the viewpoint of economic growth, energy saving and ambient air quality protection.

关键词： economy atmospheric environment grey development decision.

Microwave Sintering of W-15Cu Ultrafine Composite Powder Prepared by Spray Drying & Calcining-continuous Reduction Technology

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Journal of Wuhan University of Technology(Materials Science) 2011年第2期26卷 281-284页

作者：舒敬萍 Engineering training center Wuhan University of Technology

The effects of microwave sintering and conventional H2 sintering on the microstructure and properties of W-15Cu alloy using ultrafine W-15Cu composite powder fabricated by spray drying ＆ calcining-continuous reduction technology were investigated. In comparison to the conventional HE sintering processing, microwave sintering to W-15Cu can be achieved at lower sintering temperature and shorter sintering time. Furthermore, higher performances in microwave sintered compacts were obtained, but high microwave sintering temperature or long microwave sintering time could result in coarser microstructures.

关键词： W-15Cu ultrafine composite powder spray drying & calcining continuous reduction microwave sintering

A preliminary study on vegetation-erosion dynamics and its applications

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Science china Earth Sciences 2005年第5期48卷 689-700页

作者： WANG Zhaoyin 1,2 , WANG Guangqian 1 , LI Changzhi 1 & WANG Feixin 1 1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, china 2. International Research and training center on Erosion and Sedimentation, Beijing 100084, china 1. Department of Hydraulic Engineering Tsinghua University 100084 Beijing China 2. International Research and training center on Erosion and Sedimentation 100084 Beijing China

Vegetation-erosion dynamics is a new interdisciplinary science, studying the laws of evolution of watershed vegetation under the action of various ecological stresses. Introducing a qualitative expression of ecological stresses in this paper, the present authors establish the cou- pled differential equations for the vegetation-erosion process and derive a theoretical solution. The model is applied to the Anjiagou watershed on the Loess Pateau and the Xiaojiang water- shed and its sub-watersheds on the Yunnan Plateau. The calculated results agree well with the vegetation development processes. Abstracted from the differential equations the so-called vegetation-erosion chart is worked out, with which we can predict the development trend of vegetation under no human stresses. It is demonstrated that the erosion control is important for vegetation development and reforestation must be a long-term strategy. On the Yunnan Plateau with relatively high precipitation and temperature, vegetation can be greatly improved if erosion is controlled. On the dry and cold Loess Pateau suffering from high rate of soil erosion, however, vegetation can effectively control erosion but erosion reduction exhibits low effectiveness on vegetation development. Vegetation in the area is not stable and management is always needed to maintain the vegetation.

关键词： vegetation-erosion dynamics, human activities, coupled differential equations, erosion control, vigor ofvegetation.

Changes in the spatial scale of Beijing UHI and urban development

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Science china Earth Sciences 2005年第Z2期48卷 116-127页

作者： YU Shuqiu, BIAN Lingen & LIN Xuechun State Key Laboratory on Severe Weather, Chinese Academy of meteorological Sciences, Beijing 100081, china National Climate center, china meteorological administration, Beijing 100081, china State Key Laboratory on Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China National Climate center China Meteorological Administration Beijing 100081 China

The seasonal and interannual variations of Beijing urban heat island (UHI) are investigated in this paper using the temperature data from 1960 to 2000 at 20 meteorological stations in the Beijing region, and then the relationship between the intensity and spatial scale of UHI and Beijing urbanization indices is analyzed and discussed. Main conclusions are the followings. First, Beijing UHI shows obvious seasonal variations, and it is strongest in winter, next in spring and autumn, and least in summer. The seasonal variation of the UHI mainly occurs in the urban area. The UHI intensity at the center of Beijing is more than 0.8℃ in winter, and only 0.5℃ in summer. Second, the intensity of Beijing HUI exhibits a clear interannual warming trend with its mean growth rate (MGR) being 0.3.88℃/10 a. The MGR of HUI is largest in winter, next in spring and autumn, and least in summer, and the urban temperature increase makes a major contribution to the growth of HUI intensity. Third, since the Reform and Opening, the urbanization indices have grown several ten times or even one hundred times, the intensity of HUI has increased dramatically, and its spatial scale also expanded distinctively along with the expansion of urban architectural complexes. Fourth, the interannual variation of urbanization indices is very similar with that of HUI intensity, and their linear correlation coefficients are significant at a more than 0.001 confidence level.

关键词： Beijing region, temperature change, heat island effect, HUI spatial scale, human activities.

Geotechnical properties of oceanic sediments in polymetallic nodules belts

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Acta Oceanologica Sinica 2000年第2期19卷 57-67页

作者： Song Lianqing1 (1. center for Ocean Engineering Survey, Design and Research, State Oceanic administration,Hangzhou 3.0012, china) Ctr. for Ocean Engineering Survey State Oceanic Administration Hangzhou 310012 China

Geotechnical data obtained from the polymetallic nodules investigation in 1994, in combi nation with the historical data concerned, are analyses comprehensively to study sediment types, geotechnical properties, soil strength and so on, in order to provide bases for design and construction of engineering facilities and the equipments raquired for the polymetallic nodules mining in the future.

关键词： Polymetallic nodules geotechnical properties of sediments soil strength