Dissertation > Excellent graduate degree dissertation topics show

Xi'an atmospheric CO 2 spatial and temporal distribution of

Author: GuoYi
Tutor: ZhaoJingBo
School: Shaanxi Normal University
Course: Environmental Science
Keywords: Atmospheric carbon dioxide Diurnal variation Weather conditions Vertical distribution Of working days with Shuangxiu days change City
CLC: X13
Type: Master's thesis
Year: 2011
Downloads: 114
Quote: 0
Read: Download Dissertation

Abstract


Global warming is the most serious global environmental problems facing humanity, people are most concerned about environmental issues, now the core of climate warming is the greenhouse gas CO2 emissions on greenhouse gases has become the current atmospheric sciences and environmental Lee School one of the most active issues in the study. Study of the atmospheric CO2 concentration, helps people to understand, predict and improve the process of change of the Earth's climate. The study of urban atmospheric CO2 sources and sinks can lay the theoretical foundation for the construction of low-carbon cities, energy conservation reference value. Select the four monitoring points of difference in Xi'an, infrared carbon dioxide monitor atmospheric CO2 concentration in the autumn for 4 days of continuous monitoring, and acquisition synchronous meteorological data and other relevant data, observations diurnal variation, work Day and Holiday differentiation, changes in CO2 concentrations and meteorological parameters, geographical differences of each monitoring site, near-surface layer of atmospheric CO2 vertical distribution characteristics, resolve Xi'an pattern of sources and sinks of atmospheric CO2, and to study the changes in the atmospheric CO2 concentration and meteorological the relationship between factors, the following conclusions and understanding: (1) bimodal modal analysis presented by changes in CO2 concentration in the atmosphere of each monitoring site in Xi'an realize that solar radiation cause of Plant Physiology and weather conditions day and night change and other natural The factors that determine the diurnal variation of Xi'an Fall C02 Concentration. Short crest of the atmospheric CO2 concentration in the urban area in the morning 6-7, 8-11 morning and night, 19 to 23, with the city caused by human activity, is caused by the point source and line source emissions. The weather atmospheric pressure lower cloudy or cloudy atmospheric CO2 concentration of high atmospheric pressure, the lower atmospheric CO2 concentration. Wind speed has diluted the role of atmospheric CO2 in the long calm wind weather, atmospheric CO2 concentration increase accumulate. (2) working days and holidays atmospheric CO2 concentration there are obvious differences, the National Day holiday in the factory to stop production, reduce coal-fired CO2 emissions, so that the atmospheric CO2 concentration decreased 5-10ppm. This suggests that the plant coal emissions Xi'an sources of atmospheric CO2. (3) regional comparative analysis of atmospheric CO2 concentration for each monitoring site found that daytime farmland and green plants are CO2 sinks, and at night it is the only source of CO2; while the city during the day mainly as a source of CO2. The two urban atmospheric C02 concentration curve characteristics crest, its the Ribbon Source Department of intensity variations and weather conditions combined effects of where the results of the performance of human activities, the role of law. (4) vertical distribution of near-surface layer CO2 concentration in the urban area and its diurnal variation studies have shown that the total atmospheric CO2 concentration value decreases with increasing altitude, the surface of the city is the direct source of atmospheric CO2 in Xi'an area; during the day , vertical distribution of atmospheric CO2 concentration increases with height lower, compared with little change in the concentration of atmospheric CO2 in the height of the night, which is caused by changes in surface and atmospheric physical properties caused by the difference in atmospheric stability; early in the morning and evening, each observation point of the vertical distribution of atmospheric C02 concentrations are undulating, which is the underlying surface source intensity increases due to the instantaneous point source and line source emissions, and the two periods neutral stratification of the atmosphere, The results of both effects. (5) 2 height of the farmland monitoring point observations contrast analysis showed that farmland atmosphere 20cm from the ground at the height of the atmospheric CO2 concentration is less than 100cm height, night On the contrary, such a change in the distribution is due to 20cm height from the ground at the atmosphere by soil respiration caused.

Related Dissertations

  1. Research on Developmental Strategies of Commercial Fitness Clubs in Nanning Based on SWOT Analysis,G80-05
  2. The City Image Analysis and Research of the Jilin City,TU984
  3. Research on the Historic Area Conservasion for Jilin City,TU984.114
  4. The Conservation of Xingcheng Ancient City,TU984.114
  5. Harbin City Space Environment Visual Guidance System,TU998.9
  6. Study on Restoration of the City Gate of Shangjing in Parhae,TU-05
  7. Women and Urban Duo,I207.42
  8. Research on the Traffic Problem of Historic Block in the City,TU984.191
  9. Research on the Soil Environmental Function Zoning,X321
  10. The Research of Land-Use Optimization Approach Based on Non-Point Source Pollution Controlled,X24
  11. The Research of Perfect Urban and Rural Social Assistance System,D632.1
  12. Educational status of the early post - contribution and labor market supply and demand relationship,G40
  13. Study on Photosynthetic Characteristics of Peach Based on Heterosis of Assimilation Capacity,S662.1
  14. Research on the Status and Stratage in New Socialist Countryside Construction in Wenzhou,F327
  15. Study on Vascular Plant Diversity and Their Dispersal Mechanisms on the Vertical Surfaces of nanjing Ming Dynasty City Wall,Q948.1
  16. Ecological Function of Cassava-Peanut Intercropping in Small Red Soil Watershed,S533
  17. Xinxiang City high school sports large recess Survey and Policy Research,G633.96
  18. Urban and rural women high-risk human papillomavirus infection status and epidemiological studies of risk factors,R737.33
  19. Middle School Physical Education and Health Curriculum Development An Empirical Study,G633.96
  20. A Study on Equal Compulsory Education Right between Civics and Villagers,G522.3
  21. Research of Chinese City Commercial Banks’ Cost Efficiency Based on Data Envelopment Analysis,F224

CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry
© 2012 www.DissertationTopic.Net  Mobile