Dissertation > Excellent graduate degree dissertation topics show

Effect of the Transported Dust Aerosols on Cloud and Precipitation: A Numerical Study

Author: ChenLi
Tutor: YinYan；YangJun
School: Nanjing University of Information Engineering
Course: Atmospheric Physics and Atmospheric Environment
Keywords: Dust aerosol CCN IN Heating effect Clouds and precipitation
CLC: P426.5
Type: Master's thesis
Year: 2007
Downloads: 151
Quote: 1
Read: Download Dissertation

Abstract


The study showed that the dust aerosol by solar radiation absorption and scattering affect the earth-atmosphere system of the radiation balance, and also can be used as cloud condensation nuclear and ice nuclei change cloud and precipitation development, global change cloud and precipitation distribution. Tranche cloud dynamics model to better understand the impact of dust on atmospheric wet process, and discuss the possible impact of a the dust aerosol transmission over macro and micro characteristics Cheng Duiyun and precipitation development. First, the use of the Helan Mountain area aerosol observations, to simulate the weather conditions of different levels of dust aerosol size distribution of cloud and precipitation. The results: increased megakaryocyte concentration caused by the process of blowing sand and dust storms to promote the precipitation development, the early appearance of precipitation, a substantial increase in the warm cloud and cold cloud precipitation; dust weather process the increase of the concentration of ice nuclei increased within the cloud ice phase particle concentration, reducing the effective radius of the ice particles and cold cloud precipitation efficiency, so that the cloud memory remain a large number of ice cloud optical thickness and albedo been enhanced. Secondly, the dust particles, resulting in the remote transport process with atmospheric pollutants interaction soluble contaminants (such as sulfates and nitrates) in the surface of the formation and deposition of dust particles, changing the optical properties of the dust particles and its capacity as cloud condensation nuclei and ice nuclei. This work explores the dust particles in the atmospheric aerosol background conditions affect the formation of clouds and precipitation, the results showed that: the only mainland or man-made pollution is more serious cloud of dust particles contain a certain percentage of soluble matter in favor of large the cloud droplets produce, improve cloud droplets between touch and efficiency so as to promote the development of warm cloud precipitation development and sleet, ice-phase precipitation particles, ice-phase precipitation particles appear time in advance, and to increase the surface precipitation. Finally, the latest remote sensing data indicate significant impact of dust on the solar-terrestrial radiation absorption caused by atmospheric heating effects on cloud microscopic characteristics and distribution. In this paper, the results of dust heating rate distribution of satellite remote sensing and cloud model to assess the of dust heating effect on the impact of cloud and precipitation theory to explain this result, and focus on the height of the maximum concentration of the dust, dust thickness and heating intensity on the formation of cloud particles and precipitation. The results show that: the transmission when the dust concentration in high temperature (low) at -5 ℃ area, the heating effect of the sand and dust suppression (in favor of) the development of clouds and precipitation, and transport layer absorbent particles Vietnam , the height of the transport layer is lower, the greater the thickness, the stronger the inhibition of the formation and development of the cloud.

Related Dissertations

  1. Numerical Simulation and Observation of a Mineral Dust Processing Over Lanzhou,P445.4
  2. A Study on the Oceanic Convection Structure and TRMM Retrieved Data Analyses over the SCSMEX,P732
  3. Theoretical and Experimental Study on Gaseous Flow and Heat Transfer in Microchannels,TK124
  4. The physical effects of the SOI device simulation and its total dose radiation reinforcement technology research,TN304
  5. Study of Novel Structural SOI Materials and Device Physics,TN304.12
  6. Study of Novel Structural SOI Materials (SGOI、SODI)& Related Technology,TN304
  7. Numerical Study on Influences of Orographic Dynamics on Clouds and Precipitation Physics during a Heavy Rainfall Process in North China,P458.121.1
  8. Simulation of Aerosol Radiative Effect and Its Meteorological Field Response Using CAML Lidar and Aethalometer Measurements,X513
  9. The High Temperature Application Research of Deep Sub Micron SOI CMOS Circuits,TN386
  10. The Analysis on the Crack Arresting by Using Electromagnetic Heating Effect,TB303
  11. A Study on the Modeling of AlGaN/GaN High Electron Mobility Transistors,TN321
  12. Research of Patterned SOI Technology,TN405
  13. Atmospheric Nitrogen Pollution Chemistry in Qingdao and Its Main Influence Factors’ Simulation,X51
  14. Studies of SOI Materials with New Buried Insulator,TN402
  15. Radiative Forcing Effect of Dust Aerosol over Northwestern China,X513
  16. Studies of Some Key Issues on Transport Phenomena in Electrical Field-Driven Microfluidic Chip,TN492
  17. Comprehensive Observation of Dust Aerosol Over Loess Plateau,P425.55
  18. Characteristics, Source, Long-range Transport of Dust Aerosol over the Central Asia and Its Potential Effect on Global Change,X513
  19. The Study of the Nonlinear Conduction Behavior of High-density Polyethylene/Graphite Nanosheets Conducting Composites under Electric Field,TB332
  20. Numerical Study of Modulated Electroosmosis and Joule Heating Effects in Microfluidics,O361.4

CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Meteorological elements,atmospheric phenomenon > Water vapor,condensation,and precipitation > Cloud
© 2012 www.DissertationTopic.Net  Mobile