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The Statistical Analysis and Dynamics Study on the Relation between High Jet and Sandstorm

Author: ChengHaiXia
Tutor: DingZhiYing
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Sandstorm The jet stream Dual Rapids Statistics Dynamic Analysis
CLC: P425.55
Type: Master's thesis
Year: 2006
Downloads: 126
Quote: 1
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Abstract


Firstly, from 2000 to 2004 five -year relationship between the jet stream and storms were statistically and use MM5 model for April 2001 8 ~ 9 strong sandstorm during a numerical simulation and diagnostic analysis . Statistical results show that : with the jet stream is always accompanied by sandstorms occur ; rapids caused by dust storms can be divided into two categories: single -and double- jet jet type ; wide range of strong sandstorm accompanied with a double jet appeared ; sandstorm in southwest wind , northwest wind jet left and right rear . Statistics also found that there are some rapids rapids double mutation, sandstorms Rapids mutation on the occurrence and development has an important role . Simulations found that: In April 2001 8 ~ 9 sandstorm generation , development process, high-level westerly winds produced strong momentum downstream , low-level southerly and northerly component to jointly promote the development of the sandstorm , senior South wind has played a role in inhibiting the development of dust storms . North and south two jet stream is caused by the combined effect of the main reasons the second sandstorm , North Branch Rapids has a direct role in the South Branch of rapids have an indirect effect . Whether up or downdrafts are likely to generate dust storms, low-level convergence , upper-level divergence ( rising motion ) can cause suction effect caused by the formation of near-surface winds and sandstorms ; strong downdrafts can cause downstream momentum in favor Sandstorm generation. In the high-altitude jet stream moving process , the non- geostrophic wind component u-u_g determines two north-south direction of rotation jet axis . Two large values ??MPV1 positive vorticity region and the north and south two rapids have a good correspondence between the two , respectively, with two jet toward large values ??MPV1 positive vorticity contours dense area towards the south side of the same , dust storms occur in front of the high-latitude frontal eddy near the large gradient values ??and negative vorticity center MPV1 north . Sandstorm area in front , MPV1 and MPV2 opposite sign , and the MPV lt; 0, explain in this area, there troposphere symmetric instability exists. Symmetric instability is conducive to high winds caused by the ground , thus contributing to the formation and development of sandstorms . Analysis of the vertical structure of vorticity , you can know : potential vorticity can well reflect the positive area and the cyclonic circulation of cold air activities , potential vorticity baroclinic term MPV2 with vertical circulation have a certain relationship .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Meteorological elements,atmospheric phenomenon > Wind > Special region of the wind > Sandstorms , dust storms
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