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High-probability grants
According to our matching algorithm, Qin Xu is the likely recipient of the following grants.
Years |
Recipients |
Code |
Title / Keywords |
Matching score |
1987 — 1990 |
Xu, Qin |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Theoretical Studies On Baroclinic Waves and Frontogenesis Inthe Presence of Small Moist Symmetric Stability @ University of Oklahoma Norman Campus
The objective of this project is to investigate the development of nonlinear baroclinic waves and three-dimensional frontogenesis in situations where a basic jet and a conditionally moistured zone coexist. The semi-Lagrangian coordinate transformation and the finite element method will be used to solve the three-dimensional moist semi-geostrophic equations. The results are expected to shed light on the formation of stratiform precipitation and frontal rainbands, and their effects on the evolution of the frontal zone.
|
0.939 |
1989 — 1993 |
Xu, Qin |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Theories and Methods For Diagnoses of Moist Frontal Circulations @ University of Oklahoma Norman Campus
While many of the factors that govern general weather patterns are fairly well understood, the physical phenomena that control localized severe events, such as extremely heavy snowfalls or flash floods, are still somewhat of a mystery. These mesoscale phenomena, as they are called by meteorologist, currently are the subject of intense investigations within the meteorological community. The Principal Investigator will undertake a theoretical and numerical modeling investigation of two mesoscale phenomena (frontogenetical forcing and moist symmetric stability). These features may be responsible in some cases for the formation of intense rain/snow bands that often form in the vicinity of meteorological fronts. Results of this study should lead to better fundamental understanding of the physics of banded precipitation structures and eventually to improved short range precipitation predictions.//
|
0.939 |
1995 — 1999 |
Lamb, Peter (co-PI) [⬀] Xu, Qin |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Balanced and Unbalanced Mesoscale Dynamics @ University of Oklahoma Norman Campus
9417304 Xu Large scale atmospheric systems such as low and high pressure centers are typically governed by a balance of pressure gradient and coriolis forces and are, therefore, termed balanced flow. For small-scale phenomena such as thunderstorms, this balance typically does not hold and these weather features are referred to as being governed by unbalanced flows. The Principal Investigator will perform a numerical and theoretical study of these two flow types. Density current features, squall lines and mesoscale vortices are important mesoscale weather producing systems and often persist over timescales longer than individual convective storms. These long-lived mesoscale structures may involve different types of interactions between the balanced large scale flows and more transient small scale motions. Studying the related balanced dynamics versus unbalanced dynamics may lead to a new understanding of why the concerned structure is long-lived. The balanced (or unbalanced transient) flow component in a mesoscale convective system is likely to be controlled deterministically (or stochastically) by the large scale environmental flow. Identifying the balanced and unbalanced flow components in mesoscale convective systems may provide useful information for improving or developing cloud parameterization schemes for numerical weather or climate prediction models. ***
|
0.939 |
2000 — 2004 |
Xu, Qin |
N/AActivity Code Description: No activity code was retrieved: click on the grant title for more information |
Three-Dimensional Modal and Nonmodal Structures in Frontal Rainbands @ University of Oklahoma Norman Campus
It has been observed that mid-latitude precipitation is commonly associated with frontal systems and frontal precipitation is organized into bands, which exhibit three-dimensional substructures. Prediction of fronts and associated precipitation on the synoptic scale has steadily improved over the past decade; however, prediction of frontal substructures and associated precipitation on the mesoscale has experienced less success.
The goal of this research is to explore new instability mechanisms that will provide possible explanations for some observed three-dimensional substructures, including severe storm elements, embedded in frontal rainbands. As one of the possible dynamic mechanisms, symmetric instability (SI) and conditional SI have been shown to have many attractive features in interpreting the gross structures of some observed frontal rainbands. However, the often-observed three-dimensional substructures in frontal rainbands are beyond the description of current SI theories. Recent research by the Principal Investigator (PI) suggests that nonlinear SI circulations are unstable in three dimensions and the related secondary unstable modes resemble some observed mesoscale substructures. The results obtained so far are still very preliminary but shed light on a number of important issues, which need further investigation.
Successful completion of this research will advance theoretical understanding of precipitation systems and potentially lead to better forecasts.
|
0.939 |