- Related Research Areas
This proposal falls under the research focus area, "Use of satellite and field campaign data to study precipitation and microphysical processes, particularly for mixed phase and frozen precipitation". Central to our proposal is the dual-wavelength, dual-polarized CP2 facility located near Brisbane, AU. This radar is unique in that one can directly measure the specific attenuation (k) at 9.4 GHz without any assumptions, and scale it to 13.8 GHz (as well as to 35 GHz). Along with the S-band (3 GHz) dual-polarized radar data, the accurate retrieval of the DSD parameters (such as the median volume diameter and normalized intercept parameter) and rain rate (R) is possible. Because of the large coverage area of the radar which operates 24/7, the PDFs of the DSD parameters can be derived by rain type and regime. In the mixed phase and frozen precipitation region of deep convective storms, it is now possible, without assumptions, to directly measure the statistics of the coefficient (a) and exponent (b) in the k-Z power laws, of importance to the vertical structure model used in PR 2A25 algorithms and in future GPM DPR algorithms. We will continue to perform detailed analysis of coordinated CP2 radar and 2A25 PR algorithms during TRMM overpasses in the vicinity of Brisbane which covers hilly terrain to the west and coastal (over sea) areas to the east. In addition, collaboration with Prof. Kummerow's group will allow comparisons with their optimal estimation scheme using combined PR/TMI for coastal (over sea) events, and with their radar-only model for land events. These latter algorithms are being developed within the framework of the Combined Algorithm Team so our proposed collaboration will also be better connected with the GPM algorithm development effort. We will also be in a good position to validate Version 7 of the 2A25 algorithm over both land and sea using the CP2 radar. The proposed study is important to understand why there are persistent regional and regime-dependent biases in rainfall between 2A25 and 2A12, especially in deep convection over land. Our specific objectives are as follows: (i) Provide PDFs of DSD parameters retrieved from the CP2 radar to satellite algorithm developers who need to constrain the adjustment of these parameters (given some apriori knowledge about the regime) (ii) Derive the statistics of the parameters 'a' and 'b' in the k-Z power law from CP2 radar data in the mixed phase layer, stratified according to different precipitation regimes, which is of importance for current PR and future GPM algorithm development (iii) Perform detailed comparisons of TRMM overpass data with CP2 radar observations and the combined PR/TMI optimal estimation scheme being developed by Prof. Kummerow's group (iv) Use high resolution CP2 radar observations to determine if the spectral bin microphysical schemes used in CRMs can better represent the vertical structure of the radar variables, particularly in the mixed phase and frozen precipitation, as opposed to using bulk microphysical schemes. A three-year effort is proposed with our principal collaborators being Prof. Kummerow of Colorado State University and Dr. Peter May of the Center for Australian Weather and Climate Research in Melbourne, Australia. The latter Center has a group led by Dr. May who are part of the GV-team related activities in Brisbane and Darwin. Many of the technique development efforts relevant to achieving the objectives described in this Project Summary will be highlighted with examples in the main text of this proposal.
Project PI: V.N. Bringi/Colorado State University
Dept. of ECE Colorado State University Fort Collins, CO 80523-1373
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