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RISS 인기검색어
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- 저자 : Ziad Haddad (검색결과 2 건)
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Advances in Precipitation Measurements and Sciences
신동빈,Ziad Haddad,Ralph Ferraro 한국기상학회 2020 Asia-Pacific Journal of Atmospheric Sciences Vol.56 No.4
The International Precipitation Working Group (IPWG) is one of the science groups to improve satellite system utilization within the Coordination Group for Meteorological Satellites (CGMS) sponsored by the World Meteorological Organization (WMO). IPWG is interested in quantitative precipitation measurements from operational and research perspectives. Its endeavor is to foster the development of better precipitation measurements, the improvement of scientific understanding of the related processes, and the development of international partnerships. IPWGorganizes the series ofworkshops every 2-years to exchange recent scientific issues, gather opinions and recommendations on new and ongoing satellite missions for precipitation and specifically advice CGMS. The 9th workshop of IPWGwas held in November 2018 in Yonsei University, Seoul, Korea. The workshop consisted of major topics including new and ongoing satellite programs, retrieval algorithms, validations of various precipitation products, precipitation science in meteorology, hydrology, oceanography, climate, emerging applications such as health, flood and drought monitoring, and risk assessments. The workshop also featured three interactive sessions, during which the attendees were invited to participate in discussing and making plans to address important issues for IPWG. Two interactive sessions dealt with the IPWG-the Global Water and Energy Experiment (GEWEX) Data and Assessment Panel (GDAP) assessment of global precipitation products. One interactive session was devoted to “looming challenges” to the production of global satellite precipitation estimates. Intensive meetings of the working groups on Research, Validation, Data assimilation and scattering, and Applications followed. In parallel to the workshop, a satellite data training event was held. The separate training activity focused on new and emerging satellite technologies, sensors, and precipitation datasets. The workshop included 69 oral presentations and 47 posters to share precipitation related sciences and applications to the scientific community. As a part of the workshop efforts, the special issue “Advances in Precipitation Measurements and Sciences” is published. We would like to thank all the participants to the 9th workshop of IPWG and for the contributions to this special issue.
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Optimization of Cloud-Radiation Databases for Passive Microwave Precipitation Retrievals over Ocean
Seo, Eun-Kyoung,Yang, Sung-Dae,Grecu, Mircea,Ryu, Geun-Hyeok,Liu, Guosheng,Hristova-Veleva, Svetla,Noh, Yoo-Jeong,Haddad, Ziad,Shin, Jinho AMERICAN METEOROLOGICAL SOCIETY 2016 Journal of atmospheric and oceanic technology Vol.33 No.8
<P>Using Tropical Rainfall Measuring Mission (TRMM) observations from storms collected over the oceans surrounding East Asia, during summer, a method of creating physically consistent cloud-radiation databases to support satellite radiometer retrievals is introduced. In this method, vertical profiles of numerical model simulated cloud and precipitation fields are optimized against TRMM radar and radiometer observations using a hybrid empirical orthogonal function (EOF)-one-dimensional variational (1DVAR) approach.The optimization is based on comparing simulated to observed radar reflectivity profiles and the corresponding passive microwave observations at the frequencies of the TRMM Microwave Imager (TMI) instrument. To minimize the discrepancies between the actual and the synthetic observations, the simulated cloud and precipitation profiles are optimized by adjusting the contents of the hydrometeors. To reduce the dimension of the hydrometeor content profiles in the optimization, multivariate relations among hydrometeor species are used. After applying the optimization method to modify the simulated clouds, the optimized cloud-radiation database has a joint distribution of reflectivity and associated brightness temperatures that is considerably closer to that observed by TRMM PR and TMI, especially at 85 GHz. This implies that the EOF-1DVAR approach can generate profiles with realistic distributions of frozen hydrometeors, such as snow and graupel. This approach may be similarly adapted to operate with the variety and capabilities of the passive microwave radiometers that compose the Global Precipitation Measurement (GPM) constellation. Furthermore, it can be extended to other oceanic regions and seasons.</P>
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