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Effects of 4DVAR with multifold observed data on the typhoon track forecast

chinese Science Bulletin 2003年第S2期48卷 93-98页

作者： wang yunfeng,{1.,{{2. institute of atmospheric physics, chinese academy of Sciences. beijing 10002., china: 2. national satellite meteorological center, beijing 100081. china chinese Acad Sci Inst Atmospher Phys LASG Beijing 100029 Peoples R China Natl satellite Meteorol Ctr Beijing 100081 Peoples R China

Effects of 4-dimension variational data assimi-lation (4DVAR) with multifold observed data on the typhoontrack forecast are studied, by using the MM5V3 model, theRTTOVS-5 model and their adjoint models. The data usedfor assimilation include large-scale background fields data,bogus data, cloud-derived wind data, satellite inverse data,and high resolution infrared radiation sounder data (HIRS).There are 5 typhoon cases are used to perform the numericalexperiments and assimilation experiments. The numericalresults show that with 4DVAR the initial fields can be greatlyimproved and the initial typhoon structure can be clearlydescribed.

关键词： multifold observed data 4DVAR typhoon track. DOI: 1..1.60/03wd0456

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Long-term analysis of clear nights using satellite data considering astronomical sites in western {1.

引用

Research in Astronomy and Astrophysics 2020年第6期20卷 96-108页

作者： Zi-Huang Cao Li-Yong Liu Yong-Heng Zhao Lu Feng Hugh RAJones Huang Shen Jin-Xin Hao Yan-Jie Xue Yong-Qiang Yao Jing Xu Ali Esamdin Zhao-Xiang Qi Jian-Rong Shi Jian Li Yuan Tian Zheng wang Tai-Sheng Yan Xia wang Jian-Ping Xiong Si-Cheng Yu Jun-Bo Zhang Zhi-Xia Shen Yun-Ying Jiang Jia Yin Guang-Xin Pu Peng Wei Chun-Hai Bai Guo-Jie Feng Lu {2. Teng-Fei Song Jian-Feng wang Jian-Feng Tian Xian-Qun Zeng Zhi-gang Hou Shi-Long Liao Zhi-Song Cao Dong-Wei Fan Yun-Fei Xu Chang-Hua Li Yi-Han Tao national Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of chinese {1. of Sciences Beijing 100049China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Centre for Astrophysics University of HertfordshireHatfieldUK School of Journalism.Communication University of china Beijing 100024China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Yunnan Observatories Chinese Academy of SciencesKunming 650216China

A large ground-based optical/infrared telescope is being planned for a world-class astronomical site in *** cloud-free night percentage is the primary {1. consideration for evaluating candidate *** data from GMS and NOAA {2.s and the MODIS instrument were utilized in this research,covering the period from 1.96 to *** data analysis benefits from overlapping results from different independent teams as well as a uniform analysis of selected sites using GMS+NOAA *** significant ground-based monitoring is needed to validate these findings,we identify three different geographical regions with a high percentage of cloud-free conditions(~83%on average),which is slightly lower than at mauna Kea and Cerro Armazones(~85%on average)and were chosen for the large inter{2..projects TMT and ELT *** study finds evidence that cloud distributions and the seasonal changes affected by the prevailing westerly winds and summer monsoons reduce the cloud cover in areas influenced by the *** is consistent with the expectations from climate change models and is suggestive that most of the identified sites will have reduced cloud cover in the future.

关键词： methods statistical-site testing-atmospheric effects-MODIS

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