Ziwang Deng

Nanjing University of Information Science & Technology, Nan-ching, Jiangsu Sheng, China

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Publications (2)0.2 Total impact

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    ABSTRACT: Using the 1961-2001 rainfall datasets from 25 typical stations in Fujian Province treated by means of Empirical Orthogonal Function (EOF), Fast Fourier Function (FFT), Continuous Wavelet Transform (CWT) and Orthogonal Wavelet Transform (OWT) study is made of sequences of flood/drought indices (Z index) in different seasons. Evidence suggests that 1) the regional flood/drought events have significant 2~3 year periods in 1965-1975 and the 1990s; 2) rainfall amount in the south opposite to that in the north shows pronounced 1- and 3~ 4-yearly periods after the mid 1980s; 3) quantitatively, precipitation occurs in the west to middle in an opposite way to the other parts of the province, with noticeable 1~2 yearly periods in 1985 - 1998, and more appreciable 9~13-yearly periods after the 1980s; 4) within the study period (1961-2001) the drought trend is more apparent in the south (east) than in the north (west), particularly in the 1990s; 5) the regional climate is relatively wetter (drier) in the 1960s and 1980s (1970s and 1990s).
    Proceedings of SPIE - The International Society for Optical Engineering 09/2006; DOI:10.1117/12.676866 · 0.20 Impact Factor
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    ABSTRACT: Based on 1961-2003 NCEP/NCAR reanalysis treated with EOF, wavelet and cross wavelet techniques we investigate different space patterns of July-September precipitation over Fujian in relation to summer monsoon over the NW Pacific and Indian Ocean at a range of time scales. Results show that 1) the uniform rainfall all over the province and opposite distribution of precipitation in the SE to the NW part are the dominant modes, 2) the NW Pacific summer monsoon exerts steadier impacts on rainfall in the former case, manifested dominantly in the interannual variation especially after the mid 1980s, depending on the strong (weak) monsoon for excessive (insufficient) precipitation, with the response center in the eastern seaboard of the province whereas the Indian Ocean monsoon has rather stable influence on rainfall differing in amount between SE and NW Fujian, mainly in the interdecadal variation, and it also exerts remarkable effects on the interannual variation subsequent to the mid 1980s, relying on the intense (weak) monsoon for more (less) precipitation in the SE and less (more) in the NW part in this season. It follows that the NW Pacific (Indian) monsoon has its effect on the rainfall amount (space distribution) during July to September, and 3) with the strong monsoons over the two oceans the difference in rainfall between SE and NW Fujian is increased and in the opposite case precipitation is lower over much of the province, and when the monsoons are contrary in intensity the departure field shows a complicated pattern, manifesting pronounced locality.
    IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2006, July 31 - August 4, 2006, Denver, Colorado, USA, Proceedings; 01/2006