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Journal of Tropical Oceanography ›› 2011, Vol. 30 ›› Issue (4): 44-50.doi: 10.11978/j.issn.1009-5470.2011.04.044cstr: 32234.14.j.issn.1009-5470.2011.04.044

• Marine meteorology • Previous Articles     Next Articles

Interannual variation of vegetation and precipitation in Pearl River Basin during 1982−1999

WANG Yin-xia1,2,3,4, SHI Ping1,2, ZENG Li-li2, XIE Qiang2, WANG Dong-xiao2   

  1. 1. Yantai Institute of Coastal Zone Research, CAS, Yantai  264003,  China; 2.  State Key Laboratory of Tropical  Oceanography
    (South China Sea Institute of Oceanology, CAS), Guangzhou 510301, China; 3. Graduate University of CAS, Beijing 100049, China;
    4. South China Sea Marine Engineering and Environment Institute of State Oceanic Administration, Guangzhou, Guangzhou, 510300,
    China  
  • Received:2010-04-10 Revised:2010-05-17 Online:2011-09-05 Published:2011-09-08

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Abstract:

Based on the monthly normalized difference vegetation index (NDVI) and precipitation data in the Pearl River Ba-
sin from 1982 to 1999, the relationship between NDVI and precipitation anomaly on the annual and interannual time scales are
analyzed using empirical orthogonal function (EOF) method. Correlation coefficients between NDVI, precipitation, and other
climatic factors are also analyzed. There is a good spatial coincidence between the variation of NDVI and that of precipitation
anomaly in terms of annual variability, with NDVI lags one month. The interannual anomalies of NDVI and precipitation have
obvious difference in their spatial distributions. Positive correlation is found in the west of the Pearl River Basin, while nega-
tive correlation is found in the east. The relationships between NDVI and climate factors are different in different seasons and
different domains. The correlation coefficient between NDVI and precipitation is negative in the east and positive in the west.
The relationship between NDVI and temperature is positive in the east and not significant in the west; same for the relation-
ship between NDVI and solar radiation. In summer, the NDVI and precipitation have negative relationship, which reverses in
spring and fall.

Key words: Pearl River Basin, normalized difference vegetation index (NDVI), precipitation, interannual variability