Relations between AVHRR NDVI and climate factors in Northern Tibet in recent 20 years
Relations between AVHRR NDVI and climate factors in Northern Tibet in recent 20 years
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作者：
Lu Zhi
利用1981—2001年NOAA/AVHRR 10天综合NDVI数据和6个站点的逐日气象资料，分析了NDVI的年际变化和年际变化以及NDVI与8个气候因子的关系。主要结果表明，影响NDVI年际变化最重要的气候因子是温度，NDVI与水汽压的关系比水汽压与NDVI的关系更显着。 NDVI与降水量、NDVI与日照时数呈负相关。NDVI与风速呈负相关，且无时滞。NDVI与日照时数的对应关系有0~10天的明显滞后，而NDVI与潜在蒸散量、温度、水汽压和其他变量的滞后则在20~40天。 影响NDVI年际变化最重要的气候因素是潜在蒸散量。
Using NOAA/AVHRR 10-day composite NDVI data and daily meteorological data at six stations from 1981 to 2001,the annual and interannual variations of NDVI and the relations between NDVI and eight climate factors were analyzed.The main results showed that the most important climate factor affecting the annual variations of NDVI was temperature.The relation between NDVI and water vapour pressure was more marked than that between NDVI and precipitation and the relation between NDVI and sunshine duration was negative.The correspondence between NDVI and wind velocity was negative with no time lag.The correspondence between NDVI and sunshine duration had a marked lag between 0 and 10 days,while the time lags were in the range from 20 to 40 days between NDVI and other variables including potential evapotranspiration,temperature,water vapour pressure and precipitation.The most important climate factor affecting the interannual changes of NDVI was potential evapotranspiration.