Interannual variations in satellite-sensed vegetation index data from 1981 to 1991

摘要: Normalized difference vegetation index (NDVI) data processed from measurements of advanced very high resolution radiometers (AVHRR) onboard the afternoon-viewing NOAA series satellites (NOAA 7, 9, and 11) were analyzed for spatial temporal patterns comparable to those observed in atmospheric CO2, near-surface air temperature, sea surface temperature (SST) during 1981–1991 time period. Two global sets NDVI consistency: (1) land segment joint NOAA/NASA Earth Observing System AVHRR Pathfinder set (2) Global Inventory Monitoring Modeling Studies set. The impact SST events was found be confined mostly tropical latitudes but generally dominant enough manifest anomaly. anomalies at north 45°N exhibit an increasing trend. This linear trend corresponds a 10% increase seasonal amplitude over 9 year period (1981–1990). During same period, annual record atmosphere CO2 measured Point Barrow, Alaska, reported have increased by about 14%. between years especially consistent through spring early summer periods. When this translated into advance timing green-up, measure (8±3 days) similar recently published estimate 7 days midpoint drawdown Alaska. geographical distribution activity with springtime warming decline snow cover extent northern hemisphere area.