Year-to-year variations in summer drawdown of northern
hemisphere atmospheric carbon dioxide (CO2) are compared with
corresponding year-to-year variations in sea- level pressure (SLP), surface air
temperature and the productivity of land vegetation as inferred from the
satellite-derived normalized difference vegetation index (NDVI). Annual values
of CO2 drawdown for the years 1980-2000 are estimated from smoothed
time series derived directly from individual flask samples at the 9 northern
hemisphere monitoring stations with the most continuous records. The leading
principal component of the 9 standardized drawdown time series, in which all
stations exhibit positive loadings, is used to represent the hemispheric signal
in the CO2 drawdown. Linear regression analysis is used to infer the
spatial patterns of anomalies in sea level pressure, surface air temperature
and the NDVI observed during various seasons of years in which the drawdown is
anomalously strong.
Author: J.L. Russell, E. Shevliakova, S. Malyshev, and J.M. Wallace (jrussell at Princeton dot edu)
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