Effect of climate and CO2 changes on the greening of the Northern Hemisphere over the past two decades

Study of the effect of current climate changes on vegetation growth, and their spatial patterns improves our understanding of the interactions between terrestrial ecosystems and climatic systems. This paper explores the spatial patterns of vegetation growth responding to climate variability over Northern Hemisphere (>25°N) from 1980 to 2000 using a mechanistic terrestrial carbon model. The results indicate that changes in climate and atmospheric CO2 likely function as dominant controllers for the greening trend during the study period. At the continental scale, atmospheric CO2, temperature, and precipitation account for 49%, 31%, and 13% of the increase in growing season LAI, respectively, but their relative role is not constant across the study area. The increase in vegetation activity in most of Siberia is associated with warming, while that in central North America is primarily explained by the precipitation change. The model simulation also suggests that the regression slope of LAI to temperature increases with soil moisture, but decreases with temperature. This implies that the contribution of rising temperature to the current enhanced greening trend will weaken or even disappear under continued global warming. We also find that the effects of both vegetation precipitation use efficiency and atmospheric CO2 fertilization on the greening trend increase as soil moisture becomes limiting.

[1]  G. Collatz,et al.  Coupled Photosynthesis-Stomatal Conductance Model for Leaves of C4 Plants , 1992 .

[2]  Ranga B. Myneni,et al.  Estimation of global leaf area index and absorbed par using radiative transfer models , 1997, IEEE Trans. Geosci. Remote. Sens..

[3]  C. Tucker,et al.  Increased plant growth in the northern high latitudes from 1981 to 1991 , 1997, Nature.

[4]  Stephen D. Prince,et al.  Evidence from rain‐use efficiencies does not indicate extensive Sahelian desertification , 1998 .

[5]  P. Friedlingstein,et al.  Toward an allocation scheme for global terrestrial carbon models , 1999 .

[6]  C. Tucker,et al.  Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999 , 2001 .

[7]  Y. Yamaguchi,et al.  Global correlation analysis for NDVI and climatic variables and NDVI trends: 1982-1990 , 2002 .

[8]  J. Randerson,et al.  Trends in North American net primary productivity derived from satellite observations, 1982–1998 , 2002 .

[9]  Jarl Ahlbeck,et al.  Comment on ``Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999'' by L. Zhou et al. , 2002 .

[10]  C. Tucker,et al.  Reply to Comment on “Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981–1999” by J. R. Ahlbeck , 2002 .

[11]  Peter E. Thornton,et al.  Recent trends in hydrologic balance have enhanced the terrestrial carbon sink in the United States , 2002 .

[12]  I. C. Prentice,et al.  Climatic Control of the High-Latitude Vegetation Greening Trend and Pinatubo Effect , 2002, Science.

[13]  C. Tucker,et al.  Northern hemisphere photosynthetic trends 1982–99 , 2003 .

[14]  Dennis D. Baldocchi,et al.  Response of a Deciduous Forest to the Mount Pinatubo Eruption: Enhanced Photosynthesis , 2003, Science.

[15]  C. Tucker,et al.  Climate-Driven Increases in Global Terrestrial Net Primary Production from 1982 to 1999 , 2003, Science.

[16]  I. C. Prentice,et al.  Evaluation of ecosystem dynamics, plant geography and terrestrial carbon cycling in the LPJ dynamic global vegetation model , 2003 .

[17]  J. Zak,et al.  Convergence across biomes to a common rain-use efficiency , 2004, Nature.

[18]  J. Berry,et al.  A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species , 1980, Planta.

[19]  I. C. Prentice,et al.  A dynamic global vegetation model for studies of the coupled atmosphere‐biosphere system , 2005 .

[20]  P. Ciais,et al.  Europe-wide reduction in primary productivity caused by the heat and drought in 2003 , 2005, Nature.

[21]  T. D. Mitchell,et al.  An improved method of constructing a database of monthly climate observations and associated high‐resolution grids , 2005 .

[22]  R. Giering,et al.  Two decades of terrestrial carbon fluxes from a carbon cycle data assimilation system (CCDAS) , 2005 .

[23]  S. Piao,et al.  Changes in vegetation net primary productivity from 1982 to 1999 in China , 2005 .

[24]  C J Tucker,et al.  Drier summers cancel out the CO2 uptake enhancement induced by warmer springs. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[25]  Edwin W. Pak,et al.  An extended AVHRR 8‐km NDVI dataset compatible with MODIS and SPOT vegetation NDVI data , 2005 .

[26]  S S I T C H,et al.  Evaluation of Ecosystem Dynamics, Plant Geography and Terrestrial Carbon Cycling in the Lpj Dynamic Global Vegetation Model , 2022 .