Forest canopy productivity index

Article Abstract:

Canopy productivity index (CPI) is a good measure to assess the response of forests to an increase in atmospheric carbon dioxide (CO2) content. CPI is the annual formation of wood per unit leaf area. Normalization of leaf area to wood accumulation increase is valid in forests where leaf area is a relatively constant value. An increase of 300-350 parts per million of CO2 increases CPI by 29%. The value of this increase is independent of culture conditions, species, and dry mass response. The increase is consistent, and tree growth increases marginally and is sustained in CO2 rich conditions.

Usage, Forest productivity

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El Nino-like climate change in a model with increased atmospheric CO2 concentrations

Article Abstract:

A global coupled ocean-atmosphere general circulation model shows an increase in the sea surface temperature (SST) of the tropical Pacific Ocean east of 180 degrees longitude with an increase in atmospheric carbon dioxide. The SST increase is due to cloud albedo feedback, changes in cloud cover, and a decrease in easterly winds and ocean upwelling. The increase is accompanied by anomalies in precipitation and circulation. These changes are similar to observed temperature changes and changes during El Nino events in the tropical Pacific Ocean.

Models, Pacific Ocean, Observations, El Nino, El Nino Current, Natural history, Ocean circulation

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Detection of a direct carbon dioxide effect in continental river runoff records

Article Abstract:

A mechanistic land surface model and optional fingerprinting statistical techniques are used to analyze observation-based continental river runoff records for evidence of runoff changes from the potential drivers. The detection of a direct carbon dioxide (CO2) effect on global river runoff suggest that raised CO2 levels are already having direct influence on the water balance at the land surface.

Science & research, Research, Runoff, Water balance (Hydrology)

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