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Boreal ecosystems sequestered more carbon in warmer years

by: Jing M. Chen, Baozhang Chen, Kaz Higuchi, Jane Liu, Douglas Chan, Douglas Worthy, Pieter Tans, Andy Black
Geophysical Research Letters, Vol. 33 (19 May 2006), L10803.

X Abstract

A 13-year (1990–1996, 1999–2004), hourly air CO<sub>2</sub> record measured on a 40 m tower in northern Canada is analyzed against interpolated marine boundary layer CO<sub>2</sub> data representing the free troposphere above the tower. In warmer years, the planetary boundary layer was more depleted with CO<sub>2</sub>, suggesting that the land area (10<sup>3</sup>–10<sup>4</sup> km<sup>2</sup>) upwind of the tower sequestered more carbon. After using a novel approach to derive the photosynthetic flux from the air CO<sub>2</sub> diurnal variation pattern, it is confirmed that boreal ecosystem photosynthesis increased more than ecosystem respiration in warmer years.

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American Geophysical Union, DOI

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