Table of Contents
Journal of Climatology
Volume 2015 (2015), Article ID 262980, 11 pages
http://dx.doi.org/10.1155/2015/262980
Research Article

Amplified Feedback Mechanism of the Forests-Aerosols-Climate System

Department of Meteorology, Stockholm University, 106 91 Stockholm, Sweden

Received 30 December 2014; Revised 9 March 2015; Accepted 10 March 2015

Academic Editor: Alexey V. Eliseev

Copyright © 2015 Thomas Hede et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Climate change very likely has effects on vegetation so that trees grow faster due to carbon dioxide fertilization (a higher partial pressure increases the rate of reactions with Rubisco during photosynthesis) and that trees can be established in new territories in a warmer climate. This has far-reaching significance for the climate system mainly due to a number of feedback mechanisms still under debate. By simulating the vegetation using the Lund-Potsdam-Jena guess dynamic vegetation model, a territory in northern Russia is studied during three different climate protocols assuming a doubling of carbon dioxide levels compared to the year 1975. A back of the envelope calculation is made for the subsequent increased levels of emissions of monoterpenes from spruce and pine forests. The results show that the emissions of monoterpenes at the most northern latitudes were estimated to increase with over 500% for a four-degree centigrade increase protocol. The effect on aerosol and cloud formation is discussed and the cloud optical thickness is estimated to increase more than 2%.