Separating the effects of albedo from eco-physiological changes on surface temperature along a successional chronosequence in the southeastern United States

Details Separating the effects of albedo from eco-physiological changes on surface temperature along a successional chronosequence in the southeastern United States Separating the effects of albedo from eco-physiological changes on surface temperature along a successional chronosequence in the southeastern United States

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421408j&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 21, CiteID L21408

Mathematics

Logic

7

Global Change: Land Cover Change, Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Oceanography: Biological And Chemical: Ecosystems, Structure, Dynamics, And Modeling (0439)

Scientific paper

In the southeastern United States (SE), the conversion of abandoned agricultural land to forests is the dominant feature of land-cover change. However, few attempts have been made to quantify the impact of such conversion on surface temperature. Here, this issue is explored experimentally and analytically in three adjacent ecosystems (a grass-covered old-field, OF, a planted pine forest, PP, and a hardwood forest, HW) representing a successional chronosequence in the SE. The results showed that changes in albedo alone can warm the surface by 0.9°C for the OF-to-PP conversion, and 0.7°C for the OF-to-HW conversion on annual time scales. However, changes in eco-physiological and aerodynamic attributes alone can cool the surface by 2.9 and 2.1°C, respectively. Both model and measurements consistently suggest a stronger over-all surface cooling for the OF-to-PP conversion, and the reason is attributed to leaf area variations and its impacts on boundary layer conductance.

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