scholarly journals Energy balance and canopy conductance of a boreal aspen forest: Partitioning overstory and understory components

1997 ◽  
Vol 102 (D24) ◽  
pp. 28915-28927 ◽  
Author(s):  
P. D. Blanken ◽  
T. A. Black ◽  
P. C. Yang ◽  
H. H. Neumann ◽  
Z. Nesic ◽  
...  
Keyword(s):  
Energy Balance ◽  
Canopy Conductance ◽  
Aspen Forest

Effects of seasonal and interannual climate variability on net ecosystem productivity of boreal deciduous and conifer forests

2002 ◽  
Vol 32 (5) ◽  
pp. 878-891 ◽  
Author(s):  
M A Arain ◽  
T A Black ◽  
A G Barr ◽  
P G Jarvis ◽  
J M Massheder ◽  
...  
Keyword(s):  
Populus Tremuloides ◽  
Land Surface ◽  
Black Spruce ◽  
Climatic Variability ◽  
Flux Measurement ◽  
Canopy Conductance ◽  
Net Ecosystem Productivity ◽  
Spruce Forest ◽  
Ecosystem Productivity ◽  
Aspen Forest

The response of net ecosystem productivity (NEP) and evaporation in a boreal aspen (Populus tremuloides Michx.) forest and a black spruce (Picea mariana (Mill.) BSP) forest in Canada was compared using a newly developed realistic model of surface-atmosphere exchanges of carbon dioxide (CO2), water vapor, and energy as well as eddy covariance flux measurements made over a 6-year period (1994-1999). The model was developed by incorporating a process-based two-leaf (sunlit and shaded) canopy conductance and photosynthesis submodel in the Canadian Land Surface Scheme (CLASS). A simple submodel of autotrophic and heterotrophic respiration was combined with the photosynthesis model to simulate NEP. The model performed well in simulating half-hourly, daily, and monthly mean CO2 exchange and evaporation values in both deciduous and coniferous forests. Modeled and measured results showed a linear relationship between CO2 uptake and evaporation, and for each kilogram of water transpired, approximately 3 g of carbon (C) were photosynthesized by both ecosystems. The model results confirmed that the aspen forest was a weak to moderate C sink with considerable interannual variability in C uptake. In the growing season, the C uptake capacity of the aspen forest was over twice that of the black spruce forest. Warm springs enhanced NEP in both forests; however, high mid-summer temperatures appear to have significantly reduced NEP at the black spruce forest as a result of increased respiration. The model suggests that the black spruce forest is a weak C sink in cool years and a weak C source in warm years. These results show that the C balance of these two forests is sensitive to seasonal and interannual climatic variability and stresses the importance of continuous long-term flux measurement to confirm modeling results.

scholarly journals Energy balance and canopy conductance of a tropical semi-deciduous forest of the southern Amazon Basin

2008 ◽  
Vol 44 (3) ◽  
Author(s):  
George L. Vourlitis ◽  
José de Souza Nogueira ◽  
Francisco de Almeida Lobo ◽  
Kerrie M. Sendall ◽  
Sérgio Roberto de Paulo ◽  
...  
Keyword(s):  
Energy Balance ◽  
Amazon Basin ◽  
Deciduous Forest ◽  
Canopy Conductance

An optimized two source energy balance model based on complementary concept and canopy conductance

2019 ◽  
Vol 223 ◽  
pp. 243-256 ◽  
Author(s):  
Guojing Gan ◽  
Tingting Kang ◽  
Shuai Yang ◽  
Jingyi Bu ◽  
Zhiming Feng ◽  
...  
Keyword(s):  
Energy Balance ◽  
Energy Balance Model ◽  
Balance Model ◽  
Canopy Conductance ◽  
Model Based

Seasonal variation in energy balance and canopy conductance for a tropical savanna ecosystem of south central Mato Grosso, Brazil

2014 ◽  
Vol 119 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Thiago R. Rodrigues ◽  
George L. Vourlitis ◽  
Francisco de A. Lobo ◽  
Renan G. de Oliveira ◽  
José de S. Nogueira
Keyword(s):  
Seasonal Variation ◽  
Energy Balance ◽  
Canopy Conductance ◽  
Tropical Savanna ◽  
Mato Grosso ◽  
South Central

Effects of Ambipolar Diffusion on Prominence Thread Models

1994 ◽  
Vol 144 ◽  
pp. 315-321 ◽  
Author(s):  
M. G. Rovira ◽  
J. M. Fontenla ◽  
J.-C. Vial ◽  
P. Gouttebroze
Keyword(s):  
Energy Balance ◽  
Transition Region ◽  
Ambipolar Diffusion ◽  
Line Profiles ◽  
Balance Equations ◽  
Model Calculations ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

Influence of Magnetic Fields on Solar Hydrodynamics: Experimental Results

1977 ◽  
Vol 36 ◽  
pp. 143-180 ◽  
Author(s):  
J.O. Stenflo
Keyword(s):  
Solar Activity ◽  
Energy Balance ◽  
Magnetic Fields ◽  
Solar Atmosphere ◽  
General Problem ◽  
Solar Rotation ◽  
Active Regions ◽  
Physical Conditions ◽  
Dynamic Phenomena

It is well-known that solar activity is basically caused by the Interaction of magnetic fields with convection and solar rotation, resulting in a great variety of dynamic phenomena, like flares, surges, sunspots, prominences, etc. Many conferences have been devoted to solar activity, including the role of magnetic fields. Similar attention has not been paid to the role of magnetic fields for the overall dynamics and energy balance of the solar atmosphere, related to the general problem of chromospheric and coronal heating. To penetrate this problem we have to focus our attention more on the physical conditions in the ‘quiet’ regions than on the conspicuous phenomena in active regions.

Circulating Concentrations of Human Peptide YY: Influence of Acute and Chronic Energy Balance Changes

2005 ◽  
Vol 113 (S 1) ◽  
Author(s):  
B Otto ◽  
H Rochlitz ◽  
M Möhlig ◽  
L Burget ◽  
J Kampe ◽  
...  
Keyword(s):  
Energy Balance ◽  
Peptide Yy
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