ASSESSMENT OF WINTER FLUXES OF CO2 AND CH4 IN BLACK SPRUCE FOREST SOILS OF CENTRAL ...
Description:
This
research was carried out to estimate the winter fluxes of CO2 and CH4
by the concentration
profile method (indirect) and the chamber method (direct) at black spruce
forest soils of central Alaska during the winter 2004/5. The average winter
fluxes of CO2 and CH4 by the indirect and direct methods
were 0.24±0.06 (SE; standard error) and 0.21±0.06 gCO2-C/m2/d,
and 21.4±5.6 and 21.4±14 µgCH4-C/m2/h, respectively. The fluxes estimated by two methods are not a
significant difference based on a one-way ANOVA with a 95% confidence
level. The winter CO2 flux
corresponds to 30% of the annual CO2 emitted from Alaskan black
spruce forest soils. The average winter
emissions of CO2 and CH4 were 49±13 gCO2-C/m2
and 4.5±3.0 mgCH4-C/m2, respectively. This suggests that the winter emissions of CO2
and CH4 are an important part of the annual carbon budget in
seasonally snow-covered terrain.
Author's Names: Yongwon Kim, Masa Ueyama, Noriyuki Tanaka, et al
Filesize: 50.11 Kb
Added on: 01-Aug-2005 Downloads: 66
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ANALYSIS, INTEGRATION AND MODELING OF THE EARTH SYSTEM: INTEGRATING HUMAN PROCESSES WITH ...
Description: There is a growing recognition that the Earth itself
is a single system within which the biosphere is an active component. Human
activities are now so pervasive and profound in their consequences that they
affect the Earth at a global scale in complex, interactive and apparently
accelerating ways. The new IGBP project, Analysis, Integration and Modeling of
the Earth System (AIMES) is charged with integrating human processes with Earth
system processes.
Author's Names: K.A. Hibbard and D.S. Schimel
Filesize: 12.08 Kb
Added on: 29-Jul-2005 Downloads: 50
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AEOLIAN INPUT OF BIO-AVAILABLE IRON TO THE OCEAN
Description:
Atmospheric
deposition of mineral dust aerosols supplies the essential nutrient of iron to
the ocean. However, only the readily soluble
iron is available to biological uptake while the insoluble iron precipitates to
the ocean bottom. Here we present a
global model simulation of Aeolian iron input to the ocean, considering
hematite dissolution in mineral dust aerosols catalyzed by nitric and sulfuric
acids. Our model suggests that atmospheric
deposition of soluble iron to the oceans is much larger than previous model
results in high nitrate low chlorophyll (HNLC) regions.
Author's Names: S.-M. Fan, W. J. Moxim, and H. Levy II
Filesize: 482.29 Kb
Added on: 05-Aug-2005 Downloads: 70
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