Net regional ecosystem CO2 exchange from airborne and ground-based eddy covariance, land-use maps and weather observations
| Autor: | Markus Reichstein, Franco Miglietta, Ronald Hutjes, Beniamino Gioli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
water-vapor
Eddy covariance Climate change west netherlands flux measurements carbon-dioxide germany soil respiration landgebruik Soil respiration models vegetation greenhouse gases Alterra - Centre for Water and Climate eddy covariance Environmental Chemistry Wageningen Environmental Research weather data General Environmental Science forests Global and Planetary Change eddy-covariantie Ecology Land use west-nederland carbon dioxide land use kooldioxide Climatology Greenhouse gas Environmental science Spatial variability Terrestrial ecosystem spatial variability Arable land aircraft broeikasgassen weersgegevens Alterra - Centrum Water en Klimaat |
| Zdroj: | Global change biology 13 (2007): 548–560. doi:10.1111/j.1365-2486.2006.01219.x info:cnr-pdr/source/autori:F Miglietta, B Gioli, R W A Hutjes, M Reichstein/titolo:Net regional ecosystem CO2 exchange from airborne and ground-based eddy covariance, land-use maps and weather observations/doi:10.1111%2Fj.1365-2486.2006.01219.x/rivista:Global change biology (Print)/anno:2007/pagina_da:548/pagina_a:560/intervallo_pagine:548–560/volume:13 Global Change Biology 13 (2007) 3 Global Change Biology, 13(3), 548-560 |
| ISSN: | 1354-1013 |
| DOI: | 10.1111/j.1365-2486.2006.01219.x |
| Popis: | Measurements of regional net ecosystem exchange (NEE) were made over a period of 21 days in summer 2002 in the South-Central part of the Netherlands and extrapolated to an area of 13 000 km2 using a combination of flux measurements made by a Sky Arrow ERA research aircraft, half-hourly eddy covariance data from four towers, half-hourly weather data recorded by three weather stations and detailed information on regional land use. Measurements of regional net ecosystem exchange (NEE) were made over a period of 21 days in summer 2002 in the South-Central part of the Netherlands and extrapolated to an area of 13 000 km(2) using a combination of flux measurements made by a Sky Arrow ERA research aircraft, half-hourly eddy covariance data from four towers, half-hourly weather data recorded by three weather stations and detailed information on regional land use. The combination of this type of information allowed to estimate the net contribution of the terrestrial ecosystems to the overall regional carbon flux and to map dynamically the temporal and spatial variability of the fluxes. A regional carbon budget was calculated for the study period and the contributions of the different land uses to the overall regional flux, were assessed. Ecosystems were, overall, a small source of carbon to the atmosphere equivalent to to 0.23 +/- 0.025 g C m(-2) day(-1). When considered separately, arable and grasslands were a source of, respectively, 0.68 +/- 0.022 and 1.28 +/- 0.026 g C m(-2) day(-1). Evergreen and deciduous forests were instead a sink of -1.42 +/- 0.015 g C m(-2) day(-1). During the study period, forests offset approximately 3.5% of anthropogenic carbon emission estimates obtained from inventory data. Lacking of a robust validation, NEE values obtained with this method were compared with independent state of art estimates of the regional carbon balance that were obtained by applying a semi-empirical model of NEE driven by MODIS satellite fAPAR data. The comparison showed an acceptable matching for the carbon balance of forest that was a sink in both cases, while a much larger difference for arable and grassland was found. Those ecosystems were a sink for satellite-based estimates while they were a source for the combined aircraft and tower estimates. Possible causes of such differences are discussed and partly addressed. The importance of new methods for determining carbon balance at the regional scale, is outlined. |
| Databáze: | OpenAIRE |
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