BAWLD-CH<sub>4</sub>: a comprehensive dataset of methane fluxes from boreal and arctic ecosystems
<p>Methane (CH<span class="inline-formula"><sub>4</sub></span>) emissions from the boreal and arctic region are globally significant and highly sensitive to climate change. There is currently a wide range in estimates of high-latitude annual CH<span class=&...
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| Autores principales: | , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/d76be2988dd54e7ca4712ecbfa79e9b5 |
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| Sumario: | <p>Methane (CH<span class="inline-formula"><sub>4</sub></span>) emissions from the boreal and arctic
region are globally significant and highly sensitive to climate change.
There is currently a wide range in estimates of high-latitude annual
CH<span class="inline-formula"><sub>4</sub></span> fluxes, where estimates based on land cover inventories and
empirical CH<span class="inline-formula"><sub>4</sub></span> flux data or process models (bottom-up approaches)
generally are greater than atmospheric inversions (top-down approaches). A
limitation of bottom-up approaches has been the lack of harmonization
between inventories of site-level CH<span class="inline-formula"><sub>4</sub></span> flux data and the land cover
classes present in high-latitude spatial datasets. Here we present a
comprehensive dataset of small-scale, surface CH<span class="inline-formula"><sub>4</sub></span> flux data from 540
terrestrial sites (wetland and non-wetland) and 1247 aquatic sites (lakes
and ponds), compiled from 189 studies. The Boreal–Arctic Wetland and Lake
Methane Dataset (BAWLD-CH<span class="inline-formula"><sub>4</sub></span>) was constructed in parallel with a
compatible land cover dataset, sharing the same land cover classes to enable
refined bottom-up assessments. BAWLD-CH<span class="inline-formula"><sub>4</sub></span> includes information on
site-level CH<span class="inline-formula"><sub>4</sub></span> fluxes but also on study design (measurement method,
timing, and frequency) and site characteristics (vegetation, climate,
hydrology, soil, and sediment types, permafrost conditions, lake size and
depth, and our determination of land cover class). The different land cover
classes had distinct CH<span class="inline-formula"><sub>4</sub></span> fluxes, resulting from definitions that were
either based on or co-varied with key environmental controls. Fluxes of
CH<span class="inline-formula"><sub>4</sub></span> from terrestrial ecosystems were primarily influenced by water
table position, soil temperature, and vegetation composition, while CH<span class="inline-formula"><sub>4</sub></span>
fluxes from aquatic ecosystems were primarily influenced by water
temperature, lake size, and lake genesis. Models could explain more of the
between-site variability in CH<span class="inline-formula"><sub>4</sub></span> fluxes for terrestrial than aquatic
ecosystems, likely due to both less precise assessments of lake CH<span class="inline-formula"><sub>4</sub></span>
fluxes and fewer consistently reported lake site characteristics. Analysis
of BAWLD-CH<span class="inline-formula"><sub>4</sub></span> identified both land cover classes and regions within the
boreal and arctic domain, where future studies should be focused, alongside
methodological approaches. Overall, BAWLD-CH<span class="inline-formula"><sub>4</sub></span> provides a comprehensive
dataset of CH<span class="inline-formula"><sub>4</sub></span> emissions from high-latitude ecosystems that are useful
for identifying research opportunities, for comparison against new field
data, and model parameterization or validation. BAWLD-CH<span class="inline-formula"><sub>4</sub></span> can be
downloaded from <a href="https://doi.org/10.18739/A2DN3ZX1R">https://doi.org/10.18739/A2DN3ZX1R</a> (Kuhn et al., 2021).</p> |
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