Addressing Effects of Environment on Eddy-Covariance Flux Estimates at a Temperate Sedge-Grass Marsh

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F23%3A00571779" target="_blank" >RIV/86652079:_____/23:00571779 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10546-022-00755-0" target="_blank" >https://link.springer.com/article/10.1007/s10546-022-00755-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10546-022-00755-0" target="_blank" >10.1007/s10546-022-00755-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Addressing Effects of Environment on Eddy-Covariance Flux Estimates at a Temperate Sedge-Grass Marsh

Popis výsledku v původním jazyce

We examined the net-ecosystem-exchange (NEE)-based annual carbon-balance estimates obtained from eddy-covariance (EC) measurements at an unmanaged sedge-grass marsh ecosystem (Trebon, Czech Republic, 49 degrees 1' N, 14 degrees 46' E), seeking methods to improve the EC measurements in inhomogeneous environment. The data filtering procedure was developed using three thresholds: (a) a stationarity test, (b) a stability u(SIC)threshold, and (c) a high relative humidity RH-threshold. This procedure was tested in 2014, a year without significant floods and drought events led to a stable water table, reducing the effect of soil respiration on the EC measurements. Estimates of annual carbon-balance were reduced from 182 to 234 +/- 12 gC m(-2) year(-1) for the initial data to 39-44 +/- 8 gC m(-2) year(-1 )after the RH <= 95% filtering and to 24-26 +/- 7 gC m-2 year(-1) after the further u,,, >= 0.1 m s-1 filtering. Applying the precipitation/fog threshold reduced this balance to 10-12 +/- 7 gC m-2 year(-1), closer to carbon neutrality. Up to 9.5% of this identified shift occurred during apparent nocturnal downslope katabatic drainage flows or plume descent coming from the nearby town of Trebon. High-RH conditions account for up to 27% of this shift. Moreover, both conditions together account for an additional 67% of the identified carbon-balance change. Removing these non-ecosystem-related processes brings EC measurements closer to values of an unmanaged-ecosystem productivity, providing a better NEE-based estimate for the net ecosystem production. The presented procedure is applicable to EC measurements conducted at different wetlands or terrestrial ecosystems with similar conditions.

Název v anglickém jazyce

Addressing Effects of Environment on Eddy-Covariance Flux Estimates at a Temperate Sedge-Grass Marsh

Popis výsledku anglicky

We examined the net-ecosystem-exchange (NEE)-based annual carbon-balance estimates obtained from eddy-covariance (EC) measurements at an unmanaged sedge-grass marsh ecosystem (Trebon, Czech Republic, 49 degrees 1' N, 14 degrees 46' E), seeking methods to improve the EC measurements in inhomogeneous environment. The data filtering procedure was developed using three thresholds: (a) a stationarity test, (b) a stability u(SIC)threshold, and (c) a high relative humidity RH-threshold. This procedure was tested in 2014, a year without significant floods and drought events led to a stable water table, reducing the effect of soil respiration on the EC measurements. Estimates of annual carbon-balance were reduced from 182 to 234 +/- 12 gC m(-2) year(-1) for the initial data to 39-44 +/- 8 gC m(-2) year(-1 )after the RH <= 95% filtering and to 24-26 +/- 7 gC m-2 year(-1) after the further u,,, >= 0.1 m s-1 filtering. Applying the precipitation/fog threshold reduced this balance to 10-12 +/- 7 gC m-2 year(-1), closer to carbon neutrality. Up to 9.5% of this identified shift occurred during apparent nocturnal downslope katabatic drainage flows or plume descent coming from the nearby town of Trebon. High-RH conditions account for up to 27% of this shift. Moreover, both conditions together account for an additional 67% of the identified carbon-balance change. Removing these non-ecosystem-related processes brings EC measurements closer to values of an unmanaged-ecosystem productivity, providing a better NEE-based estimate for the net ecosystem production. The presented procedure is applicable to EC measurements conducted at different wetlands or terrestrial ecosystems with similar conditions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Boundary Layer Meteorology

ISSN

0006-8314

e-ISSN

1573-1472

Svazek periodika

186

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

34

Strana od-do

217-250

Kód UT WoS článku

000917105200001

EID výsledku v databázi Scopus

2-s2.0-85146572466