Colorado mountains
From Long-Term Data to Understanding: Toward a Predictive Ecology
2015 LTER ASM Estes Park, CO - August 30 - September 2, 2015

Influence of Daytime Tide Events on CO2 Exchange between Salt Marsh and Atmosphere

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Poster Number: 
Presenter/Primary Author: 
Hafsah Nahrawi
Monique Leclerc
Gengsheng Zhang
Roshani Pahari
Daniela Di Iorio
Merryl Alber
Wade Sheldon
Jacob Shalack

Salt marshes are among the most productive and dynamic ecosystems on Earth and globally sequester an average of 210 g C m-2 yr-1. The ecosystem is very dynamic, which responds to changing environmental conditions such as sea-level rise, tidal range and coastal engineering. In order to understand the role of this ecosystem in the carbon cycle and its changes as a result of rapid climate change and human disturbance, we need a baseline record particularly on CO2 exchange between this ecosystem and atmosphere. The goal of this study is to determine the effects of daytime tide events on the exchange of CO2 in salt marsh ecosystem dominated by Spartina alterniflora using eddy-covariance method. The study was conducted at Sapelo Island, GA. Two eddy covariance systems were set up in July 2013 to capture 10 hz data of CO2. Three layers of signal processing and data quality screening were applied to the dataset and 30-min fluxes of CO2 were calculated. Tide ratio (ratio of tide height to plant height; tide ratio ≥ 1, plant is completely submerged; tide ratio = 0, plant is totally exposed to the air) was established to determine the effect of both tide and plant heights on CO2 exchange. During daytime high tide events, a reduction of CO2 exchange was observed. The conditions with high tide ratio had smaller CO2 exchange when compared to conditions with low tide ratio. 

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