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Water temperature c...
Water temperature control on CO2 flux and evaporation over a subtropical seagrass meadow revealed by atmospheric eddy covariance
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- Van Dam, Bryce R. (författare)
- Helmholtz Zentrum Geesthacht HZG, Inst Coastal Res, Geesthacht, Germany.;Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA.;Florida Int Univ, Ctr Coastal Oceans Res, Miami, FL 33199 USA.
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- Lopes, Christian C. (författare)
- Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA.;Florida Int Univ, Ctr Coastal Oceans Res, Miami, FL 33199 USA.
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- Polsenaere, Pierre (författare)
- IFREMER, Lab Environm Ressources Pertuis Charentais LER PC, La Tremblade, France.
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- Price, Rene M. (författare)
- Florida Int Univ, Dept Earth & Environm, Miami, FL 33199 USA.;Florida Int Univ, Southeast Environm Res Ctr, Miami, FL 33199 USA.
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- Rutgersson, Anna, 1971- (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära
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- Fourqurean, James W. (författare)
- Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA.;Florida Int Univ, Ctr Coastal Oceans Res, Miami, FL 33199 USA.
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Helmholtz Zentrum Geesthacht HZG, Inst Coastal Res, Geesthacht, Germany;Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA.;Florida Int Univ, Ctr Coastal Oceans Res, Miami, FL 33199 USA. Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA.;Florida Int Univ, Ctr Coastal Oceans Res, Miami, FL 33199 USA. (creator_code:org_t)
- 2020-10-08
- 2021
- Engelska.
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Ingår i: Limnology and Oceanography. - : John Wiley & Sons. - 0024-3590 .- 1939-5590. ; 66:2, s. 510-527
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Abstract
Ämnesord
Stäng
- Subtropical seagrass meadows play a major role in the coastal carbon cycle, but the nature of air-water CO2 exchanges over these ecosystems is still poorly understood. The complex physical forcing of air-water exchange in coastal waters challenges our ability to quantify bulk exchanges of CO2 and water (evaporation), emphasizing the need for direct measurements. We describe the first direct measurements of evaporation and CO2 flux over a calcifying seagrass meadow near Bob Allen Keys, Florida. Over the 78-d study, CO2 emissions were 36% greater during the day than at night, and the site was a net CO2 source to the atmosphere of 0.27 +/- 0.17 mu mol m(-2)s(-1)(x (c) over bar +/- standard deviation). A quarter (23%) of the diurnal variability in CO2 flux was caused by the effect of changing water temperature on gas solubility. Furthermore, evaporation rates were similar to 10 times greater than precipitation, causing a 14% increase in salinity, a potential precursor of seagrass die-offs. Evaporation rates were not correlated with solar radiation, but instead with air-water temperature gradient and wind shear. We also confirm the role of convective forcing on night-time enhancement and day-time suppression of gas transfer. At this site, temperature trends are regulated by solar heating, combined with shallow water depth and relatively consistent air temperature. Our findings indicate that evaporation and air-water CO2 exchange over shallow, tropical, and subtropical seagrass ecosystems may be fundamentally different than in submerged vegetated environments elsewhere, in part due to the complex physical forcing of coastal air-sea gas transfer.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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