التفاصيل البيبلوغرافية
العنوان: |
Atmospheric measurements of the terrestrial O2:CO2 exchange ratio of a midlatitude forest. |
المؤلفون: |
Battle, Mark O., Munger, J. William, Conley, Margaret, Sofen, Eric, Perry, Rebecca, Hart, Ryan, Davis, Zane, Scheckman, Jacob, Woogerd, Jayme, Graeter, Karina, Seekins, Samuel, David, Sasha, Carpenter, John |
المصدر: |
Atmospheric Chemistry & Physics; 2019, Vol. 19 Issue 13, p8687-8701, 15p, 1 Diagram, 2 Charts, 9 Graphs |
مصطلحات موضوعية: |
DECIDUOUS forests, FOREST canopies, MIXED forests, CARBON cycle, EXCHANGE, OZONE layer |
مصطلحات جغرافية: |
MASSACHUSETTS, UNITED States |
مستخلص: |
Measurements of atmospheric O2 have been used to quantify large-scale fluxes of carbon between the oceans, atmosphere and land since 1992. With time, datasets have grown and estimates of fluxes have become more precise, but a key uncertainty in these calculations is the exchange ratio of O2 and CO2 associated with the net land carbon sink (αB). We present measurements of atmospheric O2 and CO2 collected over a 6-year period from a mixed deciduous forest in central Massachusetts, USA (42.537 ∘ N, 72.171 ∘ W). Using a differential fuel-cell-based instrument for O2 and a nondispersive infrared analyzer for CO2 , we analyzed airstreams collected within and ∼5 m above the forest canopy. Averaged over the entire period of record, we find these two species covary with a slope of -1.081±0.007 mol of O2 per mole of CO2 (the mean and standard error of 6 h periods). If we limit the data to values collected on summer days within the canopy, the slope is -1.03±0.01. These are the conditions in which biotic influences are most likely to dominate. This result is significantly different from the value of - 1.1 widely used in O2 -based calculations of the global carbon budget, suggesting the need for a deeper understanding of the exchange ratios of the various fluxes and pools comprising the net sink. [ABSTRACT FROM AUTHOR] |
|
Copyright of Atmospheric Chemistry & Physics is the property of Copernicus Gesellschaft mbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
قاعدة البيانات: |
Complementary Index |