Details:

Journal Title:
Proceedings of the National Academy of Science of the United States
Personal Author:
Commane, Róisín ; Lindaas, Jakob ; Benmergui, Joshua ; Luus, Kristina A. ; Chang, Rachel Y.-W. ; ... More +
Commane, Róisín ; Lindaas, Jakob ; Benmergui, Joshua ; Luus, Kristina A. ; Chang, Rachel Y.-W. ; Daube, Bruce C. ; Euskirchen, Eugénie S. ; Henderson, John M. ; Karion, Anna ; Miller, John B. ; Miller, Scot M. ; Parazoo, Nicholas C. ; Randerson, James T. ; Sweeney, Colm ; Tans, Pieter ; Thoning, Kirk ; Veraverbeke, Sander ; Miller, Charles E. ; Wofsy, Steven C. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; GML (Global Monitoring Laboratory)
OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; GML (Global Monitoring Laboratory) Less -
Description:
High-latitude ecosystems have the capacity to release large amounts of carbon dioxide (CO2) to the atmosphere in response to increasing temperatures, representing a potentially significant positive feedback within the climate system. Here, we combine aircraft and tower observations of atmospheric CO2 with remote sensing data and meteorological products to derive temporally and spatially resolved year-round CO2 fluxes across Alaska during 2012-2014. We find that tundra ecosystems were a net source of CO2 to the atmosphere annually, with especially high rates of respiration during early winter (October through December). Long-term records at Barrow, AK, suggest that CO2 emission rates from North Slope tundra have increased during the October through December period by 73% +/- 11% since 1975, and are correlated with rising summer temperatures. Together, these results imply increasing early winter respiration and net annual emission of CO2 in Alaska, in response to climate warming. Our results provide evidence that the decadalscale increase in the amplitude of the CO2 seasonal cycle may be linked with increasing biogenic emissions in the Arctic, following the growing season. Early winter respirationwas not well simulated by the Earth System Models used to forecast future carbon fluxes in recent climate assessments. Therefore, these assessments may underestimate the carbon release from Arctic soils in response to a warming climate.
Source:
Proceedings of the National Academy of Sciences of the United States of America, 114(21), 5361-5366.
DOI:
https://doi.org/10.1073/pnas.1618567114
Document Type:
Journal Article
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
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urn:sha256:53f081ce7580dc0050f7c2e96c825610f8c6c66391c2844273257795954232f5
Download URL:
https://repository.library.noaa.gov/view/noaa/22128/noaa_22128_DS1.pdf
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