In:
Science Advances, American Association for the Advancement of Science (AAAS), Vol. 6, No. 5 ( 2020-01-31)
Abstract:
We demonstrate direct eddy covariance (EC) observations of methane (CH 4 ) fluxes between the sea and atmosphere from an icebreaker in the eastern Arctic Ocean. EC-derived CH 4 emissions averaged 4.58, 1.74, and 0.14 mg m −2 day −1 in the Laptev, East Siberian, and Chukchi seas, respectively, corresponding to annual sea-wide fluxes of 0.83, 0.62, and 0.03 Tg year −1 . These EC results answer concerns that previous diffusive emission estimates, which excluded bubbling, may underestimate total emissions. We assert that bubbling dominates sea-air CH 4 fluxes in only small constrained areas: A ~100-m 2 area of the East Siberian Sea showed sea-air CH 4 fluxes exceeding 600 mg m −2 day −1 ; in a similarly sized area of the Laptev Sea, peak CH 4 fluxes were ~170 mg m −2 day −1 . Calculating additional emissions below the noise level of our EC system suggests total ESAS CH 4 emissions of 3.02 Tg year −1 , closely matching an earlier diffusive emission estimate of 2.9 Tg year −1 .
Type of Medium:
Online Resource
ISSN:
2375-2548
DOI:
10.1126/sciadv.aay7934
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2020
detail.hit.zdb_id:
2810933-8
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