Table 1 EC average sea-air CH4 fluxes by region (in ng m−2 s−1 and mg m−2 day−1).

Regions marked with * are the same regions as used in table 2 of (4) for calculated sea-air CH4 fluxes. Note that many of the regions are overlapping. “Seeps only” is defined as stations/areas with EC CH4 measurements >6 mg m−2 day−1 (see Table 2 for locations).

Spatially normalized fluxes
Average
(ng m−2 s−1)
Average
(mg m−2 day−1)
Maximum
(mg m−2 day−1)
No. of EC measurement
locations
Arctic Ocean*1.390.126.3349
Shelf breaks and upper
continental slope*
1.010.096.4241
Shelf seas (Laptev + East
Siberian + Chukchi seas)
17.31.506181851
Laptev Sea (all)*53.14.58170265
Laptev Sea, seeps only36321.417032
East Siberian Sea (all)20.21.74618834
East Siberian Sea, ice-covered
/melt regions
(<DoY 222.3)*
23.52.02618695
East Siberian Sea, ice-covered
/melt regions
24.12.09618677
East Siberian Sea, ice-free3.170.278.6157
East Siberian Sea, seeps only100463.361817
Chukchi Sea, ice-free2.510.228.4429
Chukchi Sea, ice-covered/melt
regions
0.390.038.3326
Chukchi Sea (all)1.620.148.4755