Table 1 Methane flux compilation for different mean bubble radii (a) and ebullition frequencies (fe). The extrapolation is based on areas of shallow gas given in Mogollon et al.88.

From: Discovery and quantification of a widespread methane ebullition event in a coastal inlet (Baltic Sea) using a novel sonar strategy

 

This study: Eckernförde Bay

Extrapolation

Total Seeps [#]

Bubble radius [mm]

Bubble rate [# s−1]

Volume per seep [cm3 s−1]

Areal flux [mg m−2 d−1]

Areal flux [μMol m−2 d−1]

Total flux from all seeps [10−4 Tg y−1]

Covered Area [km2]

Belt Seas & The Sound [km2]

Extrapolated Flux [Tg y−1]

15 events same magnitude [Tg (15*24 h)−1]

A. Best estimate

amean, fe_mean

2849

3.75

0.25

0.0552

30.737

1916.3

0.1010

0.90

1602

0.270

0.011

amin, fe_mean

2849

3

0.25

0.0283

15.737

981.13

0.0517

0.90

1602

0.138

0.006

amax, fe_mean

2849

4.5

0.25

0.0954

53.113

3311.3

0.1746

0.90

1602

0.466

0.019

B. Shift to max rate

amean, fe_max

2849

3.75

0.5

0.1105

61.474

3832.5

0.2020

0.90

1602

0.539

0.022

amin, fe_max

2849

3

0.5

0.0565

31.475

1962.3

0.1034

0.90

1602

0.276

0.011

amax, fe_max

2849

4.5

0.5

0.1909

106.23

6622.6

0.3491

0.90

1602

0.932

0.038

C. Shift to min rate

amean, fe_min

2849

3.75

0.0833

0.0184

10.246

638.75

0.0337

0.90

1602

0.090

0.004

amin, fe_min

2849

3

0.0833

0.0094

5.2458

327.04

0.0172

0.90

1602

0.046

0.002

amax, fe_min

2849

4.5

0.0833

0.0318

17.704

1103.8

0.0582

0.90

1602

0.155

0.006

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