Sentences with phrase «tg ch4»

Using correlations between concentrations of CH4 and carbon monoxide (CO) we estimated total emissions of 30.8 Tg CH4 during the 2008 monsoon season (June — September), 19.7 Tg of which were identified as additional, monsoon - related biogenic methane using the relationship of CH4 to ethane (C2H6).

For latitudes above 60 ° N, emissions are estimated to be 18 — 29 Tg CH4 per year on the basis of top - down atmospheric model approaches.

We estimate that domain - averaged net CH4 flux from May to September ranged from 2.0 to 36 mgm2 d1 and that 2.20.5 Tg, 1.9 0.4 Tg, and 2.30.6 Tg CH4 were emitted from our domain for 2012, 2013, and 2014, respectively.

The US is apparently emitting more than we thought we were, maybe 30 Tg CH4 per year.

Call it 20 - 30 Tg CH4 per year from both sources.

The Arctic Monitoring and Assessment Program (AMAP) carbon assessment published in 2009 highlighted the disparity in methane emissions estimated by extrapolating data from wetlands, lakes, and coastal waters underlain by permafrost (32 to 112 Tg CH4 yr - 1) and estimates based on spatial and temporal variability of atmospheric methane concentrations (15 to 50 Tg CH4 yr - 1).

For latitudes above 60 ° N, emissions are estimated to be 18 — 29 Tg CH4 per year on the basis of top - down atmospheric model approaches.

Not exact matches

Total global CH4 emissions are likely 550 — 650 billion kilograms per year (550 — 650 teragrams, Tg).

First estimates of ESAS methane emissions indicated the current atmospheric budget, which arises from gradual diffusion and ebullition, was on par with estimates of methane emissions from the entire World Ocean (≈ 8 Tg - CH4).

Emissions from these sources are estimated to be as large as 40 to 60 Tg (CH4) yr — 1.

A new source of 17 Tg / yr continuously adds approximately 60 ppbv to CH4 concentrations.

Total global CH4 emissions are likely 550 — 650 billion kilograms per year (550 — 650 teragrams, Tg).

After accounting for the ~ 3.9 Tg attributed to rice agriculture in the current inventories, ~ 15.8 Tg of additional CH4 remain.

Total average annual emissions during the period considered here are approximately 582 Tg (CH4) yr — 1.

However, the AR4 estimate has been increased by 1 % (to 581 Tg (CH4) yr — 1) to take into account the recalibration of the CH4 scale explained in Chapter 2.

Consequently, in the Fourth Assessment Report (AR4) the sink strength is treated as in the TAR (576 Tg (CH4) yr — 1).

Oxidation by chlorine (Cl) atoms in the marine atmospheric boundary layer is suggested as an additional sink for CH4, possibly constituting an additional loss of about 19 Tg (CH4) yr — 1 (Gupta et al., 1997; Tyler et al., 2000; Platt et al., 2004; Allan et al., 2005).

For a conversion factor of 2.78 Tg (CH4) per ppb and an atmospheric concentration of 1,774 ppb, the atmospheric burden of CH4 in 2005 was 4,932 Tg, with an annual average increase (2000 — 2005) of about 0.6 Tg yr — 1.

Total global pre-industrial emissions of CH4 are estimated to be 200 to 250 Tg (CH4) yr — 1 (Chappellaz et al., 1993; Etheridge et al., 1998; Houweling et al., 2000; Ferretti et al., 2005; Valdes et al., 2005).

It is also a modest source of methane (CH4): between 15 and 50 Tg (CH4) / yr are emitted mostly from seasonally unfrozen wetlands corresponding to about 10 % of the global wetland methane source.