English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. Methane (CH 4 ) seepage (i.e., steady or episodic flowof gaseous hydrocarbons from subsurface reservoirs) has been identified as asignificant source of atmospheric CH 4 . However, radiocarbon data frompolar ice cores have recently brought into question the magnitude of fossilCH 4 seepage naturally occurring. In northern high latitudes, seepage ofsubsurface CH 4 is impeded by permafrost and glaciers, which are underan increasing risk of thawing and melting in a globally warming world,implying the potential release of large stores of CH 4 in the future.Resolution of these important questions requires a better constraint andmonitoring of actual emissions from seepage areas. The measurement of theseseeps is challenging, particularly in aquatic environments, because theyinvolve large and irregular gas flow rates, unevenly distributed bothspatially and temporally. Large macroseeps are particularly difficult tomeasure due to a lack of lightweight, inexpensive methods that can bedeployed in remote Arctic environments. Here, we report the use of a mobilechamber for measuring emissions at the surface of ice-free lakes subject tointense CH 4 macroseepage. Tested in a remote Alaskan lake, the methodwas validated for the measurement of fossil CH 4 emissions of up to 1.08  ×  10 4  g CH 4  m −2  d −1 (13.0 L m −2  min −1 of 83.4 % CH 4 bubbles), which is within the range of global fossilmethane seepage and several orders of magnitude above standard ecologicalemissions from lakes. In addition, this method allows for low diffusive fluxmeasurements. Thus, the mobile chamber approach presented here covers theentire magnitude range of CH 4 emissions currently identified, fromthose standardly observed in lakes to intense macroseeps, with a singleapparatus of moderate cost.

Technical note: Mobile open dynamic chamber measurement of methane macroseeps in lakes