Passive sampling method for high-resolution concentration and isotopic composition of dissolved methane in Arctic lakes

Methane production and bubble emissions from arctic lakes: Isotopic implications for source pathways and ages

[1] This study reports an atmospheric methane (CH4) source term previously uncharacterized regarding strength and isotopic composition. Methane emissions from 14 Siberian lakes and 9 Alaskan lakes were characterized using stable isotopes (C and D) and radiocarbon (C) analyses. We classified ebullition (bubbling) into three categories (background, point sources, and hot spots) on the basis of fl...

On-Line Measurement of Dissolved Methane Concentration During Methane Fermentation in a Loop Bioreactor

A dissolved methane sensor based on silicone tube was designed, constructed and optimized.The silicone tube diameter, silicone tube length and helium flow rate (as the carrier gas(were considered as process parameters to be optimized.A continuous stream of helium (50 mL/min) was directed through the tubing, sweeping out the...

Factors Controlling Methane in Arctic Lakes of Southwest Greenland

We surveyed 15 lakes during the growing season of 2014 in Arctic lakes of southwest Greenland to determine which factors influence methane concentrations in these systems. Methane averaged 2.5 μmol L-1 in lakes, but varied a great deal across the landscape with lakes on older landscapes farther from the ice sheet margin having some of the highest values of methane reported in lakes in the north...

The carbon isotopic composition of dissolved inorganic carbon in perennially ice-covered Antarctic lakes: searching for a biogenic signature

The stable-isotopic signature of dissolved inorganic carbon (DIC) has been routinely used in temperate lake systems to investigate the biogeochemical dynamics of carbon. We studied seven perennially ice-covered lakes in the McMurdo Dry Valleys, Antarctica, to ascertain how carbon cycling affects the dC of DIC in water columns of these systems. Unlike temperate lakes and, in fact, most polar lak...

JPL Project: Identification of Methane Seeps under Arctic Lakes