Influence of methane sources in Northern Hemisphere high latitudes on the interhemispheric asymmetry of its atmospheric concentration and climate

Volodin, E. M.

doi:10.1134/s0001433815030123

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…The general lower than average XCH 4 levels over wetlands are found with both land cover data sets and retrieval algorithms (see Table 4; Figure 7), except for North America, South America and Australia. In general, the methane emission from South America and Australia is very low and follow a different trend than the rest of the world (see Figure 8) -the reason being that these two continents are located on the southern hemisphere and that most methane sources, artificial and natural, lies in the northern hemisphere (Volodin, 2015), but for North America the difference contradicts the common model, where tropical wetlands are expected to emit more methane, than wetlands at higher latitudes as the higher temperatures will lead to more biological activity (Lunt et al, 2019). An explanation for this disagreement could be that the larger temperatures lead to not only more methanogenic bacteria, but also more methanotrophic bacteria (Wu et al, 2010) or alternatively that the lower temperatures in North America compared to the tropical regions lead to less methanotrophic bacteria activity.…”

Section: Low Xch 4 Levels Over Wetlandsmentioning

confidence: 99%

Data driven analysis of atmospheric methane concentrations as function of geographic, land cover type and season

Karoff

Vara-Vela

2023

Front. Earth Sci.

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Over the last decade we have witnessed a rapid, so far unexplained, increase in the emission of methane to the atmosphere and this increase could lead to an acceleration of the ongoing climate changes. The increase is likely to originate from agriculture, but oil and gas production as well as wetlands are also under suspicion. The best way to quantify the emission of methane and other greenhouse gasses to our atmosphere is by using space based remote sensing. Here, we analyse 3 years of measurements of the column-averaged dry-air mole fraction of methane from the Tropospheric Monitoring Instrument on Sentinel-5P obtained with two different retrieval methods in order to evaluate the dependency on geographic, land cover type and season. The land cover types were obtained from the Moderate Resolution Imaging Spectroradiometer aboard the Terra and Aqua satellites and from the World Cover data product using observations from the Copernicus Sentinel-1 and Sentinel-2 missions. The analysis reveals that while the highest methane concentrations are generally found over croplands, the lowest are generally found over shrublands, which is in agreement with expectations. It is more surprising that the analysis also reveals lower than average methane concentrations over wetlands as wetlands are generally thought to be a major source of methane emission. Until this discrepancy is resolved the methane concentration over wetlands from the Tropospheric Monitoring Instrument on Sentinel-5P should be handled with caution. It is also found that the annual methane cycle, as seen in the measured methane concentrations, for croplands, shrublands and savannas is delayed in Africa compared to Asia.

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Section: Low Xch 4 Levels Over Wetlandsmentioning

confidence: 99%

Data driven analysis of atmospheric methane concentrations as function of geographic, land cover type and season

Karoff

Vara-Vela

2023

Front. Earth Sci.

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“…Skill of the INMCM was verified in reproduction of the modern climate (Volodin et al 2010(Volodin et al , 2013. INMCM has been widely used during recent years for studying interactions and feedbacks within the Earth's climate system; for instance, for elucidation of roles of greenhouse gases (Volodin 2014(Volodin , 2015, vegetation (Yurova and Volodin 2011) and aerosoles . Response times in the 'climatic' mega-block (subsystem) and in the ice-sheet subsystem (megablocs GrISM and AISM) of an ESM differ dramatically.…”

Section: Architecture Of the Esm And Formulation Of The Coupling Stramentioning

confidence: 99%

Incorporation of ice sheet models into an Earth system model: Focus on methodology of coupling

et al. 2018

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Elaboration of a modern Earth system model (ESM) requires incorporation of ice sheet dynamics. Coupling of an ice sheet model (ICM) to an AOGCM is complicated by essential differences in spatial and temporal scales of cryospheric, atmospheric and oceanic components. To overcome this difficulty, we apply two different approaches for the incorporation of ice sheets into an ESM. Coupling of the Antarctic ice sheet model (AISM) to the AOGCM is accomplished via using procedures of resampling, interpolation and assigning to the AISM grid points annually averaged meanings of air surface temperature and precipitation fields generated by the AOGCM. Surface melting, which takes place mainly on the margins of the Antarctic peninsula and on ice shelves fringing the continent, is currently ignored. AISM returns anomalies of surface topography back to the AOGCM. To couple the Greenland ice sheet model (GrISM) to the AOGCM, we use a simple buffer energy-and water-balance model (EWBM-G) to account for orographically-driven precipitation and other sub-grid AOGCM-generated quantities. The output of the EWBM-G consists of surface mass balance and air surface temperature to force the GrISM, and freshwater runoff to force thermohaline circulation in the oceanic block of the AOGCM. Because of a rather complex coupling procedure of GrIS compared to AIS, the paper mostly focuses on Greenland.

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“…The main feature of the global CH 4 flux is the establishment of different flow modes in the Northern (NH) and Southern (SH) hemispheres [3] [14] [15]. In the SH, the concentrations of CH 4 do not depend on latitude and are determined only by seasonal variations.…”

Section: Cryolithozone Of the Northern Hemisphere-a Regulator Of Meth...mentioning

confidence: 99%

The Role of Methane and Methane Hydrates in the Evolution of Global Climate

Лифшиц¹,

Spektor²,

Кершенгольц³

et al. 2018

AJCC

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For the first time, functioning of the planetary climate system is considered in terms of the self-organization laws with account of positive and negative feedbacks. It is shown that the maximum risks in the development of positive feedbacks that can lead the climate system to a planetary catastrophe, are associated with an unprecedented increase in the concentration of methane in the atmosphere. Over the last 30 years, its concentration in the atmosphere has increased by 2.5 times and continues to grow exponentially. In this review, we show that today the principal source for increase of methane concentration in the atmosphere is the self-accelerating decomposition of methane hydrates in the cryosphere of the Northern Hemisphere. In the history of the Earth, the emissions of methane into the atmosphere due to mass decomposition of methane hydrates led to climate-induced biosphere catastrophes. Paleo-reconstruction analysis of greenhouse gas concentrations in the atmosphere and its temperature over the last 420,000 years has allowed us to conclude that the self-organizing planetary climate system is currently in a state of dynamic chaos (close to the bifurcation point). This means that even a relatively weak impact on it, also of anthropogenic characters, is able to affect the planetary climate system to select its future development trajectory.

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Influence of methane sources in Northern Hemisphere high latitudes on the interhemispheric asymmetry of its atmospheric concentration and climate

Cited by 4 publications

References 10 publications

Data driven analysis of atmospheric methane concentrations as function of geographic, land cover type and season

Data driven analysis of atmospheric methane concentrations as function of geographic, land cover type and season

Incorporation of ice sheet models into an Earth system model: Focus on methodology of coupling

The Role of Methane and Methane Hydrates in the Evolution of Global Climate

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