The carbon budget of the northern cryosphere region
نویسندگان
چکیده
The northern cryosphere is undergoing substantial warming of permafrost and loss of sea ice. Release of stored carbon to the atmosphere in response to this change has the potential to affect the global climate system. Studies indicate that the northern cryosphere has been not only a substantial sink for atmospheric CO2 in recent decades, but also an important source of CH4 because of emissions from wetlands and lakes. Analyses suggest that the sensitivity of the carbon cycle of the region over the 21st Century is potentially large,but highly uncertain because numerous pathways of response will be affected by warming. Further research should focus on sensitive elements of the carbon cycle such as the consequences of increased fire disturbance, permafrost degradation, and sea ice loss in the northern cryosphere region.
منابع مشابه
Radiative forcing and albedo feedback from the Northern Hemisphere cryosphere between 1979 and 2008
The extent of snow cover1 and sea ice2 in the Northern Hemisphere has declined since 1979, coincident with hemispheric warming and indicative of a positive feedback of surface reflectivity on climate. This albedo feedback of snow on land has been quantified from observations at seasonal timescales3–6, and century-scale feedback has been assessed using climate models7–10. However, the total impa...
متن کاملEffects of Topographic Factors on Carbon Sequestration in Astragalus Gossypinus (Case Study of Bazan Region, Kermanshah Province)
Increasing the concentration of atmospheric carbon dioxide is the main factor for the climatic change having some harmful consequences for the human health while there is no considerable effort for decreasing this accelerated global problem, yet. Kermanshah province located in the west of Iran has about 1,200,000 ha rangeland which is dominated by Astragalus sppas the more frequent shrub beinga...
متن کاملEffect of Agronomic Practices on the Aggregate Stability and Organic Carbon of soil (Case study: the Northern of Aq Qala)
متن کامل
Estimating daytime CO2 fluxes over a mixed forest from tall tower mixing ratio measurements
[1] Difficulties in estimating terrestrial ecosystem CO2 fluxes on regional scales have significantly limited our understanding of the global carbon cycle. This paper presents an effort to estimate daytime CO2 fluxes over a forested region on the scale of 50 km in northern Wisconsin, USA, using the tall-tower-based mixed layer (ML) budget method. Budget calculations were conducted for 2 years u...
متن کاملObservations and Projections: Cryosphere, Ocean Dynamics, and Hydrology
4. Observations and Projections: Cryosphere, Ocean Dynamics, and Hydrology Introduction 4.1 The Cryosphere 4.1.1 Antarctica 4.1.2 Greenland and Eurasian Ice Caps 4.1.3 Montane Glaciers 4.1.4 Sea and Lake Ice 4.2 Ocean Dynamics 4.2.1 Sea Level Change 4.2.2 Ocean Heat 4.2.3 Ocean Circulation 4.2.4 Africa 4.2.5 South America 4.2.6 Antarctica 4.2.7 Northern Hemisphere 4.2.8 Miscellaneous 4.3 Precip...
متن کامل