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Author Topic: Carbon Cycle  (Read 157710 times)

DrTskoul

  • Nilas ice
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Re: Carbon Cycle
« Reply #500 on: July 25, 2019, 12:00:11 PM »
Thanks Vox!

This looks like another chunk out of the budget?

And this makes me wonder about how climate models actually interact with soils...

They interact with as much data and knowledge we have...which means not a lot ....

bligh8

  • Frazil ice
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Re: Carbon Cycle
« Reply #501 on: August 18, 2019, 05:10:42 PM »
Ice sheets matter for the global carbon cycle

J. L. Wadham, J. R. Hawkings, L. Tarasov, L. J. Gregoire, R. G. M. Spencer, M. Gutjahr, A. Ridgwell & K. E. Kohfeld .. open access, nice paper

Abstract

The cycling of carbon on Earth exerts a fundamental influence upon the greenhouse gas content of the atmosphere, and hence global climate over millennia. Until recently, ice sheets were viewed as inert components of this cycle and largely disregarded in global models. Research in the past decade has transformed this view, demonstrating the existence of uniquely adapted microbial communities, high rates of biogeochemical/physical weathering in ice sheets and storage and cycling of organic carbon (>104 Pg C) and nutrients. Here we assess the active role of ice sheets in the global carbon cycle and potential ramifications of enhanced melt and ice discharge in a warming world.

" Only in the last 15 years have glacial systems started to be considered as active cyclers of carbon, arising from the discovery that they include a range of aquatic environments4 which host abundant and diverse populations of microorganisms5 and are hot spots for biogeochemical weathering6. These processes create the potential for ice sheets to directly or indirectly impact the global carbon cycle (Fig. 1). Direct impacts include the release of greenhouse gases (carbon dioxide, CO2 and methane, CH4) during the microbial respiration of organic matter (OM) stored within ice sheets. Examples of indirect impacts include the fertilisation of downstream ecosystems, promoted by either the release of nutrient-rich glacial meltwaters7,8,9 or by subglacial meltwater-induced upwelling of nutrient replete marine water at tidewater glacier margins10,11,12,13,14. Ocean fertilisation by glaciers may be accompanied by significant CO2 drawdown by phytoplankton, intensifying the biological pump15,16."

kassy

  • Grease ice
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Re: Carbon Cycle
« Reply #502 on: August 18, 2019, 06:19:26 PM »
Þetta minnismerki er til vitnis um að við vitum hvað er að gerast og hvað þarf að gera. Aðeins þú veist hvort við gerðum eitthvað.

bligh8

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Re: Carbon Cycle
« Reply #503 on: August 19, 2019, 04:17:21 PM »
nice response .. and, Your Very Welcome