Suzanne B. Hodgkins et al. Tropical peatland carbon storage linked to global latitudinal trends in peat recalcitrance. Nature Communications. volume 9, A3640 (2018)
Peatlands represent large terrestrial carbon banks. Given that most peat accumulates in boreal regions, where low temperatures and water saturation preserve organic matter, the existence of peat in (sub)tropical regions remains enigmatic. Here we examined peat and plant chemistry across a latitudinal transect from the Arctic to the tropics. Near-surface low-latitude peat has lower carbohydrate and greater aromatic content than near-surface high-latitude peat, creating a reduced oxidation state and resulting recalcitrance. This recalcitrance allows peat to persist in the (sub)tropics despite warm temperatures. Because we observed similar declines in carbohydrate content with depth in high-latitude peat, our data explain recent field-scale deep peat warming experiments in which catotelm (deeper) peat remained stable despite temperature increases up to 9 °C. We suggest that high-latitude deep peat reservoirs may be stabilized in the face of climate change by their ultimately lower carbohydrate and higher aromatic composition, similar to tropical peats.
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“Batten down the hatches! A tsunami of global warming and “clean energy” propaganda is approaching! San Francisco is hosting the September 12-14 Global Climate Action Summit, a massive event at which “international and local leaders from states, regions, cities, businesses, investors and civil society … will be joined by national government leaders, scientists, students, nonprofits and others … [to share] what they have achieved to date and commit to doing more to usher in the era of decarbonization.” ” click here
” ‘If all human CO2 emissions were stopped and nature remained constant, the level of carbon dioxide in our atmosphere would fall by only 18 ppm. Nature’s level of 392 ppm would remain.’ ” click here
“Take a wild guess what country is reducing its greenhouse gas emissions the most? Canada? Britain? France? India? Germany? Japan? No, no, no, no, no and no.” click here
Jianghui Du, Brian A. Haley, Alan C. Mix, Maureen H. Walczak & Summer K. Praetorius. Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations Nature Geoscience (2018)
During the last deglaciation (19,000–9,000 years ago), atmospheric CO2 increased by about 80 ppm. Understanding the mechanisms responsible for this change is a central theme of palaeoclimatology, relevant for predicting future CO2 transfers in a warming world. Deglacial CO2 rise hypothetically tapped an accumulated deep Pacific carbon reservoir, but the processes remain elusive as they are underconstrained by existing tracers. Here we report high-resolution authigenic neodymium isotope data in North Pacific sediment cores and infer abyssal Pacific overturning weaker than today during the Last Glacial Maximum but intermittently stronger during steps of deglacial CO2 rise. Radiocarbon evidence suggestive of relatively ‘old’ deglacial deep Pacific water is reinterpreted here as an increase in preformed 14C age of subsurface waters sourced near Antarctica, consistent with movement of aged carbon out of the deep ocean and release of CO2 to the atmosphere during the abyssal flushing events. The timing of neodymium isotope changes suggests that deglacial acceleration of Pacific abyssal circulation tracked Southern Hemisphere warming, sea-ice retreat and increase of mean ocean temperature. The inferred magnitude of circulation changes is consistent with deep Pacific flushing as a significant, and perhaps dominant, control of the deglacial rise of atmospheric CO2.
“New reports show that greenhouse gas emissions are plunging in the United States and rising in Europe—and the drop in the U.S. is due to falling costs of renewable energy and natural gas.” click here
“The United States and Western democracies as a whole are increasingly minor players among global carbon dioxide emitters, U.S. EPA data show. Without dramatic emissions reductions in China, India, and other developing nations, dramatic reductions in the United States, Western Europe, and Japan will have little impact on global carbon dioxide emissions.” click here