scholarly journals Most probable transitions from metastable to oscillatory regimes in a carbon cycle system

2021 ◽  
Vol 31 (12) ◽  
pp. 121102
Author(s):  
Wei Wei ◽  
Jianyu Hu ◽  
Jianyu Chen ◽  
Jinqiao Duan
Keyword(s):  
Carbon Cycle ◽  
Cycle System

Explicit solution of fractional order atmosphere-soil-land plant carbon cycle system

2021 ◽  
Vol 48 ◽  
pp. 100966
Author(s):  
Tanfer Tanriverdi ◽  
Haci Mehmet Baskonus ◽  
Adnan Ahmad Mahmud ◽  
Kalsum Abdulrahman Muhamad
Keyword(s):  
Carbon Cycle ◽  
Fractional Order ◽  
Explicit Solution ◽  
Land Plant ◽  
Cycle System

Emergent Constraints on Climate-Carbon Cycle Projections

2020 ◽  
Author(s):  
Peter Cox
Keyword(s):  
Carbon Cycle ◽  
Radiative Forcing ◽  
Full Range ◽  
Future Climate ◽  
Climate Projections ◽  
Carbon Budgets ◽  
Transient Climate Response ◽  
Cycle System ◽  
Wide Range ◽  
Emergent Constraints

<p>Earth System Models (ESMs) are designed to project changes in the climate-carbon cycle system over the coming centuries. These models agree that the climate will change significantly under feasible scenarios of future CO<sub>2</sub>emissions. However, model projections still cover a wide range for any given scenario, which impedes progress on tackling climate change. Estimates of the Transient Climate Response to Emissions (TCRE), and therefore of remaining carbon budgets, are affected by uncertainties in the response of land and ocean carbon sinks to changes in climate and CO<sub>2</sub>, and also by continuing uncertainties in the sensitivity of climate to radiative forcing. Over the last 7 years Emergent Constraints have been proposed on many of the key uncertainties. Emergent constraints use the full range of model behaviours to find relationships between measureable aspects of present and past climates, and future climate projections. This presentation will summarise proposed emergent constraints of relevance to future climate-carbon cycle projections, and discuss the implications for the remaining carbon budgets for stabilisation at 1.5K and 2K.</p>

scholarly journals High-latitude biomes and rock weathering mediate climate–carbon cycle feedbacks on eccentricity timescales

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
David De Vleeschouwer ◽  
Anna Joy Drury ◽  
Maximilian Vahlenkamp ◽  
Fiona Rochholz ◽  
Diederik Liebrand ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
High Latitude ◽  
Phase Relationship ◽  
Deep Ocean ◽  
Phase Behaviour ◽  
Rock Weathering ◽  
Low Latitude ◽  
Cycle System ◽  
State Dependent ◽  
O Phase

Abstract The International Ocean Discovery Programme (IODP) and its predecessors generated a treasure trove of Cenozoic climate and carbon cycle dynamics. Yet, it remains unclear how climate and carbon cycle interacted under changing geologic boundary conditions. Here, we present the carbon isotope (δ13C) megasplice, documenting deep-ocean δ13C evolution since 35 million years ago (Ma). We juxtapose the δ13C megasplice with its δ18O counterpart and determine their phase-difference on ~100-kyr eccentricity timescales. This analysis reveals that 2.4-Myr eccentricity cycles modulate the δ13C-δ18O phase relationship throughout the Oligo-Miocene (34-6 Ma), potentially through changes in continental weathering. At 6 Ma, a striking switch from in-phase to anti-phase behaviour occurs, signalling a reorganization of the climate-carbon cycle system. We hypothesize that this transition is consistent with Arctic cooling: Prior to 6 Ma, low-latitude continental carbon reservoirs expanded during astronomically-forced cool spells. After 6 Ma, however, continental carbon reservoirs contract rather than expand during cold periods due to competing effects between Arctic biomes (ice, tundra, taiga). We conclude that, on geologic timescales, System Earth experienced state-dependent modes of climate–carbon cycle interaction.

The inorganic carbon cycle

2005 ◽  
Vol 33 (1) ◽  
pp. 9-12
Author(s):  
György Várallyay
Keyword(s):  
Carbon Cycle ◽  
Inorganic Carbon ◽  
Inorganic Carbon Cycle
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