1. Ocean Alkalinity, Buffering and Biogeochemical Processes - PMC
Following a treatment of ocean alkalinity (section 2) and sensitivity and buffer factors (section 3), we will discuss the impact of biogeochemical processes on ...
Alkalinity, the excess of proton acceptors over donors, plays a major role in ocean chemistry, in buffering and in calcium carbonate precipitation and dissolution. Understanding alkalinity dynamics is pivotal to quantify ocean carbon dioxide uptake during ...
2. [PDF] Carbon and Other Biogeochemical Cycles - IPCC
... ocean includes a yearly accumulation of anthropogenic carbon (not shown). ... Many of these processes are not yet represented in coupled climate–biogeochemistry ...
3. [PDF] The Ocean: a Carbon Pump
A schematic diagram of the global carbon cycle highlights the relative importance of each of these processes as shown ... major biogeochemical cycles, including ...
4. [PDF] Ocean Alkalinity, Buffering and Biogeochemical ... - WUR eDepot
... these are then included in the operational definition ... • Bjerrum plot: graph showing the distribution of acids and their conjugated bases as a function of pH.
5. [PDF] Guide to best practices for ocean acidification research and data ...
pH seems easy to measure and CO2 enrichment simple and straightforward. However, the reliable characterisation and manipulation of the carbonate system involves ...
6. [PDF] Controls on Carbonate System Dynamics in a Coastal Plain Estuary
... ocean acidification, has been widely reported ... Several numerical models have previously described the effects of physical and biogeochemical processes on the ...
7. [PDF] Carbon in Boreal Streams - DiVA portal
This thesis aims to unravel these sources, and promote a better consolidation of terrestrial and aquatic. C biogeochemical processes. The work is largely based ...
8. Biogeochemical Effects of Rising Atmospheric Carbon Dioxide
This ocean acidification process has already affected some marine species ... These impacts include higher sea levels and shallower oceanic mixing (right ...
The Second State of the Carbon Cycle Report (SOCCR2) provides a current state-of-the-science assessment of the carbon cycle in North America (i.e., the United States, Canada, and Mexico) and its connection to climate and society
9. [PDF] Ocean acidification due to increasing atmospheric carbon dioxide
Jun 5, 2005 · Diagram of the global carbon cycle showing sizes of carbon ... variable for marine biogeochemical processes that pervasive effects on ...
10. Earth Systems Through Time – Historical Geology - OpenGeology
The atmosphere is the gaseous envelope that surrounds our planet. Our current atmosphere can be thought of as the third atmosphere our planet has had. The ...
KEY CONCEPTS:
11. [PDF] Implementation and assessment of a model including mixotrophs - GMD
May 6, 2023 · and Hagens, M.: Ocean alkalinity buffering and biogeochemical processes, Reviews of ... in the Global Coastal Ocean, Global Biogeochemical Cycles, ...
12. [PDF] Carbon and Other Biogeochemical Cycles
has been reported for the North Atlantic ocean region alone (Watson et al ... Many of these processes are not yet represented in coupled climate ...
13. [PDF] An Updated Synthesis of the Impacts of Ocean Acidification on Marine ...
biogeochemical processes listed in Table 8.1, and assess which might be significantly altered[28]. These include aragonite and calcite saturation state, export.
14. Ocean Acidification - OSPAR - Assessments
Ocean CO2 concentration is often also reported in terms of a carbon dioxide partial pressure pCO2 (μatm). The bottom panel shows a decline in seawater pH (light ...
Every year the ocean absorb at least a quarter of the carbon dioxide (CO2) released to the atmosphere from burning of fossil fuels, cement production and land use change. This is driving ocean acidification, whereby concentrations of dissolved CO2 and hydrogen ion in seawater increase and acidity (pH) and carbonate ion concentration (CO32−) decrease. In addition, the dissolution potential (expressed as Ω, or calcium carbonate saturation state) of exposed calcium carbonate shells and skeletons is affected, leading to increased risk of dissolution of carbonate structures. Ocean acidification will impact a wide range of marine life. More acidic oceans may affect marine organisms' ability to regulate internal pH and calcifying organisms may have increased energy costs to build their calcium carbonate shells and skeletons (see Background information: Chemistry, Oceanography and Terminology ).
15. Ocean Acidification - Smithsonian Ocean
Apr 30, 2018 · A More Acidic Ocean. A graph showing rising levels of CO2 in the atmosphere over time. This graph shows rising levels of carbon dioxide (CO2) ...
The Ocean Portal Team
16. Oxygenation of the Earth aided by mineral–organic carbon preservation
Mar 6, 2023 · These reactions include photosynthesis, aerobic degradation of ... Boyd, P. W. & Ellwood, M. J. The biogeochemical cycle of iron in the ocean.
Photosynthesis produces molecular oxygen, but it is the burial of organic carbon in sediments that has allowed this O2 to accumulate in Earth’s atmosphere. Yet many direct controls on the preservation and burial of organic carbon have not been explored in detail. For modern Earth, it is known that reactive iron phases are important for organic carbon preservation, suggesting that the availability of particulate iron could be an important factor for the oxygenation of the oceans and atmosphere over Earth history. Here we develop a theoretical model to investigate the effect of mineral–organic preservation on the oxygenation of the Earth, supported by a proxy compilation for terrigenous inputs and the burial of reactive iron phases, and find that changes to the rate of iron input to the global ocean constitute an independent control on atmosphere–ocean O2 and marine sulfate levels. We therefore suggest that increasing continental exposure and denudation may have helped fuel the rise in atmospheric O2 and other oxidants over Earth history. Finally, we show that inclusion of mineral–organic preservation makes the global marine O2 reservoir more resilient to changes in nutrient levels by breaking the link between productivity and organic carbon burial. We conclude that mineral–organic preservation is an important missing process in current assessments of Earth’s long-term carbon cycle. Iron input into the ocean is a key control on mineral–organic preservation, and therefore the accumulation of oxygen in Earth’s atmosphere, according to a theoretical model and supported by proxy records for iron phases and cycling.
17. [PDF] CA Science Framework, Chapter 7 - California Department of Education
involves living processes For carbon (figure 7 2), these processes are photosynthesis ... The Carbon Cycle includes Biotic and Abiotic Processes. Source: WGBH n d.