Global Biogeochemical Cycles

Delivery of carbon. nitrogen, and sulphur to the silicate Earth by a giant impact

Xenon isotopes tell the story of volatiles in Earth's mantle 

There and back again: mantle xeon has a story to tell

Measuring, monitoring & modeling ecosystem cycling

Carbon and other biogeochemical cycles

The Global Water Cycle:

Water cycle video     Water cycle diagram   Where is Earth's water?    Water is always on the move

Cryosphere   Ice Caps   Ice Sheets   Glaciers   Moraines    Definition from Wikipedia    

CMIP5 update of 'Inter-modal variability and biases of the global water cycle in CMIP3 coupled climate models'

A simple explanation for the sensitvity of the hydrological cycle to surface temperature and solar radiation and its implications for global climate change

Assessment of transbboundary aquifers of the world - vulnerability arising from human water use

The recycling rate of atmospheric moisture over the past two decades (1988–2009)

Limits to the impact of empirical correction on simulation of the water cycle

WATCH Project: researchers put new spin on world's water cycle

In measuring gas exchange between water and air, size matters

New ORNL tool developed to assess global freshwater stress

Hydrology research provides 'missing link' in water modeling

Global significance of the changing freshwater carbon cycle

Earth's water cycle intensifying with atmospheric warming

Improving understanding of the Global Hydrological Cycle

How much modification can Earth's water cycle handle?

Trees' surprising role in the boreal water cycle quantified

NASA estimates 'liquid assets' of world's water budget 

Many water cycle diagrams promote misconceptions

A graceful way to study daily water storage on land 

Fault actvity linked to seawater entering the Earth

Water flow to the oceans under the land surface

The water cycle amplifies abrupt climate change

Climate models overestimate rainfall increases

New technology to monitor African water cycle

How irrigation in Asia affects rainfall in Africa

Big uncertatinties in the global water budget

Feature story from NASA on the water cycle

The ocean and the global water cycle  

olcanoes deliver two flavors of water

Targeting water cycles in deep Earth

The Blue Planet's new water budget

An oceanographer and the water

Water in a changing world    

Deep-Earth chemistry    

With a grain of salt  

Woods Hole

The Global Carbon Cycle:

Carbon cycling

Reducing carbon

Global carbon atlas

NASA - carbon cycle

How life alters climate

The carbon dioxide loop 

3D carbon goes metallic

US Carbon footprint maps  

Carbon goes with the flow 

Global Carbon Budget 2014

Global Carbon Budget 2019

Are we headed for a sixth extinction?

Scientists tackle the carbon conundrum

Ironing out the details of the carbon cycle

Tracing the path of carbon in North America

Extreme weather, climate and the carbon cycle

Focus on extreme events and the carbon cycle

How and when was carbon distributed on Earth? 

OCO-2 global visualization (Sept 2014-Sept 2015)

What's the carbon footprint of my favorite product?

Basalts turn CO2 into stone for permanent storage

The future of the carbon cycle in a changing climate

New measurement device: CO2  as geothermometer

Mountain streams exhale more than their share of CO2

Microbial influences on subduction zone carbon cycling

Carbon seen bonding with six other atoms for the first time 

Reducing uncertainty in projections of terrestrial carbon uptake

Shrinking the carbon footprint of a chemical in everyday oblects

Improving carbon cycle projections for better carbon management

Historical rainfall levels are significant in carbon emissions from soil

Research reveals how global warming will impact Earth's carbon cycle

Sensitivity of carbon cycle to tropical temperature variations has doubled

Scientists quantify global volcanic CO2 venting: estimate total carbon Earth

New study illuminates 55 million years of the carbon cycle and climate history

Life on the thermodynamic edge: respiratory growth of an acetotrophic methanogen

New insights about carbon and ice could clarify inner workings of Earth, other planets   

Interactions of the carbon cycle, human activity, and the climate system: a research portfolio

The topology of non-linear global carbon dynamics: from tipping points to planetary boundaries 


A 2500 square-mile methane plume is silently hovering over the Western USA

Pre-industrial rise in methane gas had natural and anthropogenic causes

Global methane emissions have risen nearly 10% over the last 20 years

Audio reveals sizes of methane bubbles rising from the seafloor 

Scientists report breakthrough in detecting methane

Unexpected natural source of methane discovered

Study identifies prime source of ocean methane

Origin of massive methane reservoir identified

Masses of methane from mud volcanoes

New key players in the methane cycle

Methane hydrates and global warming

Global methane budget 2020

Atmospheric carbon:

CarbonTracker free tropospere CO2 

Carbon's role in atmosphere formation       

Status of black carbon monitoring in ambient air in Europe

Symbiotic fungi inhabiting plant roots have major impact on atmospheric carbon

Soil carbon:

Submicron structures provide preferential spots for carbon & nitrogen sequestration in soils

Soil in newly forested areas store substantial carbon that could offset climate change

Climate warming may not drive net losses of soil carbon from tropical forests

Scientists discover carbonate rocks are unrecognized methane sink

Lazy microbes are key for soil carbon and nitrogen sequetsration

Dryland ecosystems emerge as driver in in global carbon cycle

Tropical ecosystems regulate variations in Earth's CO2 levels

Loss of soil carbon due to climate change will be 'huge'

Exploring the fate of the Earth's storehouse of carbon

Researchers improve soil carbon cycling models

Buried fossil soils found to be awash in carbon

Funghi may determine the future of soil carbon

The missing link in carbon accounting

Carbon buried in the soil rises again

Soil carbon 'blowing in the wind'

How does soil store CO2?    

Carbon in plants & forests:

Watching the planet breathe

Short-circuiting the biological pumps

The Earth has lungs. Watch them breathe

Cover crops sequester soil organic carbon

Mapping blue carbon in mangroves worldwide

New forest land classification data set launched

Northern forests falter in combating climate change

Carbon-trapping 'sponges' can cut greenhouse gases

'Green revolution' changes breathing of the biosphere

Crops play a major role in the annual CO2 cycle increase

4 degree temperature rise will end vegetation 'carbon sink' 

Forest carbon stocks have been overestimated for 50 years  

What agricultural 'ecosystems on steroids' are doing to the air

Plants are a bridge that connect atmospheric carbon with soil carbon

Rivers & carbon:   

Amazon River exhales virtually all carbon taken up by the rain forest

Mountain streams exhale more than their share of CO2

Mountain streams emit a surprising amount of CO2

'Black carbon' flowing from the soil to the oceans

What role do rivers play in the carbon cycle? 

River buries permafrost carbon at sea

Ocean carbon:  

Carbon below the sea floor

Vast carbon residue of ocean life

Fjords are 'hotspots' in global carbon cycling

Ocean food web is key to global carbon cycle

The ups and downs of the ocean's carbon sink    

Scientists solve the riddle of deep ocean carbon

Pacific stores CO2 at depths of thosands of metres 

Southern Ocean absorbs less than previously thought

Black carbon is ancient by the time it reaches seafloor

New view of how ocean 'pumps' impact climate change

Sunlight stimulates brown algae to release organic carbon

Molecuar-level relationships key to deciphering ocean carbon

Microscopic organism plays a big role in ocean carbon cycling 

As oceans warm, microbes could pump more CO2 back into air

New research helps solve the riddle of the ocean carbon conundrum

Synchrotron sheds (X-ray) light on carbon chemistry at ocean surfaces

Largest mapping of breathing ocean floor key to understanding global carbon cycle

First direct measurements of Pacific seabed sediments reveal strong methane source

Long-term cycles in the carbon reservoir of the Quaternary ocean: a perspective from the South China sea

Radiocarbon constraints on the extent and evolution of the South Pacific glacial carbon pool

The marine carbon system and ocean acidification during Phanerozoic Time

Spaceborne carbon:

Spaceborne carbon counter maps new details

Deep subsurface carbon:

Carbon in Earth 

Carbon Cycle at Depth

'Carbon sink' detected underneath world's deserts

Deep-Earth carbon offers clues about origin of life on Earth   

Most of Earth's carbon may be hidden in the planet's inner core, new model suggests

SFA2.0 project explores unchartered environmental frontier of subsurface ecogenomics

Arctic/Antartic carbon:

Sunlight, not microbes, key to CO2 in Arctic    Artic sea ice helps remove CO2 from the atmosphere

Surface water inundation in the boreal-Arctic: potential impacts on regional methane emissions

Arctic seafloor methane releases double previous estimates

Carbon & animals:

Carbon models underestimate role of animals   

The Global Oxygen & Ozone Cycle:

Researchers descibe oxygen's different shapes    Scripps O2 program

O2 dropping faster than CO2 rising    Warming oceans starved of oxygen    

Ozone does not necessarily promote decline of natural ecosystems

Thunderstorms helping bring ozone down to Earth

Tracking tropospheric ozone since 1979 

On the changing role of the stratosphere on the tropospheric ozone budget: 1979-2010

The Global Nitrogen Cycle: 

Global nitrogen availability consistent for past 500 years, linked to carbon levels

To save the Earth, better nitrogen use on a hungrier planet must be addressed

Ocean source of the greenhouse gas Nitrogen has been underestimated

Continental microbes helped seed ancient seas with notrogen

Going against the grain - nitrogen turns out to be hypersociable

A new mechanism for nitrogen cycing in the Southern Ocean

Nitrogen factories in the Cretaceous oceans    Mystery of Earth's missing nitrogen solved

Humans adding less nitrogen to oceans than models predict

No laughing matter, nitrous oxide rose at end of last ice age

Nitrogen footprints: past, presnt and future     Forests lose nitroge in surprising ways

Nitrogen fingerpprint in biomolecules and extraterrestrial objects could be from early Sun

How much nitrogen is fixed in the ocean?    Change in Pacific nitrogen content tied to climate change  

Natural reasons behind nitrogen-rich forests    The surface of the sea is a sink for nitrogen oxides at night

Excess nitrogen in the US environment - trends, risks and solutions

Cost of reactive nitrogen release from human activities to the environment in the USA

Complex relationship between phosphorous levels and nitrogen removal in lakes

Inventories and scenarios of nitous oxide emissions

The world's nitrogen fixation, explained

Study finds wide-reaching impact of nitrogen deposition on plants

Characteristics and transformations of of dissolved organic nitrogen in municipal biological nitogen removal wastewater treatment plants

First approach to the Japanese nitrogen footprint model to predict the loss of nitrogen to the environment 

30-year changes in the nitrogen inputs to the Yangtze River basin

Local and social facets of planetary boundaries: right to nutrients

The Global Phosphorous Cycle:

After decades of clean-up attempts, world's lakes still suffer from phosphorous pollution

Life's first taste of phosphorous     Oxygen, phosphorous and early life  on Earth

Biochemical fossil shows how life may have emerged without phosphate

The Phosphorous Index: changes afoot    Soil determines fate of phosphorous

Local and social facets of planetary boundaries: right to nutrients

Fertilzer's legacy: taking a toll on land and water

Total Phosphorous (TP) in European lakes

Embodied phosphorous and the global connections of US agriculture

The Global Sulphur Cycle: 

A shortcut in the global sulphur cycle

Fool's gold found to regulate oxygen

Earth on Acid: the present and future of Global Acidification

NASA satellite sees increase of India's sulfur dioxide emissions

Dimethyl sulphide (DMS) is the little gas raising big questions for our planet

New understanding of modern climate change as implications for early Earth's evolution

The Global Iron cycle:

Combustion iron distribution and deposition

Sources, transport and deposition of iron in the global atmosphere

Atmospheric iron deposition in the northwest Pacific Ocean and its adjacent seas - importat coal burning

Particle-size variability of aerosol iron, impact on iron solubility and dry deposition fluxes to the Arctic Ocean

The Global Manganese Cycle:

Morphing manganese 

Other Global Cycles:

Oceans may be large, overlooked source of hydrogen gas

How much hydrogen is consumed by ocean-floor microbes?

Atmospheric transport of trace elements and nutrients to the oceans  

Minerals from PNG hold secret for recycing of nobel gases between deep Earth and atmosphere