Global processes  (Page 19/9)

Atmosphere and climate regulation

Life on earth plays a critical role in regulating the earth's physical, chemical, andgeological properties, from influencing the chemical composition of the atmosphere to modifying climate.

About 3.5 billion years ago, early life forms (principally cyanobacteria) helped create an oxygenatedatmosphere through photosynthesis, taking up carbon dioxide from the atmosphere and releasing oxygen ( Schopf 1983 ; Van Valen 1971 ). Over time, these organisms altered the composition of the atmosphere,increasing oxygen levels, and paved the way for organisms that use oxygen as an energy source (aerobic respiration), forming anatmosphere similar to that existing today.

Carbon cycles on the planet between the land, atmosphere, and oceans through a combination of physical,chemical, geological, and biological processes ( IPCC 2001 ). One key way biodiversity influences the composition of the earth's atmosphere is throughits role in carbon cycling in the oceans, the largest reservoir for carbon on the planet ( Gruber and Sarmiento , in press). In turn, the atmospheric composition of carbon influences climate. Phytoplankton (ormicroscopic marine plants) play a central role in regulating atmospheric chemistry by transforming carbon dioxide intoorganic matter during photosynthesis. This carbon-laden organic matter settles either directly or indirectly (after it has beenconsumed) in the deep ocean, where it stays for centuries, or even thousands of years, acting as the major reservoir forcarbon on the planet. In addition, carbon also reaches the deep ocean through another biological process -- the formation ofcalcium carbonate, the primary component of the shells in two groups of marine organisms coccolithophorids (a phytoplankton)and foraminifera (a single celled, shelled organism that is abundant in many marine environments). When these organisms die,their shells sink to the bottom or dissolve in the water column. This movement of carbon through the oceans removes excess carbonfrom the atmosphere and regulates the earth's climate.

Over the last century, humans have changed the atmosphere's composition by releasing large amounts ofcarbon dioxide. This excess carbon dioxide, along with other 'greenhouse' gases, is believed to be heating up our atmosphereand changing the world's climate, leading to 'global warming'. There has been much debate about how naturalprocesses, such as the cycling of carbon through phytoplankton in the oceans, will respond to these changes. Will phytoplanktonproductivity increase and thereby absorb the extra carbon from the atmosphere? Recent studies suggest that natural processesmay slow the rate of increase of carbon dioxide in the atmosphere, but it is doubtful that either the earth's oceans orits forests can absorb the entirety of the extra carbon released by human activity ( Falkowski et al . 2000 ).