Keeling Curve

Keeling Curve. The Keeling Curve is a graph that plots the Mauna Loa Observatory's continuous record of atmospheric carbon dioxide (CO2) concentrations, which has been maintained by Scripps Institution of Oceanography since 1958. This record was initiated by Charles David Keeling, a renowned geochemist who worked at Scripps Institution of Oceanography and is considered one of the founders of modern climate change research, along with Roger Revelle and Hans Suess. The Keeling Curve has become an iconic symbol of climate change and has been widely used by NASA, National Oceanic and Atmospheric Administration (NOAA), and the Intergovernmental Panel on Climate Change (IPCC) to track the increase in atmospheric CO2 concentrations.

Introduction

The Keeling Curve is a critical component of climate change research, providing a continuous record of atmospheric CO2 concentrations over the past several decades. This record has been maintained by Scripps Institution of Oceanography and is based on measurements taken at the Mauna Loa Observatory in Hawaii, which is operated by National Oceanic and Atmospheric Administration (NOAA). The Keeling Curve has been used by scientists such as James Hansen, Stephen Schneider, and Katherine Hayhoe to study the impact of human activities on the Earth's climate, including the effects of fossil fuel combustion, deforestation, and land use changes. The curve has also been used by organizations such as the United Nations Environment Programme (UNEP), the World Meteorological Organization (WMO), and the European Space Agency (ESA) to track the progress of climate change mitigation efforts.

History of Measurement

The measurement of atmospheric CO2 concentrations began in the 1950s by Charles David Keeling, who developed a manometer-based system to measure CO2 concentrations at the Mauna Loa Observatory. Keeling's work was supported by Roger Revelle, who was a geochemist at Scripps Institution of Oceanography and a pioneer in the field of climate change research. The measurements were initially taken using a non-dispersive infrared (NDIR) analyzer, which was later replaced by a more accurate cavity ring-down spectroscopy (CRDS) system. The Keeling Curve has been maintained by Scripps Institution of Oceanography and is now measured using a combination of in situ and remote sensing techniques, including satellite-based measurements by NASA's Orbiting Carbon Observatory (OCO) and the European Space Agency's Climate Change Initiative (CCI).

Scientific Significance

The Keeling Curve has significant implications for our understanding of climate change and the Earth's carbon cycle. The curve shows a steady increase in atmospheric CO2 concentrations over the past several decades, with a current concentration of over 415 parts per million (ppm). This increase is primarily due to human activities such as fossil fuel combustion, deforestation, and land use changes, which release large amounts of CO2 into the atmosphere. The Keeling Curve has been used by scientists such as Michael Mann, Gavin Schmidt, and Jennifer Francis to study the impact of climate change on global temperature, sea level rise, and extreme weather events. The curve has also been used by organizations such as the Intergovernmental Panel on Climate Change (IPCC), the National Academy of Sciences (NAS), and the Royal Society to inform climate change policy and mitigation efforts.

Impact on Climate Change Research

The Keeling Curve has had a significant impact on climate change research, providing a continuous record of atmospheric CO2 concentrations that has been used to study the Earth's carbon cycle and the impact of human activities on the climate. The curve has been used by scientists such as James Lovelock, Tim Flannery, and Bill McKibben to study the impact of climate change on ecosystems, biodiversity, and human health. The Keeling Curve has also been used by organizations such as the United Nations Framework Convention on Climate Change (UNFCCC), the European Union's Climate Action program, and the Australian Government's Department of the Environment and Energy to inform climate change policy and mitigation efforts. The curve has been recognized as a critical component of climate change research by awards such as the Nobel Prize in Physics and the Tyler Prize for Environmental Achievement.

Current Trends and Projections

The Keeling Curve continues to show a steady increase in atmospheric CO2 concentrations, with a current concentration of over 415 parts per million (ppm). This increase is expected to continue in the coming decades, with projections suggesting that CO2 concentrations could reach 450 ppm by 2030 and 500 ppm by 2050. The Keeling Curve has been used by scientists such as Ken Caldeira, David Archer, and Raymond Pierrehumbert to study the impact of climate change on global temperature, sea level rise, and extreme weather events. The curve has also been used by organizations such as the Intergovernmental Panel on Climate Change (IPCC), the National Oceanic and Atmospheric Administration (NOAA), and the European Space Agency (ESA) to inform climate change policy and mitigation efforts. The Keeling Curve is an important tool for tracking the progress of climate change mitigation efforts and for informing policy decisions related to climate change. Category:Climate change