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Global Climate Change01:50

Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
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A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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What is Climate?01:16

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Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
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Globally resolved surface temperatures since the Last Glacial Maximum.

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Climate changes over 24,000 years reveal temperature shifts driven by ice sheets, greenhouse gases, ocean circulation, and insolation. Modern warming is unprecedented in rate and magnitude compared to this paleoclimate record.

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Area of Science:

  • Paleoclimatology and Earth System Science
  • Climate modeling and data assimilation

Background:

  • Understanding past climate variability is crucial for predicting future Earth system responses to external forcing.
  • Previous studies using climate models and proxy data have yielded conflicting conclusions about past climate changes.

Observation:

  • This study integrates paleoclimate proxy data with climate model simulations using data assimilation.
  • A novel proxy-constrained, full-field reanalysis of surface temperature change from the Last Glacial Maximum to present is generated at 200-year resolution.

Findings:

  • Past 24,000 years' temperature variability was primarily driven by radiative forcing from ice sheets and greenhouse gases, alongside changes in ocean circulation and seasonal insolation.
  • Global mean temperature has steadily warmed by approximately 0.5°C since the early Holocene (around 9,000 years ago).
  • The rate and magnitude of modern warming significantly exceed those observed in the past 24,000 years.

Implications:

  • This research provides a more robust understanding of natural climate variability over millennial timescales.
  • The findings highlight the anomalous nature of contemporary anthropogenic warming in the context of long-term paleoclimate trends.
  • Results underscore the sensitivity of the Earth system to both natural and anthropogenic climate drivers.