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Related Concept Videos

Global Climate Change01:50

Global Climate Change

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.
Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
Temperature Measurement Sites01:14

Temperature Measurement Sites

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.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Basic signals of Fourier Transform01:07

Basic signals of Fourier Transform

The Fourier Transform is a pivotal mathematical tool in signal processing, enabling the transformation of time-domain signals into their frequency-domain representations. Among the numerous elements within this domain, certain functions like the sinc function, delta function, and exponential signals hold significant importance due to their unique properties and implications.
The sinc function, defined as sinc(x) = sin(πx)/(πx), is particularly notable for its symmetry and behavior at zero. It...
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...

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Related Experiment Video

Updated: Jul 15, 2026

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
09:55

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

Published on: December 12, 2013

Low-frequency signals in long tree-ring chronologies for reconstructing past temperature variability.

Jan Esper1, Edward R Cook, Fritz H Schweingruber

  • 1Swiss Federal Research Institute WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland.

Science (New York, N.Y.)
|March 23, 2002
PubMed
Summary

Long tree-ring records are vital for understanding past climate variability and the Medieval Warm Period (MWP). Our study shows Northern Hemisphere tree-ring data can preserve multicentennial temperature trends, supporting the MWP

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Simulating Temperature in a Soil Incubation Experiment
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Published on: October 28, 2022

Area of Science:

  • Paleoclimatology
  • Climate Science
  • Dendrochronology

Background:

  • Accurate reconstruction of past climate variability is essential for understanding long-term temperature trends.
  • The Medieval Warm Period (MWP) and 20th-century warming require robust, long-term climate records for comparison.
  • Tree-ring chronologies offer a valuable proxy for reconstructing past climate conditions.

Purpose of the Study:

  • To demonstrate the capability of Northern Hemisphere extratropical tree-ring chronologies in preserving multicentennial climate variability.
  • To validate the use of tree-ring data for reconstructing temperature trends over the past 1000 years.
  • To assess the large-scale occurrence of the Medieval Warm Period using tree-ring evidence.

Main Methods:

  • Selection of 14 high-quality tree-ring chronologies from Northern Hemisphere extratropical sites.
  • Application of appropriate analytical methods to preserve large-scale, multicentennial temperature trends.
  • Averaging selected chronologies to create a composite record.

Main Results:

  • Carefully selected tree-ring chronologies can preserve coherent, large-scale, multicentennial temperature trends.
  • The developed methods ensure the preservation of critical climate variability in tree-ring data.
  • The composite tree-ring record supports the occurrence of the Medieval Warm Period across the Northern Hemisphere extratropics.

Conclusions:

  • Tree-ring records are a reliable source for reconstructing past temperature variability over multicentennial timescales.
  • The study validates the use of tree-ring data for understanding historical climate events like the MWP.
  • Findings support the large-scale nature of the Medieval Warm Period in the Northern Hemisphere extratropics.