Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A line drawn on a weather map or chart linking all points of equal or constant temperature.
from The Century Dictionary.
- noun In mathematics, a curve representing phenomena which happen at constant temperature.
- noun A line connecting points on the earth's surface having the same mean temperature.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Phys. Geog.) A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.
- noun (Physics) A line on a graph connecting points representing states having the same temperature; an isothermal line.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A line of equal or constant
temperature on a graph or chart, such as a weather map.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun (meteorology) an isogram connecting points having the same temperature at a given time
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
Examples
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The treeline is generally coincident with the summer JJA 10°C isotherm, although some argue the isotherm is a response to the treeline because of albedo changes, accumulation of snow and reduced wind speeds.
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The 10C (50F) isotherm, which is cold, is within 500 meters of the 30C (86F) surface.
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There are some who argue that the isotherm is a response to the treeline not as generally assumed.
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"The well-visualized ice margin by ultrasound CT or MR is actually only the 0-degree Celsius line, or isotherm, which is not sufficiently lethal to cancer cells, but has unfortunately been confused with the actual treatment margin.
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For example, in the Polar Ural Mountains over the 90 years of study, the upper treeline rose 20 to 40 m in altitude but the June – July temperature isotherm rose 120 to 130 m.
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This means that the June – July isotherm rose 120 to 130 m in altitude (in this area the elevational temperature gradient is 0.7 °C/100 m).
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The present northern distribution coincides with the July 15°C isotherm and is likely to shift northward with climate change.
Climate change effects on arctic freshwater fish populations
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The boundary between the two is the isotherm of 72F (22C) for the warmest month.
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The weak trend in September temperatures at 2 m is largely explained by the proximity of the 0 ºC isotherm and the latent heat of the associated phase change.
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Koppen (1931) uses this line, which coincides approximately with the 50F (10C) isotherm of the warmest month, as a boundary between subarctic and tundra climates.
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