seasonal variation

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seasonal variation

[′sēz·ən·əl ‚ver·ē′ā·shən]
(geophysics)
The variation of any parameter of the upper atmosphere with season; for example, the variation of ion densities of different parts of the ionosphere, and the resulting variation in transmission of radio signals over large distances.
References in periodicals archive ?
The National Price Monitoring Committee (NPMC) reported on Thursday that a recent spike in the prices of perishable goods was primarily due to seasonal variations, the impact of which is now subsiding.
The survey, having much bigger coverage (200 locations) in two rounds, would cater seasonal variations of the traffic patterns.
Also, the company provided market outlook for Q1 2019 and expects demand to be on a par with, or somewhat lower than, the fourth quarter of 2018, adjusted for seasonal variations.
Caldwell & Peters (2009) have investigated seasonal variations in fitness among semi-professional football players and found significant decline in the level of fitness from the end of the season to the beginning of the new one.
The patients presenting in different four seasons September to November as autumn, December to February as winter, March to May as spring, June to August as summer, were compared to determine seasonal variations.
Another team of scientists, led by Christopher Webster from the California Institute of Technology, presented evidence that methane concentrations detected on Mars follow strong seasonal variations. The seasonal variation provides an important clue for determining the origin of martian methane.
"While earlier studies have shown seasonal variations for other cardiac conditions, this is the first time we found an impressive pattern of seasonal variation in hospitalizations in the U.S.
Saul Shiffman, Ph.D., from Pinney Associates in Pittsburgh, and colleagues estimated the prevalence of excess intake of acetaminophen as well as seasonal variations in acetaminophen intake using data from 14,481 U.S.
Existing literature has shown seasonal variations in the rates of hospital admissions for MDD across the world.
Physiological adjustments to seasonal variations of the environment, such as changes in body mass and energy metabolism, are important adaptive strategies for small mammals.
A similar pattern in HbA1c and glucose levels has been reported in diabetes patients, possibly because of seasonal variations in environmental conditions, such as diet and exercise [3-6].

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