Isopleths


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Related to Isopleths: isohyet, isoclinic lines

Isopleths

 

isograms on a graph, where values differing from the geographic coordinates are laid off along one or both coordinate axes. Topoisopleths and chronoisopleths are distinguished. Topoisopleths are plotted in profile with the distance from acertain point laid off on the x-axis and the height or depth, on the Y-axis. In this way it is possible to depict the distribution (for a certain moment or averaged over time) of moisture in soils, salinity and temperature of bodies of water, different characteristics of the atmosphere, and so on. Chronoisopleths are plotted on a graph with the following coordinates: time and height (depth, see Figure 1) or time and geographic latitude. In this way the changes with time (for certain elevations, depths, or latitudes) of the same factors are depicted. Chronoisopleths are also used to show changes in elements of the radiation balance, length of the day, and so on along the meridian.

Figure 1. Chronoisopleths of soil temperature as a function of time of year (months) and depth

References in periodicals archive ?
90%] isopleths may be sensitive to model assumptions.
Approaches to using rebuilding time isopleths without relying on uncertain estimates of rebuilding time distributions (e.
From our results, we hypothesize that rebuilding time isopleths for other species (Applegate et al.
Rebuilding time isopleths from deterministic model type 1 were quite different from isopleths (other than for median rebuilding times) from stochastic models.
Rebuilding time isopleths can be used with any type of population dynamics model.
The original rebuilding targets were derived from five-year rebuilding time isopleths calculated with a deterministic logistic growth models, but the targets incorporated estimation uncertainty by assuming the tenth percentile of the estimate of r (Cadrin, 1999; Applegate et al.
MSY] target), the simplest way to use stock-rebuilding time isopleths in designing a rebuilding plan is to choose a constant-[F.
Stock-rebuilding time isopleths can be used to monitor the progress of any rebuilding plan although interpretation is clearest with constant-F values (Cadrin, 1999).
Rebuilding isopleths provide guidance in this situation because they can be used to reject some harvest control rules based on a single necessary criterion.
1) can be used to illustrate how rebuilding time isopleths might have been used to evaluate stock-rebuilding plans for hypothetical implementation during 1996 and how stock-rebuilding time isopleths can be used to monitor progress in rebuilding overfished stocks.
1) shows that the five-year rebuilding plan, which began in 1996, was on schedule during 1996-98 because fishing mortality and estimated biomass were within the 5-year, 4-year, and 3-year isopleths during successive years.
Table 1 Six types of simulation models used to estimate rebuilding time isopleths.