Difference between revisions of "Climate Model"
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The climate response model affects the following variables directly: | The climate response model affects the following variables directly: | ||
| − | *The biological age or basal area | + | *The biological age or basal area depending on user setting |
*Site index (SIS) | *Site index (SIS) | ||
*Vegetation index | *Vegetation index | ||
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<math>\lambda</math> = Temperature change factor for a five-year period | <math>\lambda</math> = Temperature change factor for a five-year period | ||
<br><math>TS_{t} = \lambda \cdot TS_{t-1}</math> (temperature sum in °C) | <br><math>TS_{t} = \lambda \cdot TS_{t-1}</math> (temperature sum in °C) | ||
| − | <br><math>\Delta TS</math> = Change in temperature sum between two five-year periods | + | <br><math>\Delta TS</math> = Change in temperature sum (1000 °C) between two five-year periods<tt>:</tt> <math>0.001\ (TS_{t} - TS_{t-1})</math>) where ''t'' is period index, and |
| − | <br><math>\Delta TS2</math> = Change between squared temperature sums (in | + | <br><math>\Delta TS2</math> = Change between squared temperature sums (in 1000 °C) from period ''t''-1 to period ''t''<tt>:</tt> <math>(0.001 TS_{t})^2 - (0.001 TS_{t-1})^2</math> |
====Vegetation index change==== | ====Vegetation index change==== | ||
The vegetation index is a mapping of the categorial variable [[Definition:VegetationTypeCode | vegetation type code]], to a nominal variable. The vegetation index is used as one of the explanatory in the Whole-stand growth model (see page 39 in the [http://heurekaslu.org/mw/images/9/93/Heureka_prognossystem_(Elfving_rapportutkast).pdf "Growth modelling in Heureka" document]). | The vegetation index is a mapping of the categorial variable [[Definition:VegetationTypeCode | vegetation type code]], to a nominal variable. The vegetation index is used as one of the explanatory in the Whole-stand growth model (see page 39 in the [http://heurekaslu.org/mw/images/9/93/Heureka_prognossystem_(Elfving_rapportutkast).pdf "Growth modelling in Heureka" document]). | ||
| − | The climate model modifies the vegetation index. The vegetation index increases when the climate model predicts increased growth. The vegetation index is updated in each projection period. | + | The climate model modifies the vegetation index. The vegetation index increases when the climate model predicts increased growth. The vegetation index is updated in each projection period as a linear function of ΔTS2<tt>:</tt> |
| + | |||
| + | <math>\Delta VIX = 1.24 \cdot \Delta TS2 \cdot \frac{periodLength}{5}</math> | ||
| + | |||
====Case 1: Whole-stand growth model==== | ====Case 1: Whole-stand growth model==== | ||
Revision as of 10:38, 23 March 2016
TODO.