Potential evapotranspiration and climate in Alaska by Thornthwaite"s classification
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Potential evapotranspiration and climate in Alaska by Thornthwaite"s classification by James H. Patric

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Published by Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture in Juneau, Alaska .
Written in English



  • Alaska,
  • Alaska.


  • Evaporation (Meteorology) -- Alaska.,
  • Alaska -- Climate.

Book details:

Edition Notes

Statementby James H. Patric and Peter E. Black.
SeriesUSDA Forest Service research paper PNW ;, 71
ContributionsBlack, Peter E., joint author.
LC ClassificationsSD11 .A45614 no. 71
The Physical Object
Pagination28 p.
Number of Pages28
ID Numbers
Open LibraryOL5167145M
LC Control Number74602235

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  As Thornthwaite () pointed out, wet and dry climates are determined neither by total nor seasonal precipitation but by the relation of precipitation to the evaporative demand. For example, precipitation amounts are nearly equal in California's Mojave Desert and in Alaska's forested and frequently boggy interior. In addition to estimates of potential and actual evapotranspiration, Thornthwaite ' s method provides estimates of streamflow and a quantitative method for the classifica- tion of climates. Only a few comparisons of, estimated with measured PET are known for Alaska and northwestern Canada. Patric, J.H. and P.E. Black. Potential evapotranspiration and climate in Alaska by Thorn thwaite’s classification. USD A Forest Service Research Paper PNW Pacific Northwest Forest and Range Experiment Station, Portland, OR. 28 pp. Google ScholarCited by: A Revised Thornthwaite-Type Global Climate Classification Article (PDF Available) in Physical Geography 26(6) November w Reads How we measure 'reads'.

Thornthwaite’s second classification is based on two variables: 1. Potential Evapotranspiration (PE) 2. Precipitation. The Potential Evapotranspiration is expressed as the amount of moisture that will be transferred to atmosphere by evaporation of solid and liquid water and by transpiration from living tissues, principally plants. Potential evapotranspiration (ET p) and reference crop evapotranspiration (ET o) differ in their developments, concepts, equations and application fields, however, many researchers have mixed the utilization of the two , it is necessary to clarify the terms to guide their proper usage. The aim of this study is to provide a comprehensive review of the concepts, developments, equations. Climate classification is an effort to recognize, clarify, and simplify climatic similarities and difference between geographic areas in order to enhance the scientific understanding of climates. The Alaska vegetation classification. Gen. Tech. Rep. PNW-GTR Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. p. The Alaska vegetation classification presented here is a comprehensive, statewide system that has been under development since The classification is based.

Thornthwaite's () empirical method of estimating potential evapotranspiration (PE) has been preferred by several scientists in India to Penman's () theoretical combination approach, because of the former's simplicity. However, in view of the doubts expressed in various quarters regarding the applicability of Thornthwaite's method for monsoon climates, a comparison is made of the. Based on potential evapotranspiration (potential ET or PET), which approximates use of water by climate classification based on monthly and annual averages of temperature and precipitation; boundaries between climate classes are designed so that climate types coincide with vegetation regions. tundra biome in Alaska. The cliff-forming. Thornthwaite's formulation of potential evapotranspiration (pet) as a component of the climate system was revolutionary, with applications well beyond the realm of climate classification. Koppen produced the most widely used climate classification system of the twenti eth century. He introduced his initial classification in and continued to refine. Potential evapotranspiration (PET) is one of the inputs to the Palmer Drought Severity Index (PDSI). A common approach to calculating PDSI is to use the Thornthwaite method for estimating PET becau.