| Analysis of spatio-temporal evolvement characteristics of frostless period accumulated temperature in Liaoning in recent 50 years |
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| DOI：10.7606/j.issn.1000-7601.2011.02.47 |
| Key Words: Liaoning frostless period accumulated temperature (FLPAT) spatio-temporal evolvement characteris-tics GIS technique |
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| Abstract: |
| Based on the data of daily mean temperature of Liaoning Province in the recent 50 years (1961~2007)，and using CIS technique, analysis is made of different time scale of spatio-temporal evolvement characteristics of frostless period accumulated temperature (FLPAT) in Liaoning in recent 50 years. The results demonstrate that in terms of region-al average，the FLPAT whose the largest variability is larger than 600℃·d varies evidently between years and increases significantly with a rate of increase of 85℃·d/10a in recent 50 years and mainly after 1990s. The laryest rate above90℃·d/ 10a distributes in the south of west Liaoning and south of central plain. The smallest rate below 60℃·d/ 10a distributes in most parts of east mountainous area and the west of west Liaoninq. The west of east mountainous area and northwest of west Liaoning are the places where the FLPAT increases unsignificently. Comparing the B period from 1971~2000 with the A period from 1961~1990, except for center and west of east mountainous area as well as the west of west Liaoning where the FLPAT decreases slightly， the climatology of the FIPAT which decreases progressively from south above 2 700℃·d to noth below 1 800℃·d increases in most parts of Liaoning， especially in the north of east mountainous area，most parts of west Liaoning， most parts of cental plain and part of Dalian where the rate of increase of the FLPAT above 60℃·d is the largest . In tem of interannual change, the scope area with high value of above 2 600℃·d expands to northeast from surrounding Bohai zone and reaches the peak after 2000，covering middle Liaoning， most parts of west Liaoning and north Liaoning as well as south Liaoning. |