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Study on Change of Northern Subtropical Border in Mountainous Regions in Western Henan Province

ZHANG Jingjing;WANG Yansong;ZHU Lianqi;GUO Lei;College of Environment and Planning,Henan University;  
Based on the January average temperature during 1964 to 2013from 27 meteorological sites in the Yuxi Mountains and around,we built the spatial database of January average temperature by using space interpolation method-ANUSPLIN.Then,with ArcGIS10.0,we got January average temperature spatial distribution of the research area.At last,we extracted the 0 ℃ isothermal curve and examined the changes of the 0 ℃ isothermal curve in the Yuxi Mountains during the last 50 years.The changes of the 0 ℃isothermal curve represent the north boundary of subtropical zone.The results showed that:1In the 50 years,the January average temperature of study area showed a weak rising trend at a rate of about 0.0376℃/10 a,but during 1964-2004,the temperature tendency rate reached 0.233℃/10 a.2In the 50 years,the north boundary of subtropical zone of study area was fluctuating.The average altitude was 477.1m,and the altitudes of 5periods were 563.4 m,510.7 m,542.3 m,716.3 m,493.5m.3According to the 111°40′E longitude as a dividing line,the study area was divided into two sections-the east and the west.In west section,the north boundary of subtropical zone changed obviously along the vertical direction.During 1964-2003,the north boundary of subtropical zone rose by 152.9maveragely,but during 2004-2013,the height declined 222.8m.During the last 50 years,the north boundary of subtropical zone in study area declined 69.9m.In east section,the north boundary of subtropical zone fluctuated obviously along the longitude line.During 1964-2003,the north boundary of subtropical zone shifted northward by about 1.2latitudes,but during 2004-2013,shifted southward about 1.1latitudes.During the last 50 years,the north boundary of subtropical zone along the longitude line almost had no change.41986 was the mutations point that temperature rose more obviously,and we studyed the northern boundary of subtropical zone how to move before and after the mutations point in 1967-2007.The northern boundary of subtropical zone was raised by 165.5maveragely.In theeast,the northern boundary of subtropical zone shifted northward about 1.5latitudes,and the northernmost boundary has reached 35°N.
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