Daily precipitation amounts from 1961 to 2005 in 35 observation stations in Liaoning Province were selected in order to study the temporal and spatial distribution of extreme precipitation events.By dint of EOF,REOF,m...Daily precipitation amounts from 1961 to 2005 in 35 observation stations in Liaoning Province were selected in order to study the temporal and spatial distribution of extreme precipitation events.By dint of EOF,REOF,mean-square-error and other ways,the changes in different regions of extreme precipitation and distribution were reflected.The analysis showed that,extreme precipitation in Liaoning Province could be divided into three areas,which were western Liaoning mountains and parts of northern areas,eastern Liaoning mountainous,near-coastal areas of Liaohe River Plain.In the relatively large precipitation areas,extreme precipitation threshold was also higher,and vice versa.The lower frequency of extreme precipitation events had a greater contribution to total precipitation;extreme precipitation,total precipitation and total rain days had the greatest changes in the summer,and the least changes in the winter;number of days of extreme precipitation changes in each season were not great;the change of extreme precipitation was not obvious in the long term.展开更多
Variation characteristics of drought strength,drought frequency,drought days and drought coverage were analyzed with the daily temperature and precipitation data of 50 observation stations in Liaoning Province between...Variation characteristics of drought strength,drought frequency,drought days and drought coverage were analyzed with the daily temperature and precipitation data of 50 observation stations in Liaoning Province between 1961 and 2008.The comprehensive meteorological drought index was considered as the standard of drought division.The results showed that spring drought,summer drought and autumn drought had enlarged coverage and increasing drought strength.The coverage and strength of spring drought had the most obvious variation.The days of spring drought mainly decreased,while the days of summer and autumn drought mainly increased.The frequency of spring drought was higher in western Liaoning,while that of the three types of drought was low in eastern Liaoning.展开更多
By means of SNHT,cumulative-departure and rank test,the homogeneity test of annual mean temperature series from 48 stations in Liaoning Province from 1961 to 2008 was carried out,and the reasons for heterogencity form...By means of SNHT,cumulative-departure and rank test,the homogeneity test of annual mean temperature series from 48 stations in Liaoning Province from 1961 to 2008 was carried out,and the reasons for heterogencity formation were analyzed combining with the historical evolution data of these stations.The results showed that all of the three methods were valid for the heterogencity test of temperature series,and there was certain complement between rank test and SNHT test.Station relocation was the main reason for temperature heterogencity,and heterogencity breakpoint mainly appeared in 1970s.展开更多
Making use of the temperature data from 53 stations in Liaoning Province in April from 1961 to 2010 and the data of 500 hPa height field and sea surface temperature issued by National Climate Center,the characteristic...Making use of the temperature data from 53 stations in Liaoning Province in April from 1961 to 2010 and the data of 500 hPa height field and sea surface temperature issued by National Climate Center,the characteristics of temperature,sea surface temperature(SST) and 500 hPa height field in April in 2010 were analyzed.The results showed that the anomalously lower temperature in April in 2010 was mainly caused by the anomalous Arctic Oscillation(AO),so as to provide scientific basis for short-term climate prediction.展开更多
文摘Daily precipitation amounts from 1961 to 2005 in 35 observation stations in Liaoning Province were selected in order to study the temporal and spatial distribution of extreme precipitation events.By dint of EOF,REOF,mean-square-error and other ways,the changes in different regions of extreme precipitation and distribution were reflected.The analysis showed that,extreme precipitation in Liaoning Province could be divided into three areas,which were western Liaoning mountains and parts of northern areas,eastern Liaoning mountainous,near-coastal areas of Liaohe River Plain.In the relatively large precipitation areas,extreme precipitation threshold was also higher,and vice versa.The lower frequency of extreme precipitation events had a greater contribution to total precipitation;extreme precipitation,total precipitation and total rain days had the greatest changes in the summer,and the least changes in the winter;number of days of extreme precipitation changes in each season were not great;the change of extreme precipitation was not obvious in the long term.
基金Supported by Science and Technology Development Fund of Liaoning Provincial Meteorological Bureau (200820)
文摘Variation characteristics of drought strength,drought frequency,drought days and drought coverage were analyzed with the daily temperature and precipitation data of 50 observation stations in Liaoning Province between 1961 and 2008.The comprehensive meteorological drought index was considered as the standard of drought division.The results showed that spring drought,summer drought and autumn drought had enlarged coverage and increasing drought strength.The coverage and strength of spring drought had the most obvious variation.The days of spring drought mainly decreased,while the days of summer and autumn drought mainly increased.The frequency of spring drought was higher in western Liaoning,while that of the three types of drought was low in eastern Liaoning.
文摘By means of SNHT,cumulative-departure and rank test,the homogeneity test of annual mean temperature series from 48 stations in Liaoning Province from 1961 to 2008 was carried out,and the reasons for heterogencity formation were analyzed combining with the historical evolution data of these stations.The results showed that all of the three methods were valid for the heterogencity test of temperature series,and there was certain complement between rank test and SNHT test.Station relocation was the main reason for temperature heterogencity,and heterogencity breakpoint mainly appeared in 1970s.
文摘Making use of the temperature data from 53 stations in Liaoning Province in April from 1961 to 2010 and the data of 500 hPa height field and sea surface temperature issued by National Climate Center,the characteristics of temperature,sea surface temperature(SST) and 500 hPa height field in April in 2010 were analyzed.The results showed that the anomalously lower temperature in April in 2010 was mainly caused by the anomalous Arctic Oscillation(AO),so as to provide scientific basis for short-term climate prediction.
