Homogenization of Chinese daily surface air temperatures:An update for CHHT1.0 Li Qingxiang, Xu Wenhui, Xiaolan Wang, and coauthors (National Meteorological.

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Presentation transcript:

Homogenization of Chinese daily surface air temperatures:An update for CHHT1.0 Li Qingxiang, Xu Wenhui, Xiaolan Wang, and coauthors (National Meteorological Information Center, CMA, Inhomogenity exits in Chinese observational historic temperature data series due to stations relocation, changes of observations, calculation daily mean values, etc. One should paid careful attention on this when using the data set, we start to detect and adjust the discontinuities from about 20 years ago. 1/3 Test in daily/monthly/ annual scales PMT-with Ref/ daily Ref CHHT1.0(Dec, 2006) Recent changes Adj daily seires Climate extreme changesMean temperature changes User needs

Homogenization of Chinese daily surface air temperatures:An update for CHHT1.0 Li Qingxiang, Xu Wenhui, Xiaolan Wang, and coauthors (National Meteorological Information Center, CMA, The CHHT1.0 Dataset (1951–2004) consists of monthly and daily surface observations from all national stations in mainland China. CHHT 1.0 includes mean, maximum, and minimum temperature data; assessments of data quality; and gridded versions of the three temperature variables. 2/3 Test in daily/monthly/ annual scales PMT-with Ref/ daily Ref CHHT1.0(Dec, 2006) Recent changes Adj daily seires Climate extreme changesMean temperature changes User needs

Homogenization of Chinese daily surface air temperatures:An update for CHHT1.0 Li Qingxiang, Xu Wenhui, Xiaolan Wang, and coauthors (National Meteorological Information Center, CMA, Using both metadata and the penalized maximum t test with the first order autocorrelation being accounted for to detect changepoints, and using the quantile-matching algorithm to adjust the data time series to diminish non- climatic changes. Station relocation was found to be the main cause for non-climatic changes, followed by station automation. 3/3 Test in daily/monthly/ annual scales PMT-with Ref/ daily Ref CHHT1.0(Dec, 2006) Recent changes Adj daily seires Climate extreme changesMean temperature changes User needs

Release of the China Homogenized Historical Temperature (CHHT1.0) ( ) 4

Chinese Surface Air Temperature series over 50 years/ 100 years and its uncertainties 5 (Li and Li, 2007)

Statistics for Stations relocations from Stations numbers for Automatic observation starts during All the stations National reference/Sta ndard stations

Why update? Time duration ： CHHT1.0, , now, Metadata: more integrated, more density of stations ； Advances in techniques: annual, monthly to daily.(1 st generation to 2 nd generation) ； Raw data updated ： 2011 － 2012 ， CMA’s special project on the basic data, some missing, questionable data has been made up or corrected;(below) Requirement of data users ： CHHT1.0 users, climate change researchers.

Daily series Objective method Daily series Monthly and annual series Subjective approach 1.Metadata; 2.climate change; 3.comparason with different scales Integrated Discontinuities metadata, discontinuities in monthly and annual series No metadata, discontinuities in monthly and annual series

Temporal change of the discontinuities 最低气温平均气温

Probability density function of all QM- adjustments applied to daily Tmax and Tmin time series as necessary (a-b), and of the QM- adjustments to daily Tmax and Tmin due to relocation (c-d) and automation (e-f)

Annual mean DTR (Tmax - Tmin) 49% stations significant decrease trends