气候变化领域集成服务门户(CCPortal): Evaluation of ERA-40, NCEP-1, and NCEP-2 reanalysis air temperatures with ground-based measurements in China

CCPortal

DOI	10.1029/2007JD009549
	Evaluation of ERA-40, NCEP-1, and NCEP-2 reanalysis air temperatures with ground-based measurements in China
	Ma, Lijuan; Zhang, Tingjun; Li, Qingxiang; Frauenfeld, Oliver W.; Qin, Dahe
发表日期	2008
ISSN	2169-897X
卷号	113 期号:D15
英文摘要	We assess the correspondence of reanalysis air temperatures from ERA-40, NCEP-1, and NCEP-2 with homogenized observational data from China for 1979-2001 and 1979 2001. Results indicate that climatologies for annual ERA-40, NCEP-1, and NCEP-2 air temperatures are lower than observations by -0.93 degrees C, -2.78 degrees C, and -2.27 degrees C, respectively. Large negative differences for most of western China primarily contribute to this cool bias. Error analysis indicates that the internal coherence of ERA-40 data is better than NCEP-1 or NCEP-2. Although NCEP-2 air temperatures represent an improvement over NCEP-1, biases of NCEP-1 and NCEP-2 data relative to observations are still much larger than for ERA-40. Areas with positive/negative air temperature differences (dT) between reanalysis and observational data correspond to negative/positive elevation differences (dH). The high correlation coefficients of -0.94, -0.88, and -0.85 between d T and dH for ERA-40, NCEP-1, NCEP-2, and observations, respectively, illustrate that the air temperature differences between reanalysis data and observations are primarily related to elevation differences. Furthermore, a spatial and temporal comparison of trends also indicates that ERA-40 temperature changes correspond most closely to observed trends in China. In general, our comprehensive analysis of the three global reanalysis products indicates that, both on a seasonal and annual basis, ERA-40 temperatures correspond most closely to observations, and biases are due mainly to the elevation differences.
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158677
作者单位	Ma, LJ (corresponding author), Chinese Acad Meteorol Sci, Inst Climate & Environm, Room 801 46, Beijing 100081, Peoples R China.
推荐引用方式 GB/T 7714	Ma, Lijuan,Zhang, Tingjun,Li, Qingxiang,et al. Evaluation of ERA-40, NCEP-1, and NCEP-2 reanalysis air temperatures with ground-based measurements in China[J],2008,113(D15).
APA	Ma, Lijuan,Zhang, Tingjun,Li, Qingxiang,Frauenfeld, Oliver W.,&Qin, Dahe.(2008).Evaluation of ERA-40, NCEP-1, and NCEP-2 reanalysis air temperatures with ground-based measurements in China.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,113(D15).
MLA	Ma, Lijuan,et al."Evaluation of ERA-40, NCEP-1, and NCEP-2 reanalysis air temperatures with ground-based measurements in China".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 113.D15(2008).