干旱区生态环境知识资源中心(Arid): 基于敦煌戈壁站观测对几套再分析产品夏季地表感热通量的评估

Arid

	基于敦煌戈壁站观测对几套再分析产品夏季地表感热通量的评估
其他题名	Evaluation of Summer Sensible Heat Flux in Multi-reanalysis Products Based on Measurements at Dunhuang Gobi Site
	王典 1; 周德刚 2; 黄荣辉 2; 范广洲 1
来源期刊	气候与环境研究
ISSN	1006-9585
出版年	2017
卷号	22 期号:5 页码:601-612
中文摘要	西北干旱区是欧亚大陆夏季感热输送的高值区,此区域感热输送对东亚季风气候系统的变异有重要影响。然而,再分析资料的感热通量在此区域存在很大的不确定性,影响该地区感热变化对东亚区域气候影响的认识。本文基于敦煌戈壁站2001~2014年夏季的观测数据,评估了NCEP/NCAR、NCEP/DOE、ERA-Interim和JRA-55这4套再分析产品的感热通量。敦煌戈壁站的感热通量是根据敦煌戈壁站常规观测数据和Y08方案计算得到,代表敦煌戈壁站的实际感热。结果显示,戈壁站夏季感热多年平均约为85.7 Wm~(-2),但受局地降水的影响存在较大的波动;再分析资料的感热通量之间存在很大的不确定性,与观测相比,ERA-Interim的感热通量在大小和变化上好于其他再分析资料,在没有局地性降水的影响时比较接近观测。进一步分析了再分析感热与观测差异的原因。研究表明,再分析资料中的地表风速和地气温差与粗糙度设置和热力参数化方案相关联。各再分析资料均不同程度地低估了敦煌戈壁站的地气温差(观测值约6.5 ℃),这主要是由于再分析系统中对戈壁下垫面的粗糙度设置偏高以及热力参数化方案不太适用于戈壁下垫面造成的。相对而言,ERA-Interim的参数化方案在戈壁下垫面优于其他再分析产品的参数化方案,使得ERA-Interim的地气温差相对其他再分析资料更接近实际观测,感热通量较为合理。
英文摘要	The arid region of Northwest China is one of the regions with strong summer surface sensible heat flux transfer in Eurasia. Surface sensible heat flux over this arid region plays an important role in the variation of the East Asian monsoon system. However, large uncertainties in summer sensible heat flux over this region have been found in various reanalysis datasets, which hinders our exact understanding of its climatic influence on the East Asian monsoon system. Using the summer measurements from 2001 to 2014 at Dunhuang Gobi site, this paper evaluated summer sensible heat fluxes in four reanalysis datasets including NCEP/NCAR, NCEP/DOE, ERA-Interim, and JRA-55. Sensible heat flux observations at Dunhuang Gobi site were derived from routine meteorological observations combined with a reasonable surface flux parameterization scheme (Y08 scheme). The results indicate that the average summer sensible heat flux at this site is about 85.7 W m~(-2), while its variation range is large due to the influence of local rainfall. There exist certain differences in the sensible heat flux among different reanalysis datasets. Compared with the observations, the sensible heat flux from the ERA-Interim is the best in both the magnitude and variation, and agrees well with observations when there is no local rainfall influence. The reasons for the uncertainty in sensible heat flux in the four reanalysis /ducts and the differences between reanalysis and observations were investigated. Surface wind speed and differences between surface skin temperature and air temperature are associated with the specification of roughness and surface flux parameterization scheme. The difference between surface skin temperature and air temperature in the reanalysis /ducts was much smaller than the observation (6.5 ℃) mainly due to the unrealistically high value of roughness and inap/priate parameterization scheme for the Gobi surface in these reanalysis /ducts. The parameterization scheme of ERA-Interim is relatively better than those of others in that the difference between surface skin temperature and air temperature is close to observations, which results in a relatively reasonable estimation of sensible heat flux.
中文关键词	感热通量 ; 西北干旱区 ; 再分析资料 ; 戈壁下垫面
英文关键词	Sensible heat flux Arid region of Northwest China Reanalysis datasets Gobi surface
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6071328
来源机构	中国科学院大气物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236374
作者单位	1.成都信息工程大学大气科学学院, 成都, 四川 610225, 中国; 2.中国科学院大气物理研究所季风系统研究中心, 北京 100190, 中国
推荐引用方式 GB/T 7714	王典,周德刚,黄荣辉,等. 基于敦煌戈壁站观测对几套再分析产品夏季地表感热通量的评估[J]. 中国科学院大气物理研究所,2017,22(5):601-612.
APA	王典,周德刚,黄荣辉,&范广洲.(2017).基于敦煌戈壁站观测对几套再分析产品夏季地表感热通量的评估.气候与环境研究,22(5),601-612.
MLA	王典,et al."基于敦煌戈壁站观测对几套再分析产品夏季地表感热通量的评估".气候与环境研究 22.5(2017):601-612.