全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
大气科学  2006 

半干旱地区地气界面水汽和二氧化碳通量的日变化及季节变化

DOI: 10.3878/j.issn.1006-9895.2006.01.09

Keywords: 季节变化,水汽通量,二氧化碳通量,半干旱地区,涡动相关法

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用涡动相关方法连续观测2002年10月到2003年12月半干旱地区地气界面水汽和二氧化碳通量变化,分析水汽和二氧化碳通量的季节和日变化规律,同时比较农田和退化草地两种不同下垫面物质和能量通量交换过程的差异,得到如下一些主要结果:(1)半干旱地区湿季,相距5km的两种不同下垫面,即使在同一天气过程控制下,不同植被下垫面的降雨分布仍不尽相同,甚至相差很大.这表明降雨空间的分布是很不均匀的,具有很强的局地特征.(2)在干季近地面层能量收支中,两种不同下垫面上的有效能量(净辐射与地表热流量之差)主要分配为感热通量,潜热通量在非生长季(干季)通常很小.在湿季(生长季),潜热通量与感热通量相当,但农田下垫面的潜热通量大于退化草原下垫面.(3)土壤的温度和湿度日变化主要集中在0~20cm土壤层内,在湿季农田下垫面土壤的湿度有明显的跳跃,这与降雨过程有很好的相关.(4)在非生长季,两种不同下垫面地气间二氧化碳通量差别不大,都很小.白天由于光合作用,在生长季农田下垫面吸收CO2通量较退化草原大,但比湿润地区稻田下垫面小一个量级,远小于森林生态系统.

References

[1]  王介民.陆面过程实验和地气相互作用研究--从HEIFE到IMGRASS和GAME-TIBET/TIPEX.高原气象,1999,18(3):281~294.Wang Jiemin.Land surface process experiments and interaction study in China-from HEIFE to IMGRASS and GAMETIBET/TIPEX,Plateau Meteorology (in Chinese),1999,18(3):281~294
[2]  Baldocchi D,Falge E,Gu Lianhong,et al.FLUXNET:A new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide,water vapor and energy flux densities.Bull.Amer.Meteor.Soc.,2001,82(11):2415~2434
[3]  http://www.chinaflux.org
[4]  Veenendaal E M,Kolle O,Lloyd J.Seasonal variation in energy fluxes and carbon dioxide exchange for a broad-leaved semi arid savanna (Mopane Woodland)in Southern Africa.Global Change Biology,2004,10:318~328,doi:10.1046/j.1529-8817.2003.00699.x
[5]  Scott R L,Edwards E A,Shuttleworth W J,et al.Interannual and seasonal variation in fluxes of water and carbon dioxide from a riparian woodland ecosystem.Agric.For.Meteor.,2004,122(1):65~84
[6]  Baldochi D,Xu L,Kiang N.How plant functional-type,weather,seasonal drought,and soil physical properties alter water and energy fluxes of an oak-grass savanna and an annual grassland.Agric.For.Meteor.,2004,123(1):13~39
[7]  胡隐樵,高由禧.黑河实验(HEIFE)--对干旱区陆面过程的一些新认识.气象学报,1994,52(3):285~296Hu Yinqiao,Gao Youxi.Some new understandings of processes at the land surface in arid area from the HEIFE.Acta Meteorologica Sinica (in Chinese),1994,52(3):285~296
[8]  吕达仁,陈佐忠,陈家宜,等.内蒙古半干旱草地土壤-植被-大气相互作用(IMGRASS)综合研究.地学前缘,2002,9(2):295~306L?Daren,Chen Zuozhong,Chen Jiayi,et al.Composite study on Inner Mongolia semi-arid grassland soil-vegetationatmosphere interaction (IMGRASS).Earth Science Frontiers,2002,9(2):295~306
[9]  张强,卫国安,黄荣辉.西北干旱区荒漠戈壁动量和感热总体输送系数.中国科学,2001,31(9):783~792 Zhang qiang,Wei Guoan,Huang Ronghui.Bulk transfer coefficients of the atmosphere momentum and sensible heat over desert and Gobi in arid climate region of Northwest China.Science in China (in Chinese),2001,31(9):783~792
[10]  http://www.chinaflux.org
[11]  Webb E K,Pearman G I,Lenning R.Correction of flux measurements for density effects due to heat and water vapour transfer Quart.J.Roy.Meteor.Soc.,1980,106:85~100
[12]  Gao Zhiqiu,Bian Lingen,Zhou Xiuji.Measurements of turbulent transfer in the near-surface layer over a rice paddy in China.J.Geophys.Res.,2003,108(D13):4387~4399
[13]  Saigusa N,Oikawa T,Liu Sba.Seasonal variations of the exchange of CO2 and H2 O between a grassland and the atmosphere:An experimental study.Agric.For.Meteor.,1998,89(1):131~139
[14]  符淙斌,温刚.中国北方干旱化的几个问题.气候与环境研究,2002,7(1):22~29Fu Congbin,Wen Gang.Several issues on aridification in the northern China.Climatic and Environmental Research (in Chinese),2002,7(1):22~29
[15]  Bosilovich M G,lawford R.Coordinated Enhanced Observation Period (CEOP) international workshop.Bull.Amer.Meteor.Soc.,2002,83(10):1495~1499
[16]  http://www.ceop.net
[17]  刘辉志,董文杰,符淙斌,等.半干旱地区吉林通榆"干旱化和有序人类活动"长期观测实验.气候和环境研究,2004,9(2):378~389Li Huizhi,Dong Wenjie,Fu Congbin,et al.The long term field experiment on aridification and the ordered human activity in semi arid area at Tongyu,Northeast China.Climatic and Environmental Research (in Chinese),2004,9(2):378~389

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133