Arid
DOI10.1007/s10546-010-9586-9
Critical Evaluation of Scalar Roughness Length Parametrizations Over a Melting Valley Glacier
Guo, Xiaofeng1; Yang, Kun1; Zhao, Long1,2; Yang, Wei1; Li, Shenghai1,2; Zhu, Meilin1,2; Yao, Tandong1; Chen, Yingying1
通讯作者Guo, Xiaofeng
来源期刊BOUNDARY-LAYER METEOROLOGY
ISSN0006-8314
出版年2011
卷号139期号:2页码:307-332
英文摘要

We present a field investigation over a melting valley glacier on the Tibetan Plateau. In the ablation zone, aerodynamic roughness lengths (z (0M) ) vary on the order of 10(-4)-10(-2) m, whose evolution corresponds to three melt phases with distinct surface cover and moisture exchange: snow (sublimation/evaporation), bare ice (deposition/condensation), and ice hummocks (sublimation/evaporation). Bowen-ratio similarity is validated in the stably stratified katabatic winds, which suggests a useful means for data quality check. A roughness sublayer is regarded as irrelevant to the present ablation season, because selected characteristics of scalar turbulence over smooth snow are quite similar to those over hummocky ice. We evaluate three parametrizations of the scalar roughness lengths (z (0T) for temperature and z (0q) for humidity), viz. key factors for the accurate estimation of sensible heat and latent heat fluxes using the bulk aerodynamic method. The first approach is based on surface-renewal models and has been widely applied in glaciated areas; the second has never received application over an ice/snow surface, despite its validity in (semi-)arid regions; the third, a derivative of the first, is proposed for use specifically over rough ice defined as z (0M) > 10(-3) m or so. This empirical z (0M) threshold value is deemed of general relevance to glaciated areas (e.g. ice sheet/cap and valley/outlet glaciers), above which the first approach gives notably underestimated z (0T,q) . The first and the third approaches tend to underestimate and overestimate turbulent heat/moisture exchange, respectively, frequently leading to relative errors higher than 30%. Comparatively, the second approach produces fairly low errors in energy flux estimates both in individual melt phases and over the whole ablation season; it thus emerges as a practically useful choice to parametrize z (0T,q) in glaciated areas. Moreover, we find all three candidate parametrizations unable to predict diurnal variations in the excess resistances to humidity transfer, thus encouraging more efforts for improvement.


英文关键词Bowen-ratio similarity Bulk aerodynamic method Eddy-covariance method Katabatic wind Scalar roughness length Stable boundary layer
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000289109200007
WOS关键词SURFACE-ENERGY BALANCE ; STABLE BOUNDARY-LAYER ; GREENLAND ICE-SHEET ; PARAMETERIZING TURBULENT EXCHANGE ; MIDLATITUDE GLACIER ; SEA-ICE ; EDDY-CORRELATION ; ABLATION ZONE ; TRANSFER-COEFFICIENTS ; KATABATIC WINDS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
来源机构中国科学院青藏高原研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/167464
作者单位1.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China;
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Guo, Xiaofeng,Yang, Kun,Zhao, Long,et al. Critical Evaluation of Scalar Roughness Length Parametrizations Over a Melting Valley Glacier[J]. 中国科学院青藏高原研究所,2011,139(2):307-332.
APA Guo, Xiaofeng.,Yang, Kun.,Zhao, Long.,Yang, Wei.,Li, Shenghai.,...&Chen, Yingying.(2011).Critical Evaluation of Scalar Roughness Length Parametrizations Over a Melting Valley Glacier.BOUNDARY-LAYER METEOROLOGY,139(2),307-332.
MLA Guo, Xiaofeng,et al."Critical Evaluation of Scalar Roughness Length Parametrizations Over a Melting Valley Glacier".BOUNDARY-LAYER METEOROLOGY 139.2(2011):307-332.
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