中美半干旱區(qū)長期地表通量序列的構(gòu)建及檢驗

doi:10.3969/2013jms.0041

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中美半干旱區(qū)長期地表通量序列的構(gòu)建及檢驗
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                        10.3969/2013jms.0041
                    
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基金項目:國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2011CB952004)

Reconstruction and validation of a long-term surface flux sequence in the semi-arid region of China and North America

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基于中美半干旱區(qū)8個野外試驗站點2003—2008年的觀測數(shù)據(jù),選擇最小二乘法線性擬合、多項式擬合、以及雙重回歸擬合等方法,對NCEP再分析數(shù)據(jù)集的地表通量數(shù)據(jù)進行了系統(tǒng)的檢驗和訂正。結(jié)果表明,對于日平均值,擬合訂正效果相對較差,僅部分站點的土壤含水量以及地表感熱和潛熱通量可以使用曲線擬合的方法得以改進。對月平均值,3種方案都有不同程度的訂正改進效果,訂正的序列還原了數(shù)據(jù)的季節(jié)變化趨勢。在此基礎(chǔ)上,綜合線性回歸和曲線擬合兩種方法的優(yōu)勢,最大程度地還原資料的線性趨勢,并減小因截斷誤差造成的信息損失,構(gòu)建了中美半干旱區(qū)長期的地表通量數(shù)據(jù)序列。所構(gòu)建的半干旱區(qū)長期地表通量序列也為深入認識中美半干旱區(qū)陸氣相互作用的基本特征以及模式結(jié)果驗證,提供了寶貴的基礎(chǔ)數(shù)據(jù)。

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Based on the observation data from 8 field stations in the semi-arid region of China and North America during 2003 to 2008, the land surface flux data in NCEP reanalysis dataset was systematically assessed and corrected with statistical methods like linear regression, curve fitting and dual regression fitting. Results show that the fitting method is not capable enough in terms of daily average value, except for soil wetness and sensible/latent heat fluxes at some individual sites. In contrast, improvements at some degree are identified in terms of monthly mean value in all the three schemes. A long-term land surface flux sequence over semi-arid regions of China and North America is established by combining the advantages of both linear regression and curve fitting methods, which can not only reflect the linear trend of the original reanalysis data but retain the diurnal and seasonal variations to a great extent at the same time. The 30 a land surface flux dataset provides a series of useful information related to the regional climatic change closely. In addition, the reconstructed long term surface dataset is beneficial to better understanding the land-atmosphere interaction and numerical model validation in this region as well.

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李杉,符淙斌.中美半干旱區(qū)長期地表通量序列的構(gòu)建及檢驗.氣象科學(xué),2015,35(1):1-8 LI Shan, FU Congbin. Reconstruction and validation of a long-term surface flux sequence in the semi-arid region of China and North America. Journal of the Meteorological Sciences,2015,35(1):1-8

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收稿日期:2013-05-02
最后修改日期:2013-05-17
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在線發(fā)布日期: 2015-03-13
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