干旱气象
榦旱氣象
간한기상
GANSU METEOROLOGY
2014年
1期
1-9
,共9页
长白山%大气稳定度%湍流强度%无量纲化方差相似性%地表通量
長白山%大氣穩定度%湍流彊度%無量綱化方差相似性%地錶通量
장백산%대기은정도%단류강도%무량강화방차상사성%지표통량
Changbaishan Mountains%atmospheric stability%turbulent intensity%variance similarity%scalar flux
利用长白山森林生态系统定位研究站观测资料，及2003年8月和9月涡旋相关资料，分析和比较了该地区近地层包括风速、风向、大气稳定度在内的平均场特征，以及湍流强度、无量纲化风脉动方差相似性和地表通量变化特征。结果表明：（1）8月和9月稳定度都基本集中在0附近；（2）风速＜2 m·s-1的环境中，湍流发展最为旺盛，随着风速的增大湍流强度先迅速减小，当风速增大到3 m· s-1后，湍流强度偏离0值变大了一些，再继续增大到一定风速大小以后，湍流强度基本不随风速变化；（3）无量纲化三维风脉动方差符合Monin-Obukhov相似理论的“1/3”定律，其最佳通用相似函数在稳定和不稳定条件下都可以拟合得到；（4）地表通量均表现出明显的日变化特征，8月以潜热为主，感热较小；9月仍以潜热为主，但是相比8月明显偏小，感热变化不大。
利用長白山森林生態繫統定位研究站觀測資料，及2003年8月和9月渦鏇相關資料，分析和比較瞭該地區近地層包括風速、風嚮、大氣穩定度在內的平均場特徵，以及湍流彊度、無量綱化風脈動方差相似性和地錶通量變化特徵。結果錶明：（1）8月和9月穩定度都基本集中在0附近；（2）風速＜2 m·s-1的環境中，湍流髮展最為旺盛，隨著風速的增大湍流彊度先迅速減小，噹風速增大到3 m· s-1後，湍流彊度偏離0值變大瞭一些，再繼續增大到一定風速大小以後，湍流彊度基本不隨風速變化；（3）無量綱化三維風脈動方差符閤Monin-Obukhov相似理論的“1/3”定律，其最佳通用相似函數在穩定和不穩定條件下都可以擬閤得到；（4）地錶通量均錶現齣明顯的日變化特徵，8月以潛熱為主，感熱較小；9月仍以潛熱為主，但是相比8月明顯偏小，感熱變化不大。
이용장백산삼림생태계통정위연구참관측자료，급2003년8월화9월와선상관자료，분석화비교료해지구근지층포괄풍속、풍향、대기은정도재내적평균장특정，이급단류강도、무량강화풍맥동방차상사성화지표통량변화특정。결과표명：（1）8월화9월은정도도기본집중재0부근；（2）풍속＜2 m·s-1적배경중，단류발전최위왕성，수착풍속적증대단류강도선신속감소，당풍속증대도3 m· s-1후，단류강도편리0치변대료일사，재계속증대도일정풍속대소이후，단류강도기본불수풍속변화；（3）무량강화삼유풍맥동방차부합Monin-Obukhov상사이론적“1/3”정률，기최가통용상사함수재은정화불은정조건하도가이의합득도；（4）지표통량균표현출명현적일변화특정，8월이잠열위주，감열교소；9월잉이잠열위주，단시상비8월명현편소，감열변화불대。
The measurement and observation for this study were carried out by using a three-dimensional (u,v,w)sonic anemometer (IAP-SA 485 )at the Forest Ecosystem Opened Research Station of Changbaishan Mountains.Some micrometeorological characteris-tics of wind speed,wind direction,atmospheric stability,and turbulent intensity,variance similarity,scalar fluxes in the near-sur-face layer were analyzed and compared on the basis of the observational data acquired by using the eddy correlation method in August and September 2003.The main results are as follows:(1)Atmospheric stability in August and September was basically concentrated in the vicinity of 0.(2)Turbulence was very active when wind speed was less than 2 m·s-1 and decreased rapidly with wind speed in-creasing.When the wind speed reached 3 m·s-1 ,the turbulence intensity deviated from 0 and got larger,and continued to increase untill a certain wind speed,then turbulence intensity didn’t change with wind speed basically.(3)The normalized variance of three-dimensional wind and z/L satisfied the similarity law under both unstable and stable stratification.Their universal functions also could be fitted according to the“law of 1/3 fractional power”.(4)The diurnal variations of surface fluxes were evident,and latent heat flux was leading in August and September.Latent heat flux in September was significantly less than that in August.Sensible heat flux var-ied little in August and September.
