Based on global land monthly precipitation dataset prec / l during the period of 1948 - 2001, ncep / ncar reanalyzed monthly mean wind data and global monthly sst grid data edited by british meteorological bureau. the flood / drought and the secular trend variation of precipitation of global, the northern hemisphere ( nh ), the southern hemisphere ( sh ), eurasia, africa, australia, north america, south america and antarctica in december - february ( djf ) are investigated
本文利用1948 - 2001全球陸地
月降水資料( prec l ) ,美國ncep ncar再分析
月平均風場資料和高度場資料以及英國氣象局整編的全球逐
月海溫格點資料。研究了全球、北、南半球及歐亞、非洲、澳洲、北美、南美和南極大陸6個大尺度區域12 - 2
月的降水趨勢變化及旱澇氣候變化。
Using the global land three months monthly data ( prec / l ) created by chen et al ( 2001 ), ncep / ncar reanalyzed monthly mean wind data and global monthly sst grid data edited by british meteorological bureau, this paper investigates some problems of the climate change of global land rainfall for march - may during 1948 - 2001
用chen等( 2001 )最新創建的全球陸地
月降水資料( prec l ) 、美國ncep ncar再分析
月平均風場資料和英國氣象局整編的全球逐
月海溫格點資料,分析了1948 - 2001年全球陸地3 - 5
月降水場的若干問題。
Scientists do not think the mare basalts in the basins are the source of the gravity anomalies ; individual lava flows appear to be quite thin ? from a few meters to a few tens of meters ? and total accumulations are typically 200 meters or less
科學家不認為盆地中的
月海玄武巖是這些重力異常的來源,因為個別的巖漿流似乎相當薄(從數公尺到數十公尺) ,且累積總計通常少於200公尺。
Scientists already know the ages of the mare flows at the apollo sites from analyzing the radioisotopes in the rock samples, so they can estimate the ages of other flows by comparing their crater densities with those of the landing - site flows
科學家分析巖石樣本中的放射性同位素,已經知道阿波羅登陸點的
月海巖流年齡;因此將其他巖流的隕石坑密度與登陸點巖流的隕石坑密度相比,科學家便能估計其他巖流的年代。
This face, known as the near side, has darker regions called mares which in fact are flatter regions
這面的
月球上深色的地區,稱為
月海,實際上是較為平坦的區域。
The photographs showed that it almost completely lacks the dark maria that are so dominant on the near side
這些照片顯示出遠地面幾乎完全沒有在近地面分佈廣泛的黑暗
月海。
The enormous spa basin contains most of the mare lavas on the far side, yet even these deposits are very thin and of limited extent
巨大的spa盆地含有遠地面大部份的
月海巖漿,但即使是這些礦床也非常薄且范圍有限。
The spa basin as a whole is largely unfilled by mare lavas, whereas even the smallest basin on the near side tends to have copious lava fill
整體而言,大部份的spa盆地沒有被
月海巖漿填滿,即使是近地面最小的盆地也被大量的巖漿所填充。
The results show that although the moon has mare lavas of widely varying compositions and ages, the bulk erupted between 3. 8 billion and three billion years ago
結果指出,盡管
月球
月海巖漿有非常不同的組成和年齡,但大部份都在38 ~ 30億年前爆發。
As the rotation of the moon is synchronous with its revolution around the earth, the moon always presents the same face to the earth
由於
月球的自轉與公轉同步,
月球永遠以同一面向著地球。這面的
月球上深色的地區,稱為
月海,實際上是較為平坦的區域。
Some of these surfaces are mare deposits that have been covered by blankets of highland debris ? layers of ejected rock spread by the impacts that created the moon ' s basins
這類表面有些是被多層高地遺屑(
月球受到撞擊而噴出四散的巖石)覆蓋的
月海礦床。
A pilot scheme to hire two commercial launches for harbour patrol duties was introduced in april 2002. the result of the pilot scheme will be evaluated after two years trials to see if further outsourcing of patrol launches is desirable
二零零二年四月,海事處推行試驗計劃,租賃兩艘商營小輪,用來巡邏海港,為期兩年,然後評估試驗計劃的成果,確定是否宜於進一步外判。