نتایج جستجو برای: surface wind directions

تعداد نتایج: 795135  

حسن زاده , اسماعیل, نجارخدابخش , حسن,

  The wind drift motion of the water which is produced by the stress of the wind exerted upon the surface of the ocean is described by Ekmans theory (1905). Using the mean monthly values for the wind stress and SST, seasonal Ekman transport for the Persian Gulf was computed and contoured. The geostrophic winds have combined with the SST to estimate the effect of cooling due to Ekman transport o...

Journal: :desert 2012
h r azimzadeh m r ekhtesasi

different types of sediment trap have been introduced so far to be used in erosion measuring stations, each with its own advantages and disadvantages in trapping aeolian particles. these traps have different collection and retention efficiency due to aerodynamic conditions. some characteristics such as isokinetic feature of the trap, collection efficiency, time needed to download sediment, capa...

2014
M. J. Owens

Dipolar streamers are coronal structures formed by open solar flux converging from coronal holes of opposite polarity. Thus, the dipolar streamer belt traces the coronal foot point of the heliospheric current sheet, and it is strongly associated with the origin of slow solar wind. Pseudostreamers, on the other hand, separate converging regions of open solar flux from coronal holes of the same p...

Journal: :Remote Sensing 2016
Paula Doubrawa Rebecca J. Barthelmie Hui Wang Sara C. Pryor Matthew J. Churchfield

Scanning LiDARs can be used to obtain three-dimensional wind measurements in and beyond the atmospheric surface layer. In this work, metrics characterizing wind turbine wakes are derived from LiDAR observations and from large-eddy simulation (LES) data, which are used to recreate the LiDAR scanning geometry. The metrics are calculated for two-dimensional planes in the vertical and cross-stream ...

2008
Y. Hu

Global satellite observations of lidar backscatter measurements acquired by the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) mission and collocated sea surface wind speed data from the Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E), are used to investigate the relation between wind driven wave slope variance and sea surface wind spe...

Journal: :international journal of environmental research 2013
h. hartmann j. livingston m.g. stapleton

the climate and weather patterns of buffalo (new york, u.s.a.) are strongly influenced by thecity’s proximity to lake erie. total monthly snowfall in buffalo is forecasted using neural network techniques(multi-layer perceptron = mlp) and a multiple linear regression (lr) model. the period of analysis comprises 28 years from january 1982 to december 2009. input data include: zonal wind speed (u-...

2009
Leejah Ross Christopher Hennon

A theoretical wind profile algorithm is implemented into a hurricane wind analysis tool to improve a 2-dimensional objective wind analysis. Validation of hurricane surface wind speeds from remote sensing technology has been difficult due to a lack of sufficient storm data needed for the National Oceanic and Atmospheric Administration Hurricane Research Division Real Time Hurricane Wind Analysis...

2006
B. L. Cheong T.-Y. Yu R. D. Palmer M. W. Hoffman S. J. Frasier F. J. López-Dekker

In this paper, a study of the Doppler Beam Swinging (DBS) technique for horizontal wind estimation using an imaging radar is presented. The primary goal is to quantify effects of temporal and spatial inhomogeneities in the quality of DBS wind estimates. The DBS technique has been extensively applied to Mesosphere-Stratosphere-Troposphere (MST) radars, including boundary layer radars (BLR), to o...

2003
Geert Jan van Oldenborgh Aad van Ulden

The temperature in De Bilt in the Netherlands has risen by 1K over the 20th century. This rise parallels the rise in global temperature quite closely, albeit with a slightly higher amplitude. A linear relationship between the two, with a regression coefficient close to one, is an obvious first-order approximation. This is supported by the spatial homogeneity of global warming during the twentie...

Journal: :فیزیک زمین و فضا 0
مجید مزرعه فراهانی استادیارگروه فیزیک فضا، مؤسسة ژئوفیزیک، دانشگاه تهران، ایران مرضیه احمدی دانشجوی دکتری هواشناسی، دانشکدة علوم و فنون دریایی، دانشگاه هرمزگان، ایران محمد علی ثقفی کارشناس ارشد/موسسه ژئوفیزیک، دانشگاه تهران

gonu storm was formed in tropical basin of indian ocean early in june 2007. gonu is the strongest tropical cyclone that happened in arabian sea and north indian ocean and moved toward oman sea and persian gulf and bouncing the lands around the area. this tropical cyclone made extensive damages and human and financial causalities to countries of oman, iran, afghanistan, pakistan, and india. in t...

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