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Wind shear

About: Wind shear is a research topic. Over the lifetime, 8023 publications have been published within this topic receiving 185373 citations.


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Journal ArticleDOI
TL;DR: The authors used the TOPEX/POSEIDON altimetric sea level observation during 1992-1993 to validate the simulation made by a global ocean general circulation model (OGCM) forced by the daily wind stress and heat flux derived from the National Meteorological Center operational analysis.
Abstract: The TOPEX/POSEIDON altimetric sea level observation during 1992-1993 was used to validate the simulation made by a global ocean general circulation model (OGCM) forced by the daily wind stress and heat flux derived from the National Meteorological Center operational analysis. The OGCM is a version of the modular ocean model with a horizontal resolution of 2 deg longitude and 1 deg latitude and 22 levels in the vertical. The model simulation is compared to the observation at spatial scales of the order of 500 km and larger. Only the temporal variations are examined. The variability is composed primarily of the annual cycle and intraseasonal fluctuations (periods shorter than 100 days). The basic features of the annual cycle are simulated well by the model. Major discrepancies are found in the eastern tropical Pacific, as well as the eastern North Pacific and most of the interior of the North Atlantic. The culprit is suspected to be the inadequate heat forcing and mixing parameterizations of the model. Significant intraseasonal variability is found in the central North Pacific and the Southern Ocean. The simulation is highly correlated with the observation at periods from 20 to 100 days. The spatial scales are larger than 1000 km in many places. These variabilities are apparently the barotropic response of the ocean to wind forcing. The results of the study provide a basis for future assimilation of the data into the OGCM for improved description of the large-scale ocean variabilities.

79 citations

Journal ArticleDOI
01 Oct 2007-Icarus
TL;DR: In this article, a reanalysis of an extended set of images obtained at two wavelengths, 418 nm (violet) and 986 nm (near infrared), that sense different altitude levels in the upper cloud is presented.

79 citations

Journal ArticleDOI
01 Jan 2009
TL;DR: In this article, the authors show that the sea surface temperature change over a long period is a key parameter to control the vertical wind shear over the NIO, an important quantity for cyclone activity.
Abstract: The anomalously strong cyclonic activity in the North Indian Ocean (NIO) during the recent years led to a controversy about the impact of global warming on cyclonic activity in the NIO Tropical Easterly Jet (TEJ) plays an important role in the formation of tropical cyclones (TC) over the NIO during summer monsoon season, but in the recent year it is decreasing. This is because of higher warming on the equatorial side of the TEJ than on the northern side, although on both sides a significant warming trend is seen. This warming seems to be a part of the general warming trend known to be occurring since mid 1970s. The vertical wind shear shows a positive correlation with the number of severe storms suggesting that a decrease in easterly shear is favourable for the formation of severe storms. Here I show that the sea surface temperature change over a long period is a key parameter to control the vertical wind shear over the NIO, an important quantity for cyclone activity. The stronger warming of the tropical North Indian Ocean during recent years drove reduced vertical wind shear Thus if the present decreasing trend of TEJ intensity continues, which is highly probable in view of presently occurring green-house warming, there is a strong likelihood of the formation of tropical cyclones of hurricane intensity even during the summer monsoon. Presently the intense systems are known to form only in the pre and post-monsoon seasons, when the vertical wind shear is small.

79 citations

Journal ArticleDOI
TL;DR: In this paper, results from a computer simulation of wind flows around prismatic bodies using a k-ϵ model of turbulence are compared with full scale and wind tunnel tests done by others.

79 citations

Journal ArticleDOI
TL;DR: In this paper, a simple model for the interactions of large wind farms with the turbulent atmospheric boundary layer, augmented for wake effects, is used to examine several important aspects of power degradation in large-scale wind farms.
Abstract: A simple model for the interactions of large wind farms with the turbulent atmospheric boundary layer, augmented for wake effects, is used to examine several important aspects of power degradation in large wind farms. It is shown that when combined with a model for internal boundary layer growth following the start of a wind farm, the model can explain measured power degradation trends. The model is then used to re-examine the advantages of off-shore wind farms. It is shown that the smaller roughness length over ocean that leads to faster hub-height winds compared with land-based wind farms is largely overshadowed by the wind turbines themselves.

79 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023155
2022347
2021165
2020157
2019187
2018165