The Open Atmospheric Science Journal最新文献

Modeling Current and Future Climate Change in the UAE using Various GCMs in MarksimGCMR 利用MarksimGCMR中的各种GCMs模拟阿联酋当前和未来的气候变化

The Open Atmospheric Science Journal Pub Date : 2019-12-20 DOI: 10.2174/1874282301913010056

L. S. A. Blooshi, S. Alyan, Ngaina Joshua Joshua, T. Ksiksi

引用次数: 2

Empirical Models for Estimating Tropospheric Radio Refractivity Over Osogbo, Nigeria 估算尼日利亚奥索博对流层无线电折射率的经验模式

The Open Atmospheric Science Journal Pub Date : 2019-11-15 DOI: 10.2174/1874282301913010055

D. Akpootu, A. Rabiu

{"title":"Empirical Models for Estimating Tropospheric Radio Refractivity Over Osogbo, Nigeria","authors":"D. Akpootu, A. Rabiu","doi":"10.2174/1874282301913010055","DOIUrl":"https://doi.org/10.2174/1874282301913010055","url":null,"abstract":"Estimation of tropospheric radio refractivity is significant in the planning and design of terrestrial communication links.In this study, the monthly average daily atmospheric pressure, relative humidity and temperature data obtained from the National Aeronautics and Space Administration (NASA) during the period of twenty two years (July 1983 - June 2005) for Osogbo (Latitude 7.470N, Longitude 4.290E, and 302.0 m above sea level) were used to estimate the monthly tropospheric radio refractivity. The monthly average daily global solar radiation with other meteorological parameters was used to developed one, two, three and four variable correlation(s) tropospheric radio refractivity models for the location. The accuracy of the proposed models are validated using statistical indicator of coefficient of determination (R2), Mean Bias Error (MBE), Root Mean Square Error (RMSE), Mean Percentage Error (MPE), Nash - Sutcliffe Equation (NSE) and Index of Agreement (IA).In each case one empirical model was recommended based on their exceptional performances after ranking, except for the two variation correlations with two empirical models. The recommended models were further subjected to ranking from which the three variable correlations model that relates the radio refractivity with the absolute temperature, relative humidity and global solar radiation was found more suitable for estimating tropospheric radio refractivity for Osogbo with R2= 100.0%, MBE = -0.2913 N-units, RMSE = 0.3869 N-units, MPE = 0.0811%, NSE = 99.9999% and IA = 100.00%.The newly developed recommended models (Equations 16c, 17d, 17f, 18d and 19) can be used for estimating daily and monthly values of tropospheric radio refractivity with higher accuracy and has good compliance to highly varying climatic conditions for Osogbo and regions of similar climatic information.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121214567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effects of the Sea Breeze Circulation on Soil Temperature Over Kuwait Using in Situ Observations and the ECMWF Model 利用现场观测和ECMWF模式分析海风环流对科威特土壤温度的影响

The Open Atmospheric Science Journal Pub Date : 2019-11-02 DOI: 10.2174/1874282301913010029

H. Alsarraf, M. V. Broeke, H. AlJassar

引用次数: 1

The Predictability of Blocking Character in the Northern Hemisphere Using an Ensemble Forecast System 利用集合预报系统对北半球阻塞特征的可预测性

The Open Atmospheric Science Journal Pub Date : 2019-09-30 DOI: 10.2174/1874282301913010013

D. Reynolds, A. Lupo, A. Jensen, P. Market

{"title":"The Predictability of Blocking Character in the Northern Hemisphere Using an Ensemble Forecast System","authors":"D. Reynolds, A. Lupo, A. Jensen, P. Market","doi":"10.2174/1874282301913010013","DOIUrl":"https://doi.org/10.2174/1874282301913010013","url":null,"abstract":"\u0000 \u0000 Some weather extremes are the result of atmospheric blocking, which can be responsible for the stagnation of weather patterns. These large-scale quasi-stationary mid-latitude flow regimes can result in significant temperature and precipitation anomalies over the regions that the blocking event impacts or in the upstream and downstream regions.\u0000 \u0000\u0000 \u0000 The ability to predict periods of anomalous weather conditions due to atmospheric blocking is a major problem for medium-range forecasting. Analyzing the National Centers for Environmental Prediction (NCEP) Ensemble 500-hPa pressure level heights (240 hrs.) ten-day forecasts, and using the University of Missouri blocking archive to identify blocking events, the forecasted onset, duration, and intensity of model blocking events are compared to observed blocks.\u0000 \u0000\u0000 \u0000 The observed blocking events were identified using the University of Missouri blocking archive. Comparing these differences using four Northern Hemisphere case studies occurring over a one-year period across the Northern Hemisphere has shown the continued need for improvement in the duration and intensity of blocking events. Additionally, a comparison of the block intensity to a diagnostic known as the Integrated Regional Enstrophy (IRE) was performed in order to determine if there is a correlation between IRE and these quantities.\u0000 \u0000\u0000 \u0000 Having a better understanding of block persistence and their associated anomalies can help society prepare for the damage they can cause.\u0000","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122422590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Capturing Day-to-day Diurnal Variations in Stability in the Convective Atmospheric Boundary Layer Using Large Eddy Simulation 利用大涡模拟捕捉对流大气边界层稳定性的逐日变化

The Open Atmospheric Science Journal Pub Date : 2018-11-30 DOI: 10.2174/1874282301812010107

Jordan Nielson, Kiran Bhaganagar

{"title":"Capturing Day-to-day Diurnal Variations in Stability in the Convective Atmospheric Boundary Layer Using Large Eddy Simulation","authors":"Jordan Nielson, Kiran Bhaganagar","doi":"10.2174/1874282301812010107","DOIUrl":"https://doi.org/10.2174/1874282301812010107","url":null,"abstract":"Large Eddy Simulation (LES) modelers must begin to answer the question of how to better incorporate large datasets into simulations. This question is important because, at a given location, the diurnal, seasonal, and day-to-day variations of atmospheric stability have significant consequences for the power generated by wind turbines. The following study provides a methodology to obtain discrete values of surface flux, inversion height and geostrophic wind for LES using field data over multiple diurnal cycles (averaged over a month) at 12 Local Time (LT) (during the convective ABL). The methodology will allow the discrete LES to quantify the day-to-day variations over multiple diurnal cycles.The study tests the hypothesis that LES can capture the mean velocity and TKE profiles from the averaged variations in surface heat flux at 12 LT measured in the field (mean, +1 standard deviation, and -1 standard deviation). The discrete LES from the mean, +1 standard deviation, and -1 standard deviation surface heat flux represent the variations in the ABL due to the day-to-day variations in surface heat flux. The method calculates the surface heat flux for the NREL NWTC M5 dataset. The field data were used to generate Probability Density Functions (PDFs) of surface heat flux for the January and July 12 LT. The PDFs are used to select the surface heat fluxes as inputs into the discrete LES.A correlation function between the surface heat flux and the boundary layer height was determined to select the initial inversion height, and the geostrophic departure function was used to determine the geostrophic wind for each surface heat flux. The LES profiles matched the averaged velocity profiles from the field data to 4% and the averaged TKE profiles to 6% and, therefore, validated the methodology. The method allows for further quantification of day-to-day stability variations using LES.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122337647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A Synoptic Study of Low Troposphere Wind at the Israeli Coast 以色列海岸对流层低层风的天气学研究

The Open Atmospheric Science Journal Pub Date : 2018-08-13 DOI: 10.2174/1874282301812010080

S. Berkovic, P. Alpert

{"title":"A Synoptic Study of Low Troposphere Wind at the Israeli Coast","authors":"S. Berkovic, P. Alpert","doi":"10.2174/1874282301812010080","DOIUrl":"https://doi.org/10.2174/1874282301812010080","url":null,"abstract":"This research is dedicated to the study of the feasibility of surface wind downscaling from 925 or 850 hPa winds according to synoptic class, season and hour.Two aspects are examined: low tropospheric wind veering and wind speed correlation and verification of the ERA-Interim analysis wind by comparison to radiosonde data at Beit Dagan, a station on the Israeli coast.Relatively small (< 60°) cross angles between the 1000 hPa wind vector and the 925 hPa or 850 hPa wind vector at 12Z and high correlation (0.6-0.8) between the wind speed at the two levels were found only under winter lows. Relatively small cross angles and small wind speed correlation were found under highs to the west and Persian troughs.The verification of ERA-Interim analysis in comparison with radiosonde data has shown good prediction of wind direction at 12Z at 1000, 925 and 850 hPa levels (RMSE 20°-60°) and lower prediction quality at 1000 hPa at 0Z (RMSE 60°-90°). The analysis under-predicts the wind speed, especially at 1000 hPa. The wind speed RMSE is 1-2 m/s, except for winter lows with 2-3 m/s RMSE at 0Z, 12Z at all levels.Inference of surface wind may be possible at 12Z from 925 or 825 hPa winds under winter lows. Inference of wind direction from 925 hPa winds may be possible under highs to the west and Persian troughs. Wind speed should be inferred by interpolation, according to historical data of measurements or high resolution model.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131685460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of WRF Microphysics Schemes and Dynamics During an Extreme Precipitation Event in East Idaho 爱达荷州东部一次极端降水事件中WRF微物理方案和动力学研究

The Open Atmospheric Science Journal Pub Date : 2018-06-29 DOI: 10.2174/1874282301812010058

Thomas A. Andretta

{"title":"Investigation of WRF Microphysics Schemes and Dynamics During an Extreme Precipitation Event in East Idaho","authors":"Thomas A. Andretta","doi":"10.2174/1874282301812010058","DOIUrl":"https://doi.org/10.2174/1874282301812010058","url":null,"abstract":"The 26 December 2003 snowstorm was a rare and long-lived weather system that affected east Idaho. Light snow began falling Christmas night, became steadier and heavier during the next day, and tapered off during the morning on the 27th. Snowfall estimates of 20.3-38.1 cm (8.0-15.0 in) were observed over a 24-hour period on 26 December 2003 in the lower part of the Snake River Plain, paralyzing local communities and transportation centers with snowdrifts and poor visibilities.The Weather Research and Forecasting Unified Environmental Modeling System was used to conduct a sensitivity study of five precipitation microphysics schemes at two grid scales during the event.A comparison of the model accumulated total grid scale precipitation at 12-km and 4-km scales with the observed precipitation at several stations in the lower plain, indicated small negative biases (underprediction) in all of the schemes. The Purdue-Lin and Weather Research and Forecasting Double-Moment 6-Class microphysics schemes contained the smallest root mean squared errors.The Purdue-Lin and Weather Research and Forecasting Double-Moment 6-Class schemes provided several insights into the dynamics of the snowstorm. A topographic convergence zone, seeder-feeder mechanism, and convective instability were major factors contributing to the heavy snowfall in the lower plain.","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115392468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analyzing the Fluctuations of Atmospheric Precipitable Water in Iran During Various Periods Based on the Retrieving Technique of NCEP/NCAR 基于NCEP/NCAR反演技术的伊朗不同时期大气可降水量波动分析

The Open Atmospheric Science Journal Pub Date : 2018-05-31 DOI: 10.2174/1874282301812010048

I. Rousta, Mehdi Doostkamian, H. Ólafsson, Hao Zhang, Sayed Hossein Vahedinejad, Omar Sarif, E. Vargas

{"title":"Analyzing the Fluctuations of Atmospheric Precipitable Water in Iran During Various Periods Based on the Retrieving Technique of NCEP/NCAR","authors":"I. Rousta, Mehdi Doostkamian, H. Ólafsson, Hao Zhang, Sayed Hossein Vahedinejad, Omar Sarif, E. Vargas","doi":"10.2174/1874282301812010048","DOIUrl":"https://doi.org/10.2174/1874282301812010048","url":null,"abstract":"\u0000 \u0000 The current study has compared the fluctuations of atmospheric precipitable water over Iran during three periods of 1948 – 1957, 1958 – 1978, and 1979 – 2012 using upper-air reanalyzed data from NCEP/NCAR.\u0000 \u0000 \u0000 \u0000 The results indicated that, in all the three periods, average distribution and coefficient of spatial variation decreased with altitude. In contrast, there was a positive relationship between coefficient of spatial variation and altitude. The results of trend analysis showed that atmospheric precipitable water of Iran calculated using the upper-air reanalyzed data by NCEP/NCAR experienced various fluctuations during the three periods of 1948 – 1957, 1958 – 1978, and 1979 – 2012. The increase of the precipitable water during the first period was not significant at the level of 95%. The increase of the precipitable water during the second period was significant at the level of 95% just in 25% of the regions. In contrast to the second period, 70% of the country’s area followed a declining trend. However, this decreasing trend was not significant at the level of 95%, either.\u0000 \u0000 \u0000 \u0000 The results of Alexandersson statistical method showed that the biggest shift in the average of precipitable water happened during the third period. Overall, variations in the precipitable water over Iran in the past ~60 years are not within the uncertainty of the reanalysis data and are therefore clearly discernible.\u0000","PeriodicalId":122982,"journal":{"name":"The Open Atmospheric Science Journal","volume":"53 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116841867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Assimilation of GPS Radio Occultation Data for Tropical Cyclogenesis: A Case Study in the Eastern Atlantic 热带气旋形成过程中GPS掩星数据的同化:以东大西洋为例

The Open Atmospheric Science Journal Pub Date : 2018-04-30 DOI: 10.2174/1874282301812010033

K. Rosado, S. Chiao

引用次数: 0

Study of Atmospheric Discharges by Near Surface Electric Field Measurements 用近地表电场测量研究大气放电

The Open Atmospheric Science Journal Pub Date : 2018-04-23 DOI: 10.2174/1874282301812010021

H. Mkrtchyan

引用次数: 3