Opin vísindi

Fletta eftir höfundi "Olafsson, Haraldur"

Fletta eftir höfundi "Olafsson, Haraldur"

Röðun: Raða: Niðurstöður:

  • Icon
    Decadal Spatial-Temporal Variations in the Spatial Pattern of Anomalies of Extreme Precipitation Thresholds (Case Study: Northwest Iran) 
    Rousta, Iman; Nasserzadeh, Mohammad; Jalali, Masoud; Haghighi, Esmaeil; Olafsson, Haraldur; Ashrafi, Saeide; Doostkamian, Mehdi; Ghasemi, Ali (MDPI AG, 2017-08-03)
    This study focused on decadalvariations of extreme precipitation thresholds within a 50-year period (1961–2010) for 250 stations of Iran’s northwest. The 99th percentile was used as the threshold of extreme precipitation. In order to analyze threshold ...
  • Icon
    Gap-Filling of MODIS Time Series Land Surface Temperature (LST) Products Using Singular Spectrum Analysis (SSA) 
    Ghafarian Malamiri, Hamid; Rousta, Iman; Olafsson, Haraldur; Zare, Hadi; Zhang, Hao (MDPI AG, 2018-08-23)
    Land surface temperature (LST) is a basic parameter in energy exchange between the land and the atmosphere, and is frequently used in many sciences such as climatology, hydrology, agriculture, ecology, etc. Time series of satellite LST data have ...
  • Icon
    Harmonic Analysis of the Spatiotemporal Pattern of Thunderstorms in Iran (1961–2010) 
    Sabziparvar, Ali Akbar; Mir Mousavi, Seyed Hossein; Karampour, Mostafa; Doostkamian, Mehdi; Haghighi, Esmaeil; Rousta, Iman; Olafsson, Haraldur; SARIF, MD OMAR; Gupta, Rajan Dev; Moniruzzaman, Md; Hasan, Khairul; Ghasemi, Ali (Hindawi Limited, 2019-02-11)
    The current study aimed at investigating cycles and the spatial autocorrelation pattern of anomalies of thunderstorms in Iran during different periods from 1961 to 2010. In this analysis, 50-year periods (1961–2010) of thunderstorm codes have been ...
  • Icon
    The Icelandic volcanic aeolian environment: Processes and impacts — A review 
    Arnalds, Olafur; Dagsson-Waldhauserova, Pavla; Olafsson, Haraldur (International Society for Aeolian Research, 2016-02-15)
    Iceland has the largest area of volcaniclastic sandy desert on Earth or 22,000 km2. The sand has been mostly produced by glacio-fluvial processes, leaving behind fine-grained unstable sediments which are later re-distributed by repeated aeolian events. ...
  • Icon
    Interactions between the atmosphere, cryosphere, and ecosystems at northern high latitudes 
    Boy, Michael; Thomson, Erik; Acosta Navarro, Juan C.; Arnalds, Olafur; Batchvarova, Ekaterina; Bäck, Jaana; Berninger, Frank; Bilde, Merete; Brasseur, Zoé; Dagsson-Waldhauserova, Pavla; Castarède, Dimitri; Dalirian, Maryam; de Leeuw, Gerrit; Dragosics, Monika; Duplissy, Ella-Maria; Duplissy, Jonathan; Ekman, Annica; Fang, Keyan; Gallet, Jean-Charles; Glasius, Marianne; Gryning, Sven-Erik; Grythe, Henrik; Hansson, Hans-Christen; Hansson, Margareta; Isaksson, Elisabeth; Iversen, Trond; Jonsdottir, Ingibjorg; Kasurinen, Ville; Kirkevåg, Alf; Korhola, Atte A.; Krejci, Radovan; Kristjánsson, Jón Egill; Lappalainen, Hanna K.; Lauri, Anniina; Leppäranta, Matti; Lihavainen, Heikki; Makkonen, Risto; Massling, Andreas; Meinander, Outi; Nilsson, Douglas; Olafsson, Haraldur; Pettersson, Jan B.C.; Prisle, Nønne; Riipinen, Ilona; Roldin, Pontus; Ruppel, Meri; Salter, Matthew; Sand, Maria; Seland, Øyvind; Seppä, Heikki; Skov, Henrik; Soares, Joana; Stohl, Andreas; Ström, Johan; Svensson, Jonas; Swietlicki, Erik; Tabakova, Ksenia; Thorsteinsson, Throstur; Virkkula, Aki; Weyhenmeyer, Gesa; Wu, Yusheng; Zieger, Paul; Kulmala, Markku (Copernicus GmbH, 2019-02-14)
    The Nordic Centre of Excellence CRAICC (Cryosphere–Atmosphere Interactions in a Changing Arctic Climate), funded by NordForsk in the years 2011–2016, is the largest joint Nordic research and innovation initiative to date, aiming to strengthen research ...
  • Icon
    Investigation of Vorticity during Prevalent Winter Precipitation in Iran 
    Rousta, Iman; Javadizadeh, Farshad; Dargahian, Fatemeh; Olafsson, Haraldur; Shiri-Karimvandi, Amin; Vahedinejad, Sayed Hossein; Doostkamian, Mehdi; Monroy Vargas, Edgar Ricardo; Asadolahi, Anayat (Hindawi Limited, 2018-09-30)
    In this study, precipitation data for 483 synoptic stations, and the U&V component of wind and HGT data for 4 atmospheric levels were respectively obtained from IRIMO and NCEP/NCAR databases (1961–2013). The precipitation threshold of 1 mm and a minimum ...
  • Icon
    On the relationship between the 500 hPa height fluctuations and the atmosphere thickness over Iran and the Middle East 
    Rousta, Iman; Doostkamian, Mehdi; Olafsson, Haraldur; Ghafarian Malamiri, Hamid Reza; Zhang, Hao; Taherian, Allah Morad; SARIF, MD OMAR; Gupta, Rajan Dev; Monroy-Vargas, E. R. (Tethys, Journal of Weather and Climate of the Western Mediterranean, 2019)
    This paper focuses on the relationship between the 500 hPa height fluctuations and the associative atmosphere thickness (AT) over Iran and the Middle East between 1961 and 2013. For this purpose, atmospheric Geopotential Height (HGT) data of the 1000 ...
  • Icon
    The Spatial Variation of Dust Particulate Matter Concentrations during Two Icelandic Dust Storms in 2015 
    Olafsson, Haraldur; Arnalds, Olafur; Dagsson-Waldhauserova, Pavla; Magnúsdóttir, Agnes Ösp (MDPI AG, 2016-06-03)
    Particulate matter mass concentrations and size fractions of PM1, PM2.5, PM4, PM10, and PM15 measured in transversal horizontal profile of two dust storms in southwestern Iceland are presented. Images from a camera network were used to estimate the ...
  • Icon
    Spatiotemporal Analysis of Land Use/Land Cover and Its Effects on Surface Urban Heat Island Using Landsat Data: A Case Study of Metropolitan City Tehran (1988–2018) 
    Rousta, Iman; Sarif, Md; Gupta, Rajan; Olafsson, Haraldur; Ranagalage, Manjula; Murayama, Yuji; Zhang, Hao; Mushore, Terence (MDPI AG, 2018-11-27)
    This article summarized the spatiotemporal pattern of land use/land cover (LU/LC) and urban heat island (UHI) dynamics in the Metropolitan city of Tehran between 1988 and 2018. The study showed dynamics of each LU/LC class and their role in influencing ...
  • Icon
    Vertical distribution of aerosols in dust storms during the Arctic winter 
    Dagsson-Waldhauserova, Pavla; renard, jean-baptiste; Olafsson, Haraldur; VIGNELLES, Damien; Berthet, Gwenael; Verdier, Nicolas; Duverger, Vincent (Springer Science and Business Media LLC, 2019-11-06)
    High Latitude Dust (HLD) contributes 5% to the global dust budget, but HLD measurements are sparse. Dust observations from Iceland provide dust aerosol distributions during the Arctic winter for the first time, profiling dust storms as well as clean ...