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  • 551.6  (2)
  • Automatic weather station; AWS; Battery terminal voltage; DATE/TIME; Dew/frost point; Humidity, relative; IMPETUS; Morocco, North Africa; Net radiation; Precipitation; Short-wave downward (GLOBAL) radiation; Short-wave downward (GLOBAL) radiation, maximum; Snow water equivalent; Snow water equivalent, maximum; Snow water equivalent, minimum; Temperature, air; Temperature, air, maximum; Temperature, air, minimum; Temperature, ice/snow; Temperature, soil; Temperature, technical; Time of day; Tizi-n-Tounza; TZT; Wind direction; Wind direction, standard deviation; Wind speed; Wind speed, maximum  (1)
Document type
Keywords
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Language
Years
  • 1
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    Daily mean meteorology at station TZT, 2001-2009 (2016)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Automatic weather station; AWS; Battery terminal voltage; DATE/TIME; Dew/frost point; Humidity, relative; IMPETUS; Morocco, North Africa; Net radiation; Precipitation; Short-wave downward (GLOBAL) radiation; Short-wave downward (GLOBAL) radiation, maximum; Snow water equivalent; Snow water equivalent, maximum; Snow water equivalent, minimum; Temperature, air; Temperature, air, maximum; Temperature, air, minimum; Temperature, ice/snow; Temperature, soil; Temperature, technical; Time of day; Tizi-n-Tounza; TZT; Wind direction; Wind direction, standard deviation; Wind speed; Wind speed, maximum
    Type: Dataset
    Format: text/tab-separated-values, 63802 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    The influence of DACCIWA radiosonde data on the quality of ECMWF analyses and forecasts over southern West Africa (2021)
    Details
    Publication Date: 2021-10-12
    Description: During the DACCIWA (Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa) field campaign ∼900 radiosondes were launched from 12 stations in southern West Africa from 15 June to 31 July 2016. Subsequently, data-denial experiments were conducted using the Integrated Forecasting System of the European Centre for Medium-range Weather Forecasts (ECMWF) to assess the radiosondes' impact on the quality of analyses and forecasts. As observational reference, satellite-based estimates of rainfall and outgoing long-wave radiation (OLR) as well as the radiosonde measurements themselves are used. With regard to the analyses, the additional observations show positive impacts on winds throughout the troposphere and lower stratosphere, while large lower-tropospheric cold and dry biases are hardly reduced. Nonetheless, downstream, that is farther inland from the radiosonde stations, we find a significant increase (decrease) in low-level night-time temperatures (monsoon winds) when incorporating the DACCIWA observations, suggesting a possible linkage via weaker cold air advection from the Gulf of Guinea. The associated lower relative humidity leads to reduced cloud cover in the DACCIWA analysis. Closer to the coast and over Benin and Togo, DACCIWA observations increase low-level specific humidity and precipitable water, possibly due to changes in advection and vertical mixing. During daytime, differences between the two analyses are generally smaller at low levels. With regard to the forecasts, the impact of the additional observations is lost after a day or less. Moderate improvements occur in low-level wind and temperature but also in rainfall over the downstream Sahel, while impacts on OLR are ambiguous. The changes in precipitation appear to also affect high-level cloud cover and the tropical easterly jet. The overall rather small observation impact suggests that model and data assimilation deficits are the main limiting factors for better forecasts in West Africa. The new observations and physical understanding from DACCIWA can hopefully contribute to reducing these issues.
    Keywords: 551.6 ; data-denial experiment ; field campaign ; radiosonde measurements ; West African monsoon
    Language: English
    Type: map
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
  • 3
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    Using seasonal rainfall clusters to explain the interannual variability of the rain belt over the Greater Horn of Africa (2021)
    Details
    Publication Date: 2021-10-12
    Description: The seasonal cycle of rainfall over the Greater Horn of Africa (GHA) is dominated by the latitudinal migration and activity of the tropical rain belt (TRB). The TRB exhibits high interannual variability in the GHA and the reasons for the recent dry period in the Long Rains (March–May) are poorly understood. In addition, few studies have addressed the rainfall fluctuations during the Msimu Rains (Dec.–Mar.) in the southern GHA region. Interannual variations of the seasonal cycle of the TRB between 1981 and 2018 were analysed using two statistical indices. The Rainfall Cluster Index (RCI) describes the seasonal cycle as a succession of six characteristic rainfall patterns, while the Seasonal Location Index (SLI) captures the latitudinal location of the TRB. The SLI and RCI depict the full seasonal cycle of the TRB supporting interpretations of the interannual variations and trends. The Msimu Rains are dominated by two clusters with opposite rainfall characteristics between the Congo Basin and Tanzania. The associated anomalies in moisture flux and divergence indicate variations in the location of the TRB originating from an interplay between low-level air flows from the Atlantic and Indian Oceans and tropical and subtropical teleconnections. The peak period of the Long Rains shows a complex composition of five clusters, which is tightly connected to intraseasonal and interannual variability of latitudinal locations of the TRB. A persistent location of the TRB near the equator, evidenced in a frequent occurrence of a cluster related to an anomalously weak Walker circulation, is associated with wet conditions over East Africa. Dry Long Rains are associated with strong and frequent latitudinal variations of the TRB position with a late onset and intermittent rainfall. These results offer new opportunities to understand recent variability and trends in the GHA region.
    Keywords: 551.6 ; Greater Horn of Africa ; seasonal cycle of rainfall ; ropical rain belt ; interannual variability
    Language: English
    Type: map
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
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