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  • 1
    Monograph available for loan
    Monograph available for loan
    Geneva : WMO
    Associated volumes
    Call number: MOP Per 861(1)
    In: Weather modification programme report
    In: WMO TD
    Type of Medium: Monograph available for loan
    Series Statement: Weather modification programme report 1
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 114 (1976), S. 365-377 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The wind and temperature data for three stations, latitudinally separated in the region east of the Indian Ocean, were analysed by spectrum analysis. The study pointed out two types of prominent wave disturbances, one with periodicity of about 5 days and the other of about 8 days. The occurrence of the two types of disturbances is closely associated with the alternating wind regimes of the Quasi-Biennial Oscillation.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Aircraft observations were made on cloud droplet size distribution in 19 cases of seeded warm cumulus clouds in three meteorologically different regions. An examination of the data suggested the following: (i) In all the 5 cases at Bombay (maritime), and in 6 out of the 7 cases at Poona (modified maritime) the values of median volume diameter, maximum cloud droplet size and liquid water content showed increase after seeding as compared to what they were before. The increases noticed in the median volume diameter ranged up to 48% at Bombay and 478% at Poona. The liquid water content and the maximum droplet size respectively increased upward of 56% and 25% at Bombay and 60% and 31% at Poona. (ii) In 4 out of the 7 cloud cases at Rihand (continental), the values of the parameters referred to above showed increase. The median volume diameter increased up to 372%. The liquid water content and the maximum droplet size increased upward of 160% and 66% respectively. (iii) In the cloud cases wherein the values of the parameters decreased after seeding, the decreases noticed ranged up to 94%. (iv) More unstable conditions prevailed on the days when the seeded clouds showed visible rain than on the days when they did not.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 123 (1985), S. 463-467 
    ISSN: 1420-9136
    Keywords: Geostrophic wind ; Geotrophic balance ; Geostrophic balance in low latitudes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Geostrophic balance over the Arabian Sea and Bay of Bengal regions has been studied using the wind data obtained from the AVRO (HS-748) aircraft during the FGGE-MONEX-79. In the Arabian Sea and the Bay of Bengal regions, the observed wind south of 20°N was found to be sub-geostrophic. In the Arabian Sea region the departure at 1500 m was 75–95% and at 3050 m it was 60–65%. In the Bay of Bengal region the departure was 85–95%. In a few cases north of 20°N the observed winds at 3050 m were found to be super-geostrophic in the regions of enhanced monsoon activity, cyclonic circulation reaching up to 6000 m and in the region of monsoon trough.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1420-9136
    Keywords: Atmospheric boundary layer ; Thermodynamic structure of ABL ; Southwest monsoon ; Boundary layer thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The thermodynamical structure of the atmospheric boundary layer over the Deccan plateau region has been studied with aerological data for 1980 and 1981. The temperatures in the sub-cloud layer were lower on active monsoon days than dose on weak monsoon days. An opposite trend was noticed in the layer above the 900 mbar level. The moisture content on active monsoon days was higher than that on weak monsoon days. The profile of relative humidity above the 850 mbar level showed large deviations between the active and weak monsoon conditions. On active monsoon days the values of dry static stability were higher than those on weak monsoon days. An opposite trend was noticed in the case of moist static stability. On active monsoon days the magnitudes of thev components of wind were small compared with those of theu components, and the latter showed a gradual decrease with height.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 106-108 (1973), S. 1018-1026 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The rocketsonde data obtained from the launchings made at Thumba (8°32′15″N, 76°51′48″E) during the winter period 1970–71, as already reported, have indicated that warmings of noticeable magnitude occurred at high levels (upper stratosphere and mesosphere) over this tropical station during the period mentioned. The mean monthly radiosonde temperatures of 50, 100 and 300 mb levels at Thumba (Trivandrum) and Delhi (28°35′N, 77°12′E) during the same period have also pointed out certain anomalies consistent with the warmings referred to above at Thumba. The radiosonde temperatures of the two stations, Thumba (Trivandrum) and Delhi, have now been examined, along with the values of total ozone, for the ten winter periods commencing from 1961–1962. The analysis has pointed out the possibility of high-level warmings also having occurred in the past over the Indian region during the winters of 1963–1964 and 1967–1968, which are also the periods when prominent warmings are definitely known to have occurred at higher latitudes. The behaviour of total ozone has been found to be different in the different years of the warmings. The features noticed have been presented and discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 104 (1973), S. 614-622 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The inter-dependences between local dust, thermal stability of the air and precipitation have been examined from the available data of two selected pairs of years for the station, Delhi, in northwest India. The indications are that the dust enters into the precipitation picture by virtue of its role in radiation balance during the relatively dry period, January to June, and by virtue of its role in cloud microstructure during the wet period, July to September.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 33 (1984), S. 127-142 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Der mögliche Zusammenhang zwischen täglichen Niederschlagswerten in Tamil Nadu und den täglichen Werten der Summe der k-Indizes bei starken, magnetischen Stürmen und bei magnetisch ruhigen Tagen wurde unter Zuhilfenahme der überlagerten Epochen-methode, der Häufigkeitsverteilung und der Spektrum- und Cospektrumanalyse untersucht. Die geomagnetische Aktivität zur Zeit starker Stürme und der Niederschlag weisen eine gemeinsame Periodizität von 15 Tagen auf, welche bis zu 99% signifikant ist. Die Cospektrumanalyse von geomagnetischer Aktivität und Niederschlag weist eine Maximal-korrelation bei einer Periode von 15 Tagen auf, welche bis zu 95% signifikant ist. Der Phasenunterschied zwischen diesen beiden Parametern beträgt 6 Tage, wobei die geomagnetische Aktivität dem Niederschlag voranläuft. Während geomagnetisch ruhigen Perioden konnten keine signifikanten Korrelationsgipfel gefunden werden. Mägliche physkalische Vorgänge zur Erklärung dieser Zusammenhänge werden diskutiert.
    Notes: Summary The possible linkage between the daily rainfall of Tamil Nadu and the daily values of the sum of k-indices during geomagnetic great storms and magnetically quiet days has been investigated making use of superposed epoch method, frequency distribution, power spectral and cross spectral analyses. Geomagnetic activity during great storms and rainfall have a common 15-day periodicity which is significant at the 99 per cent level. Cross spectral analysis between the geomagnetic activity and rainfall shows maximum correlation over a period of 15-days significant at the 95 per cent level. The relative phase lag noticed between them is 6 days with the geomagnetic storm preceding rainfall. No significant peaks are noticed during geomagnetically quiet days. Cross spectral analysis shows no significant correlation. The possible physical mechanisms for the linkage are discussed.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-0662
    Keywords: Total suspended particulates (TSP) ; enrichment factor ; trace elements ; ionic balance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The total suspended particulate (TSP) levels at Delhi (north India) were measured on 116 days between February and October 1980. The observations were stratified according to season and the values of cross-correlation of the TSP and its components were evaluated. High TSP (209 μg m-3) levels were found during the summer period associated with hot and dry weather in the region and low TSP (109 μg m-3) were found during the monsoon period. Most of the TSP mass was associated with natural soil elements, such as Fe, Al, Mn, Ca, and K. Only a fraction of the mass of the TSP was comprised of elements from anthropogenic sources, e.g., Pb, Ni, Cd, Sb, Cu, and Zn. The aerosols at Delhi were potentially basic in nature, unlike those in European countries which are acidic in nature and cause acid rainfall.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 25 (1985), S. 365-376 
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Rain water samples were collected over a period of a decade from 1974 in Pune, a city which is relatively free from industrial pollution. They were also collected at 4 places during 1974 in the region of Bombay which is highly industrialized. The samples were analyzed for major chemical components and pH. The ionic balance was computed. Samples were collected at Delhi during 1965 and 1966 and were analyzed for pH. The values were compared with those reported for 1978. The total suspended particulates (TSP) were measured at Delhi during 1980 and analyzed for water soluble components. The rain water at all the places except near the industrial source was not acidic and was characterized by the presence of excess cations, particularly Ca. The acid rain near the industrial source was associated with excess anions, especially sulphate. The difference between the cations and anions was inversely proportional to the H+ ion concentration. The pH of rain water at Delhi which was in the alkaline range during 1965 and 1966 remained alkaline even after a period of 12 yr when the city developed industrially. The TSP in the region was rich with the basic components, mainly Ca, suggesting that the alkaline property of the soil dust is mainly responsible for neutralizing the acidic effects resulting from the anthropogenic gaseous pollutants.
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