Spatial variability of aridity oyer northern India     

Nityanand Singh  G B Pant  S S Mulye 《Journal of Earth System Science》1992,101(3):201-213

Spatial variability of aridity over northern India (north of 20°N) is studied by examining variations in the arid area. Area with an objectively determined summer monsoon rainfall (June to September total) of less than 500 mm is identified as arid area. The summer monsoon rainfall of 212 rain-gauges from 212 districts of the region for the period 1871–1984 are used in the analysis. An interesting feature of the arid area series is that it shows decreasing trend from beginning of the present century. The summer monsoon rainfall fluctuations over five subjectively divided zones over northern India are examined to understand the association between rainfall and the arid area variations. The rainfall series for northwest India shows a significant increasing trend and that for northeast India a significant decreasing trend from the beginning of this century. Rainfall fluctuations over the remaining zones can be considered intermediate stages of a systematic spatial change in the rainfall pattern. This suggested that the recent decreasing trend in the arid area is due to a westward shift in the monsoon rainfall activities. From correlation analyses it is inferred that perhaps the recent decreasing trend in the arid area and increasing trend in the monsoon rainfall over northwest India are associated with a warming trend of the northern hemisphere.  相似文献   

Some problems related to satellite gradiometry     

F. Sacerdote  F. sansò 《Journal of Geodesy》1989,63(4):405-415

Observation equations for a gradiometer in inertial flight are described, and the effects of orbit and attitude errors are modelled, showing that, when high precision direction observations are missing, the use of rotation invariant equations is advantageous. The invariant form of the equations is analysed by demonstrating the necessity of using as observables the eigenvalues of the gravitational tensor instead of classic invariants. The singularity of the problem in spherical approximation is shown, and consequently the necessity of taking into accountJ ₂ in the reference field used in the linearization.  相似文献   

Some aspects of an association between the southern oscillation and indian summer monsoon     

Dr. G. B. Pant  Shri B. Parthasarathy 《Theoretical and Applied Climatology》1981,29(3):245-252

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The Neogene/Quaternary boundary in India: A review     

D P Agrawal  D K Bhatt  Sheela Kusumgar  R K Pant 《Journal of Earth System Science》1981,90(2):111-123

The Neogene/Quaternary boundary has been variously defined in different continents. A global review of the problem shows that only the Olduvai event on the palaeomagnetic timescale may provide an universally acceptable isochronous datum for delineating this boundary. The N/Q boundary in the Siwaliks, Kashmir and the Andamans in India is defined in the light of recent research.  相似文献   

1st Hotine-Marussi Symposium     

Fernando Sansò 《Journal of Geodesy》1987,61(1):83-84

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Considérations relevées de l’étude séismique du dernier paroxysme vésuvien     

G. Imbò 《Bulletin of Volcanology》1955,16(1):161-169

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Oscillations de la colonne magnatique révélées grâce aux observations au statoscope     

G. Imbò 《Bulletin of Volcanology》1955,16(1):177-179

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Airborne measurements of submicron aerosols across the coastline at Bhubaneswar during ICARB     

P. Murugavel  V. Gopalakrishnan  Vimlesh Pant  A. K. Kamra 《Journal of Earth System Science》2008,117(1):273-280

Airborne measurements of the number concentration and size distribution of aerosols from 13 to 700 nm diameter have been made at four vertical levels across a coastline at Bhubaneswar (20°25′N, 85°83′E) during the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB) programme conducted in March–April 2006. The measurements made during the constant-level flights at 0.5, 1, 2 and 3 km altitude levels extend ～100 km over land and ～150km over ocean. Aerosol number concentrations vary from 2200 to 4500 cm^?3 at 0.5 km level but are almost constant at ～ 6000 cm^?3 and ～ 800 cm^?3 at 2 and 3 km levels, respectively. At 1km level, aerosol number concentration shows a peak of 18,070 cm^?3 around the coastline. Most of the aerosol size distribution curves at 0.5 km and 1 km levels are monomodal with a maxima at 110nm diameter which shifts to 70 nm diameter at 2 and 3 km levels. However, at the peak at 1 km level, number concentration has a bimodal distribution with an additional maximum appearing in nucleation mode. It is proposed that this maxima in nucleation mode at 1 km level may be due to the formation and transport of new particles from coastal regions.  相似文献   

Soil-erosion assessment at basin scale through 137Cs content analysis based on pedo-morphological units     

S. Grauso  F. Onori  M. Esposito  M. Neri  G. Armiento  P. Bartolomei  C. Crovato  F. Felici  M. Marcinnò  P. Regina  C. Tebano 《Environmental Geology》2008,54(2):235-247

Soil loss evaluation by means of radioisotopic content measurements represents a promising technique, half-way between field surveys and theoretical models, which still suffers from its practical limits when applied at basin scale. A main limit is represented by the costs of field investigations and laboratory investigations on the high number of soil samples required by a traditional sampling scheme, such as regular grid or transects. A non-conventional soil sampling scheme was tested with the aim to consider a relative scanty number of soil samples and to verify the feasibility of this technique on large areas. This scheme was based on the hypothesis that land analysis and classification could point out areas characterised by homogeneous behaviour with respect to the ¹³⁷Cs deposition and transmission model. A Geographic Information System (GIS)-aided procedure allowed to classify the selected basin area in pedo-morphological units, representative of the different pedologic, morphologic and land-use conditions, to locate few sampling points for each unit. Outcomes pointed out a low correlation between ¹³⁷Cs contents and soil physical and compositional characteristics. Nevertheless, the isotopic methodology allowed to estimate a total soil loss value at basin scale almost consistent with both observed data, given by reservoir sedimentation measurements and estimates from the application of the RUSLE model. Thus, the results can be considered encouraging and they allow to deem that the isotopic methodology can be refined in order to account for erosion and deposition processes even at river basin scale and with a limited number of soil samples.  相似文献   

Environmental geoinformaicts of fast growing Himalaya’s foothill towns and surrounding: concept and implementation     

Pradeep K. Rawat  Charu C. Pant  Hari Krishna Nibanupud 《Earth Science Informatics》2016,9(1):1-19

Himalaya foothill zone have fragile geo-environment due to active tectonics and dynamic hydrological process and its associated reshaped geomorphology. Rapid urbanization and development of new colonies leads to high rate of land use change and natural resource degradation since last three decades which has been accumulating the fragility of the area. Consequently entire Himalaya foothill zone requires a comprehensive local level geo-environmental appraisal for effective sustainable development planning of the region. Keep in view this; the Ramnagar Himalayan Foothill area (RHFA) in district Nainital, Uttarakhand (India) has been selected for the case illustration. The main objective of the study was to develop a GIS database on Ramnagar environmental geo-informatics (REGI) to facilitate all the concern line departments to implement their socioeconomic developmental activities in the most suitable and safe places throughout the study area. REGI suggests, although landscape of the study area have few favorable conditions for the inhabitant (i.e. maximum proportion (92 %) of the study area enjoys sub-tropical to sub-temperate climatic conditions, easy approachable, thick vegetation cover, rich water resources) but the active tectonics and dynamic hydrological process and its associated reshaped geomorphology poses a stressed geo-environment which need to be consider to formulate a decision support system (DSS) for sustainable development planning.  相似文献