Determination of moisture changes prior to the onset of south-west monsoon over Kerala using NOAA/TOVS satellite data

Simon, B.; Joshi, P. C.

doi:10.1007/bf01029613

Cited by 15 publications

(11 citation statements)

References 13 publications

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“…The year 2012 experienced more number of break spells with longer period than the active spells, and duration of active spells were also shorter. Hence, during this period, large variability in specific humidity at altitude levels above 2 km is observed, and no such consistent water vapor building up is taking place, which might be resulting in rainfall deficit year [ Simon and Joshi , ].…”

Section: Resultsmentioning

confidence: 99%

Microwave radiometer observations of interannual water vapor variability and vertical structure over a tropical station

et al. 2015

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The intraseasonal and interannual characteristics and the vertical distribution of atmospheric water vapor from the tropical coastal station Thiruvananthapuram (TVM) located in the southwestern region of the Indian Peninsula are examined from continuous multiyear, multifrequency microwave radiometer profiler (MRP) measurements. The accuracy of MRP for precipitable water vapor (PWV) estimation, particularly during a prolonged monsoon period, has been demonstrated by comparing with the PWV derived from collocated GPS measurements based on regression model between PWV and GPS wet delay component which has been developed for TVM station. Large diurnal and intraseasonal variations of PWV are observed during winter and premonsoon seasons. There is large interannual PWV variability during premonsoon, owing to frequent local convection and summer thunderstorms. During monsoon period, low interannual PWV variability is attributed to the persistent wind from the ocean which brings moisture to this coastal station. However, significant interannual humidity variability is seen at 2 to 6 km altitude, which is linked to the monsoon strength over the station. Prior to monsoon onset over the station, the specific humidity increases up to 5-10 g/kg in the altitude region above 5 km and remains consistently so throughout the active spells.

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Section: Resultsmentioning

confidence: 99%

Microwave radiometer observations of interannual water vapor variability and vertical structure over a tropical station

et al. 2015

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“…This height, where the humidity profile drops below 1/e, was found as mean value for the zenith MWR measurements 1 h around each of the selected scans. A similar scaling height was also found using satellite data (Simon and Joshi, 1994). For all scans, the mean value per scan is subtracted to investigate in number of cases during daytime is due to the formation of convective clouds, since overcast situations would influence the number of cases independent of the time of the day.…”

mentioning

confidence: 56%

Detection of land surface induced atmospheric water vapor patterns

Marke¹,

Löhnert²,

Schemann³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> Finding observational evidence of land surface atmosphere interactions is crucial for understanding the spatial and temporal evolution of the boundary layer, as well as for model evaluation, in particular large-eddy simulation (LES) models. In this study, the influence of a heterogeneous land surface on the spatial distribution of atmospheric water vapor is assessed. Ground-based remote sensing measurements of a scanning microwave radiometer (MWR) are used in a long-term study over six years to characterize spatial heterogeneities in integrated water vapor (IWV) during clear sky conditions at the J&#252;lich Observatory for Cloud Evolution (JOYCE). The resulting deviations from the mean of the scans reveal a direction-dependent IWV that is visible throughout the day. Comparisons to a satellite derived spatial IWV distribution show a good agreement for a selection of 61 satellite overpasses during convective situations. With the help of a land use type classification and information on the topography, the main type for the regions with a positive IWV deviation was determined to be agricultural fields and nearby open pit mines. Negative deviations occurred mainly above elevated forests and urban areas. The observational results are in agreement with a high resolution large-eddy simulation (LES), which was used in addition to investigate changes in surface fluxes and the water vapor and cloud field for an altered land use input.</p>

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“…Detailed characterization of inter tropical convergence zone has been carried out using satellite data. The INSAT and NOAA data have brought out unique nature of monsoon onset with large-scale changes in wind and moisture profiles in lower troposphere prior to monsoon onset 14,15 . The critical role-played by sea surface temperature in Indian Ocean and Pacific Ocean regions were clearly brought out by several studies.…”

Section: Weather and Climatementioning

confidence: 99%

Indian Earth Observation Programme towards societal benefits: a GEOSS perspective

Navalgund

2006

SPIE Proceedings

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Indian Earth Observation (EO) programme, since its inception has been applications driven and national development has been its main motivation. In order to meet the observational requirements of many societal benefit areas, a series of EO systems have been launched in both polar and geo synchronous orbits. Starting from Bhaskara, the first experimental EO satellite in 1979 to Cartosat-1 successfully launched in May 2005, a large number of sensors operating in optical and microwave spectral regions, providing data at resolutions ranging from 1 km to a meter have been built and flown. Data reception and processing facilities have been established not only in the country but also at various international ground stations. Remotely sensed data and its derived information have become an integral component of the National Natural Resources Management System (NNRMS), a unique concept evolved and established in the country. The paper discusses the evolution of IRS satellite systems, application programmes in different societal benefit areas and the road ahead. How it complements and supplements the international efforts in the context of Global Earth Observation System of Systems has also been indicated.

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Determination of moisture changes prior to the onset of south-west monsoon over Kerala using NOAA/TOVS satellite data

Cited by 15 publications

References 13 publications

Microwave radiometer observations of interannual water vapor variability and vertical structure over a tropical station

Microwave radiometer observations of interannual water vapor variability and vertical structure over a tropical station

Detection of land surface induced atmospheric water vapor patterns

Indian Earth Observation Programme towards societal benefits: a GEOSS perspective

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