Use of Surface Observations to Estimate Upper Air Humidity for the Objective Analysis of Relative Humidity over Indian Region

S. K. Sinha; D; R. Talwalkar; S. G. Narkhedkar; P. L. Kulkarni; S. Nair; S. Rajamani

doi:10.1007/BF03342567

Impact Factor: 5.8

Volume 7 Issue 4

Oct. 1990

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1990 > 7(4): 491-501

Use of Surface Observations to Estimate Upper Air Humidity for the Objective Analysis of Relative Humidity over Indian Region

1.
Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India

doi: 10.1007/BF03342567

Abstract
References
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Abstract:
In the present study objective analyses of relative humidity (RH) at surface and at the levels of 850,700 and 500 hPa have been made using Gandins (1963) optimum interpolation scheme. As the horizontal resolution of the radiosonde stations is rather inadequate for upper air humidity analysis, a scheme has been developed, following Rasmussen (1982) to estimate the upper air RH from the surface observations like surface RH, present weather and cloud cover. The relative humidities at the levels 850, 700 and 500 hPa were related to the surface observations through three separate regression relations. The RH values at 850, 700 and 500 hPa levels were estimated from the surface RH, cloud coverage and present weather using the above regression relations and subsequently the objective analyses at 00 GMT for the period from 4 July to 8 July 1979, were made using these estimated data along with the observed radiosonde data. Objective analyses were also made for the same period using only the radiosonde data for comparison to study the impact of those estimated data. Root mean square errors were computed for all the five days by interpolating RH at the observing stations from the objectively analysed field and comparing them with the actually observed RH to examine how best the analyses (with and without estimated data) fitted the observations. Lastly they were compared with satellite cloud pictures. This study shows that the estimated upper air RH values have positive impact on the analysis of upper air RH and could be used over radiosonde date sparse region and even over oceanic regions.
References

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Manuscript History

Manuscript received: 10 October 1990

Manuscript revised: 10 October 1990

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Use of Surface Observations to Estimate Upper Air Humidity for the Objective Analysis of Relative Humidity over Indian Region

1. Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India

Manuscript received: 1990-10-10
Manuscript revised: 1990-10-10

Abstract: In the present study objective analyses of relative humidity (RH) at surface and at the levels of 850,700 and 500 hPa have been made using Gandins (1963) optimum interpolation scheme. As the horizontal resolution of the radiosonde stations is rather inadequate for upper air humidity analysis, a scheme has been developed, following Rasmussen (1982) to estimate the upper air RH from the surface observations like surface RH, present weather and cloud cover. The relative humidities at the levels 850, 700 and 500 hPa were related to the surface observations through three separate regression relations. The RH values at 850, 700 and 500 hPa levels were estimated from the surface RH, cloud coverage and present weather using the above regression relations and subsequently the objective analyses at 00 GMT for the period from 4 July to 8 July 1979, were made using these estimated data along with the observed radiosonde data. Objective analyses were also made for the same period using only the radiosonde data for comparison to study the impact of those estimated data. Root mean square errors were computed for all the five days by interpolating RH at the observing stations from the objectively analysed field and comparing them with the actually observed RH to examine how best the analyses (with and without estimated data) fitted the observations. Lastly they were compared with satellite cloud pictures. This study shows that the estimated upper air RH values have positive impact on the analysis of upper air RH and could be used over radiosonde date sparse region and even over oceanic regions.