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Sodar observations of the Nocturnal Boundary Layer at Kharagpur, India: (Research note)

Murthy, BS and Dharmaraj, T and Vernekar, KG (1996) Sodar observations of the Nocturnal Boundary Layer at Kharagpur, India: (Research note). Boundary-Layer Meteorology, 81 (2). pp. 201-209.

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Sodar has been installed at Kharagpur (22.2° N, 87.3° E) as a part of the MONTBLEX-90 experiment and data were collected during the monsoon period. The variation of the nocturnal boundary layer (NBL) during the monsoon period is discussed. The height corresponding to the low-level wind maximum in the sodar wind profile during night time is identified as the NBL height. Mean monthly winds for July and August, plotted as time-height cross sections, reveal the height of the ground-based stable layer. The average NBL heights in the months of July and August are found to be 324 m and 296 m respectively. It is observed that the NBL height is relatively high in the month of July (active phase of monsoon) compared to that during August (weak phase). The months of July (total rainfall = 901 mm) and August (total rainfall = 134 mm) are associated with cloudy and relatively clear sky conditions. This indicates that clouds (through their effect on longwave cooling to space) play an important role in determining the NBL height during the monsoon.

Item Type: Article
Additional Information: Copyright of this article belongs to Kluwer
Uncontrolled Keywords: boundary layer; height; monsoon; nocturnal boundary layer; rainfall; thermal regime, India, West Bengal, Kharagpur
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 21 Feb 2015 15:17
Last Modified: 21 Feb 2015 15:17

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