Structure of the Indian southwesterly pre-monsoon and monsoon boundary layers: Observations and numerical simulation

Raman, Sethu; Templeman, B.; Templeman, S; Holt, Teddy; Murthy, Anuradha; Singh, Madan Pal; Agarwaal, P; Nigam, Sudhir; Prabhu, A.; Ameenullah, S.

doi:10.1016/0960-1686(90)90273-p

Cited by 45 publications

(19 citation statements)

References 11 publications

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“…Also, the variability in the depth of the land plume offshore could be a manifestation of the diurnal change in the PBL over land and the travel distance of the daytime and nighttime air masses [see also Ansmann et al, 2001]. Height of the typical daytime PBL over Indian subcontinent during this period is of the order of 2000 m [Raman et al, 1990] and the nocturnal boundary layer about 300 m. Thus there is a distinct difference in the land air mass characteristics that travel over the ocean between day and night. This feature is discussed further with the presentation of numerical modeling analysis and airborne lidar data.…”

Section: Observationsmentioning

confidence: 99%

Dynamics of the elevated land plume over the Arabian Sea and the Northern Indian Ocean during northeasterly monsoons and during the Indian Ocean experiment (INDOEX)

Raman

Niyogi

Simpson

et al. 2002

Geophysical Research Letters

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We describe the dynamics of the formation of an elevated land plume over the Arabian Sea and northern Indian Ocean observed during the 1999 Indian Ocean Experiment (INDOEX). The presence of the elevated plume above the marine boundary layer for a depth of about 2000 m could be inferred from the thermodynamic profiles of the lower troposphere obtained from research vessels in 1997, 1998, and 1999, and in the lidar data obtained from aircraft during the INDOEX. Formation of the elevated plume was investigated further using a three‐dimensional high‐resolution mesoscale modeling system. The plume extends for hundreds of kilometers and its strength and coherence is influenced by the diurnal variation of the upwind continental boundary layer.

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Section: Observationsmentioning

confidence: 99%

Dynamics of the elevated land plume over the Arabian Sea and the Northern Indian Ocean during northeasterly monsoons and during the Indian Ocean experiment (INDOEX)

Raman

Niyogi

Simpson

et al. 2002

Geophysical Research Letters

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“…Earlier studies have generally shown that the depth of the diurnal convective boundary layer (CBL) is of the order of 1000 m, while that of the nocturnal stable boundary layer (SBL) is of the order of 100 m [1]. However, studies on the ABL under special geographical conditions and extreme climatic conditions during the past 10 years have gradually changed the past point of view [2][3][4][5]. For example, Takemi's study [6] on ABL characteristics of the arid region of the Hexi Corridor, Northwest China, inferred that the depth of the CBL is more than 4 km from conventional meteorological sounding data of characteristics of the residual layer.…”

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confidence: 99%

Relationship of atmospheric boundary layer depth with thermodynamic processes at the land surface in arid regions of China

Zhang

Qiao

et al. 2011

Sci. China Earth Sci.

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The atmospheric boundary layer (ABL) is an important physical characteristic of the Earth's atmosphere. Compared with the typical ABL, the ABL in arid regions has distinct features and is formed by particular mechanisms. In this paper, the depth of the diurnal and nocturnal ABLs and their related thermodynamic features of land surface processes, including net radiation, the ground-air temperature difference and sensible heat flux, under typical summer and winter conditions are discussed on the basis of comprehensive observations of the ABL and thermodynamic processes at the land surface carried out in the extreme arid zone of Dunhuang. The relationships of the ABL depth in the development and maintenance stages with these thermodynamic features are also investigated. The results show that the depth of the ABL is closely correlated with the thermodynamic features in both development and maintenance stages and more energy is consumed in the development stage. Further analysis indicates that wind velocity also affects ABL development, especially the development of a stable boundary layer in winter. Taken together, the analysis results indicate that extremely strong thermodynamic processes at the land surface are the main driving factor for the formation of a deep ABL in an arid region. arid region, deep atmospheric boundary layer, development and maintenance, thermodynamic process at the land surface, main driving factor Citation:Zhang Q, Zhang J, Qiao J, et al. Relationship of atmospheric boundary layer depth with thermodynamic processes at the land surface in arid regions

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“…Previous studies and observations have pointed out the ABL heights can be as much as 5 km in lower latitudes such as in India under special climatic conditions (Raman et al 1990;Garratt 1992). Normally, the ABL height is less than 2-3 km in the middle latitudes but varies in different regions.…”

Section: Introductionmentioning

confidence: 96%

Characteristics and Numerical Simulations of Extremely Large Atmospheric Boundary-layer Heights over an Arid Region in North-west China

Wang

et al. 2011

Boundary-Layer Meteorol

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Over arid regions in north-west China, the atmospheric boundary layer can be extremely high during daytime in late spring and summer. For instance, the depth of the observed convective boundary layer can exceed 3,000 m or even be up to 4,000 m at some stations. In order to characterize the atmospheric boundary-layer (ABL) conditions and to understand the mechanisms that produce such an extreme boundary-layer height, an advanced research version of the community weather research and forecasting numerical model (WRF) is employed to simulate observed extreme boundary-layer heights in May 2000. The ability of the WRF model in simulating the atmospheric boundary layer over arid areas is evaluated. Several key parameters that contribute to the extremely deep boundary layer are identified through sensitivity experiments, and it is found that the WRF model is able to capture characteristics of the observed deep atmospheric boundary layer. Results demonstrate the influence of soil moisture and surface albedo on the simulation of the extremely deep boundary layer. In addition, the choice of land-surface model and forecast lead times also plays a role in the accurate numerical simulation of the ABL height.

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Structure of the Indian southwesterly pre-monsoon and monsoon boundary layers: Observations and numerical simulation

Cited by 45 publications

References 11 publications

Dynamics of the elevated land plume over the Arabian Sea and the Northern Indian Ocean during northeasterly monsoons and during the Indian Ocean experiment (INDOEX)

Dynamics of the elevated land plume over the Arabian Sea and the Northern Indian Ocean during northeasterly monsoons and during the Indian Ocean experiment (INDOEX)

Relationship of atmospheric boundary layer depth with thermodynamic processes at the land surface in arid regions of China

Characteristics and Numerical Simulations of Extremely Large Atmospheric Boundary-layer Heights over an Arid Region in North-west China

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