Precipitable water as a predictor of LCL height

Murugavel, P.; Malap, Neelam; Balaji, B.; Mehajan, Rajeev; Prabha, Thara V.

doi:10.1007/s00704-016-1872-0

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…The above analysis is consistent with results discussed in Murugavel et al (2016). They showed that the column precipitable water (PW), the vertical integral of water vapor density in the atmosphere, is a good predictor of LCL temperature and height Atmos.…”

Section: Cpsupporting

confidence: 90%

“…Diurnal variations of CAPE are directly linked to water vapor content near surface, with higher CAPE environments favoring higher precipitation (Balaji et al, 2017). Precipitable water (PW) and lifting condensation level (LCL) derived from various observations are also closely related (Murugavel et al, 2016). Balaji et al (2017) shows that high PW conditions correspond to shallower boundary layer (with boundary layer height close to LCL) and higher LCL combined with deeper boundary layer height typically occur during drier conditions.…”

mentioning

confidence: 99%

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Convective environment in pre-monsoon and monsoon conditions over the Indian subcontinent: the impact of surface forcing

Thomas¹,

Malap²,

Grabowski³

et al. 2018

Preprint

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<p><strong>Abstract.</strong> Thermodynamic soundings for premonsoon and monsoon seasons from the Indian subcontinent are analyzed to document differences between convective environments. Pre-monsoon environment features more variability for both near surface moisture and free-tropospheric temperature and moisture profiles. As a result, level of neutral buoyancy (LNB) and pseudo-adiabatic Convective Available Potential Energy (CAPE) vary more for the pre-monsoon environment. Pre-monsoon soundings also feature higher Lifting Condensation Levels (LCLs). LCL heights are shown to depend on the availability of surface moisture, with low LCLs corresponding to high surface humidity arguably because of the availability of soil moisture. A simple theoretical argument is developed and showed to mimic the observed relationship between LCL and surface moisture. We argue that the key element is the partitioning of surface energy flux into its sensible and latent components, that is, the surface Bowen ratio, and the way Bowen ratio affects surface buoyancy flux. We support our argument with observations of changes in the Bowen ratio and LCL height around the monsoon onset, and with idealized simulations of cloud fields driven by surface heat fluxes with different Bowen ratios.</p>

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Section: Cpsupporting

confidence: 90%

mentioning

confidence: 99%

Convective environment in pre-monsoon and monsoon conditions over the Indian subcontinent: the impact of surface forcing

Thomas¹,

Malap²,

Grabowski³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…The above analysis is consistent with results discussed in Murugavel et al (2016). They showed that the column precipitable water (PW), the vertical integral of water vapour density in the atmosphere, is a good predictor of LCL temperature and height over the Indian subcontinent.…”

Section: Cloud Base Height and Surface-level Moisturesupporting

confidence: 90%

“…Diurnal variations of CAPE are directly linked to water vapour content near the surface, with higher CAPE environments favouring higher precipitation (Balaji et al, 2017). Precipitable water (PW) and lifting condensation level (LCL) derived from various observations are also closely related (Murugavel et al, 2016). Balaji et al (2017) show that high PW conditions correspond to a shallower boundary layer (with a boundary layer height close to the LCL) and a higher LCL combined, with a deeper boundary layer height typically occurring during drier conditions.…”

Section: Introductionmentioning

confidence: 99%

Convective environment in pre-monsoon and monsoon conditions over the Indian subcontinent: the impact of surface forcing

et al. 2018

View full text Add to dashboard Cite

Abstract. Thermodynamic soundings for pre-monsoon and monsoon seasons from the Indian subcontinent are analysed to document differences between convective environments. The pre-monsoon environment features more variability for both near-surface moisture and free-tropospheric temperature and moisture profiles. As a result, the level of neutral buoyancy (LNB) and pseudo-adiabatic convective available potential energy (CAPE) vary more for the pre-monsoon environment. Pre-monsoon soundings also feature higher lifting condensation levels (LCLs). LCL heights are shown to depend on the availability of surface moisture, with low LCLs corresponding to high surface humidity, arguably because of the availability of soil moisture. A simple theoretical argument is developed and showed to mimic the observed relationship between LCLs and surface moisture. We argue that the key element is the partitioning of surface energy flux into its sensible and latent components, that is, the surface Bowen ratio, and the way the Bowen ratio affects surface buoyancy flux. We support our argument with observations of changes in the Bowen ratio and LCL height around the monsoon onset, and with idealized simulations of cloud fields driven by surface heat fluxes with different Bowen ratios.

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“…Buoyant thermals reach greater heights in the dry boundary layer. PW and LCL height relationships have been discussed by Murugavel et al (2016). In this year, from 14th October, a gradual increase in PW (cm), KI (°C) and TTI (°C) values and a simultaneous decrease in delta equivalent potential temperature Dhe (°C), CvT (°C) and LCL (m) values are observed (figure 6).…”

Section: Mwr Observations During 2014 Nem Onsetmentioning

confidence: 83%

Study on the north-east monsoon onset features using a ground-based microwave radiometer over SHAR

Saroja¹,

Rajasekhar²,

Rao³

et al. 2019

J Earth Syst Sci

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Convection has a significant role in maintaining the atmospheric dynamics and thermodynamics; particularly in the tropical regions, it can often lead to the formation of clouds and precipitation, release of latent heat, etc. Microwave radiometers (MWRs) have evolved as a powerful tool for monitoring the genesis and evolution of the convection over a site. Ground-based MWRs are installed at the Satish Dhawan Space Centre SHAR, (SDSC SHAR) Sriharikota (13.72°N; 80.18°E) located over south coastal Andhra Pradesh, the southeast coast of India in 2014. MWR provides high temporal resolution vertical profiles of temperature, vapour density and liquid column measurements. The mean profiles of temperature and vapour density of upper-air ascents of GPS radiosonde and microwave radiometer (MWR) are compared for the same location. After the middle of October, the rainfall pattern over south peninsular India and in particular Tamil Nadu and south coastal Andhra Pradesh is due to the arrival of the northeasterly/easterly winds. The aim of the present study is to use MWR products for the northeast monsoon (NEM) onset study. In addition to the European Centre for Medium-Range Weather Forecasts (ECMWF) and operational WRF models, reanalysis data products were also used for the study. The association between the temporal evaluation of thermodynamic profiles and NEM onset has been tested for 3 years. The present results suggest that during the period of NEM onset, 3-5 days early signatures can be observed by MWR.

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Precipitable water as a predictor of LCL height

Cited by 11 publications

References 21 publications

Convective environment in pre-monsoon and monsoon conditions over the Indian subcontinent: the impact of surface forcing

Convective environment in pre-monsoon and monsoon conditions over the Indian subcontinent: the impact of surface forcing

Convective environment in pre-monsoon and monsoon conditions over the Indian subcontinent: the impact of surface forcing

Study on the north-east monsoon onset features using a ground-based microwave radiometer over SHAR

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