A robust method to determine global distribution of atmospheric boundary layer top from COSMIC GPS RO measurements

Ratnam, M. Venkat; Basha, S. G.

doi:10.1002/asl.277

Cited by 47 publications

(31 citation statements)

References 16 publications

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“…RO observations may be used to develop ABL climatologies, such as the spatial and temporal variations of the ABL (von Engeln et al, 2005;Sokolovskiy et al, 2007Sokolovskiy et al, , 2010Ao et al, 2008;Ratnam and Basha, 2010). The CHAMP climatology agreed well with the ECMWF analyses over this period, especially over the oceans.…”

Section: Profiling the Atmospheric Boundary Layermentioning

confidence: 55%

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

2011

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Abstract. The launch of the proof-of-concept mission GPS/MET (Global Positioning System/Meteorology) in 1995 began a revolution in profiling Earth's atmosphere through radio occultation (RO). GPS/MET; subsequent single-satellite missions CHAMP (CHAllenging Minisatellite Payload), SAC-C (Satellite de Aplicaciones Cientificas-C), GRACE (Gravity Recovery and Climate Experiment), METOP-A, and TerraSAR-X (Beyerle et al., 2010); and the six-satellite constellation, FORMOSAT-3/COSMIC (Formosa Satellite mission #3/Constellation Observing System for Meteorology, Ionosphere, and Climate) have proven the theoretical capabilities of RO to provide accurate and precise profiles of electron density in the ionosphere and refractivity, containing information on temperature and water vapor, in the stratosphere and troposphere. This paper summarizes results from these RO missions and the applications of RO observations to atmospheric research and operational weather analysis and prediction.

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Section: Profiling the Atmospheric Boundary Layermentioning

confidence: 55%

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

2011

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“…All these studies showed that COSMIC specific humidity compares well with radiosonde, reanalysis, and other satellite data sets. In troposphere, the contribution of water vapor is more in refractivity than temperature Ratnam & Basha, 2010). However, the refractivity data from GPSRO satellite is very accurate from the surface to 40 km.…”

Section: Methodology To Identify the Itczmentioning

confidence: 99%

“…In addition, it includes both temperature and water vapor information. Using limited data, Ratnam and Basha (2010) also demonstrated the use of GPSRO refractivity to locate the ITCZ. Note that changes, which occur in lower troposphere, can significantly appear in refractivity, whereas in upper troposphere temperature controls the refractivity due to less amount of water vapor contribution.…”

Section: Methodology To Identify the Itczmentioning

confidence: 99%

Vertical and latitudinal variation of the intertropical convergence zone derived using GPS radio occultation measurements

Basha¹,

Kishore²,

Ratnam

et al. 2015

Remote Sensing of Environment

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Using GPS radio occultation refractivity data collected over the period of 2002-2013, we present a new method for identification of the intertropical convergence zone (ITCZ). The ITCZ is identified by estimating the maximum in the monthly meridional refractivity and specific humidity field by applying a Gaussian fit at each longitude. The interannual variability and climatology of the ITCZ is presented from 12 years of refractivity data. This new method captures all the general features of ITCZ extent and its variability. We also examine the effects of the ITCZ vertically during different seasons. The ITCZ is observed mostly at eastern Pacific in May month, and it is zonally distributed in the September and October months of each year. The zonal variability is large between lower and higher levels, particularly over the Indian monsoon and western Pacific. The latitudinal difference in the vertical extent between 850 hPa and higher levels is larger during the northern hemisphere (NH) summer than NH winter.

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“…A few studies have been done by using Global Positioning System radio occultation (GPS RO) measurements (Ratnam and Basha, 2010;Guo et al, 2011;Ao et al, 2012) or Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) (McGrath-Spangler and Denning, 2013). GPS RO provides a valuable global view of the height-resolved refractivity or moisture structure of ABL.…”

Section: Introductionmentioning

confidence: 99%

Lidar-based remote sensing of atmospheric boundary layer height over land and ocean

2014

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Abstract. Atmospheric boundary layer (ABL) processes are important in climate, weather and air quality. A better understanding of the structure and the behavior of the ABL is required for understanding and modeling of the chemistry and dynamics of the atmosphere on all scales. Based on the systematic variations of the ABL structures over different surfaces, different lidar-based methods were developed and evaluated to determine the boundary layer height and mixing layer height over land and ocean. With Atmospheric Radiation Measurement Program (ARM) Climate Research Facility (ACRF) micropulse lidar (MPL) and radiosonde measurements, diurnal and season cycles of atmospheric boundary layer depth and the ABL vertical structure over ocean and land are analyzed. The new methods are then applied to satellite lidar measurements. The aerosol-derived global marine boundary layer heights are evaluated with marine ABL stratiform cloud top heights and results show a good agreement between them.

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A robust method to determine global distribution of atmospheric boundary layer top from COSMIC GPS RO measurements

Cited by 47 publications

References 16 publications

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

Exploring Earth's atmosphere with radio occultation: contributions to weather, climate and space weather

Vertical and latitudinal variation of the intertropical convergence zone derived using GPS radio occultation measurements

Lidar-based remote sensing of atmospheric boundary layer height over land and ocean

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