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Macrophysical and microphysical properties of monsoon clouds over a rain shadow region in India from ground-based radiometric measurements

Harikishan, G and Padmakumari, B and Maheskumar, RS and Pandithurai, G and Min, QL (2014) Macrophysical and microphysical properties of monsoon clouds over a rain shadow region in India from ground-based radiometric measurements. Journal of Geophysical Research: Atmospheres, 119 (8). pp. 4736-4749.

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The important radiative properties of clouds such as cloud optical depth (COD) and droplet effective radii (Re) are retrieved from the simultaneous measurements by ground-based multifilter rotating shadowband radiometer (MFRSR) and microwave radiometric profiler (MWRP), colocated at Mahabubnagar, a rain shadow region in southern Indian peninsula. Min and Harisson's (1996) retrieval algorithm is used for the first time to derive monsoon cloud properties in India. COD and liquid water path (LWP) retrieved from two independent instruments of MFRSR and MWRP showed reasonably good correlation. During monsoon (July to September) and postmonsoon (October) months, the maximum probability of occurrence of COD for overcast sky is 20. The maximum probability of occurrence of LWP is 100 gm-2 for water clouds during monsoon months, while October showed maximum occurrence at a lower value of 50 gm-2, where most of the times the cloud bases are above freezing level indicating mixed phase clouds. Maximum Re varied from 14-16-μm (10-12) to 12-μm (9) during monsoon to postmonsoon transition with very less probability of occurrence indicating the characteristic feature of this region. A case study showed that the mean Re from ground-based and aircraft measurements are 12.0-±-3.7-μm and 8.14-±-1.4-μm, respectively, indicating a fairly good agreement within the experimental constraints. Intercomparison of ground-based and Moderate Resolution Imaging Spectroradiometer (MODIS)-Terra and MODIS-Aqua-derived COD, LWP and Re over the observational site for overcast and warm clouds indicates that on an average, MODIS-retrieved mean COD and LWP are underestimated, while mean Re is overestimated as compared to ground retrievals. Key Points First time ground retrievals of cloud properties in tropical rain shadow region Less probability of occurrence of higher R e Biases between ground and MODIS cloud products are more over tropical region.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Atmospheric thermodynamics; Optical properties; Radiometry; Satellite imagery, Cloud optical depth; Cloud properties; Microphysical property; Moderate resolution imaging spectroradiometer; Multifilter rotating shadowband radiometers; Probability of occurrence; Radiometric measurements; Simultaneous measurement, Radiometers, cloud; freezing; measurement method; MODIS; optical depth; physical property; radiometer, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 05 Dec 2014 10:50
Last Modified: 05 Dec 2014 10:50

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