Article
Meteorology & Atmospheric Sciences
Lianet Hernandez Pardo, Luiz A. T. Machado, Hugh Morrison, Micael A. Cecchini, Meinrat O. Andreae, Christopher Poehlker, Ulrich Poeschl, Daniel Rosenfeld, Eder P. Vendrasco, Christiane Voigt, Manfred Wendisch, Mira L. Poehlker
Summary: Variability of spectral dispersion of droplet size distributions in convective clouds was investigated in this study based on aircraft measurements and numerical simulations. It was found that in cleaner clouds, the relative dispersion of droplet diameter is negatively correlated with the ratio of cloud water content to adiabatic liquid water content, while no strong correlation was observed in polluted clouds. The contrasting behaviors were associated with collision-coalescence and secondary droplet activation in cleaner and polluted clouds, respectively.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Meteorology & Atmospheric Sciences
Alexa. R. Marcovecchio, Baike Xi, Xiaojian Zheng, Peng Wu, Xiquan Dong, Ali Behrangi
Summary: This study compares the macrophysical and microphysical properties of single-layered liquid-dominant MBL clouds over the Southern Ocean and the East North Atlantic. The study finds that clouds over the Southern Ocean have higher cloud-top heights, thicker cloud layers, larger liquid water path, and colder cloud temperatures compared to the East North Atlantic. Additionally, there are differences in the cloud and drizzle microphysical properties between the two regions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Yazmina Rojas, Justin R. Minder, Leah S. Campbell, Adam Massmann, Rene Garreaud
Summary: Satellite data is crucial for regions lacking ground-based precipitation observations, especially in complex terrains like Chile. This study evaluates the performance of satellite-based precipitation estimation in Chile and finds that IMERG underestimates precipitation, particularly in high-elevation areas and during warm rain periods. Understanding how IMERG performance varies with terrain and microphysical regimes may help improve satellite-based precipitation estimation.
ATMOSPHERIC RESEARCH
(2021)
Article
Environmental Sciences
Fan Liu, Feiyue Mao, Daniel Rosenfeld, Zengxin Pan, Lin Zang, Yannian Zhu, Jianhua Yin, Wei Gong
Summary: The effects of fine aerosols and coarse sea spray aerosols on rainfall have opposite directions and are independent of meteorological conditions.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
A. Gettelman, D. J. Gagne, C. -C. Chen, M. W. Christensen, Z. J. Lebo, H. Morrison, G. Gantos
Summary: This study emphasizes the importance of clouds for weather and climate prediction, and discusses the challenges posed by the multiple scales involved in cloud processes. Through the application of different treatments in a General Circulation Model, the authors found improvements in rain onset, light rain frequency, and the model's cloud feedback response. They also explored using neural networks to emulate the behavior of a detailed microphysical model, with successful simulations achieved at a lower computational cost.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Environmental Sciences
Hemanth S. K. Vepuri, Cheyanne A. Rodriguez, Dimitrios G. Georgakopoulos, Dustin Hume, James Webb, Gregory D. Mayer, Naruki Hiranuma
Summary: This study analyzed the unique properties of Ice-nucleating particles (INPs) in 42 precipitation samples from the Texas Panhandle region, finding variations in INPs across different precipitation events and their association with hydrometeor sizes, temperature, and bacteria.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Meteorology & Atmospheric Sciences
E. Vignon, S. P. Alexander, P. J. DeMott, G. Sotiropoulou, F. Gerber, T. C. J. Hill, R. Marchand, A. Nenes, A. Berne
Summary: Climate models often show inaccuracies in radiative biases over the Southern Ocean due to poor representation of mixed-phase clouds. This study demonstrates the importance of adapting ice nucleation parameterization to reproduce supercooled liquid layers in clouds, which significantly impacts cloud radiative effects. Despite improvements, further development of parameterization for top-down convection is needed to capture turbulence-microphysics interactions at cloud top.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Thermodynamics
M. Brewster, X. Li
Summary: This study analyzes the radiative heat transfer from water droplets in air to a remote heat sink, highlighting the importance of vapor-supersaturation assumption and unintended droplet solution effects. The analysis produces simple formulas for condensational growth and cooling time scales, showing how temperature and droplet volume fraction affect the process. The results also identify a dimensionless factor for the increase in radiative cooling time due to condensation, and a conduction-radiation parameter characterizing the competition between radiative cooling and conductive/convective heating.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Meteorology & Atmospheric Sciences
Cuong M. Nguyen, Mengistu Wolde, Alessandro Battaglia, Leonid Nichman, Natalia Bliankinshtein, Samuel Haimov, Kenny Bala, Dirk Schuettemeyer
Summary: This study combines airborne triple-frequency radar observations with airborne microphysical measurements, providing valuable insights into the scattering properties and microphysical characteristics of different types of snow. By analyzing data collected during an Arctic storm, the study reveals close relationships between the scattering properties of different ice habits and cloud microphysical properties.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)
Article
Environmental Sciences
Anna Napoli, Fabien Desbiolles, Antonio Parodi, Claudia Pasquero
Summary: Aerosols play a crucial role in climate through different feedback mechanisms, affecting radiation, clouds, and air column stability. This study focused on the altitude dependence of aerosol-induced cloud-mediated effects in the Great Alpine Region, showing that seasonal cloud cover, temperature, and precipitation are influenced by aerosol concentrations in the air column, with the overall cloud cover increase leading to surface cooling or warming depending on surface albedo. Different cloud types respond differently to aerosol levels, with convective clouds in summer potentially decreasing at high pollution levels due to increased air column stability.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Yuwei Zhang, Jiwen Fan, Zhanqing Li, Daniel Rosenfeld
Summary: This study investigates the impacts of anthropogenic aerosols on convective intensity and precipitation of a thunderstorm using the WRF-Chem model. The results show that the spectral bin microphysics scheme predicts convective clouds more accurately than the Morrison bulk scheme, and anthropogenic aerosols enhance convective intensity and precipitation mainly through increased condensation latent heating.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Meteorology & Atmospheric Sciences
Kaustav Chakravarty, N. Arun, Praful Yadav, Rupali Bhangale, P. Murugavel, Vijay P. Kanawade, J. Mohmmad, K. S. Hosalikar, G. Pandithurai
Summary: This study examined the characteristics of precipitation microphysics during different stages of tropical cyclone Nisarga in the Western Ghats of India, finding that convective rain had a significant impact and precipitation intensity increased when the cyclone was over the Western Ghats.
ATMOSPHERIC RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Cynthia H. Twohy, Darin W. Toohey, Ezra J. T. Levin, Paul J. DeMott, Bryan Rainwater, Lauren A. Garofalo, Matson A. Pothier, Delphine K. Farmer, Sonia M. Kreidenweis, Rudra P. Pokhrel, Shane M. Murphy, J. Michael Reeves, Kathryn A. Moore, Emily Fischer
Summary: The study measured small cumulus clouds over the western United States during the 2018 wildfire season, finding increased cloud droplet concentrations in regions impacted by biomass burning smoke, with over half of smoke aerosol particles >80 nm diameter forming cloud droplets. These findings suggest complex and competing climatic impacts from widespread reductions in cloud droplet size due to wildfires prevalent across the region during summer months.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Kaustav Chakravarty, S. Gayathridevi, Jaan Mohmmad, K. S. Hosalikar, G. Pandithurai, Dev Niyogi
Summary: The study observed heavy rainfall spells in Mumbai during both the pre-monsoon and monsoon periods with convective systems originating from different parts of the region. Distinct diurnal variations in rainfall occurrences were identified with intense meso-convective environments contributing to multiple peaks during the pre-monsoon period. Additionally, the microphysical characteristics of rainfall differed between the pre-monsoon months and monsoon period, with the urban convective environment playing a key role in precipitation behavior.
Article
Geochemistry & Geophysics
P. P. Leena, Mercy Varghese, V. Anil Kumar, Anas Ibnu Basheer, G. Pandithurai
Summary: The study revealed significant variations in cloud droplet size distribution (CDSD) and microphysical properties prior to monsoon rain events, with both single and multi-mode patterns observed. Large cloud droplets were found in both single and multi-mode clouds, indicating the possible entrainment of aerosols leading to multi modes in the CDSD. The analysis also suggested higher warm rain depths (D*) during multi-mode cases based on observed rain event duration.
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
(2021)
Article
Meteorology & Atmospheric Sciences
M. A. Aswini, Ashwini Kumar, Subrata Kumar Das
ATMOSPHERIC RESEARCH
(2020)
Article
Astronomy & Astrophysics
Subrata Kumar Das, U. V. Murali Krishna, Yogesh K. Kolte, Sachin M. Deshpande, G. Pandithurai
EARTH AND SPACE SCIENCE
(2020)
Article
Geosciences, Multidisciplinary
Subodh Kumar Saha, Mahen Konwar, Samir Pokhrel, Anupam Hazra, Hemantkumar S. Chaudhari, Archana Rai
Summary: Skillful prediction of the Indian Summer Monsoon Rainfall has been a challenge for over 100 years, primarily due to the chaotic nature of subseasonal variability. This study reveals that subseasonal variabilities significantly contribute to the seasonal ISMR, with their impact varying on interannual to multidecadal timescales. Improving the simulation of subseasonal variability, especially synoptic variability, is key to enhancing the forecast skill of the ISMR.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Greeshma M. Mohan, K. Gayatri Vani, Anupam Hazra, Chandrima Mallick, Hemantkumar S. Chaudhari, Samir Pokhrel, S. D. Pawar, Mahen Konwar, Subodh K. Saha, Subrata K. Das, Sachin Deshpande, Sachin Ghude, M. C. Barth, S. A. Rao, R. S. Nanjundiah, M. Rajeevan
Summary: The study evaluated the accuracy of simulating lightning flash counts based on different lightning parameterization schemes and Lightning Potential Index (LPI) in the WRF model, with validation using LDN observation data. Results indicated the robustness of DLP2 and promising prospects for lightning prediction in operational forecasting.
ATMOSPHERIC RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Bhupendra A. Raut, Mahen Konwar, P. Murugavel, Dhananjay Kadge, Dinesh Gurnule, Imran Sayyed, Kiran Todekar, Neelam Malap, Shivdas Bankar, Thara Prabhakaran
Summary: During the Indian summer monsoon, surface raindrop size distributions over a rain shadow region were clustered using the k-means algorithm. Different rainfall patterns showed distinct vertical features, with large drops having different distributions at various heights depending on the rainfall mode.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Mahen Konwar, Thara Prabhakaran, Alexander Khain, Mark Pinsky
Summary: This study investigates the microphysical parameters and shapes of droplet size distributions along three aircraft traverses of developing convective clouds during CAIPEEX Phase III 2015. The results show significant gradients in droplet number concentration and liquid water content within different zones, with diverse DSDs near cloud edges and larger droplets in high updraft regions. Turbulent fluctuations, effective radii changes, and correlation radii of LWC and N-c are also observed in this study.
JOURNAL OF THE ATMOSPHERIC SCIENCES
(2021)
Article
Environmental Sciences
Mercy Varghese, Jerry Jose, A. S. Anu, Mahen Konwar, P. Murugavel, Nandakumar Kalarikkal, Medha Deshpande, V. Thara Prabha
Summary: This case study provides unique airborne observations of aerosol size spectral and chemical characteristics over the peninsular Indian region. The study reveals that the most prominent aerosol type found at all altitudes in the region is organic carbon, followed by refractory black carbon, dust, and sea salt. The cloud forming ability of in-situ aerosols is affected by the absence of sea salt aerosols above cloud base, and the aerosol composition and hygroscopicity are influenced by changes in large-scale winds with altitude.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Abhishek Kumar Jha, Subrata Kumar Das, Sachin M. Deshpande, U. V. Murali Krishna
Summary: This study explores the relationships between storm-scale convection and the large-scale environment in the monsoon trough region, finding that storm-scale convection is selective and predominantly composed of storm cells in a moist mid-level environment with strong vertical ascent. The highest rain intensity is associated with a few linear and nonlinear multicellular storms during dry and weak dynamic forcing conditions, indicating variability in storm-scale convection with large-scale dynamics.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Bhowmik Utsav, Sachin M. Deshpande, Subrata K. Das, Sunil D. Pawar, G. Pandithurai
Summary: The relationship between convective storm properties and lightning over the Western Ghats during a monsoon season was investigated using X-band radar observations and lightning location network observations. The study found that convective storms and lightning occur frequently during the monsoon onset and withdrawal months. Storms with lightning tend to be located on the leeward side and have deeper top-heights, larger areas, and an enhanced hail probability. Negative Cloud to Ground (-CG) flashes are more common than positive Cloud to Ground (+CG) lightning, and storms with +CG features have higher vertical airmass flux in the mid-troposphere.
EARTH AND SPACE SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Abhishek Kumar Jha, Subrata Kumar Das, Sachin M. Deshpande, U. V. Murali Krishna
Summary: The Indian summer monsoon trough (MT) is a region extending from north-western India towards the Bay of Bengal, and the eastern rim of the MT is influenced by the monsoon low-pressure systems in the Bay of Bengal. This study focuses on the convective storms in the eastern rim and their relationship with the formation and propagation of the low-pressure systems. By analyzing radar observations, different categories of convective storms have been identified and it is found that the largest storms contribute the most precipitation.
Article
Meteorology & Atmospheric Sciences
U. V. Murali Krishna, Subrata Kumar Das, Yogesh Kolte, Abhishek Jha, Mahen Konwar, Sachin Deshpande, Govindan Pandithurai
Summary: This study evaluates the performance of four impact-type disdrometers and studies the seasonal variation of rain microphysical properties at the Indian Institute of Tropical Meteorology. The results show comparable raindrop size distribution patterns among the four disdrometers, with higher concentrations of smaller drops during the monsoon season. Principal component analysis reveals three distinct modes of raindrop size distribution characteristics. Different microphysical and dynamical mechanisms lead to seasonal differences in raindrop size distribution characteristics.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2023)
Article
Environmental Sciences
Uriya Veerendra Murali Krishna, Subrata Kumar Das, Ezhilarasi Govindaraj Sulochana, Bhowmik Utsav, Sachin Madhukar Deshpande, Govindan Pandithurai
Summary: The study analyzed the raindrop size distribution during wet and dry spells of the Indian summer monsoon in the Western Ghats region from 2012 to 2015, using Joss-Waldvogel disdrometer measurements. It found significant differences in DSD between wet and dry spells, influenced by dynamic parameters such as moisture, temperature, and vertical wind.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Subrata Kumar Das, Pranjal Prasad Joshi, Rohit Satish Kokitkar, Uriya Veerendra Murali Krishna, Harsha Avinash Tanti, Anuradha Chetan Phadake
Summary: The method uses digital image processing to identify cloud boundaries and derive cloud cross-section area and cloud top height from radar imagery, suitable for high altitude regions. Results show three peaks in cloud height distribution, with diurnal variation in cloud occurrence and semidiurnal variation in cloud cross-section area.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
Article
Geochemistry & Geophysics
Subrata Kumar Das, Anupam Hazra, Sachin M. Deshpande, U. V. Murali Krishna, Yogesh K. Kolte
Summary: This study investigated a deep convective storm over southwest India on October 12, 2011, using ground-based X-band radar measurements and WRF model simulations. Different cloud microphysics schemes were utilized to simulate the storm, with the WRF Double-Moment 6-Class scheme showing better results in capturing the vertical structure of the storm. The study emphasizes the importance of microphysics in different parameterization schemes of WRF simulation for forecasting convective storms in southwest India.
PURE AND APPLIED GEOPHYSICS
(2021)
Article
Meteorology & Atmospheric Sciences
Jayalakshmi Janapati, Balaji Kumar Seela, Pay-Liam Lin, Pao K. Wang, Chie-Huei Tseng, K. Krishna Reddy, Hiroyuki Hashiguchi, Lei Feng, Subrata Kumar Das
JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN
(2020)