CSIR-National Physical Laboratory

सीएसआईआर-राष्ट्रीय भौतिक प्रयोगशाला

Atmospheric Science & Metrology

The group is involved in measuring various atmospheric trace gases including greenhouse gases and particulate matter to study their chemical and physical properties and identifying their roles in influencing the atmosphere and climate through state of art instruments and models. The group is now working on developing best practices for accurate measurement of atmospheric trace species for adoption by different agencies and institutions in India engaged in atmospheric monitoring. Work in this field, is of great importance as air quality and climate change has direct impact on human health and ecosystem. The improvement in measurement quality will have societal benefits as that will foster better policy formulations for amelioration of air quality and mitigation of climate change. The group is also working on developing low cost indigenous monitoring equipment for air pollution measurement.

The group is mainly involved in characterization of the ionized and non-ionized atmospheric media over Indian Latitudes, Polar Regions and Terrestrial Environment. A wide range of information about ionosphere, atmospheric aerosols, solar radiation and their interactions is obtained in the group by doing atmospheric soundings and spectroscopy of the atmosphere in wide spectral ranges. Our study involves radio propagation for the purpose of betterment of radio communication, navigation, atmospheric coupling processes (lower and upper) and other societal/strategic applications. In line of this the group also provides ionospheric forecasting/nowcasting to users worldwide through our space weather Regional Warning Center (RWC, NPL-India). Along with the upper atmospheric studies we are involved in studying the aerosol-radiation interaction and its effects on climate and precipitation using different instruments and atmospheric models. The group is also involved in the development of different atmospheric probing instruments and filters for human applications.

  • Providing Calibration of Ozone Analyzers using Primary Ozone Reference Standard.
  • Traceable Measurement of Region-specific Physico-chemical Properties of Aerosol and Trace Gases over Various Parts  of India.
  • Base Line Measurements of Air Pollutants and Greenhouse Gases.
  • Development of Greenhouse Gas Emission Inventories for Different Anthropogenic Sources.
  • Modelling and Observation of Spectral Optical Properties of Aerosol in the Atmospheric Column using Offline/Online  Instruments Onboard Airborne Platforms and Lidar Observations.
  • Source Apportionment using Receptor Models.
  • Stratosphere-Troposphere Exchange of Pollutant over Tropical Region.
  • Estimation of Budget of Pollutants from Local (Biomass Burning, Field Agriculture Burning) and Distant Sources Linkage to Mitigation Policy and Climate Change.
  • Study of Urban Flux of Pollutant in Linkage with Mitigation.
  • Study of Plausible Linkages of Aerosol with Human Health.
  • Quantification of Ionospheric variability due to forcing from above (Sun) and from below (meteorological phenomena and seismic activity).
  • It has been established that the greenline dayglow emission can be a potential candidate to be considered as a proxy to the thermospheric dynamics.
  • For the first time, it has been shown that the variations because of meteorological phenomena of sudden stratospheric warming are of the same order as that because of solar variants.
  • Ionospheric precursor to earthquake were established in a study of five major earthquake affecting Indian region for events measuring greater than six on Richter scale (M>6) during 2015 & 2016.
  • Operation and maintenance of Polar Space Physics Laboratory situated at Indian permanent research base “Maitri”, Antarctica (70°46′00″ S, 11°43′56″ E) for real time monitoring of high latitude ionosphere.
  • Investigation of Near Earth Space Environment System and its impact on Antarctic upper atmospheric regions.
  • Atmospheric aerosols and solar radiation interaction including aerosol radiative forcing.
  • Middle atmospheric dynamics and solar radiation flux.
  • Establishment of calibration facility for Automatic Weather Station (AWS) to ensure data traceability.
  • Chemical Characterization of Aerosols (organic aerosol, bio aerosol ) and Precipitation.
NameDesignationE-mail ID
Dr. Chhemendra SharmaChief Scientist (Head Sub. Div. # 03.01)csharma@nplindia.org
Dr. Tuhin MandalSenior Principal Scientisttuhin@nplindia.org
Dr. Sachidanand SinghSenior Principal Scientistssingh@nplindia.org
Dr. (Ms.) Monika J. KulshresthaSenior Principal Scientistmonikak@nplindia.org
Sh. Ashish RanjanSenior Principal Scientistaranjan@nplindia.org
Dr. Arun Kumar UpadhayayaPrincipal Scientistupadhayayaak@nplindia.org
Dr. Rupesh M Das