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Srivastava, Shuchita
- Assessment of Vertical Ozone Profiles from INSAT-3D Sounder Over The Central Himalaya
Abstract Views :235 |
PDF Views:85
Authors
Prajjwal Rawat
1,
Manish Naja
1,
Pradeep K. Thapliyal
2,
Shuchita Srivastava
3,
Piyush Bhardwaj
4,
Rajesh Kumar
4,
Samaresh Bhatacharjee
1,
S. Venkatramani
5,
S. N. Tiwari
6,
Shyam Lal
5
Affiliations
1 Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 002, IN
2 Space Applications Centre, Jodhpur Tekra, Ahmedabad 380 015, IN
3 Indian Institute of Remote Sensing, 4 Kalidas Road, Dehradun 248 001, IN
4 National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, US
5 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
6 DDU Gorakhpur University, Gorakhpur 273 009, IN
1 Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 002, IN
2 Space Applications Centre, Jodhpur Tekra, Ahmedabad 380 015, IN
3 Indian Institute of Remote Sensing, 4 Kalidas Road, Dehradun 248 001, IN
4 National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301, US
5 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
6 DDU Gorakhpur University, Gorakhpur 273 009, IN
Source
Current Science, Vol 119, No 7 (2020), Pagination: 1113-1122Abstract
Vertical distribution of ozone has been obtained for the first time using INSAT-3D for the period 2013-2017 over the central Himalaya and validated utilizing balloon-borne observations from a high-altitude site in Nainital (29.4°N, 79.5°E, 1793 m amsl). The INSAT-3D retrieved ozone profiles captured ozone gradient and ozone peak altitude successfully, despite only one IR channel for ozone. This demonstrates the capability of the INSAT-3D Sounder in capturing the observed features, with a smaller bias in the stratosphere and somewhat larger bias in the troposphere. Total ozone column from INSAT-3D showed maximum difference of 8% with ozonesonde-derived total ozone column. Larger ozone bias in the lower troposphere could be attributed to lower reliability of regression coefficient and INSAT-3D channel constraints itself, whereas high variability near the tropopause is possibly due to low ozone, poor temperature retrieval near the tropo-pause and stratosphere–troposphere transport process in the Himalayan region.Keywords
Ozone Profiles, Ozonesonde, Satellite Data, Vertical Distribution.Full Text
References
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- Effect of COVID-19 Lockdown on the Spatio-temporal Distribution of Nitrogen Dioxide Over India
Abstract Views :231 |
PDF Views:87
Authors
Affiliations
1 Marine and Atmospheric Sciences Department, Indian Institute of Remote Sensing, Dehradun 248 001, IN
1 Marine and Atmospheric Sciences Department, Indian Institute of Remote Sensing, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 368-375Abstract
The nationwide lockdown was implemented in India from 25 March 2020 onwards to control the spread of deadly Coronavirus disease 2019 (COVID-19). A sudden shutdown of anthropogenic activities resulted in abrupt decrease of nitrogen dioxide (NO2) across the Indian region. OMI (Ozone Monitoring Instrument) tropospheric column NO2 observations show significantly decreased values during 2020 compared to previous years during 25 March to 19 April. The spatiotemporal variation of tropospheric column NO2 difference between 2020 and average 2017–2019 shows reduction by more than 1 × 1015 molecules/cm2 over the Indo Gangetic Plain, eastern and southern India due to lockdown. However, the western Indian region shows slight enhancement which may be attributed to combined effect of transport of polluted air from Middle East and Pakistan, and relatively higher biomass burning activity during 2020. A significant reduction is also observed on the surface distribution of NOx (NO + NO2) over different Indian cities due to COVID-19 lockdown. Maximum reduction in daily average surface NOx is observed over Kolkata (65.2 ± 18.7 ppbv to 30.3 ± 4.6 ppbv) followed by New Delhi (38.8 ± 17.5 ppbv to 11.5 ± 2.9 ppbv) which may be attributed to vehicle fleet, type of fuel used, power plants and industrial emissions.Keywords
COVID-19 Lockdown, Nitrogen Dioxide, NOx, OMI.Full Text
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