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Co-Authors
- James Cotton
- Alexander Fore
- Raj Kumar
- Christophe Payan
- Ernesto Rodríguez
- Anuja Sharma
- Bryan Stiles
- Ad Stoffelen
- Anton Verhoef
- Abhisek Chakraborty
- Shweta Sharma
- M. Seemanth
- Maneesha Gupta
- Prantik Chakraborty
- Jalpa Modi
- Tapan Misra
- Neeraj Agarwal
- Rashmi Sharma
- R. Sundar
- R. Venkatesan
- C. Anoopa Prasad
- K. N. Navaneeth
Journals
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Bhowmick, Suchandra A.
- An Assessment of the Performance of ISRO’s SCATSAT-1 Scatterometer
Abstract Views :296 |
PDF Views:104
Authors
Suchandra A. Bhowmick
1,
James Cotton
2,
Alexander Fore
3,
Raj Kumar
1,
Christophe Payan
4,
Ernesto Rodríguez
3,
Anuja Sharma
1,
Bryan Stiles
3,
Ad Stoffelen
5,
Anton Verhoef
5
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Met Office, GB
3 Jet Propulsion Laboratory, California Institute of Technology, US
4 CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, FR
5 Royal Netherlands Meteorological Institute (KNMI), NL
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Met Office, GB
3 Jet Propulsion Laboratory, California Institute of Technology, US
4 CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, FR
5 Royal Netherlands Meteorological Institute (KNMI), NL
Source
Current Science, Vol 117, No 6 (2019), Pagination: 959-972Abstract
SCATSAT-1 is a continuity mission for the Oceansat-2 scatterometer, OSCAT-1, which provided useful ocean vector wind observations used in, among others, oceanography, numerical weather prediction (NWP) and nowcasting. The purpose of this paper is to review the findings of the SCATSAT-1 CalVal team regarding the stability and performance of version 1.1.3 of the SCATSAT-1 data. The international CalVal team organized by ISRO included participants from various institutions in India, ISRO’s Space Applications Centre, KNMI from the Netherlands, and from the USA, NOAA, and NASA’s JPL. To perform the evaluation, different centres processed the data independently using heritage processors and made comparisons against NASA’s Ku-band QuikSCAT mission, in situ data, and NWP models. We also provide a preliminary assessment of the impact of the SCATSAT-1 data on operational forecasts in India and Europe. We conclude that the SCATSAT-1 data shows significantly improved performance relative to ISRO’s OSCAT-1 on Oceansat-2, and that the instrument seems to be stable, given the limited period of observation. The CalVal team has also identified features in the data that could benefit from calibration and processing changes, potentially leading to further improvements on data quality.Keywords
Calibration, OSCAT-1, QuikSCAT, Weather Prediction.Full Text
References
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- Jaruwatanadilok, S., Stiles, B. W. and Fore, A. G., Crosscalibration between QuikSCAT and Oceansat-2. IEEE Trans. Geosci. Remote Sens., 2014, 52(10), 6197–6204.
- Wang, Z., Stoffelen, A., He, Y., Zhang, B., Verhoef, A., Lin, W., Li, X. and Shao, F., An improved wind direction modulation for Ku-band geophysical model functions, based on ASCAT and OSCAT-2 collocations. J. Geophys. Res. Oceans, manuscript 2018JC014389 (under review).
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- SCATSAT-1 Data Products and Retrieval Team, Algorithm and Theoretical Basis Document for SCATSAT1 Data Products, ISRO/SAC/SCATSAT1/DP/ATBD/V1.0, Dec 2016.
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- Post-Launch Calibration–Validation and Data Quality Evaluation of SCATSAT-1
Abstract Views :259 |
PDF Views:75
Authors
Raj Kumar
1,
Suchandra A. Bhowmick
1,
Abhisek Chakraborty
1,
Anuja Sharma
1,
Shweta Sharma
1,
M. Seemanth
1,
Maneesha Gupta
1,
Prantik Chakraborty
1,
Jalpa Modi
1,
Tapan Misra
1
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
Source
Current Science, Vol 117, No 6 (2019), Pagination: 973-982Abstract
Here we provide a brief description of the post-launch data quality evaluation and calibration–validation chain of the SCATSAT-1, the second scatterometers mission of Indian Space Research Organisation. This chain is of absolute importance to monitor the satellite health and its impact on its measurements. It also provides us overview of the suitability of the data for various applications. The results show that the SCATSAT instrument is having nominal behaviour, the measurements are of very high quality and is comparable to the reference mission QuikSCAT. The ocean surface winds derived using SCATSAT-1 are having errors less than 1 m/s and hence it is suitable for all operational meteorological and oceanographic applications.Keywords
Calibration, Data Quality Evaluation, Scatterometers, Validation, Wind Vectors.Full Text
References
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- Bhowmick, S. A., Kumar, R. and Kiran Kumar, A. S., Crosscalibration of the OceanSAT-2 scatterometer with QuikSCAT scatterometer using natural terrestrial targets. IEEE Trans. Geosci. Remote Sensing, 2014, 52(6), 3393–3398.
- Kumar, R., Chakraborty, A., Parekh, A., Sikhakolli, R., Gohil, B. S. and Kiran Kumar, A. S., Evaluation of Oceansat-2-derived ocean surface winds using observations from global buoys and other scatterometers. IEEE Trans. Geosci. Remote Sensing, 2013, 51(5), 2571–2576.
- Chakraborty, A., Deb, S. K., Sikhakolli, R., Gohil, B. S. and Kumar, R., Intercomparison of OSCAT winds with numericalmodelgenerated winds. IEEE Geosci. Remote Sensing Lett., 2013, 10(2), 260–262.
- Gupta, M., Desai, Y. and Kartikeyan, B., Strategy for quality evaluation of OSCAT data. In Fourth International Conference of Environmental Research, Surat, Gujarat, India, 15–17 December 2011.
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- De Kloe, J., Stoffelen, A. and Verhoef, A., Improved use of scatterometer measurements by using stress-equivalent reference winds. IEEE J. Sel. Top. Appl. Earth, 2017, 10(5), 2340–2347; doi: 10.1109/JSTARS.2017.2685242.
- Cyclone Amphan: Oceanic Conditions Pre- and Post-Cyclone using in situ and Satellite Observations
Abstract Views :170 |
PDF Views:102
Authors
Suchandra A. Bhowmick
1,
Neeraj Agarwal
1,
Rashmi Sharma
1,
R. Sundar
2,
R. Venkatesan
2,
C. Anoopa Prasad
1,
K. N. Navaneeth
1
Affiliations
1 Space Applications Centre, Indian Space Research Organization, Ahmedabad 380 015, IN
2 National Institute of Ocean Technology, MOES, Chennai 600 100, IN
1 Space Applications Centre, Indian Space Research Organization, Ahmedabad 380 015, IN
2 National Institute of Ocean Technology, MOES, Chennai 600 100, IN
Source
Current Science, Vol 119, No 9 (2020), Pagination: 1510-1516Abstract
Amphan, a category-5 tropical cyclone, originated over Bay of Bengal (BoB) and had a landfall in West Bengal, India on 20 May, causing havoc in the region. In this study, in-situ buoy and various satellite measurements are used to analyse the ocean condition before and after the storm, primarily from the air–sea interaction perspective. Widespread anomalous warming was observed in BoB before the event, due to high net surface insolation received by the ocean. The warm SST anomalies in the central BoB were coincident with anti-cyclonic warm core eddies, implying availability of higher oceanic heat content. Observations from BD13 buoy, close to the cyclone track showed heating of the overlying atmosphere due to this ocean warming. Strong surface cooling was observed after passage of the cyclone due to wind induced upper-ocean mixing that is stimulated by low stratification in BoB.Keywords
Air–Sea Interaction, Oceanic Conditions, Satellite and In situ Observations, Tropical Cyclones.Full Text