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Anoop, S.
- Understanding Relationship between Melt/Freeze Conditions Derived from Spaceborne Scatterometer and Field Observations at Larsemann Hills, East Antarctica during Austral Summer 2015-16
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Authors
Affiliations
1 National Remote Sensing Centre (ISRO), Hyderabad 500 037, IN
2 Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, IN
1 National Remote Sensing Centre (ISRO), Hyderabad 500 037, IN
2 Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, IN
Source
Current Science, Vol 113, No 04 (2017), Pagination: 733-742Abstract
Snow fork and ground penetrating radar at 200 MHz were used for snow depth, wetness and density measurements towards understanding the relationship between melt/freeze conditions derived from spaceborne Advance Scatterometer (ASCAT) and Oceansat-2 Scatterometer (OSCAT), and field observations. The observations were acquired at Larsemann Hills, East Antarctica in austral summer of 2015-16 during the 35th Indian Scientific Expedition to Antarctica. The field observations of wetness correlated well with identified dry and percolation zones showcasing different behaviours of density and wetness. Ice firn was observed at 50-55 cm depth, even in dry zone. Melt onset and number of melt days based on ASCAT varied spatially and temporally over the years and correlated well with positive degree day (PDD) for automatic weather station data located at the Indian Antarctic station, Bharati. Backscatter measurements by OSCAT showed that winter backscatter reduced with accumulation for both dry and percolation zones, but increased in the later part of winter in the percolation zone. A positive but low correlation was observed between ASCAT backscatter to accumulation and the surface mass balance from regional atmospheric climate model (RACMO2.3). A high correlation of 0.78 was observed between reduction in backscatter due to liquid water content and PDD, which coincides with field observations of wetness. The observations serve as baseline to monitor melt conditions and stability of existing ice sheet.Keywords
Ground Penetrating Radar, Ice Firn, Snow-Fork, Scatterometer, Snowpack Characteristics.Full Text
References
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- Response of Fast Ice to Ground Penetrating Radar and Backscattering Coefficient from Scatterometer In Larsemann Hills, East Antarctica
Abstract Views :225 |
PDF Views:86
Authors
Affiliations
1 National Remote Sensing Centre, Hyderabad - 500 037, IN
1 National Remote Sensing Centre, Hyderabad - 500 037, IN
Source
Current Science, Vol 115, No 3 (2018), Pagination: 552-559Abstract
The study presents inter-annual variations in the backscatter response of fast ice (sea ice attached to the coast) to C band Advanced Scatterometer (ASCAT) (2012–2016). It also analyses the Ground Penetrating Radar (GPR) observations collected during the 35th Indian Scientific Expedition to Antarctica (ISEA, 2015–16) for identification of different fast ice features and to measure fast ice depth in the Larsemann Hills area, East Antarctica. Apart from clear demarcation of features like melt water channels, frozen icebergs within fast ice and underlying topography near island, GPR provided fast ice depth information, which was used to understand backscatter response. The seasonal variations of C band backscatter were caused due to changes in snow thickness, time of freezing and sporadic melt/freeze events apart from summer melt. The backscatter response to NOAA high resolution blended daily sea surface temperature (SST) variations indicate that sudden rise/fall in backscatter during winter is probably due to sporadic melt/freeze events caused by rise/fall in SST. The results show volumetric contribution from sheet ice and domination of snow metamorphism towards increase in backscatter over fast ice. This study highlights the importance of monitoring backscatter response of fast ice to determine its state and condition. Depending on the characteristics of backscatter inter-annual curve, information about time of freeze up, melt season, ice build-up, and sporadic freeze/ thaw events can be inferred which play an important role in the energy budget of Antarctica.Keywords
Antarctica, ASCAT, Fast Ice, GPR, Larsemann Hills.Full Text
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