Abstract:
Surface melt onset, duration and end date for the Antarctic Peninsula from 1999/2000 to 2016/2017 at a spatial resolution of 2 km, derived from scatterometer data. Years 1999/2000 to 2008/09 are based on QSCAT data and 2009/10 to 2016/17 on ASCAT data.
This work was funded by NERC grant NE/L006065/1.
Keywords:
ASCAT, Antarctic Peninsula, QSCAT, Surface melt
Bevan, S., & Luckman, A. (2018). Annual melt onset, duration and end dates for the Antarctic Peninsula derived from Quikscat and ASCAT scatterometer Enhanced Resolution data, 1999-2017 (Version 1.0) [Data set]. Polar Data Centre, Natural Environment Research Council, UK. https://doi.org/10.5285/e3616d28-759e-4cca-8fae-fe398f9552ba
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2017-10-11 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Prof Adrian Luckman |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Dr Suzanne Bevan |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Parent Dataset: | N/A |
| Reference: | Suzanne Bevan, Adrian Luckman, Peter Kuipers Munneke, Bryn Hubbard, Bernd Kulessa, David Ashmore (2018) Decline in Surface Melt Duration on Larsen C Ice Shelf Revealed by ASCAT Scatterometer. Earth and Space Science, DOI: 10.1029/2018ea000421 Enhanced resolution method described in: Early, D. S., Long, D. G., Feb. 2001. Image reconstruction and enhanced resolution imaging from irregular samples. IEEE Transactions on Geoscience and Remote Sensing 39 (2), 291-302. URL http://dx.doi.org/10.1109/36.905237 QSCAT melt products (2006/07-2008/09) were presented in: Luckman, A., Elvidge, A., Jansen, D., Kulessa, B., Munneke, P. K., King, J., Barrand, N. E., Dec. 2014. Surface melt and ponding on larsen c ice shelf and the impact of föhn winds. Antarct. Sci. 26 (06), 625-635. URL http://dx.doi.org/10.1017/s0954102014000339 |
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| Quality: | Melt was not defined if the winter mean backscatter was greater than -10 dB to avoid calculating melt over noisy backscatter regions such as the Peninsula mountains. ASCAT input data were only available until 21/06/2017 but we assume that this allows all melt within austral year 2016/17 to have been detected. 2 km horizontal resolution based on over sampling of 4.5 km scatterometer data. |
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| Lineage: | Enhanced Resolution scatterometer data were downloaded from the BYU Center for Remote Sensing ftp site (ftp.scp.byu.edu/pub/data/). We used the 'qmsv' QSCAT product (morning, slice, vertically polarizied) and the 'msfa' ASCAT product (all pass, vertically polarized, slice equivalent). The data were processed to identify annual melt onset, duration, and end dates. A melt day is defined when backscatter falls below the previous winter (June, July, August) mean by more than 3 dB (QSCAT), or 2.7 dB (ASCAT). Three consecutive days of melt or refreeze are required to define melt onset or end, respectively. Austral year begins August 1st and onset and end day numbers are relative to this date. Years 1999/2000 to 2008/09 are based on QSCAT data and 2009/10-2016/17 on ASCAT data. | |
| Temporal Coverage: | |
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| Start Date | 1999-01-01 |
| End Date | 2017-12-01 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -77.65 |
| Northernmost | -59.4 |
| Longitude | |
| Westernmost | -79.68 |
| Easternmost | -32.01 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | 1 km - < 10 km or approximately .01 degree - < .09 degree |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Antarctic Peninsula |
| Data Collection: |
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| Data Storage: | The dataset is approximately 22 MB and is in Geotiff format. |
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