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Pan-Arctic Land Surface Temperature from MODIS and AATSR: Product Development and Intercomparison
Interdisciplinary Centre on Climate Change (IC3), University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
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Received: 12 October 2012; in revised form: 26 November 2012 / Accepted: 27 November 2012 / Published: 5 December 2012
Abstract: Models and observations show that the Arctic is experiencing the most rapid changes in global near-surface air temperature. We developed novel EASE-grid Level 3 (L3) land surface temperature (LST) products from Level 2 (L2) AATSR and MODIS data to provide weekly, monthly and annual LST means over the pan-Arctic region at various grid resolutions (1–25 km) for the past decade (2000–2010). In this paper, we provide: (1) a review of previous validation of MODIS/AATSR L2; (2) a description of the processing chain of L3 products; (3) an assessment of the 25 km products uncertainty, and; (4) a quantification of the bias introduced by over-representing clear-sky days in MODIS L3 products. In addition, we generated uncertainty maps by comparing L3 products with LST from passive microwave sensors (AMSR-E and SSM/I) and the North American Regional Reanalysis (NARR). Results show a close correspondence between MODIS and AATSR monthly products with a mean-difference (MD) of −1.1 K. Comparing L3 products with NARR indicates a close agreement in summer and a systematic bias in winter, which is entirely negative with respect to MODIS L3 (MD: −3.6, Min: −6.8, Max: −1 K). Comparing monthly averaged MODIS L3 to NARR clear-sky to quantify over-representing clear-sky days indicates a decrease of winter and an increase of summer difference compared to NARR all-sky. Finally, we provide suggestions to improve LST retrieval over Arctic regions.
Keywords: land surface temperature; Arctic; AATSR; MODIS; passive microwave; atmospheric reanalysis
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Soliman, A.; Duguay, C.; Saunders, W.; Hachem, S. Pan-Arctic Land Surface Temperature from MODIS and AATSR: Product Development and Intercomparison. Remote Sens. 2012, 4, 3833-3856.
Soliman A, Duguay C, Saunders W, Hachem S. Pan-Arctic Land Surface Temperature from MODIS and AATSR: Product Development and Intercomparison. Remote Sensing. 2012; 4(12):3833-3856.
Soliman, Aiman; Duguay, Claude; Saunders, William; Hachem, Sonia. 2012. "Pan-Arctic Land Surface Temperature from MODIS and AATSR: Product Development and Intercomparison." Remote Sens. 4, no. 12: 3833-3856.