| タイトル | Development of a Climate-Data Record (CDR) of the Surface Temperature of the Greenland Ice Sheet |
| 本文（外部サイト） | http://hdl.handle.net/2060/20110008399 |
| 著者（英） | DiGirolamo, Nicolo E.; Stock, Larry V.; Hall, Dorthy K.; Comiso, Josefino C.; Shuman, Christopher A. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2010-04-17 |
| 言語 | eng |
| 内容記述 | Regional "clear sky" surface temperature increases since the early 1980s in the Arctic, measured using Advanced Very High Resolution Radiometer (AVHRR) infrared data, range from 0.57+/-0.02 deg C to 72+/-0.10 deg C per decade. Arctic warming has important implications for ice-sheet mass balance because much of the periphery of the Greenland Ice Sheet is already near 0 deg C during the melt season, and is thus vulnerable to rapid melting if temperatures continue to increase. An increase in melting of the ice sheet would accelerate sea-level rise, an issue affecting potentially billions of people worldwide. To quantify the ice-surface temperature (IST) of the Greenland Ice Sheet, and to provide an IST dataset of Greenland for modelers that provides uncertainties, we are developing a climate-data record (CDR) of daily "clear-sky" IST of the Greenland Ice Sheet, from 1982 to the present using AVHRR (1982 - present) and Moderate-Resolution Imaging Spectroradiometer (MODIS) data (2000 - present) at a resolution of approximately 5 km. Known issues being addressed in the production of the CDR are: time-series bias caused by cloud cover (surface temperatures can be different under clouds vs. clear areas) and cross-calibration in the overlap period between AVHRR instruments, and between AVHRR and MODIS instruments. Because of uncertainties, mainly due to clouds, time-series of satellite IST do not necessarily correspond with actual surface temperatures. The CDR will be validated by comparing results with automatic-weather station data and with satellite-derived surface-temperature products and biases will be calculated. |
| NASA分類 | Meteorology and Climatology |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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