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contributor authorDutta, S. K.
contributor authorGarand, L.
contributor authorHeilliette, S.
date accessioned2017-06-09T16:51:03Z
date available2017-06-09T16:51:03Z
date copyright2016/03/01
date issued2015
identifier issn1558-8424
identifier otherams-75265.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217582
description abstracthis study highlights recent progress at the Canadian Meteorological Centre in the assimilation of Atmospheric Infrared Sounder (AIRS) and Infrared Atmospheric Sounding Interferometer (IASI) radiance observations that are sensitive to land surfaces. The assimilation is carried out using the Canadian global ensemble?variational system. That system benefits from flow-dependent background-error statistics that include covariances between surface skin temperature and atmospheric variables. Up to 142 channels from both AIRS and IASI are assimilated. A detailed database of spectral surface emissivity is used. Forecasts are evaluated against ERA-Interim analyses, own-cycle analyses, and radiosonde observations. A conservative approach is taken, with restrictive conditions on topography and surface emissivity. From 2-month assimilation experiments, a significant positive impact is obtained in the Northern Hemisphere extratropics beyond day 2 from the surface to the upper troposphere. The impact is mixed in other regions, depending on level or forecast lead time. Causes for these mixed results are examined in view of future experiments and eventual operational implementation.
publisherAmerican Meteorological Society
titleAssimilation of Infrared Radiance Observations with Sensitivity to Land Surfaces in the Canadian Ensemble–Variational System
typeJournal Paper
journal volume55
journal issue3
journal titleJournal of Applied Meteorology and Climatology
identifier doi10.1175/JAMC-D-15-0208.1
journal fristpage561
journal lastpage578
treeJournal of Applied Meteorology and Climatology:;2015:;volume( 055 ):;issue: 003
contenttypeFulltext


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