Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Sigurdur Thorsteinsson"'
Autor:
Sigurdur Thorsteinsson, Tomas Wilhelmsson, Ole Vignes, Magnus Lindskog, Kristian Mogensen, Xiaohua Yang, Xiang-Yu Huang, Nils Gustafsson
Publikováno v:
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 64, Iss 0, Pp 1-29 (2012)
A 4-dimensional variational data assimilation (4D-Var) scheme for the HIgh Resolution Limited Area Model (HIRLAM) forecasting system is described in this article. The innovative approaches to the multi-incremental formulation, the weak digital filter
Externí odkaz:
https://doaj.org/article/b4ede5707e924360a5642092f5acd4ea
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Pp 13983-13998 (2017)
Atmospheric moisture-related information obtained from Global Navigation Satellite System (GNSS) observations from ground-based receiver stations of the Nordic GNSS Analysis Centre (NGAA) have been used within a state-of-the-art km-scale numerical we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff32087bebdc0d1fd57da859cb42a16a
http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-4450
http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-4450
Publikováno v:
ARCIMIS. Archivo Climatológico y Meteorológico Institucional (AEMET)
Agencia Estatal de Meteorología (AEMET)
Agencia Estatal de Meteorología (AEMET)
To fill the gap in the observation system for humidity, the HIRLAM–ALADIN Research on Mesoscale Operational NWP in Euromed (HARMONIE) limited-area high-resolution kilometer-scale model has been prepared for assimilation of Global Navigation Satelli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64b0b847d914ed0277223f337463a8d3
http://hdl.handle.net/20.500.11765/2547
http://hdl.handle.net/20.500.11765/2547
Autor:
Kristian S. Mogensen, Ole Vignes, Nils Gustafsson, Xiaohua Yang, Xiang-Yu Huang, Sigurdur Thorsteinsson, Tomas Wilhelmsson, Magnus Lindskog
Publikováno v:
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 64, Iss 0, Pp 1-29 (2012)
Tellus A; Vol 64 (2012)
Tellus A; Vol 64 (2012)
A 4-dimensional variational data assimilation (4D-Var) scheme for the HIgh Resolution Limited Area Model (HIRLAM) forecasting system is described in this article. The innovative approaches to the multi-incremental formulation, the weak digital filter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e678ddff8636d46341f027c43311119
http://www.tellusa.net/index.php/tellusa/article/view/14985/pdf_1
http://www.tellusa.net/index.php/tellusa/article/view/14985/pdf_1
Publikováno v:
Quarterly Journal of the Royal Meteorological Society. 137:1773-1789
We present a numerical study of a polar low which hit western Iceland in January 2007, with heavy snowfall and mean wind speeds exceeding 20 m s−1 in several locations. The operational models at the time captured the polar low formation rather well
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4cfaf478487518bb1625673f9026fe49
https://doi.org/10.1002/qj.831
https://doi.org/10.1002/qj.831
Publikováno v:
Quarterly Journal of the Royal Meteorological Society. 137:1004-1018
We present a reformulation of the humidity part of the HIRLAM (HIgh-Resolution Limited-Area Model) variational data assimilation. The purpose is to rectify some of the shortcomings of the present formulation which uses specific humidity, q, as an ass
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a915c02cec6b0afb734b2db31666aea
https://doi.org/10.1002/qj.813
https://doi.org/10.1002/qj.813
Autor:
Nils Gustafsson, Xiang-Yu Huang, Sigurdur Thorsteinsson, Beatriz Navascues, Kristian S. Mogensen, Loïk Berre, Magnus Lindskog, Sara Hörnquist
Publikováno v:
Tellus A. 53:425-446
A 3-dimensional variational data assimilation (3D-Var) scheme for the HIgh Resolution Limited Area Model (HIRLAM) forecasting system is described. The HIRLAM 3D-Var is based on the minimization of a cost function that consists of one term J(b). which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb490b7ec133f5da4d2594edb1b674ae
https://doi.org/10.1111/j.1600-0870.2001.00425.x
https://doi.org/10.1111/j.1600-0870.2001.00425.x
Autor:
Gudmundur F. Ulfarsson, Vidar Erlingsson, Jón Egill Kristjánsson, Sigurdur Thorsteinsson, Bjørn Røsting
Publikováno v:
Monthly Weather Review. 127:1072-1088
The evolution of a deep North Atlantic cyclone, which caused devastating avalanches in northwest (NW) Iceland in October 1995, was investigated. As the main tool for this investigation, potential vorticity analysis was used. This allows the quantific
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aaa1f92f512507697d29c3158a659ff9
https://doi.org/10.1175/1520-0493(1999)127<1072:adsotf>2.0.co
https://doi.org/10.1175/1520-0493(1999)127<1072:adsotf>2.0.co
Publikováno v:
Tellus A. 51:233-248
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::836ec28ed997286f3a7610bc6d6c4d57
https://doi.org/10.1034/j.1600-0870.1999.t01-2-00005.x
https://doi.org/10.1034/j.1600-0870.1999.t01-2-00005.x
Publikováno v:
Tellus A; Vol 47, No 5 (1995)
In the first study of a series of studies of intense cyclones in the active region around Iceland, the explosive synoptic-scale “Greenhouse Low” that hit Iceland on 3 February 1991 is studied. We have investigated this cyclone mainly through nume
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4d16e40aeca669d6bbb2c6ee35fa6ca
https://doi.org/10.1034/j.1600-0870.1995.00111.x
https://doi.org/10.1034/j.1600-0870.1995.00111.x