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Ivarsson, Karl-Ivar
Publications (5 of 5) Show all publications
Bengtsson, L., Andrae, U., Aspelien, T., Batrak, Y., Calvo, J., de Rooy, W., . . . Koltzow, M. O. (2017). The HARMONIE-AROME Model Configuration in the ALADIN-HIRLAM NWP System. Monthly Weather Review, 145(5), 1919-1935
Open this publication in new window or tab >>The HARMONIE-AROME Model Configuration in the ALADIN-HIRLAM NWP System
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2017 (English)In: Monthly Weather Review, ISSN 0027-0644, E-ISSN 1520-0493, Vol. 145, no 5, p. 1919-1935Article in journal (Refereed) Published
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-4149 (URN)10.1175/MWR-D-16-0417.1 (DOI)000404870300009 ()
Available from: 2017-08-07 Created: 2017-08-07 Last updated: 2017-08-07Bibliographically approved
Häggmark, L., Ivarsson, K.-I., Gollvik, S. & Olofsson, R. O. (2000). Mesan, an operational mesoscale analysis system. Tellus. Series A, Dynamic meteorology and oceanography, 52(1), 2-20
Open this publication in new window or tab >>Mesan, an operational mesoscale analysis system
2000 (English)In: Tellus. Series A, Dynamic meteorology and oceanography, ISSN 0280-6495, E-ISSN 1600-0870, Vol. 52, no 1, p. 2-20Article in journal (Refereed) Published
Abstract [en]

A system for mesoscale analyses of selected variables has been developed. The analysed parameters are of general interest in operational weather forecasting, but normally not available from NWP systems, or available, but with a significantly lower quality than achieved by the mesoscale analysis system. A supplementary objective is to produce initial information to be used for now-casting techniques. Examples of parameters are precipitation, temperature, humidity, visibility, wind and clouds. The basis of the analysis system is the optimal interpolation technique (OI). The use of observations from automatic stations, radars and satellites have been investigated. The investigation indicates that a dense network of ordinary precipitation gauge measurements can produce more accurate analyses than more elaborate systems like radar that suffers from anomalous echoes and other errors.

National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
urn:nbn:se:smhi:diva-1526 (URN)10.1034/j.1600-0870.2000.520102.x (DOI)000085086500002 ()
Available from: 2015-08-18 Created: 2015-08-17 Last updated: 2017-12-04Bibliographically approved
Häggmark, L., Ivarsson, K.-I. & Olofsson, P.-O. (1997). MESAN - Mesoskalig analys. SMHI
Open this publication in new window or tab >>MESAN - Mesoskalig analys
1997 (English)Report (Other academic)
Place, publisher, year, edition, pages
SMHI, 1997
Series
RMK: Report Meteorology and Climatology, ISSN 0347-2116 ; 75
Identifiers
urn:nbn:se:smhi:diva-2606 (URN)Meteorologi, Rapporter, Serie RMK (Local ID)Meteorologi, Rapporter, Serie RMK (Archive number)Meteorologi, Rapporter, Serie RMK (OAI)
Available from: 1997-05-19 Created: 2016-07-08 Last updated: 2016-07-08Bibliographically approved
Häggmark, L., Ivarsson, K.-I. & Olofsson, P.-O. (1997). MESAN Mesoskalig Analys. SMHI
Open this publication in new window or tab >>MESAN Mesoskalig Analys
1997 (English)Report (Other academic)
Abstract [en]

This report describes the work being done in developing the MESAN system for analyzing surface parameters and clouds. The following parameters are being analyzed:- 2 meter temperature,- precipitation in mm water for 1, 3, 12 and 12 hours accumulation time, and for new snow-cover in cm,- wind speed and direction and gust speed at 10 meter elevation,- visibility,- relative humidity,- total cloud cover,- amount and low clouds,- significant cloud base,- probability of observing significant cloud base,- higt of cloud top,- depth of snow cover, and- sea surface temperature.Hirlam data are normally used as first guess fields. Observatons are taken from synop, metar, Swedish climate stations, satellites, radars and automatic stations. Much work has been devoted to minimizing systematic errors in observations and investigating structure functions of first guess errors.The analys method used is optimal interpolation.

Place, publisher, year, edition, pages
SMHI, 1997. p. 77
Series
RMK: Report Meteorology and Climatology, ISSN 0347-2116 ; 75
Keywords
analysis, Sweden, surface parameters, mesoscale, optimal interpolation
Identifiers
urn:nbn:se:smhi:diva-2634 (URN)Meteorologi, Klimat, Rapporter, Serie RMK (Local ID)Meteorologi, Klimat, Rapporter, Serie RMK (Archive number)Meteorologi, Klimat, Rapporter, Serie RMK (OAI)
Available from: 1997-03-07 Created: 2016-07-08 Last updated: 2016-07-08Bibliographically approved
Ivarsson, K.-I. (1986). Resultat av byggväderprognoser - säsongen 1984/85. SMHI
Open this publication in new window or tab >>Resultat av byggväderprognoser - säsongen 1984/85
1986 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
SMHI, 1986. p. 17
Series
Meteorology, ISSN 0283-7730 ; 3
Keywords
prognos, medeltemperatur, vindriktning
Identifiers
urn:nbn:se:smhi:diva-2501 (URN)Meteorologi, Rapporter, Serie Meteorologi (Local ID)Meteorologi, Rapporter, Serie Meteorologi (Archive number)Meteorologi, Rapporter, Serie Meteorologi (OAI)
Available from: 1986-05-15 Created: 2016-07-08 Last updated: 2016-07-08Bibliographically approved
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