Objective analysis of pseudostress over the Indian Ocean using a direct-minimization approach
A technique not previously used in objective analysis of meteorological data is used here to produce monthly average surface pseudostress data over the Indian Ocean. An initial guess field is derived and a cost functional is constructed with five terms: approximation to initial guess, approximation...
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| Veröffentlicht in: | Monthly weather review 1989-04, Vol.117 (4), p.709-720 |
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| creator | Legler, David M. Navon, I. M. O'Brien, James J. |
| description | A technique not previously used in objective analysis of meteorological data is used here to produce monthly average surface pseudostress data over the Indian Ocean. An initial guess field is derived and a cost functional is constructed with five terms: approximation to initial guess, approximation to climatology, a smoothness parameter, and two kinematic terms. The functional is minimized using a conjugate-gradient technique, and the weight for the climatology term controls the overall balance of influence between the climatology and the initial guess. Results from various weight combinations are presented for January and July 1984. Quantitative and qualitative comparisons to the subject analysis are made to find which weight combination provides the best results. The weight on the approximation to climatology is found to balance the influence of the original field and climatology. |
| doi_str_mv | 10.1175/1520-0493(1989)117<0709:oaopot>2.0.co;2 |
| format | Article |
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M.</au><au>O'Brien, James J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Objective analysis of pseudostress over the Indian Ocean using a direct-minimization approach</atitle><jtitle>Monthly weather review</jtitle><date>1989-04-01</date><risdate>1989</risdate><volume>117</volume><issue>4</issue><spage>709</spage><epage>720</epage><pages>709-720</pages><issn>0027-0644</issn><eissn>1520-0493</eissn><coden>MWREAB</coden><abstract>A technique not previously used in objective analysis of meteorological data is used here to produce monthly average surface pseudostress data over the Indian Ocean. An initial guess field is derived and a cost functional is constructed with five terms: approximation to initial guess, approximation to climatology, a smoothness parameter, and two kinematic terms. The functional is minimized using a conjugate-gradient technique, and the weight for the climatology term controls the overall balance of influence between the climatology and the initial guess. Results from various weight combinations are presented for January and July 1984. Quantitative and qualitative comparisons to the subject analysis are made to find which weight combination provides the best results. The weight on the approximation to climatology is found to balance the influence of the original field and climatology.</abstract><cop>Legacy CDMS</cop><pub>American Meteorological Society</pub><doi>10.1175/1520-0493(1989)117<0709:oaopot>2.0.co;2</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Monthly weather review, 1989-04, Vol.117 (4), p.709-720 |
| issn | 0027-0644 1520-0493 |
| language | eng |
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| source | American Meteorological Society; NASA Technical Reports Server; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Earth, ocean, space Exact sciences and technology External geophysics Marine Meteorology And Climatology Physics of the oceans Sea-air exchange processes |
| title | Objective analysis of pseudostress over the Indian Ocean using a direct-minimization approach |
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