Passive microwave observations of the Northeast Water polynya interannual variability: 1978-1994
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| Title: | Passive microwave observations of the Northeast Water polynya interannual variability: 1978-1994 |
|---|---|
| Authors: | Minnett, P. J., Hopkins, T. S., Bohm, E. |
| Source: | Journal of Marine Systems. Jan1997, Vol. 10 Issue 1-4, p87. 0p. |
| Subjects: | Remote sensing, Sea ice, Glaciology |
| Geographic Terms: | Greenland |
| Abstract: | A description of the seasonal cycle and interannual behavior of the Northeast Water (NEW) Polynya based upon a series of daily total ice concentrations derived from passive microwave satellite observations (1978--1994) is presented. The integrated ice-free areal extent within the region extending from 76 to 82 deg.N and from the coast of northeast Greenland to the shelf break is used as an indication of the opening of the NEW Polynya. The Polynya stays open from the beginning of May to the end of September. The summer maximum total water (TW) area ranges from a minimum 59,000 (in 1992) to a maximum of 120,000 km{sup}2{end} (in 1985) and the date of maximum opening from the beginning of July to the end of September. The largest valuer, of TW during summer are observed for 1985, 1990 and 1991 and are accompanied by the appearance of a secondary opening to the south. In contrast, the smallest TWs that occurred in 1987, 1989 and 1992, exhibit only a northern cell. Monthly averages of heat budget, cloud cover, air temperature, and resultant vector wind are analyzed in order to explain the observed variations of TW in the NEW Polynya. It is found that the variations of TW are due to the heat budget which, for the pentad March 1985--February 1990, explains 86% of the observed variance in TW with a lag of one month. This lag indicates that the response of the Polynya to the thermal forcing is not dominated by higher frequency variability. Utilizing this relationship and the TW for the summers of 1992and 1993, the potential amount of melt water was estimated assuming all the heat was available for melting. The values of 51 and 79 cm, are in good agreement with independent estimates of seasonal melting based on hydrography. The effects of wind are not easily decoupled from those of the heat budget making it difficult to establish more precisely the extent to which the Polynya may be considered a closed system. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Marine Systems is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 8202189 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Passive microwave observations of the Northeast Water polynya interannual variability: 1978-1994 – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Minnett%2C+P%2E+J%2E%22">Minnett, P. J.</searchLink><br /><searchLink fieldCode="AR" term="%22Hopkins%2C+T%2E+S%2E%22">Hopkins, T. S.</searchLink><br /><searchLink fieldCode="AR" term="%22Bohm%2C+E%2E%22">Bohm, E.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Marine+Systems%22">Journal of Marine Systems</searchLink>. Jan1997, Vol. 10 Issue 1-4, p87. 0p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Remote+sensing%22">Remote sensing</searchLink><br /><searchLink fieldCode="DE" term="%22Sea+ice%22">Sea ice</searchLink><br /><searchLink fieldCode="DE" term="%22Glaciology%22">Glaciology</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Greenland%22">Greenland</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A description of the seasonal cycle and interannual behavior of the Northeast Water (NEW) Polynya based upon a series of daily total ice concentrations derived from passive microwave satellite observations (1978--1994) is presented. The integrated ice-free areal extent within the region extending from 76 to 82 deg.N and from the coast of northeast Greenland to the shelf break is used as an indication of the opening of the NEW Polynya. The Polynya stays open from the beginning of May to the end of September. The summer maximum total water (TW) area ranges from a minimum 59,000 (in 1992) to a maximum of 120,000 km{sup}2{end} (in 1985) and the date of maximum opening from the beginning of July to the end of September. The largest valuer, of TW during summer are observed for 1985, 1990 and 1991 and are accompanied by the appearance of a secondary opening to the south. In contrast, the smallest TWs that occurred in 1987, 1989 and 1992, exhibit only a northern cell. Monthly averages of heat budget, cloud cover, air temperature, and resultant vector wind are analyzed in order to explain the observed variations of TW in the NEW Polynya. It is found that the variations of TW are due to the heat budget which, for the pentad March 1985--February 1990, explains 86% of the observed variance in TW with a lag of one month. This lag indicates that the response of the Polynya to the thermal forcing is not dominated by higher frequency variability. Utilizing this relationship and the TW for the summers of 1992and 1993, the potential amount of melt water was estimated assuming all the heat was available for melting. The values of 51 and 79 cm, are in good agreement with independent estimates of seasonal melting based on hydrography. The effects of wind are not easily decoupled from those of the heat budget making it difficult to establish more precisely the extent to which the Polynya may be considered a closed system. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Marine Systems is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 0 StartPage: 87 Subjects: – SubjectFull: Remote sensing Type: general – SubjectFull: Sea ice Type: general – SubjectFull: Glaciology Type: general – SubjectFull: Greenland Type: general Titles: – TitleFull: Passive microwave observations of the Northeast Water polynya interannual variability: 1978-1994 Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Minnett, P. J. – PersonEntity: Name: NameFull: Hopkins, T. S. – PersonEntity: Name: NameFull: Bohm, E. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan1997 Type: published Y: 1997 Identifiers: – Type: issn-print Value: 09247963 Numbering: – Type: volume Value: 10 – Type: issue Value: 1-4 Titles: – TitleFull: Journal of Marine Systems Type: main |
| ResultId | 1 |
