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File:Changes in the hydrography of Central California waters associated with the 1997-1998 El NiΣno (IA changesinhydrogr00asan).pdf

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Changes in the hydrography of Central California waters associated with the 1997-1998 El NiΣno   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Author
Asanuma, Hiromi.
image of artwork listed in title parameter on this page
Title
Changes in the hydrography of Central California waters associated with the 1997-1998 El NiΣno
Publisher
Monterey, California: Naval Postgraduate School;Springfield, Va.: Available from National Technical Information Service
Description
Thesis advisor(s): Curtis A. Collins
NPS-OC-99-01
"June 1999."
Thesis (M.S. Physical Oceanography) Naval Postgraduate School, June 1999
Includes bibliographical reference (p. 77-79)
During 1997-1998, oceanographic conditions off Central California were monitored by means of a series of thirteen cruises which measured water properties along an oceanographic section perpendicular to the California Coast. Data were analyzed by utilizing time series plots on isobaric and isopycnal surfaces and by principal component analysis. The following conditions were observed: (a) in June-July 1997, the strong poleward flow at the coast was associated with coastal (within 100 km), subsurface (200-500 dbar) warming of 0. 5 deg C and increased salinity (0.07) on isopycnal surfaces and offshore waters appeared cooler, fresher with stronger equatorward flow; (b)in September 1997, a relaxation of El Nino conditions occurred, with coastal, subsurface waters cooling by 0.3 deg C the band of poleward flow at the coast narrowed; (c) in January 1998, maximum interannual temperature and sea level anomalies were observed with nearsurface (80 dbar), nearshore (within 100 km) warming of 2.5 deg C, subsurface warming comparable to that observed in June-July 1997, and equatorward flow at the coast; and (d) in March-April 1998, coastal waters freshened greatly, both due to the onshore flow of Subarctic water and to river runoff from winter storms. By summer 1998, hydrographic conditions were near normal. The observed warming in late 1997 was not caused by decreased offshore Ekman transport but does appear to be remotely forced by poleward propagation from the Equatorial Pacific along the Eastern Boundary, possibly by Kelvin waves. The subsequent onshore transport and freshening that took place during Spring 1998 could have been related to onshore Ekman transport associated with winter storms. The observed change in heat content associated with the 1997- 1998 El Nino was the same as that observed during a normal seasonal cycle
NSF-OCE98-11035
Mode of access: World Wide Web
System requirements: Adobe Acrobat reader
dk/dk cc:9116 11/26/99
JMSDF author

Subjects:
Language en_US
Publication date 1 June 1999
publication_date QS:P577,+1999-06-01T00:00:00Z/11
Current location
IA Collections: navalpostgraduateschoollibrary; fedlink; americana
Accession number
changesinhydrogr00asan
Authority file  OCLC: 1041787669
Source
Internet Archive identifier: changesinhydrogr00asan
https://archive.org/download/changesinhydrogr00asan/changesinhydrogr00asan.pdf

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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